// You can set the following variables before loading this script:
//
// var netdataNoDygraphs = true;		// do not use dygraph
// var netdataNoSparklines = true;		// do not use sparkline
// var netdataNoPeitys = true;			// do not use peity
// var netdataNoGoogleCharts = true;	// do not use google
// var netdataNoMorris = true;			// do not use morris
// var netdataNoEasyPieChart = true;	// do not use easy pie chart
// var netdataNoGauge = true;			// do not use gauge.js
// var netdataNoD3 = true;				// do not use D3
// var netdataNoC3 = true;				// do not use C3
// var netdataNoBootstrap = true;		// do not load bootstrap
// var netdataDontStart = true;			// do not start the thread to process the charts
// var netdataErrorCallback = null;		// Callback function that will be invoked upon error
// var netdataNoRegistry = true;		// Don't update the registry for this access
// var netdataRegistryCallback = null;	// Callback function that will be invoked with one param,
//                                         the URLs from the registry
//
// You can also set the default netdata server, using the following.
// When this variable is not set, we assume the page is hosted on your
// netdata server already.
// var netdataServer = "http://yourhost:19999"; // set your NetData server

//(function(window, document, undefined) {

	// ------------------------------------------------------------------------
	// compatibility fixes

	// fix IE issue with console
	if(!window.console) { window.console = { log: function(){} }; }

	// if string.endsWith is not defined, define it
	if(typeof String.prototype.endsWith !== 'function') {
		String.prototype.endsWith = function(s) {
			if(s.length > this.length) return false;
			return this.slice(-s.length) === s;
		};
	}

	// if string.startsWith is not defined, define it
	if(typeof String.prototype.startsWith !== 'function') {
		String.prototype.startsWith = function(s) {
			if(s.length > this.length) return false;
			return this.slice(s.length) === s;
		};
	}

	// global namespace
	var NETDATA = window.NETDATA || {};

	// ----------------------------------------------------------------------------------------------------------------
	// Detect the netdata server

	// http://stackoverflow.com/questions/984510/what-is-my-script-src-url
	// http://stackoverflow.com/questions/6941533/get-protocol-domain-and-port-from-url
	NETDATA._scriptSource = function() {
		var script = null;

		if(typeof document.currentScript !== 'undefined') {
			script = document.currentScript;
		}
		else {
			var all_scripts = document.getElementsByTagName('script');
			script = all_scripts[all_scripts.length - 1];
		}

		if (typeof script.getAttribute.length !== 'undefined')
			script = script.src;
		else
			script = script.getAttribute('src', -1);

		return script;
	};

	if(typeof netdataServer !== 'undefined')
		NETDATA.serverDefault = netdataServer;
	else {
		var s = NETDATA._scriptSource();
		if(s) NETDATA.serverDefault = s.replace(/\/dashboard.js(\?.*)*$/g, "");
		else {
			console.log('WARNING: Cannot detect the URL of the netdata server.');
			NETDATA.serverDefault = null;
		}
	}

	if(NETDATA.serverDefault === null)
		NETDATA.serverDefault = '';
	else if(NETDATA.serverDefault.slice(-1) !== '/')
		NETDATA.serverDefault += '/';

	// default URLs for all the external files we need
	// make them RELATIVE so that the whole thing can also be
	// installed under a web server
	NETDATA.jQuery       		= NETDATA.serverDefault + 'lib/jquery-1.12.0.min.js';
	NETDATA.peity_js     		= NETDATA.serverDefault + 'lib/jquery.peity.min.js';
	NETDATA.sparkline_js 		= NETDATA.serverDefault + 'lib/jquery.sparkline.min.js';
	NETDATA.easypiechart_js 	= NETDATA.serverDefault + 'lib/jquery.easypiechart.min.js';
	NETDATA.gauge_js 			= NETDATA.serverDefault + 'lib/gauge.min.js';
	NETDATA.dygraph_js   		= NETDATA.serverDefault + 'lib/dygraph-combined.js';
	NETDATA.dygraph_smooth_js   = NETDATA.serverDefault + 'lib/dygraph-smooth-plotter.js';
	NETDATA.raphael_js   		= NETDATA.serverDefault + 'lib/raphael-min.js';
	NETDATA.morris_js    		= NETDATA.serverDefault + 'lib/morris.min.js';
	NETDATA.d3_js  		  		= NETDATA.serverDefault + 'lib/d3.min.js';
	NETDATA.c3_js  		  		= NETDATA.serverDefault + 'lib/c3.min.js';
	NETDATA.c3_css   			= NETDATA.serverDefault + 'css/c3.min.css';
	NETDATA.morris_css   		= NETDATA.serverDefault + 'css/morris.css';
	NETDATA.google_js    		= 'https://www.google.com/jsapi';

	NETDATA.themes = {
		white: {
			bootstrap_css: NETDATA.serverDefault + 'css/bootstrap.min.css',
			dashboard_css: NETDATA.serverDefault + 'dashboard.css',
			background: '#FFFFFF',
			foreground: '#000000',
			grid: '#DDDDDD',
			axis: '#CCCCCC',
			colors: [ 	'#3366CC', '#DC3912',   '#109618', '#FF9900',   '#990099', '#DD4477',
						'#3B3EAC', '#66AA00',   '#0099C6', '#B82E2E',   '#AAAA11', '#5574A6',
						'#994499', '#22AA99',   '#6633CC', '#E67300',   '#316395', '#8B0707',
						'#329262', '#3B3EAC' ],
			easypiechart_track: '#f0f0f0',
			easypiechart_scale: '#dfe0e0',
			gauge_pointer: '#C0C0C0',
			gauge_stroke: '#F0F0F0',
			gauge_gradient: false
		},
		slate: {
			bootstrap_css: NETDATA.serverDefault + 'css/bootstrap.slate.min.css',
			dashboard_css: NETDATA.serverDefault + 'dashboard.slate.css',
			background: '#272b30',
			foreground: '#C8C8C8',
			grid: '#373b40',
			axis: '#373b40',
/*			colors: [ 	'#55bb33', '#ff2222',   '#0099C6', '#faa11b',   '#adbce0', '#DDDD00',
						'#4178ba', '#f58122',   '#a5cc39', '#f58667',   '#f5ef89', '#cf93c0',
						'#a5d18a', '#b8539d',   '#3954a3', '#c8a9cf',   '#c7de8a', '#fad20a',
						'#a6a479', '#a66da8' ],
*/
			colors: [ 	'#66AA00', '#FE3912',   '#3366CC', '#D66300',   '#0099C6', '#DDDD00',
						'#3B3EAC', '#EE9911',   '#BB44CC', '#C83E3E',   '#990099', '#CC7700',
						'#22AA99', '#109618',   '#6633CC', '#DD4477',   '#316395', '#8B0707',
						'#329262', '#3B3EFF' ],
			easypiechart_track: '#373b40',
			easypiechart_scale: '#373b40',
			gauge_pointer: '#474b50',
			gauge_stroke: '#373b40',
			gauge_gradient: false
		}
	};

	if(typeof netdataTheme !== 'undefined' && typeof NETDATA.themes[netdataTheme] !== 'undefined')
		NETDATA.themes.current = NETDATA.themes[netdataTheme];
	else
		NETDATA.themes.current = NETDATA.themes.white;

	NETDATA.colors = NETDATA.themes.current.colors;

	// these are the colors Google Charts are using
	// we have them here to attempt emulate their look and feel on the other chart libraries
	// http://there4.io/2012/05/02/google-chart-color-list/
	//NETDATA.colors		= [ '#3366CC', '#DC3912', '#FF9900', '#109618', '#990099', '#3B3EAC', '#0099C6',
	//						'#DD4477', '#66AA00', '#B82E2E', '#316395', '#994499', '#22AA99', '#AAAA11',
	//						'#6633CC', '#E67300', '#8B0707', '#329262', '#5574A6', '#3B3EAC' ];

	// an alternative set
	// http://www.mulinblog.com/a-color-palette-optimized-for-data-visualization/
	//                         (blue)     (red)      (orange)   (green)    (pink)     (brown)    (purple)   (yellow)   (gray)
	//NETDATA.colors 		= [ '#5DA5DA', '#F15854', '#FAA43A', '#60BD68', '#F17CB0', '#B2912F', '#B276B2', '#DECF3F', '#4D4D4D' ];

	// ----------------------------------------------------------------------------------------------------------------
	// the defaults for all charts

	// if the user does not specify any of these, the following will be used

	NETDATA.chartDefaults = {
		host: NETDATA.serverDefault,	// the server to get data from
		width: '100%',					// the chart width - can be null
		height: '100%',					// the chart height - can be null
		min_width: null,				// the chart minimum width - can be null
		library: 'dygraph',				// the graphing library to use
		method: 'average',				// the grouping method
		before: 0,						// panning
		after: -600,					// panning
		pixels_per_point: 1,			// the detail of the chart
		fill_luminance: 0.8				// luminance of colors in solit areas
	};

	// ----------------------------------------------------------------------------------------------------------------
	// global options

	NETDATA.options = {
		pauseCallback: null,			// a callback when we are really paused

		pause: false,					// when enabled we don't auto-refresh the charts

		targets: null,					// an array of all the state objects that are
										// currently active (independently of their
										// viewport visibility)

		updated_dom: true,				// when true, the DOM has been updated with
										// new elements we have to check.

		auto_refresher_fast_weight: 0,	// this is the current time in ms, spent
										// rendering charts continiously.
										// used with .current.fast_render_timeframe

		page_is_visible: true,			// when true, this page is visible

		auto_refresher_stop_until: 0,	// timestamp in ms - used internaly, to stop the
										// auto-refresher for some time (when a chart is
										// performing pan or zoom, we need to stop refreshing
										// all other charts, to have the maximum speed for
										// rendering the chart that is panned or zoomed).
										// Used with .current.global_pan_sync_time

		last_resized: new Date().getTime(), // the timestamp of the last resize request

		last_page_scroll: 0,			// the timestamp the last time the page was scrolled

		// the current profile
		// we may have many...
		current: {
			pixels_per_point: 1,		// the minimum pixels per point for all charts
										// increase this to speed javascript up
										// each chart library has its own limit too
										// the max of this and the chart library is used
										// the final is calculated every time, so a change
										// here will have immediate effect on the next chart
										// update

			idle_between_charts: 100,	// ms - how much time to wait between chart updates

			fast_render_timeframe: 200, // ms - render continously until this time of continious
										// rendering has been reached
										// this setting is used to make it render e.g. 10
										// charts at once, sleep idle_between_charts time
										// and continue for another 10 charts.

			idle_between_loops: 500,	// ms - if all charts have been updated, wait this
										// time before starting again.

			idle_parallel_loops: 100,	// ms - the time between parallel refresher updates

			idle_lost_focus: 500,		// ms - when the window does not have focus, check
										// if focus has been regained, every this time

			global_pan_sync_time: 1000,	// ms - when you pan or zoon a chart, the background
										// autorefreshing of charts is paused for this amount
										// of time

			sync_selection_delay: 1500,	// ms - when you pan or zoom a chart, wait this amount
										// of time before setting up synchronized selections
										// on hover.

			sync_selection: true,		// enable or disable selection sync

			pan_and_zoom_delay: 50,		// when panning or zooming, how ofter to update the chart

			sync_pan_and_zoom: true,	// enable or disable pan and zoom sync

			pan_and_zoom_data_padding: true, // fetch more data for the master chart when panning or zooming

			update_only_visible: true,	// enable or disable visibility management

			parallel_refresher: true,	// enable parallel refresh of charts

			concurrent_refreshes: true,	// when parallel_refresher is enabled, sync also the charts

			destroy_on_hide: false,		// destroy charts when they are not visible

			show_help: true,			// when enabled the charts will show some help
			show_help_delay_show_ms: 500,
			show_help_delay_hide_ms: 0,

			eliminate_zero_dimensions: true, // do not show dimensions with just zeros

			stop_updates_when_focus_is_lost: true, // boolean - shall we stop auto-refreshes when document does not have user focus
			stop_updates_while_resizing: 1000,	// ms - time to stop auto-refreshes while resizing the charts

			double_click_speed: 500,	// ms - time between clicks / taps to detect double click/tap

 			smooth_plot: true,			// enable smooth plot, where possible

			charts_selection_animation_delay: 50, // delay to animate charts when syncing selection

 			color_fill_opacity_line: 1.0,
 			color_fill_opacity_area: 0.2,
			color_fill_opacity_stacked: 0.8,

			pan_and_zoom_factor: 0.25,		// the increment when panning and zooming with the toolbox
			pan_and_zoom_factor_multiplier_control: 2.0,
			pan_and_zoom_factor_multiplier_shift: 3.0,
			pan_and_zoom_factor_multiplier_alt: 4.0,

			setOptionCallback: function() { ; }
		},

		debug: {
			show_boxes: 		false,
			main_loop: 			false,
			focus: 				false,
			visibility: 		false,
			chart_data_url: 	false,
			chart_errors: 		false, // FIXME
			chart_timing: 		false,
			chart_calls: 		false,
			libraries: 			false,
			dygraph: 			false
		}
	};

	NETDATA.statistics = {
		refreshes_total: 0,
		refreshes_active: 0,
		refreshes_active_max: 0
	};


	// ----------------------------------------------------------------------------------------------------------------
	// local storage options

	NETDATA.localStorage = {
		default: {},
		current: {},
		callback: {} // only used for resetting back to defaults
	};

	NETDATA.localStorageGet = function(key, def, callback) {
		var ret = def;

		if(typeof NETDATA.localStorage.default[key.toString()] === 'undefined') {
			NETDATA.localStorage.default[key.toString()] = def;
			NETDATA.localStorage.callback[key.toString()] = callback;
		}

		if(typeof Storage !== "undefined" && typeof localStorage === 'object') {
			try {
				// console.log('localStorage: loading "' + key.toString() + '"');
				ret = localStorage.getItem(key.toString());
				if(ret === null || ret === 'undefined') {
					// console.log('localStorage: cannot load it, saving "' + key.toString() + '" with value "' + JSON.stringify(def) + '"');
					localStorage.setItem(key.toString(), JSON.stringify(def));
					ret = def;
				}
				else {
					// console.log('localStorage: got "' + key.toString() + '" with value "' + ret + '"');
					ret = JSON.parse(ret);
					// console.log('localStorage: loaded "' + key.toString() + '" as value ' + ret + ' of type ' + typeof(ret));
				}
			}
			catch(error) {
				console.log('localStorage: failed to read "' + key.toString() + '", using default: "' + def.toString() + '"');
				ret = def;
			}
		}

		if(typeof ret === 'undefined' || ret === 'undefined') {
			console.log('localStorage: LOADED UNDEFINED "' + key.toString() + '" as value ' + ret + ' of type ' + typeof(ret));
			ret = def;
		}

		NETDATA.localStorage.current[key.toString()] = ret;
		return ret;
	};

	NETDATA.localStorageSet = function(key, value, callback) {
		if(typeof value === 'undefined' || value === 'undefined') {
			console.log('localStorage: ATTEMPT TO SET UNDEFINED "' + key.toString() + '" as value ' + value + ' of type ' + typeof(value));
		}

		if(typeof NETDATA.localStorage.default[key.toString()] === 'undefined') {
			NETDATA.localStorage.default[key.toString()] = value;
			NETDATA.localStorage.current[key.toString()] = value;
			NETDATA.localStorage.callback[key.toString()] = callback;
		}

		if(typeof Storage !== "undefined" && typeof localStorage === 'object') {
			// console.log('localStorage: saving "' + key.toString() + '" with value "' + JSON.stringify(value) + '"');
			try {
				localStorage.setItem(key.toString(), JSON.stringify(value));
			}
			catch(e) {
				console.log('localStorage: failed to save "' + key.toString() + '" with value: "' + value.toString() + '"');
			}
		}

		NETDATA.localStorage.current[key.toString()] = value;
		return value;
	};

	NETDATA.localStorageGetRecursive = function(obj, prefix, callback) {
		for(var i in obj) {
			if(typeof obj[i] === 'object') {
				//console.log('object ' + prefix + '.' + i.toString());
				NETDATA.localStorageGetRecursive(obj[i], prefix + '.' + i.toString(), callback);
				continue;
			}

			obj[i] = NETDATA.localStorageGet(prefix + '.' + i.toString(), obj[i], callback);
		}
	};

	NETDATA.setOption = function(key, value) {
		if(key.toString() === 'setOptionCallback') {
			if(typeof NETDATA.options.current.setOptionCallback === 'function') {
				NETDATA.options.current[key.toString()] = value;
				NETDATA.options.current.setOptionCallback();
			}
		}
		else if(NETDATA.options.current[key.toString()] !== value) {
			var name = 'options.' + key.toString();

			if(typeof NETDATA.localStorage.default[name.toString()] === 'undefined')
				console.log('localStorage: setOption() on unsaved option: "' + name.toString() + '", value: ' + value);

			//console.log(NETDATA.localStorage);
			//console.log('setOption: setting "' + key.toString() + '" to "' + value + '" of type ' + typeof(value) + ' original type ' + typeof(NETDATA.options.current[key.toString()]));
			//console.log(NETDATA.options);
			NETDATA.options.current[key.toString()] = NETDATA.localStorageSet(name.toString(), value, null);

			if(typeof NETDATA.options.current.setOptionCallback === 'function')
				NETDATA.options.current.setOptionCallback();
		}

		return true;
	};

	NETDATA.getOption = function(key) {
		return NETDATA.options.current[key.toString()];
	};

	// read settings from local storage
	NETDATA.localStorageGetRecursive(NETDATA.options.current, 'options', null);

	// always start with this option enabled.
	NETDATA.setOption('stop_updates_when_focus_is_lost', true);

	NETDATA.resetOptions = function() {
		for(var i in NETDATA.localStorage.default) {
			var a = i.split('.');

			if(a[0] === 'options') {
				if(a[1] === 'setOptionCallback') continue;
				if(typeof NETDATA.localStorage.default[i] === 'undefined') continue;
				if(NETDATA.options.current[i] === NETDATA.localStorage.default[i]) continue;

				NETDATA.setOption(a[1], NETDATA.localStorage.default[i]);
			}
			else if(a[0] === 'chart_heights') {
				if(typeof NETDATA.localStorage.callback[i] === 'function' && typeof NETDATA.localStorage.default[i] !== 'undefined') {
					NETDATA.localStorage.callback[i](NETDATA.localStorage.default[i]);
				}
			}
		}
	}

	// ----------------------------------------------------------------------------------------------------------------

	if(NETDATA.options.debug.main_loop === true)
		console.log('welcome to NETDATA');

	NETDATA.onresize = function() {
		NETDATA.options.last_resized = new Date().getTime();
		NETDATA.onscroll();
	};

	NETDATA.onscroll = function() {
		// console.log('onscroll');

		NETDATA.options.last_page_scroll = new Date().getTime();
		if(NETDATA.options.targets === null) return;

		// when the user scrolls he sees that we have
		// hidden all the not-visible charts
		// using this little function we try to switch
		// the charts back to visible quickly
		var targets = NETDATA.options.targets;
		var len = targets.length;
		while(len--) targets[len].isVisible();
	};

	window.onresize = NETDATA.onresize;
	window.onscroll = NETDATA.onscroll;

	// ----------------------------------------------------------------------------------------------------------------
	// Error Handling

	NETDATA.errorCodes = {
		100: { message: "Cannot load chart library", alert: true },
		101: { message: "Cannot load jQuery", alert: true },
		402: { message: "Chart library not found", alert: false },
		403: { message: "Chart library not enabled/is failed", alert: false },
		404: { message: "Chart not found", alert: false },
		405: { message: "Cannot download charts index from server", alert: true },
		406: { message: "Invalid charts index downloaded from server", alert: true },
		407: { message: "Cannot HELLO netdata server", alert: false },
		408: { message: "Netdata servers sent invalid response to HELLO", alert: false },
		409: { message: "Cannot ACCESS netdata registry", alert: false },
		410: { message: "Netdata registry ACCESS failed", alert: false },
		411: { message: "Netdata registry server send invalid response to DELETE ", alert: false },
		412: { message: "Netdata registry DELETE failed", alert: false },
		413: { message: "Netdata registry server send invalid response to SWITCH ", alert: false },
		414: { message: "Netdata registry SWITCH failed", alert: false }
	};
	NETDATA.errorLast = {
		code: 0,
		message: "",
		datetime: 0
	};

	NETDATA.error = function(code, msg) {
		NETDATA.errorLast.code = code;
		NETDATA.errorLast.message = msg;
		NETDATA.errorLast.datetime = new Date().getTime();

		console.log("ERROR " + code + ": " + NETDATA.errorCodes[code].message + ": " + msg);

		var ret = true;
		if(typeof netdataErrorCallback === 'function') {
		   ret = netdataErrorCallback('system', code, msg);
		}

		if(ret && NETDATA.errorCodes[code].alert)
			alert("ERROR " + code + ": " + NETDATA.errorCodes[code].message + ": " + msg);
	};

	NETDATA.errorReset = function() {
		NETDATA.errorLast.code = 0;
		NETDATA.errorLast.message = "You are doing fine!";
		NETDATA.errorLast.datetime = 0;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Chart Registry

	// When multiple charts need the same chart, we avoid downloading it
	// multiple times (and having it in browser memory multiple time)
	// by using this registry.

	// Every time we download a chart definition, we save it here with .add()
	// Then we try to get it back with .get(). If that fails, we download it.

	NETDATA.chartRegistry = {
		charts: {},

		fixid: function(id) {
			return id.replace(/:/g, "_").replace(/\//g, "_");
		},

		add: function(host, id, data) {
			host = this.fixid(host);
			id   = this.fixid(id);

			if(typeof this.charts[host] === 'undefined')
				this.charts[host] = {};

			//console.log('added ' + host + '/' + id);
			this.charts[host][id] = data;
		},

		get: function(host, id) {
			host = this.fixid(host);
			id   = this.fixid(id);

			if(typeof this.charts[host] === 'undefined')
				return null;

			if(typeof this.charts[host][id] === 'undefined')
				return null;

			//console.log('cached ' + host + '/' + id);
			return this.charts[host][id];
		},

		downloadAll: function(host, callback) {
			while(host.slice(-1) === '/')
				host = host.substring(0, host.length - 1);

			var self = this;

			$.ajax({
				url: host + '/api/v1/charts',
				async: true,
				cache: false
			})
			.done(function(data) {
				if(data !== null) {
					var h = NETDATA.chartRegistry.fixid(host);
					self.charts[h] = data.charts;
				}
				else NETDATA.error(406, host + '/api/v1/charts');

				if(typeof callback === 'function')
					callback(data);
			})
			.fail(function() {
				NETDATA.error(405, host + '/api/v1/charts');

				if(typeof callback === 'function')
					callback(null);
			});
		}
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Global Pan and Zoom on charts

	// Using this structure are synchronize all the charts, so that
	// when you pan or zoom one, all others are automatically refreshed
	// to the same timespan.

	NETDATA.globalPanAndZoom = {
		seq: 0,					// timestamp ms
								// every time a chart is panned or zoomed
								// we set the timestamp here
								// then we use it as a sequence number
								// to find if other charts are syncronized
								// to this timerange

		master: null,			// the master chart (state), to which all others
								// are synchronized

		force_before_ms: null,	// the timespan to sync all other charts
		force_after_ms: null,

		// set a new master
		setMaster: function(state, after, before) {
			if(NETDATA.options.current.sync_pan_and_zoom === false)
				return;

			if(this.master !== null && this.master !== state)
				this.master.resetChart(true, true);

			var now = new Date().getTime();
			this.master = state;
			this.seq = now;
			this.force_after_ms = after;
			this.force_before_ms = before;
			NETDATA.options.auto_refresher_stop_until = now + NETDATA.options.current.global_pan_sync_time;
		},

		// clear the master
		clearMaster: function() {
			if(this.master !== null) {
				var st = this.master;
				this.master = null;
				st.resetChart();
			}

			this.master = null;
			this.seq = 0;
			this.force_after_ms = null;
			this.force_before_ms = null;
			NETDATA.options.auto_refresher_stop_until = 0;
		},

		// is the given state the master of the global
		// pan and zoom sync?
		isMaster: function(state) {
			if(this.master === state) return true;
			return false;
		},

		// are we currently have a global pan and zoom sync?
		isActive: function() {
			if(this.master !== null && this.force_before_ms !== null && this.force_after_ms !== null && this.seq !== 0) return true;
			return false;
		},

		// check if a chart, other than the master
		// needs to be refreshed, due to the global pan and zoom
		shouldBeAutoRefreshed: function(state) {
			if(this.master === null || this.seq === 0)
				return false;

			//if(state.needsRecreation())
			//	return true;

			if(state.tm.pan_and_zoom_seq === this.seq)
				return false;

			return true;
		}
	};

	// ----------------------------------------------------------------------------------------------------------------
	// dimensions selection

	// FIXME
	// move color assignment to dimensions, here

	dimensionStatus = function(parent, label, name_div, value_div, color) {
		this.enabled = false;
		this.parent = parent;
		this.label = label;
		this.name_div = null;
		this.value_div = null;
		this.color = NETDATA.themes.current.foreground;

		if(parent.selected_count > parent.unselected_count)
			this.selected = true;
		else
			this.selected = false;

		this.setOptions(name_div, value_div, color);
	};

	dimensionStatus.prototype.invalidate = function() {
		this.name_div = null;
		this.value_div = null;
		this.enabled = false;
	};

	dimensionStatus.prototype.setOptions = function(name_div, value_div, color) {
		this.color = color;

		if(this.name_div != name_div) {
			this.name_div = name_div;
			this.name_div.title = this.label;
			this.name_div.style.color = this.color;
			if(this.selected === false)
				this.name_div.className = 'netdata-legend-name not-selected';
			else
				this.name_div.className = 'netdata-legend-name selected';
		}

		if(this.value_div != value_div) {
			this.value_div = value_div;
			this.value_div.title = this.label;
			this.value_div.style.color = this.color;
			if(this.selected === false)
				this.value_div.className = 'netdata-legend-value not-selected';
			else
				this.value_div.className = 'netdata-legend-value selected';
		}

		this.enabled = true;
		this.setHandler();
	};

	dimensionStatus.prototype.setHandler = function() {
		if(this.enabled === false) return;

		var ds = this;

		// this.name_div.onmousedown = this.value_div.onmousedown = function(e) {
		this.name_div.onclick = this.value_div.onclick = function(e) {
			e.preventDefault();
			if(ds.isSelected()) {
				// this is selected
				if(e.shiftKey === true || e.ctrlKey === true) {
					// control or shift key is pressed -> unselect this (except is none will remain selected, in which case select all)
					ds.unselect();

					if(ds.parent.countSelected() === 0)
						ds.parent.selectAll();
				}
				else {
					// no key is pressed -> select only this (except if it is the only selected already, in which case select all)
					if(ds.parent.countSelected() === 1) {
						ds.parent.selectAll();
					}
					else {
						ds.parent.selectNone();
						ds.select();
					}
				}
			}
			else {
				// this is not selected
				if(e.shiftKey === true || e.ctrlKey === true) {
					// control or shift key is pressed -> select this too
					ds.select();
				}
				else {
					// no key is pressed -> select only this
					ds.parent.selectNone();
					ds.select();
				}
			}

			ds.parent.state.redrawChart();
		}
	};

	dimensionStatus.prototype.select = function() {
		if(this.enabled === false) return;

		this.name_div.className = 'netdata-legend-name selected';
		this.value_div.className = 'netdata-legend-value selected';
		this.selected = true;
	};

	dimensionStatus.prototype.unselect = function() {
		if(this.enabled === false) return;

		this.name_div.className = 'netdata-legend-name not-selected';
		this.value_div.className = 'netdata-legend-value hidden';
		this.selected = false;
	};

	dimensionStatus.prototype.isSelected = function() {
		return(this.enabled === true && this.selected === true);
	};

	// ----------------------------------------------------------------------------------------------------------------

	dimensionsVisibility = function(state) {
		this.state = state;
		this.len = 0;
		this.dimensions = {};
		this.selected_count = 0;
		this.unselected_count = 0;
	};

	dimensionsVisibility.prototype.dimensionAdd = function(label, name_div, value_div, color) {
		if(typeof this.dimensions[label] === 'undefined') {
			this.len++;
			this.dimensions[label] = new dimensionStatus(this, label, name_div, value_div, color);
		}
		else
			this.dimensions[label].setOptions(name_div, value_div, color);

		return this.dimensions[label];
	};

	dimensionsVisibility.prototype.dimensionGet = function(label) {
		return this.dimensions[label];
	};

	dimensionsVisibility.prototype.invalidateAll = function() {
		for(var d in this.dimensions)
			this.dimensions[d].invalidate();
	};

	dimensionsVisibility.prototype.selectAll = function() {
		for(var d in this.dimensions)
			this.dimensions[d].select();
	};

	dimensionsVisibility.prototype.countSelected = function() {
		var i = 0;
		for(var d in this.dimensions)
			if(this.dimensions[d].isSelected()) i++;

		return i;
	};

	dimensionsVisibility.prototype.selectNone = function() {
		for(var d in this.dimensions)
			this.dimensions[d].unselect();
	};

	dimensionsVisibility.prototype.selected2BooleanArray = function(array) {
		var ret = new Array();
		this.selected_count = 0;
		this.unselected_count = 0;

		for(var i = 0, len = array.length; i < len ; i++) {
			var ds = this.dimensions[array[i]];
			if(typeof ds === 'undefined') {
				// console.log(array[i] + ' is not found');
				ret.push(false);
				continue;
			}

			if(ds.isSelected()) {
				ret.push(true);
				this.selected_count++;
			}
			else {
				ret.push(false);
				this.unselected_count++;
			}
		}

		if(this.selected_count === 0 && this.unselected_count !== 0) {
			this.selectAll();
			return this.selected2BooleanArray(array);
		}

		return ret;
	};


	// ----------------------------------------------------------------------------------------------------------------
	// global selection sync

	NETDATA.globalSelectionSync = {
		state: null,
		dont_sync_before: 0,
		last_t: 0,
		slaves: [],

		stop: function() {
			if(this.state !== null)
				this.state.globalSelectionSyncStop();
		},

		delay: function() {
			if(this.state !== null) {
				this.state.globalSelectionSyncDelay();
			}
		}
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Our state object, where all per-chart values are stored

	chartState = function(element) {
		var self = $(element);
		this.element = element;

		// IMPORTANT:
		// all private functions should use 'that', instead of 'this'
		var that = this;

		/* error() - private
		 * show an error instead of the chart
		 */
		var error = function(msg) {
			var ret = true;

			if(typeof netdataErrorCallback === 'function') {
				ret = netdataErrorCallback('chart', that.id, msg);
			}

			if(ret) {
				that.element.innerHTML = that.id + ': ' + msg;
				that.enabled = false;
				that.current = that.pan;
			}
		};

		// GUID - a unique identifier for the chart
		this.uuid = NETDATA.guid();

		// string - the name of chart
		this.id = self.data('netdata');

		// string - the key for localStorage settings
		this.settings_id = self.data('id') || null;

		// the user given dimensions of the element
		this.width = self.data('width') || NETDATA.chartDefaults.width;
		this.height = self.data('height') || NETDATA.chartDefaults.height;

		if(this.settings_id !== null) {
			this.height = NETDATA.localStorageGet('chart_heights.' + this.settings_id, this.height, function(height) {
				// this is the callback that will be called
				// if and when the user resets all localStorage variables
				// to their defaults

				resizeChartToHeight(height);
			});
		}

		// string - the netdata server URL, without any path
		this.host = self.data('host') || NETDATA.chartDefaults.host;

		// make sure the host does not end with /
		// all netdata API requests use absolute paths
		while(this.host.slice(-1) === '/')
			this.host = this.host.substring(0, this.host.length - 1);

		// string - the grouping method requested by the user
		this.method = self.data('method') || NETDATA.chartDefaults.method;

		// the time-range requested by the user
		this.after = self.data('after') || NETDATA.chartDefaults.after;
		this.before = self.data('before') || NETDATA.chartDefaults.before;

		// the pixels per point requested by the user
		this.pixels_per_point = self.data('pixels-per-point') || 1;
		this.points = self.data('points') || null;

		// the dimensions requested by the user
		this.dimensions = self.data('dimensions') || null;

		// the chart library requested by the user
		this.library_name = self.data('chart-library') || NETDATA.chartDefaults.library;

		// object - the chart library used
		this.library = null;

		// color management
		this.colors = null;
		this.colors_assigned = {};
		this.colors_available = null;

		// the element already created by the user
		this.element_message = null;

		// the element with the chart
		this.element_chart = null;

		// the element with the legend of the chart (if created by us)
		this.element_legend = null;
		this.element_legend_childs = {
			hidden: null,
			title_date: null,
			title_time: null,
			title_units: null,
			nano: null,
			nano_options: null,
			series: null
		};

		this.chart_url = null;						// string - the url to download chart info
		this.chart = null;							// object - the chart as downloaded from the server

		this.title = self.data('title') || null;	// the title of the chart
		this.units = self.data('units') || null;	// the units of the chart dimensions
		this.append_options = self.data('append-options') || null;	// the units of the chart dimensions

		this.running = false;						// boolean - true when the chart is being refreshed now
		this.validated = false; 					// boolean - has the chart been validated?
		this.enabled = true; 						// boolean - is the chart enabled for refresh?
		this.paused = false;						// boolean - is the chart paused for any reason?
		this.selected = false;						// boolean - is the chart shown a selection?
		this.debug = false;							// boolean - console.log() debug info about this chart

		this.netdata_first = 0;						// milliseconds - the first timestamp in netdata
		this.netdata_last = 0;						// milliseconds - the last timestamp in netdata
		this.requested_after = null;				// milliseconds - the timestamp of the request after param
		this.requested_before = null;				// milliseconds - the timestamp of the request before param
		this.requested_padding = null;
		this.view_after = 0;
		this.view_before = 0;

		this.auto = {
			name: 'auto',
			autorefresh: true,
			force_update_at: 0, // the timestamp to force the update at
			force_before_ms: null,
			force_after_ms: null
		};
		this.pan = {
			name: 'pan',
			autorefresh: false,
			force_update_at: 0, // the timestamp to force the update at
			force_before_ms: null,
			force_after_ms: null
		};
		this.zoom = {
			name: 'zoom',
			autorefresh: false,
			force_update_at: 0, // the timestamp to force the update at
			force_before_ms: null,
			force_after_ms: null
		};

		// this is a pointer to one of the sub-classes below
		// auto, pan, zoom
		this.current = this.auto;

		// check the requested library is available
		// we don't initialize it here - it will be initialized when
		// this chart will be first used
		if(typeof NETDATA.chartLibraries[that.library_name] === 'undefined') {
			NETDATA.error(402, that.library_name);
			error('chart library "' + that.library_name + '" is not found');
			return;
		}
		else if(NETDATA.chartLibraries[that.library_name].enabled === false) {
			NETDATA.error(403, that.library_name);
			error('chart library "' + that.library_name + '" is not enabled');
			return;
		}
		else
			that.library = NETDATA.chartLibraries[that.library_name];

		// milliseconds - the time the last refresh took
		this.refresh_dt_ms = 0;

		// if we need to report the rendering speed
		// find the element that needs to be updated
		var refresh_dt_element_name = self.data('dt-element-name') || null;	// string - the element to print refresh_dt_ms

		if(refresh_dt_element_name !== null)
			this.refresh_dt_element = document.getElementById(refresh_dt_element_name) || null;
		else
			this.refresh_dt_element = null;

		this.dimensions_visibility = new dimensionsVisibility(this);

		this._updating = false;

		// ============================================================================================================
		// PRIVATE FUNCTIONS

		var createDOM = function() {
			if(that.enabled === false) return;

			if(that.element_message !== null) that.element_message.innerHTML = '';
			if(that.element_legend !== null) that.element_legend.innerHTML = '';
			if(that.element_chart !== null) that.element_chart.innerHTML = '';

			that.element.innerHTML = '';

			that.element_message = document.createElement('div');
			that.element_message.className = ' netdata-message hidden';
			that.element.appendChild(that.element_message);

			that.element_chart = document.createElement('div');
			that.element_chart.id = that.library_name + '-' + that.uuid + '-chart';
			that.element.appendChild(that.element_chart);

			if(that.hasLegend() === true) {
				that.element.className = "netdata-container-with-legend";
				that.element_chart.className = 'netdata-chart-with-legend-right netdata-' + that.library_name + '-chart-with-legend-right';

				that.element_legend = document.createElement('div');
				that.element_legend.className = 'netdata-chart-legend netdata-' + that.library_name + '-legend';
				that.element.appendChild(that.element_legend);
			}
			else {
				that.element.className = "netdata-container";
				that.element_chart.className = ' netdata-chart netdata-' + that.library_name + '-chart';

				that.element_legend = null;
			}
			that.element_legend_childs.series = null;

			if(typeof(that.width) === 'string')
				$(that.element).css('width', that.width);
			else if(typeof(that.width) === 'number')
				$(that.element).css('width', that.width + 'px');

			if(typeof(that.library.aspect_ratio) === 'undefined') {
				if(typeof(that.height) === 'string')
					$(that.element).css('height', that.height);
				else if(typeof(that.height) === 'number')
					$(that.element).css('height', that.height + 'px');
			}
			else {
				var w = that.element.offsetWidth;
				if(w === null || w === 0) {
					// the div is hidden
					// this will resize the chart when next viewed
					that.tm.last_resized = 0;
				}
				else
					$(that.element).css('height', (that.element.offsetWidth * that.library.aspect_ratio / 100).toString() + 'px');
			}

			if(NETDATA.chartDefaults.min_width !== null)
				$(that.element).css('min-width', NETDATA.chartDefaults.min_width);

			that.tm.last_dom_created = new Date().getTime();

			showLoading();
		};

		/* init() private
		 * initialize state variables
		 * destroy all (possibly) created state elements
		 * create the basic DOM for a chart
		 */
		var init = function() {
			if(that.enabled === false) return;

			that.paused = false;
			that.selected = false;

			that.chart_created = false;			// boolean - is the library.create() been called?
			that.updates_counter = 0;			// numeric - the number of refreshes made so far
			that.updates_since_last_unhide = 0;	// numeric - the number of refreshes made since the last time the chart was unhidden
			that.updates_since_last_creation = 0; // numeric - the number of refreshes made since the last time the chart was created

			that.tm = {
				last_initialized: 0,		// milliseconds - the timestamp it was last initialized
				last_dom_created: 0,		// milliseconds - the timestamp its DOM was last created
				last_mode_switch: 0,		// milliseconds - the timestamp it switched modes

				last_info_downloaded: 0,	// milliseconds - the timestamp we downloaded the chart
				last_updated: 0,			// the timestamp the chart last updated with data
				pan_and_zoom_seq: 0,		// the sequence number of the global synchronization
											// between chart.
											// Used with NETDATA.globalPanAndZoom.seq
				last_visible_check: 0,		// the time we last checked if it is visible
				last_resized: 0,			// the time the chart was resized
				last_hidden: 0,				// the time the chart was hidden
				last_unhidden: 0,			// the time the chart was unhidden
				last_autorefreshed: 0		// the time the chart was last refreshed
			};

			that.data = null;				// the last data as downloaded from the netdata server
			that.data_url = 'invalid://';	// string - the last url used to update the chart
			that.data_points = 0;			// number - the number of points returned from netdata
			that.data_after = 0;			// milliseconds - the first timestamp of the data
			that.data_before = 0;			// milliseconds - the last timestamp of the data
			that.data_update_every = 0;		// milliseconds - the frequency to update the data

			that.tm.last_initialized = new Date().getTime();
			createDOM();

			that.setMode('auto');
		};

		var maxMessageFontSize = function() {
			// normally we want a font size, as tall as the element
			var h = that.element_message.clientHeight;

			// but give it some air, 20% let's say, or 5 pixels min
			var lost = Math.max(h * 0.2, 5);
			h -= lost;

			// center the text, vertically
			var paddingTop = (lost - 5) / 2;

			// but check the width too
			// it should fit 10 characters in it
			var w = that.element_message.clientWidth / 10;
			if(h > w) {
				paddingTop += (h - w) / 2;
				h = w;
			}

			// and don't make it too huge
			// 5% of the screen size is good
			if(h > screen.height / 20) {
				paddingTop += (h - (screen.height / 20)) / 2;
				h = screen.height / 20;
			}

			// set it
			that.element_message.style.fontSize = h.toString() + 'px';
			that.element_message.style.paddingTop = paddingTop.toString() + 'px';
		};

		var showMessage = function(msg) {
			that.element_message.className = 'netdata-message';
			that.element_message.innerHTML = msg;
			that.element_message.style.fontSize = 'x-small';
			that.element_message.style.paddingTop = '0px';
			that.___messageHidden___ = undefined;
		};

		var showMessageIcon = function(icon) {
			that.element_message.innerHTML = icon;
			that.element_message.className = 'netdata-message icon';
			maxMessageFontSize();
			that.___messageHidden___ = undefined;
		};

		var hideMessage = function() {
			if(typeof that.___messageHidden___ === 'undefined') {
				that.___messageHidden___ = true;
				that.element_message.className = 'netdata-message hidden';
			}
		};

		var showRendering = function() {
			var icon;
			if(that.chart !== null) {
				if(that.chart.chart_type === 'line')
					icon = '<i class="fa fa-line-chart"></i>';
				else
					icon = '<i class="fa fa-area-chart"></i>';
			}
			else
				icon = '<i class="fa fa-area-chart"></i>';

			showMessageIcon(icon + ' netdata');
		};

		var showLoading = function() {
			if(that.chart_created === false) {
				showMessageIcon('<i class="fa fa-refresh"></i> netdata');
				return true;
			}
			return false;
		};

		var isHidden = function() {
			if(typeof that.___chartIsHidden___ !== 'undefined')
				return true;

			return false;
		};

		// hide the chart, when it is not visible - called from isVisible()
		var hideChart = function() {
			// hide it, if it is not already hidden
			if(isHidden() === true) return;

			if(that.chart_created === true) {
				if(NETDATA.options.current.destroy_on_hide === true) {
					// we should destroy it
					init();
				}
				else {
					showRendering();
					that.element_chart.style.display = 'none';
					if(that.element_legend !== null) that.element_legend.style.display = 'none';
					that.tm.last_hidden = new Date().getTime();

					// de-allocate data
					// This works, but I not sure there are no corner cases somewhere
					// so it is commented - if the user has memory issues he can
					// set Destroy on Hide for all charts
					// that.data = null;
				}
			}

			that.___chartIsHidden___ = true;
		};

		// unhide the chart, when it is visible - called from isVisible()
		var unhideChart = function() {
			if(isHidden() === false) return;

			that.___chartIsHidden___ = undefined;
			that.updates_since_last_unhide = 0;

			if(that.chart_created === false) {
				// we need to re-initialize it, to show our background
				// logo in bootstrap tabs, until the chart loads
				init();
			}
			else {
				that.tm.last_unhidden = new Date().getTime();
				that.element_chart.style.display = '';
				if(that.element_legend !== null) that.element_legend.style.display = '';
				resizeChart();
				hideMessage();
			}
		};

		var canBeRendered = function() {
			if(isHidden() === true || that.isVisible(true) === false)
				return false;

			return true;
		};

		// https://github.com/petkaantonov/bluebird/wiki/Optimization-killers
		var callChartLibraryUpdateSafely = function(data) {
			var status;

			if(canBeRendered() === false)
				return false;

			if(NETDATA.options.debug.chart_errors === true)
				status = that.library.update(that, data);
			else {
				try {
					status = that.library.update(that, data);
				}
				catch(err) {
					status = false;
				}
			}

			if(status === false) {
				error('chart failed to be updated as ' + that.library_name);
				return false;
			}

			return true;
		};

		// https://github.com/petkaantonov/bluebird/wiki/Optimization-killers
		var callChartLibraryCreateSafely = function(data) {
			var status;

			if(canBeRendered() === false)
				return false;

			if(NETDATA.options.debug.chart_errors === true)
				status = that.library.create(that, data);
			else {
				try {
					status = that.library.create(that, data);
				}
				catch(err) {
					status = false;
				}
			}

			if(status === false) {
				error('chart failed to be created as ' + that.library_name);
				return false;
			}

			that.chart_created = true;
			that.updates_since_last_creation = 0;
			return true;
		};

		// ----------------------------------------------------------------------------------------------------------------
		// Chart Resize

		// resizeChart() - private
		// to be called just before the chart library to make sure that
		// a properly sized dom is available
		var resizeChart = function() {
			if(that.isVisible() === true && that.tm.last_resized < NETDATA.options.last_resized) {
				if(that.chart_created === false) return;

				if(that.needsRecreation()) {
					init();
				}
				else if(typeof that.library.resize === 'function') {
					that.library.resize(that);

					if(that.element_legend_childs.nano !== null && that.element_legend_childs.nano_options !== null)
						$(that.element_legend_childs.nano).nanoScroller();

					maxMessageFontSize();
				}

				that.tm.last_resized = new Date().getTime();
			}
		};

		// this is the actual chart resize algorithm
		// it will:
		// - resize the entire container
		// - update the internal states
		// - resize the chart as the div changes height
		// - update the scrollbar of the legend
		var resizeChartToHeight = function(h) {
			// console.log(h);
			that.element.style.height = h;

			if(that.settings_id !== null)
				NETDATA.localStorageSet('chart_heights.' + that.settings_id, h);

			var now = new Date().getTime();
			NETDATA.options.last_page_scroll = now;
			NETDATA.options.auto_refresher_stop_until = now + NETDATA.options.current.stop_updates_while_resizing;

			// force a resize
			that.tm.last_resized = 0;
			resizeChart();
		};

		this.resizeHandler = function(e) {
			e.preventDefault();

			if(typeof this.event_resize === 'undefined'
				|| this.event_resize.chart_original_w === 'undefined'
				|| this.event_resize.chart_original_h === 'undefined')
				this.event_resize = {
					chart_original_w: this.element.clientWidth,
					chart_original_h: this.element.clientHeight,
					last: 0
				};

			if(e.type === 'touchstart') {
				this.event_resize.mouse_start_x = e.touches.item(0).pageX;
				this.event_resize.mouse_start_y = e.touches.item(0).pageY;
			}
			else {
				this.event_resize.mouse_start_x = e.clientX;
				this.event_resize.mouse_start_y = e.clientY;
			}

			this.event_resize.chart_start_w = this.element.clientWidth;
			this.event_resize.chart_start_h = this.element.clientHeight;
			this.event_resize.chart_last_w = this.element.clientWidth;
			this.event_resize.chart_last_h = this.element.clientHeight;

			var now = new Date().getTime();
			if(now - this.event_resize.last <= NETDATA.options.current.double_click_speed) {
				// double click / double tap event

				// the optimal height of the chart
				// showing the entire legend
				var optimal = this.event_resize.chart_last_h
						+ this.element_legend_childs.content.scrollHeight
						- this.element_legend_childs.content.clientHeight;

				// if we are not optimal, be optimal
				if(this.event_resize.chart_last_h != optimal)
					resizeChartToHeight(optimal.toString() + 'px');

				// else if we do not have the original height
				// reset to the original height
				else if(this.event_resize.chart_last_h != this.event_resize.chart_original_h)
					resizeChartToHeight(this.event_resize.chart_original_h.toString() + 'px');
			}
			else {
				this.event_resize.last = now;

				// process movement event
				document.onmousemove =
				document.ontouchmove =
				this.element_legend_childs.resize_handler.onmousemove =
				this.element_legend_childs.resize_handler.ontouchmove =
					function(e) {
						var y = null;

						switch(e.type) {
							case 'mousemove': y = e.clientY; break;
							case 'touchmove': y = e.touches.item(e.touches - 1).pageY; break;
						}

						if(y !== null) {
							var	newH = that.event_resize.chart_start_h + y - that.event_resize.mouse_start_y;

							if(newH >= 70 && newH !== that.event_resize.chart_last_h) {
								resizeChartToHeight(newH.toString() + 'px');
								that.event_resize.chart_last_h = newH;
							}
						}
					};

				// process end event
				document.onmouseup =
				document.ontouchend =
				this.element_legend_childs.resize_handler.onmouseup =
				this.element_legend_childs.resize_handler.ontouchend =
					function(e) {
						// remove all the hooks
						document.onmouseup =
						document.onmousemove =
						document.ontouchmove =
						document.ontouchend =
						that.element_legend_childs.resize_handler.onmousemove =
						that.element_legend_childs.resize_handler.ontouchmove =
						that.element_legend_childs.resize_handler.onmouseout =
						that.element_legend_childs.resize_handler.onmouseup =
						that.element_legend_childs.resize_handler.ontouchend =
							null;

						// allow auto-refreshes
						NETDATA.options.auto_refresher_stop_until = 0;
					};
			}
		};


		var noDataToShow = function() {
			showMessageIcon('<i class="fa fa-warning"></i> empty');
			that.legendUpdateDOM();
			that.tm.last_autorefreshed = new Date().getTime();
			// that.data_update_every = 30 * 1000;
			//that.element_chart.style.display = 'none';
			//if(that.element_legend !== null) that.element_legend.style.display = 'none';
			//that.___chartIsHidden___ = true;
		};

		// ============================================================================================================
		// PUBLIC FUNCTIONS

		this.error = function(msg) {
			error(msg);
		};

		this.setMode = function(m) {
			if(this.current !== null && this.current.name === m) return;

			if(m === 'auto')
				this.current = this.auto;
			else if(m === 'pan')
				this.current = this.pan;
			else if(m === 'zoom')
				this.current = this.zoom;
			else
				this.current = this.auto;

			this.current.force_update_at = 0;
			this.current.force_before_ms = null;
			this.current.force_after_ms = null;

			this.tm.last_mode_switch = new Date().getTime();
		};

		// ----------------------------------------------------------------------------------------------------------------
		// global selection sync

		// prevent to global selection sync for some time
		this.globalSelectionSyncDelay = function(ms) {
			if(NETDATA.options.current.sync_selection === false)
				return;

			if(typeof ms === 'number')
				NETDATA.globalSelectionSync.dont_sync_before = new Date().getTime() + ms;
			else
				NETDATA.globalSelectionSync.dont_sync_before = new Date().getTime() + NETDATA.options.current.sync_selection_delay;
		};

		// can we globally apply selection sync?
		this.globalSelectionSyncAbility = function() {
			if(NETDATA.options.current.sync_selection === false)
				return false;

			if(NETDATA.globalSelectionSync.dont_sync_before > new Date().getTime())
				return false;

			return true;
		};

		this.globalSelectionSyncIsMaster = function() {
			if(NETDATA.globalSelectionSync.state === this)
				return true;
			else
				return false;
		};

		// this chart is the master of the global selection sync
		this.globalSelectionSyncBeMaster = function() {
			// am I the master?
			if(this.globalSelectionSyncIsMaster()) {
				if(this.debug === true)
					this.log('sync: I am the master already.');

				return;
			}

			if(NETDATA.globalSelectionSync.state) {
				if(this.debug === true)
					this.log('sync: I am not the sync master. Resetting global sync.');

				this.globalSelectionSyncStop();
			}

			// become the master
			if(this.debug === true)
				this.log('sync: becoming sync master.');

			this.selected = true;
			NETDATA.globalSelectionSync.state = this;

			// find the all slaves
			var targets = NETDATA.options.targets;
			var len = targets.length;
			while(len--) {
				st = targets[len];

				if(st === this) {
					if(this.debug === true)
						st.log('sync: not adding me to sync');
				}
				else if(st.globalSelectionSyncIsEligible()) {
					if(this.debug === true)
						st.log('sync: adding to sync as slave');

					st.globalSelectionSyncBeSlave();
				}
			}

			// this.globalSelectionSyncDelay(100);
		};

		// can the chart participate to the global selection sync as a slave?
		this.globalSelectionSyncIsEligible = function() {
			if(this.enabled === true
				&& this.library !== null
				&& typeof this.library.setSelection === 'function'
				&& this.isVisible() === true
				&& this.chart_created === true)
				return true;

			return false;
		};

		// this chart becomes a slave of the global selection sync
		this.globalSelectionSyncBeSlave = function() {
			if(NETDATA.globalSelectionSync.state !== this)
				NETDATA.globalSelectionSync.slaves.push(this);
		};

		// sync all the visible charts to the given time
		// this is to be called from the chart libraries
		this.globalSelectionSync = function(t) {
			if(this.globalSelectionSyncAbility() === false) {
				if(this.debug === true)
					this.log('sync: cannot sync (yet?).');

				return;
			}

			if(this.globalSelectionSyncIsMaster() === false) {
				if(this.debug === true)
					this.log('sync: trying to be sync master.');

				this.globalSelectionSyncBeMaster();

				if(this.globalSelectionSyncAbility() === false) {
					if(this.debug === true)
						this.log('sync: cannot sync (yet?).');

					return;
				}
			}

			NETDATA.globalSelectionSync.last_t = t;
			$.each(NETDATA.globalSelectionSync.slaves, function(i, st) {
				st.setSelection(t);
			});
		};

		// stop syncing all charts to the given time
		this.globalSelectionSyncStop = function() {
			if(NETDATA.globalSelectionSync.slaves.length) {
				if(this.debug === true)
					this.log('sync: cleaning up...');

				$.each(NETDATA.globalSelectionSync.slaves, function(i, st) {
					if(st === that) {
						if(that.debug === true)
							st.log('sync: not adding me to sync stop');
					}
					else {
						if(that.debug === true)
							st.log('sync: removed slave from sync');

						st.clearSelection();
					}
				});

				NETDATA.globalSelectionSync.last_t = 0;
				NETDATA.globalSelectionSync.slaves = [];
				NETDATA.globalSelectionSync.state = null;
			}

			this.clearSelection();
		};

		this.setSelection = function(t) {
			if(typeof this.library.setSelection === 'function') {
				if(this.library.setSelection(this, t) === true)
					this.selected = true;
				else
					this.selected = false;
			}
			else this.selected = true;

			if(this.selected === true && this.debug === true)
				this.log('selection set to ' + t.toString());

			return this.selected;
		};

		this.clearSelection = function() {
			if(this.selected === true) {
				if(typeof this.library.clearSelection === 'function') {
					if(this.library.clearSelection(this) === true)
						this.selected = false;
					else
						this.selected = true;
				}
				else this.selected = false;

				if(this.selected === false && this.debug === true)
					this.log('selection cleared');

				this.legendReset();
			}

			return this.selected;
		};

		// find if a timestamp (ms) is shown in the current chart
		this.timeIsVisible = function(t) {
			if(t >= this.data_after && t <= this.data_before)
				return true;
			return false;
		};

		this.calculateRowForTime = function(t) {
			if(this.timeIsVisible(t) === false) return -1;
			return Math.floor((t - this.data_after) / this.data_update_every);
		};

		// ----------------------------------------------------------------------------------------------------------------

		// console logging
		this.log = function(msg) {
			console.log(this.id + ' (' + this.library_name + ' ' + this.uuid + '): ' + msg);
		};

		this.pauseChart = function() {
			if(this.paused === false) {
				if(this.debug === true)
					this.log('pauseChart()');

				this.paused = true;
			}
		};

		this.unpauseChart = function() {
			if(this.paused === true) {
				if(this.debug === true)
					this.log('unpauseChart()');

				this.paused = false;
			}
		};

		this.resetChart = function(dont_clear_master, dont_update) {
			if(this.debug === true)
				this.log('resetChart(' + dont_clear_master + ', ' + dont_update + ') called');

			if(typeof dont_clear_master === 'undefined')
				dont_clear_master = false;

			if(typeof dont_update === 'undefined')
				dont_update = false;

			if(dont_clear_master !== true && NETDATA.globalPanAndZoom.isMaster(this) === true) {
				if(this.debug === true)
					this.log('resetChart() diverting to clearMaster().');
				// this will call us back with master === true
				NETDATA.globalPanAndZoom.clearMaster();
				return;
			}

			this.clearSelection();

			this.tm.pan_and_zoom_seq = 0;

			this.setMode('auto');
			this.current.force_update_at = 0;
			this.current.force_before_ms = null;
			this.current.force_after_ms = null;
			this.tm.last_autorefreshed = 0;
			this.paused = false;
			this.selected = false;
			this.enabled = true;
			// this.debug = false;

			// do not update the chart here
			// or the chart will flip-flop when it is the master
			// of a selection sync and another chart becomes
			// the new master

			if(dont_update !== true && this.isVisible() === true) {
				this.updateChart();
			}
		};

		this.updateChartPanOrZoom = function(after, before) {
			var logme = 'updateChartPanOrZoom(' + after + ', ' + before + '): ';
			var ret = true;

			if(this.debug === true)
				this.log(logme);

			if(before < after) {
				if(this.debug === true)
					this.log(logme + 'flipped parameters, rejecting it.');

				return false;
			}

			if(typeof this.fixed_min_duration === 'undefined')
				this.fixed_min_duration = Math.round((this.chartWidth() / 30) * this.chart.update_every * 1000);

			var min_duration = this.fixed_min_duration;
			var current_duration = Math.round(this.view_before - this.view_after);

			// round the numbers
			after = Math.round(after);
			before = Math.round(before);

			// align them to update_every
			// stretching them further away
			after -= after % this.data_update_every;
			before += this.data_update_every - (before % this.data_update_every);

			// the final wanted duration
			var wanted_duration = before - after;

			// to allow panning, accept just a point below our minimum
			if((current_duration - this.data_update_every) < min_duration)
				min_duration = current_duration - this.data_update_every;

			// we do it, but we adjust to minimum size and return false
			// when the wanted size is below the current and the minimum
			// and we zoom
			if(wanted_duration < current_duration && wanted_duration < min_duration) {
				if(this.debug === true)
					this.log(logme + 'too small: min_duration: ' + (min_duration / 1000).toString() + ', wanted: ' + (wanted_duration / 1000).toString());

				min_duration = this.fixed_min_duration;

				var dt = (min_duration - wanted_duration) / 2;
				before += dt;
				after -= dt;
				wanted_duration = before - after;
				ret = false;
			}

			var tolerance = this.data_update_every * 2;
			var movement = Math.abs(before - this.view_before);

			if(Math.abs(current_duration - wanted_duration) <= tolerance && movement <= tolerance && ret === true) {
				if(this.debug === true)
					this.log(logme + 'REJECTING UPDATE: current/min duration: ' + (current_duration / 1000).toString() + '/' + (this.fixed_min_duration / 1000).toString() + ', wanted duration: ' + (wanted_duration / 1000).toString() + ', duration diff: ' + (Math.round(Math.abs(current_duration - wanted_duration) / 1000)).toString() + ', movement: ' + (movement / 1000).toString() + ', tolerance: ' + (tolerance / 1000).toString() + ', returning: ' + false);
				return false;
			}

			if(this.current.name === 'auto') {
				this.log(logme + 'caller called me with mode: ' + this.current.name);
				this.setMode('pan');
			}

			if(this.debug === true)
				this.log(logme + 'ACCEPTING UPDATE: current/min duration: ' + (current_duration / 1000).toString() + '/' + (this.fixed_min_duration / 1000).toString() + ', wanted duration: ' + (wanted_duration / 1000).toString() + ', duration diff: ' + (Math.round(Math.abs(current_duration - wanted_duration) / 1000)).toString() + ', movement: ' + (movement / 1000).toString() + ', tolerance: ' + (tolerance / 1000).toString() + ', returning: ' + ret);

			this.current.force_update_at = new Date().getTime() + NETDATA.options.current.pan_and_zoom_delay;
			this.current.force_after_ms = after;
			this.current.force_before_ms = before;
			NETDATA.globalPanAndZoom.setMaster(this, after, before);
			return ret;
		};

		this.legendFormatValue = function(value) {
			if(value === null || value === 'undefined') return '-';
			if(typeof value !== 'number') return value;

			var abs = Math.abs(value);
			if(abs >= 1000) return (Math.round(value)).toLocaleString();
			if(abs >= 100 ) return (Math.round(value * 10) / 10).toLocaleString();
			if(abs >= 1   ) return (Math.round(value * 100) / 100).toLocaleString();
			if(abs >= 0.1 ) return (Math.round(value * 1000) / 1000).toLocaleString();
			return (Math.round(value * 10000) / 10000).toLocaleString();
		};

		this.legendSetLabelValue = function(label, value) {
			var series = this.element_legend_childs.series[label];
			if(typeof series === 'undefined') return;
			if(series.value === null && series.user === null) return;

			// if the value has not changed, skip DOM update
			//if(series.last === value) return;

			var s, r;
			if(typeof value === 'number') {
				var v = Math.abs(value);
				s = r = this.legendFormatValue(value);

				if(typeof series.last === 'number') {
					if(v > series.last) s += '<i class="fa fa-angle-up" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
					else if(v < series.last) s += '<i class="fa fa-angle-down" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
					else s += '<i class="fa fa-angle-left" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
				}
				else s += '<i class="fa fa-angle-right" style="width: 8px; text-align: center; overflow: hidden; vertical-align: middle;"></i>';
				series.last = v;
			}
			else {
				s = r = value;
				series.last = value;
			}

			if(series.value !== null) series.value.innerHTML = s;
			if(series.user !== null) series.user.innerHTML = r;
		};

		this.legendSetDate = function(ms) {
			if(typeof ms !== 'number') {
				this.legendShowUndefined();
				return;
			}

			var d = new Date(ms);

			if(this.element_legend_childs.title_date)
				this.element_legend_childs.title_date.innerHTML = d.toLocaleDateString();

			if(this.element_legend_childs.title_time)
				this.element_legend_childs.title_time.innerHTML = d.toLocaleTimeString();

			if(this.element_legend_childs.title_units)
				this.element_legend_childs.title_units.innerHTML = this.units;
		};

		this.legendShowUndefined = function() {
			if(this.element_legend_childs.title_date)
				this.element_legend_childs.title_date.innerHTML = '&nbsp;';

			if(this.element_legend_childs.title_time)
				this.element_legend_childs.title_time.innerHTML = this.chart.name;

			if(this.element_legend_childs.title_units)
				this.element_legend_childs.title_units.innerHTML = '&nbsp;';

			if(this.data && this.element_legend_childs.series !== null) {
				var labels = this.data.dimension_names;
				var i = labels.length;
				while(i--) {
					var label = labels[i];

					if(typeof label === 'undefined') continue;
					if(typeof this.element_legend_childs.series[label] === 'undefined') continue;
					this.legendSetLabelValue(label, null);
				}
			}
		};

		this.legendShowLatestValues = function() {
			if(this.chart === null) return;
			if(this.selected) return;

			if(this.data === null || this.element_legend_childs.series === null) {
				this.legendShowUndefined();
				return;
			}

			var show_undefined = true;
			if(Math.abs(this.netdata_last - this.view_before) <= this.data_update_every)
				show_undefined = false;

			if(show_undefined) {
				this.legendShowUndefined();
				return;
			}

			this.legendSetDate(this.view_before);

			var labels = this.data.dimension_names;
			var i = labels.length;
			while(i--) {
				var label = labels[i];

				if(typeof label === 'undefined') continue;
				if(typeof this.element_legend_childs.series[label] === 'undefined') continue;

				if(show_undefined)
					this.legendSetLabelValue(label, null);
				else
					this.legendSetLabelValue(label, this.data.view_latest_values[i]);
			}
		};

		this.legendReset = function() {
			this.legendShowLatestValues();
		};

		// this should be called just ONCE per dimension per chart
		this._chartDimensionColor = function(label) {
			if(this.colors === null) this.chartColors();

			if(typeof this.colors_assigned[label] === 'undefined') {
				if(this.colors_available.length === 0) {
					for(var i = 0, len = NETDATA.themes.current.colors.length; i < len ; i++)
						this.colors_available.push(NETDATA.themes.current.colors[i]);
				}

				this.colors_assigned[label] = this.colors_available.shift();

				if(this.debug === true)
					this.log('label "' + label + '" got color "' + this.colors_assigned[label]);
			}
			else {
				if(this.debug === true)
					this.log('label "' + label + '" already has color "' + this.colors_assigned[label] + '"');
			}

			this.colors.push(this.colors_assigned[label]);
			return this.colors_assigned[label];
		};

		this.chartColors = function() {
			if(this.colors !== null) return this.colors;

			this.colors = new Array();
			this.colors_available = new Array();
			var i, len;

			var c = $(this.element).data('colors');
			// this.log('read colors: ' + c);
			if(typeof c !== 'undefined' && c !== null && c.length > 0) {
				if(typeof c !== 'string') {
					this.log('invalid color given: ' + c + ' (give a space separated list of colors)');
				}
				else {
					c = c.split(' ');
					var added = 0;

					while(added < 20) {
						for(i = 0, len = c.length; i < len ; i++) {
							added++;
							this.colors_available.push(c[i]);
							// this.log('adding color: ' + c[i]);
						}
					}
				}
			}

			// push all the standard colors too
			for(i = 0, len = NETDATA.themes.current.colors.length; i < len ; i++)
				this.colors_available.push(NETDATA.themes.current.colors[i]);

			return this.colors;
		};

		this.legendUpdateDOM = function() {
			var needed = false;

			// check that the legend DOM is up to date for the downloaded dimensions
			if(typeof this.element_legend_childs.series !== 'object' || this.element_legend_childs.series === null) {
				// this.log('the legend does not have any series - requesting legend update');
				needed = true;
			}
			else if(this.data === null) {
				// this.log('the chart does not have any data - requesting legend update');
				needed = true;
			}
			else if(typeof this.element_legend_childs.series.labels_key === 'undefined') {
				needed = true;
			}
			else {
				var labels = this.data.dimension_names.toString();
				if(labels !== this.element_legend_childs.series.labels_key) {
					needed = true;

					if(this.debug === true)
						this.log('NEW LABELS: "' + labels + '" NOT EQUAL OLD LABELS: "' + this.element_legend_childs.series.labels_key + '"');
				}
			}

			if(needed === false) {
				// make sure colors available
				this.chartColors();

				// do we have to update the current values?
				// we do this, only when the visible chart is current
				if(Math.abs(this.netdata_last - this.view_before) <= this.data_update_every) {
					if(this.debug === true)
						this.log('chart is in latest position... updating values on legend...');

					//var labels = this.data.dimension_names;
					//var i = labels.length;
					//while(i--)
					//	this.legendSetLabelValue(labels[i], this.data.latest_values[i]);
				}
				return;
			}
			if(this.colors === null) {
				// this is the first time we update the chart
				// let's assign colors to all dimensions
				if(this.library.track_colors() === true)
					for(var dim in this.chart.dimensions)
						this._chartDimensionColor(this.chart.dimensions[dim].name);
			}
			// we will re-generate the colors for the chart
			// based on the selected dimensions
			this.colors = null;

			if(this.debug === true)
				this.log('updating Legend DOM');

			// mark all dimensions as invalid
			this.dimensions_visibility.invalidateAll();

			var genLabel = function(state, parent, name, count) {
				var color = state._chartDimensionColor(name);

				var user_element = null;
				var user_id = self.data('show-value-of-' + name + '-at') || null;
				if(user_id !== null) {
					user_element = document.getElementById(user_id) || null;
					if(user_element === null)
						state.log('Cannot find element with id: ' + user_id);
				}

				state.element_legend_childs.series[name] = {
					name: document.createElement('span'),
					value: document.createElement('span'),
					user: user_element,
					last: null
				};

				var label = state.element_legend_childs.series[name];

				// create the dimension visibility tracking for this label
				state.dimensions_visibility.dimensionAdd(name, label.name, label.value, color);

				var rgb = NETDATA.colorHex2Rgb(color);
				label.name.innerHTML = '<table class="netdata-legend-name-table-'
					+ state.chart.chart_type
					+ '" style="background-color: '
					+ 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + NETDATA.options.current['color_fill_opacity_' + state.chart.chart_type] + ')'
					+ '"><tr class="netdata-legend-name-tr"><td class="netdata-legend-name-td"></td></tr></table>'

				var text = document.createTextNode(' ' + name);
				label.name.appendChild(text);

				if(count > 0)
					parent.appendChild(document.createElement('br'));

				parent.appendChild(label.name);
				parent.appendChild(label.value);
			};

			var content = document.createElement('div');

			if(this.hasLegend()) {
				this.element_legend_childs = {
					content: content,
					resize_handler: document.createElement('div'),
					toolbox: document.createElement('div'),
					toolbox_left: document.createElement('div'),
					toolbox_right: document.createElement('div'),
					toolbox_reset: document.createElement('div'),
					toolbox_zoomin: document.createElement('div'),
					toolbox_zoomout: document.createElement('div'),
					toolbox_volume: document.createElement('div'),
					title_date: document.createElement('span'),
					title_time: document.createElement('span'),
					title_units: document.createElement('span'),
					nano: document.createElement('div'),
					nano_options: {
						paneClass: 'netdata-legend-series-pane',
						sliderClass: 'netdata-legend-series-slider',
						contentClass: 'netdata-legend-series-content',
						enabledClass: '__enabled',
						flashedClass: '__flashed',
						activeClass: '__active',
						tabIndex: -1,
						alwaysVisible: true,
						sliderMinHeight: 10
					},
					series: {}
				};

				this.element_legend.innerHTML = '';

				if(this.library.toolboxPanAndZoom !== null) {

					function get_pan_and_zoom_step(event) {
						if (event.ctrlKey)
							return NETDATA.options.current.pan_and_zoom_factor * NETDATA.options.current.pan_and_zoom_factor_multiplier_control;

						else if (event.shiftKey)
							return NETDATA.options.current.pan_and_zoom_factor * NETDATA.options.current.pan_and_zoom_factor_multiplier_shift;

						else if (event.altKey)
							return NETDATA.options.current.pan_and_zoom_factor * NETDATA.options.current.pan_and_zoom_factor_multiplier_alt;

						else
							return NETDATA.options.current.pan_and_zoom_factor;
					}

					this.element_legend_childs.toolbox.className += ' netdata-legend-toolbox';
					this.element.appendChild(this.element_legend_childs.toolbox);

					this.element_legend_childs.toolbox_left.className += ' netdata-legend-toolbox-button';
					this.element_legend_childs.toolbox_left.innerHTML = '<i class="fa fa-backward"></i>';
					this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_left);
					this.element_legend_childs.toolbox_left.onclick = function(e) {
						e.preventDefault();

						var step = (that.view_before - that.view_after) * get_pan_and_zoom_step(e);
						var before = that.view_before - step;
						var after = that.view_after - step;
						if(after >= that.netdata_first)
							that.library.toolboxPanAndZoom(that, after, before);
					};
					if(NETDATA.options.current.show_help === true)
						$(this.element_legend_childs.toolbox_left).popover({
						container: "body",
						animation: false,
						html: true,
						trigger: 'hover',
						placement: 'bottom',
						delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
						title: 'Pan Left',
						content: 'Pan the chart to the left. You can also <b>drag it</b> with your mouse or your finger (on touch devices).<br/><small>Help, can be disabled from the settings.</small>'
					});


					this.element_legend_childs.toolbox_reset.className += ' netdata-legend-toolbox-button';
					this.element_legend_childs.toolbox_reset.innerHTML = '<i class="fa fa-play"></i>';
					this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_reset);
					this.element_legend_childs.toolbox_reset.onclick = function(e) {
						e.preventDefault();
						NETDATA.resetAllCharts(that);
					};
					if(NETDATA.options.current.show_help === true)
						$(this.element_legend_childs.toolbox_reset).popover({
						container: "body",
						animation: false,
						html: true,
						trigger: 'hover',
						placement: 'bottom',
						delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
						title: 'Chart Reset',
						content: 'Reset all the charts to their default auto-refreshing state. You can also <b>double click</b> the chart contents with your mouse or your finger (on touch devices).<br/><small>Help, can be disabled from the settings.</small>'
					});
					
					this.element_legend_childs.toolbox_right.className += ' netdata-legend-toolbox-button';
					this.element_legend_childs.toolbox_right.innerHTML = '<i class="fa fa-forward"></i>';
					this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_right);
					this.element_legend_childs.toolbox_right.onclick = function(e) {
						e.preventDefault();
						var step = (that.view_before - that.view_after) * get_pan_and_zoom_step(e);
						var before = that.view_before + step;
						var after = that.view_after + step;
						if(before <= that.netdata_last)
							that.library.toolboxPanAndZoom(that, after, before);
					};
					if(NETDATA.options.current.show_help === true)
						$(this.element_legend_childs.toolbox_right).popover({
						container: "body",
						animation: false,
						html: true,
						trigger: 'hover',
						placement: 'bottom',
						delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
						title: 'Pan Right',
						content: 'Pan the chart to the right. You can also <b>drag it</b> with your mouse or your finger (on touch devices).<br/><small>Help, can be disabled from the settings.</small>'
					});

					
					this.element_legend_childs.toolbox_zoomin.className += ' netdata-legend-toolbox-button';
					this.element_legend_childs.toolbox_zoomin.innerHTML = '<i class="fa fa-plus"></i>';
					this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_zoomin);
					this.element_legend_childs.toolbox_zoomin.onclick = function(e) {
						e.preventDefault();
						var dt = ((that.view_before - that.view_after) * (get_pan_and_zoom_step(e) * 0.8) / 2);
						var before = that.view_before - dt;
						var after = that.view_after + dt;
						that.library.toolboxPanAndZoom(that, after, before);
					};
					if(NETDATA.options.current.show_help === true)
						$(this.element_legend_childs.toolbox_zoomin).popover({
						container: "body",
						animation: false,
						html: true,
						trigger: 'hover',
						placement: 'bottom',
						delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
						title: 'Chart Zoom In',
						content: 'Zoom in the chart. You can also press SHIFT and select an area of the chart to zoom in. On Chrome and Opera, you can press the SHIFT or the ALT keys and then use the mouse wheel to zoom in or out.<br/><small>Help, can be disabled from the settings.</small>'
					});
					
					this.element_legend_childs.toolbox_zoomout.className += ' netdata-legend-toolbox-button';
					this.element_legend_childs.toolbox_zoomout.innerHTML = '<i class="fa fa-minus"></i>';
					this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_zoomout);
					this.element_legend_childs.toolbox_zoomout.onclick = function(e) {
						e.preventDefault();
						var dt = (((that.view_before - that.view_after) / (1.0 - (get_pan_and_zoom_step(e) * 0.8)) - (that.view_before - that.view_after)) / 2);
						var before = that.view_before + dt;
						var after = that.view_after - dt;

						that.library.toolboxPanAndZoom(that, after, before);
					};
					if(NETDATA.options.current.show_help === true)
						$(this.element_legend_childs.toolbox_zoomout).popover({
						container: "body",
						animation: false,
						html: true,
						trigger: 'hover',
						placement: 'bottom',
						delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
						title: 'Chart Zoom Out',
						content: 'Zoom out the chart. On Chrome and Opera, you can also press the SHIFT or the ALT keys and then use the mouse wheel to zoom in or out.<br/><small>Help, can be disabled from the settings.</small>'
					});
					
					//this.element_legend_childs.toolbox_volume.className += ' netdata-legend-toolbox-button';
					//this.element_legend_childs.toolbox_volume.innerHTML = '<i class="fa fa-sort-amount-desc"></i>';
					//this.element_legend_childs.toolbox_volume.title = 'Visible Volume';
					//this.element_legend_childs.toolbox.appendChild(this.element_legend_childs.toolbox_volume);
					//this.element_legend_childs.toolbox_volume.onclick = function(e) {
						//e.preventDefault();
						//alert('clicked toolbox_volume on ' + that.id);
					//}
				}
				else {
					this.element_legend_childs.toolbox = null;
					this.element_legend_childs.toolbox_left = null;
					this.element_legend_childs.toolbox_reset = null;
					this.element_legend_childs.toolbox_right = null;
					this.element_legend_childs.toolbox_zoomin = null;
					this.element_legend_childs.toolbox_zoomout = null;
					this.element_legend_childs.toolbox_volume = null;
				}
				
				this.element_legend_childs.resize_handler.className += " netdata-legend-resize-handler";
				this.element_legend_childs.resize_handler.innerHTML = '<i class="fa fa-chevron-up"></i><i class="fa fa-chevron-down"></i>';
				this.element.appendChild(this.element_legend_childs.resize_handler);
				if(NETDATA.options.current.show_help === true)
					$(this.element_legend_childs.resize_handler).popover({
					container: "body",
					animation: false,
					html: true,
					trigger: 'hover',
					placement: 'bottom',
					delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
					title: 'Chart Resize',
					content: 'Drag this point with your mouse or your finger (on touch devices), to resize the chart vertically. You can also <b>double click it</b> or <b>double tap it</b> to reset between 2 states: the default and the one that fits all the values.<br/><small>Help, can be disabled from the settings.</small>'
				});

				// mousedown event
				this.element_legend_childs.resize_handler.onmousedown =
					function(e) {
						that.resizeHandler(e);
					};

				// touchstart event
				this.element_legend_childs.resize_handler.addEventListener('touchstart', function(e) {
					that.resizeHandler(e);
				}, false);

				this.element_legend_childs.title_date.className += " netdata-legend-title-date";
				this.element_legend.appendChild(this.element_legend_childs.title_date);

				this.element_legend.appendChild(document.createElement('br'));

				this.element_legend_childs.title_time.className += " netdata-legend-title-time";
				this.element_legend.appendChild(this.element_legend_childs.title_time);

				this.element_legend.appendChild(document.createElement('br'));

				this.element_legend_childs.title_units.className += " netdata-legend-title-units";
				this.element_legend.appendChild(this.element_legend_childs.title_units);

				this.element_legend.appendChild(document.createElement('br'));

				this.element_legend_childs.nano.className = 'netdata-legend-series';
				this.element_legend.appendChild(this.element_legend_childs.nano);

				content.className = 'netdata-legend-series-content';
				this.element_legend_childs.nano.appendChild(content);

				if(NETDATA.options.current.show_help === true)
					$(content).popover({
					container: "body",
					animation: false,
					html: true,
					trigger: 'hover',
					placement: 'bottom',
					title: 'Chart Legend',
					delay: { show: NETDATA.options.current.show_help_delay_show_ms, hide: NETDATA.options.current.show_help_delay_hide_ms },
					content: 'You can click or tap on the values or the labels to select dimentions. By pressing SHIFT or CONTROL, you can enable or disable multiple dimensions.<br/><small>Help, can be disabled from the settings.</small>'
				});
			}
			else {
				this.element_legend_childs = {
					content: content,
					resize_handler: null,
					toolbox: null,
					toolbox_left: null,
					toolbox_right: null,
					toolbox_reset: null,
					toolbox_zoomin: null,
					toolbox_zoomout: null,
					toolbox_volume: null,
					title_date: null,
					title_time: null,
					title_units: null,
					nano: null,
					nano_options: null,
					series: {}
				};
			}

			if(this.data) {
				this.element_legend_childs.series.labels_key = this.data.dimension_names.toString();
				if(this.debug === true)
					this.log('labels from data: "' + this.element_legend_childs.series.labels_key + '"');

				for(var i = 0, len = this.data.dimension_names.length; i < len ;i++) {
					genLabel(this, content, this.data.dimension_names[i], i);
				}
			}
			else {
				var tmp = new Array();
				for(var dim in this.chart.dimensions) {
					tmp.push(this.chart.dimensions[dim].name);
					genLabel(this, content, this.chart.dimensions[dim].name, i);
				}
				this.element_legend_childs.series.labels_key = tmp.toString();
				if(this.debug === true)
					this.log('labels from chart: "' + this.element_legend_childs.series.labels_key + '"');
			}

			// create a hidden div to be used for hidding
			// the original legend of the chart library
			var el = document.createElement('div');
			if(this.element_legend !== null)
				this.element_legend.appendChild(el);
			el.style.display = 'none';

			this.element_legend_childs.hidden = document.createElement('div');
			el.appendChild(this.element_legend_childs.hidden);

			if(this.element_legend_childs.nano !== null && this.element_legend_childs.nano_options !== null)
				$(this.element_legend_childs.nano).nanoScroller(this.element_legend_childs.nano_options);

			this.legendShowLatestValues();
		};

		this.hasLegend = function() {
			if(typeof this.___hasLegendCache___ !== 'undefined')
				return this.___hasLegendCache___;

			var leg = false;
			if(this.library && this.library.legend(this) === 'right-side') {
				var legend = $(this.element).data('legend') || 'yes';
				if(legend === 'yes') leg = true;
			}

			this.___hasLegendCache___ = leg;
			return leg;
		};

		this.legendWidth = function() {
			return (this.hasLegend())?140:0;
		};

		this.legendHeight = function() {
			return $(this.element).height();
		};

		this.chartWidth = function() {
			return $(this.element).width() - this.legendWidth();
		};

		this.chartHeight = function() {
			return $(this.element).height();
		};

		this.chartPixelsPerPoint = function() {
			// force an options provided detail
			var px = this.pixels_per_point;

			if(this.library && px < this.library.pixels_per_point(this))
				px = this.library.pixels_per_point(this);

			if(px < NETDATA.options.current.pixels_per_point)
				px = NETDATA.options.current.pixels_per_point;

			return px;
		};

		this.needsRecreation = function() {
			return (
					this.chart_created === true
					&& this.library
					&& this.library.autoresize() === false
					&& this.tm.last_resized < NETDATA.options.last_resized
				);
		};

		this.chartURL = function() {
			var after, before, points_multiplier = 1;
			if(NETDATA.globalPanAndZoom.isActive() && NETDATA.globalPanAndZoom.isMaster(this) === false) {
				this.tm.pan_and_zoom_seq = NETDATA.globalPanAndZoom.seq;

				after = Math.round(NETDATA.globalPanAndZoom.force_after_ms / 1000);
				before = Math.round(NETDATA.globalPanAndZoom.force_before_ms / 1000);
				this.view_after = after * 1000;
				this.view_before = before * 1000;

				this.requested_padding = null;
				points_multiplier = 1;
			}
			else if(this.current.force_before_ms !== null && this.current.force_after_ms !== null) {
				this.tm.pan_and_zoom_seq = 0;

				before = Math.round(this.current.force_before_ms / 1000);
				after  = Math.round(this.current.force_after_ms / 1000);
				this.view_after = after * 1000;
				this.view_before = before * 1000;

				if(NETDATA.options.current.pan_and_zoom_data_padding === true) {
					this.requested_padding = Math.round((before - after) / 2);
					after -= this.requested_padding;
					before += this.requested_padding;
					this.requested_padding *= 1000;
					points_multiplier = 2;
				}

				this.current.force_before_ms = null;
				this.current.force_after_ms = null;
			}
			else {
				this.tm.pan_and_zoom_seq = 0;

				before = this.before;
				after  = this.after;
				this.view_after = after * 1000;
				this.view_before = before * 1000;

				this.requested_padding = null;
				points_multiplier = 1;
			}

			this.requested_after = after * 1000;
			this.requested_before = before * 1000;

			this.data_points = this.points || Math.round(this.chartWidth() / this.chartPixelsPerPoint());

			// build the data URL
			this.data_url = this.host + this.chart.data_url;
			this.data_url += "&format="  + this.library.format();
			this.data_url += "&points="  + (this.data_points * points_multiplier).toString();
			this.data_url += "&group="   + this.method;
			this.data_url += "&options=" + this.library.options(this);
			this.data_url += '|jsonwrap';

			if(NETDATA.options.current.eliminate_zero_dimensions === true)
				this.data_url += '|nonzero';

			if(this.append_options !== null)
				this.data_url += '|' + this.append_options.toString();

			if(after)
				this.data_url += "&after="  + after.toString();

			if(before)
				this.data_url += "&before=" + before.toString();

			if(this.dimensions)
				this.data_url += "&dimensions=" + this.dimensions;

			if(NETDATA.options.debug.chart_data_url === true || this.debug === true)
				this.log('chartURL(): ' + this.data_url + ' WxH:' + this.chartWidth() + 'x' + this.chartHeight() + ' points: ' + this.data_points + ' library: ' + this.library_name);
		};

		this.redrawChart = function() {
			if(this.data !== null)
				this.updateChartWithData(this.data);
		};

		this.updateChartWithData = function(data) {
			if(this.debug === true)
				this.log('updateChartWithData() called.');

			// this may force the chart to be re-created
			resizeChart();

			this.data = data;
			this.updates_counter++;
			this.updates_since_last_unhide++;
			this.updates_since_last_creation++;

			var started = new Date().getTime();

			// if the result is JSON, find the latest update-every
			this.data_update_every = data.view_update_every * 1000;
			this.data_after = data.after * 1000;
			this.data_before = data.before * 1000;
			this.netdata_first = data.first_entry * 1000;
			this.netdata_last = data.last_entry * 1000;
			this.data_points = data.points;
			data.state = this;

			if(NETDATA.options.current.pan_and_zoom_data_padding === true && this.requested_padding !== null) {
				if(this.view_after < this.data_after) {
					// console.log('adusting view_after from ' + this.view_after + ' to ' + this.data_after);
					this.view_after = this.data_after;
				}

				if(this.view_before > this.data_before) {
					// console.log('adusting view_before from ' + this.view_before + ' to ' + this.data_before);
					this.view_before = this.data_before;
				}
			}
			else {
				this.view_after = this.data_after;
				this.view_before = this.data_before;
			}

			if(this.debug === true) {
				this.log('UPDATE No ' + this.updates_counter + ' COMPLETED');

				if(this.current.force_after_ms)
					this.log('STATUS: forced    : ' + (this.current.force_after_ms / 1000).toString() + ' - ' + (this.current.force_before_ms / 1000).toString());
				else
					this.log('STATUS: forced    : unset');

				this.log('STATUS: requested : ' + (this.requested_after / 1000).toString() + ' - ' + (this.requested_before / 1000).toString());
				this.log('STATUS: downloaded: ' + (this.data_after / 1000).toString() + ' - ' + (this.data_before / 1000).toString());
				this.log('STATUS: rendered  : ' + (this.view_after / 1000).toString() + ' - ' + (this.view_before / 1000).toString());
				this.log('STATUS: points    : ' + (this.data_points).toString());
			}

			if(this.data_points === 0) {
				noDataToShow();
				return;
			}

			if(this.updates_since_last_creation >= this.library.max_updates_to_recreate()) {
				if(this.debug === true)
					this.log('max updates of ' + this.updates_since_last_creation.toString() + ' reached. Forcing re-generation.');

				this.chart_created = false;
			}

			// check and update the legend
			this.legendUpdateDOM();

			if(this.chart_created === true
				&& typeof this.library.update === 'function') {

				if(this.debug === true)
					this.log('updating chart...');

				if(callChartLibraryUpdateSafely(data) === false)
					return;
			}
			else {
				if(this.debug === true)
					this.log('creating chart...');

				if(callChartLibraryCreateSafely(data) === false)
					return;
			}
			hideMessage();
			this.legendShowLatestValues();
			if(this.selected === true)
				NETDATA.globalSelectionSync.stop();

			// update the performance counters
			var now = new Date().getTime();
			this.tm.last_updated = now;

			// don't update last_autorefreshed if this chart is
			// forced to be updated with global PanAndZoom
			if(NETDATA.globalPanAndZoom.isActive())
				this.tm.last_autorefreshed = 0;
			else {
				if(NETDATA.options.current.parallel_refresher === true && NETDATA.options.current.concurrent_refreshes === true)
					this.tm.last_autorefreshed = now - (now % this.data_update_every);
				else
					this.tm.last_autorefreshed = now;
			}

			this.refresh_dt_ms = now - started;
			NETDATA.options.auto_refresher_fast_weight += this.refresh_dt_ms;

			if(this.refresh_dt_element !== null)
				this.refresh_dt_element.innerHTML = this.refresh_dt_ms.toString();
		};

		this.updateChart = function(callback) {
			if(this.debug === true)
				this.log('updateChart() called.');

			if(this._updating === true) {
				if(this.debug === true)
					this.log('I am already updating...');

				if(typeof callback === 'function') callback();
				return false;
			}

			// due to late initialization of charts and libraries
			// we need to check this too
			if(this.enabled === false) {
				if(this.debug === true)
					this.log('I am not enabled');

				if(typeof callback === 'function') callback();
				return false;
			}

			if(canBeRendered() === false) {
				if(typeof callback === 'function') callback();
				return false;
			}

			if(this.chart === null) {
				this.getChart(function() { that.updateChart(callback); });
				return false;
			}

			if(this.library.initialized === false) {
				if(this.library.enabled === true) {
					this.library.initialize(function() { that.updateChart(callback); });
					return false;
				}
				else {
					error('chart library "' + this.library_name + '" is not available.');
					if(typeof callback === 'function') callback();
					return false;
				}
			}

			this.clearSelection();
			this.chartURL();

			if(this.debug === true)
				this.log('updating from ' + this.data_url);

			NETDATA.statistics.refreshes_total++;
			NETDATA.statistics.refreshes_active++;

			if(NETDATA.statistics.refreshes_active > NETDATA.statistics.refreshes_active_max)
				NETDATA.statistics.refreshes_active_max = NETDATA.statistics.refreshes_active;

			this._updating = true;

			this.xhr = $.ajax( {
				url: this.data_url,
				cache: false,
				async: true
			})
			.success(function(data) {
				if(that.debug === true)
					that.log('data received. updating chart.');

				that.updateChartWithData(data);
			})
			.fail(function() {
				error('data download failed for url: ' + that.data_url);
			})
			.always(function() {
				NETDATA.statistics.refreshes_active--;
				that._updating = false;
				if(typeof callback === 'function') callback();
			});

			return true;
		};

		this.isVisible = function(nocache) {
			if(typeof nocache === 'undefined')
				nocache = false;

			// this.log('last_visible_check: ' + this.tm.last_visible_check + ', last_page_scroll: ' + NETDATA.options.last_page_scroll);

			// caching - we do not evaluate the charts visibility
			// if the page has not been scrolled since the last check
			if(nocache === false && this.tm.last_visible_check > NETDATA.options.last_page_scroll)
				return this.___isVisible___;

			this.tm.last_visible_check = new Date().getTime();

			var wh = window.innerHeight;
			var x = this.element.getBoundingClientRect();
			var ret = 0;
			var tolerance = 0;

			if(x.width === 0 || x.height === 0) {
				hideChart();
				this.___isVisible___ = false;
				return this.___isVisible___;
			}

			if(x.top < 0 && -x.top > x.height) {
				// the chart is entirely above
				ret = -x.top - x.height;
			}
			else if(x.top > wh) {
				// the chart is entirely below
				ret = x.top - wh;
			}

			if(ret > tolerance) {
				// the chart is too far

				hideChart();
				this.___isVisible___ = false;
				return this.___isVisible___;
			}
			else {
				// the chart is inside or very close

				unhideChart();
				this.___isVisible___ = true;
				return this.___isVisible___;
			}
		};

		this.isAutoRefreshable = function() {
			return (this.current.autorefresh);
		};

		this.canBeAutoRefreshed = function() {
			var now = new Date().getTime();

			if(this.running === true) {
				if(this.debug === true)
					this.log('I am already running');

				return false;
			}

			if(this.enabled === false) {
				if(this.debug === true)
					this.log('I am not enabled');

				return false;
			}

			if(this.library === null || this.library.enabled === false) {
				error('charting library "' + this.library_name + '" is not available');
				if(this.debug === true)
					this.log('My chart library ' + this.library_name + ' is not available');

				return false;
			}

			if(this.isVisible() === false) {
				if(NETDATA.options.debug.visibility === true || this.debug === true)
					this.log('I am not visible');

				return false;
			}

			if(this.current.force_update_at !== 0 && this.current.force_update_at < now) {
				if(this.debug === true)
					this.log('timed force update detected - allowing this update');

				this.current.force_update_at = 0;
				return true;
			}

			if(this.isAutoRefreshable() === true) {
				// allow the first update, even if the page is not visible
				if(this.updates_counter && this.updates_since_last_unhide && NETDATA.options.page_is_visible === false) {
					if(NETDATA.options.debug.focus === true || this.debug === true)
						this.log('canBeAutoRefreshed(): page does not have focus');

					return false;
				}

				if(this.needsRecreation() === true) {
					if(this.debug === true)
						this.log('canBeAutoRefreshed(): needs re-creation.');

					return true;
				}

				// options valid only for autoRefresh()
				if(NETDATA.options.auto_refresher_stop_until === 0 || NETDATA.options.auto_refresher_stop_until < now) {
					if(NETDATA.globalPanAndZoom.isActive()) {
						if(NETDATA.globalPanAndZoom.shouldBeAutoRefreshed(this)) {
							if(this.debug === true)
								this.log('canBeAutoRefreshed(): global panning: I need an update.');

							return true;
						}
						else {
							if(this.debug === true)
								this.log('canBeAutoRefreshed(): global panning: I am already up to date.');

							return false;
						}
					}

					if(this.selected === true) {
						if(this.debug === true)
							this.log('canBeAutoRefreshed(): I have a selection in place.');

						return false;
					}

					if(this.paused === true) {
						if(this.debug === true)
							this.log('canBeAutoRefreshed(): I am paused.');

						return false;
					}

					if(now - this.tm.last_autorefreshed >= this.data_update_every) {
						if(this.debug === true)
							this.log('canBeAutoRefreshed(): It is time to update me.');

						return true;
					}
				}
			}

			return false;
		};

		this.autoRefresh = function(callback) {
			if(this.canBeAutoRefreshed() === true && this.running === false) {
				var state = this;

				state.running = true;
				state.updateChart(function() {
					state.running = false;

					if(typeof callback !== 'undefined')
						callback();
				});
			}
			else {
				if(typeof callback !== 'undefined')
					callback();
			}
		};

		this._defaultsFromDownloadedChart = function(chart) {
			this.chart = chart;
			this.chart_url = chart.url;
			this.data_update_every = chart.update_every * 1000;
			this.data_points = Math.round(this.chartWidth() / this.chartPixelsPerPoint());
			this.tm.last_info_downloaded = new Date().getTime();

			if(this.title === null)
				this.title = chart.title;

			if(this.units === null)
				this.units = chart.units;
		};

		// fetch the chart description from the netdata server
		this.getChart = function(callback) {
			this.chart = NETDATA.chartRegistry.get(this.host, this.id);
			if(this.chart) {
				this._defaultsFromDownloadedChart(this.chart);
				if(typeof callback === 'function') callback();
			}
			else {
				this.chart_url = "/api/v1/chart?chart=" + this.id;

				if(this.debug === true)
					this.log('downloading ' + this.chart_url);

				$.ajax( {
					url:  this.host + this.chart_url,
					cache: false,
					async: true
				})
				.done(function(chart) {
					chart.url = that.chart_url;
					that._defaultsFromDownloadedChart(chart);
					NETDATA.chartRegistry.add(that.host, that.id, chart);
				})
				.fail(function() {
					NETDATA.error(404, that.chart_url);
					error('chart not found on url "' + that.chart_url + '"');
				})
				.always(function() {
					if(typeof callback === 'function') callback();
				});
			}
		};

		// ============================================================================================================
		// INITIALIZATION

		init();
	};

	NETDATA.resetAllCharts = function(state) {
		// first clear the global selection sync
		// to make sure no chart is in selected state
		state.globalSelectionSyncStop();

		// there are 2 possibilities here
		// a. state is the global Pan and Zoom master
		// b. state is not the global Pan and Zoom master
		var master = true;
		if(NETDATA.globalPanAndZoom.isMaster(state) === false)
			master = false;

		// clear the global Pan and Zoom
		// this will also refresh the master
		// and unblock any charts currently mirroring the master
		NETDATA.globalPanAndZoom.clearMaster();

		// if we were not the master, reset our status too
		// this is required because most probably the mouse
		// is over this chart, blocking it from auto-refreshing
		if(master === false && (state.paused === true || state.selected === true))
			state.resetChart();
	};

	// get or create a chart state, given a DOM element
	NETDATA.chartState = function(element) {
		var state = $(element).data('netdata-state-object') || null;
		if(state === null) {
			state = new chartState(element);
			$(element).data('netdata-state-object', state);
		}
		return state;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Library functions

	// Load a script without jquery
	// This is used to load jquery - after it is loaded, we use jquery
	NETDATA._loadjQuery = function(callback) {
		if(typeof jQuery === 'undefined') {
			if(NETDATA.options.debug.main_loop === true)
				console.log('loading ' + NETDATA.jQuery);

			var script = document.createElement('script');
			script.type = 'text/javascript';
			script.async = true;
			script.src = NETDATA.jQuery;

			// script.onabort = onError;
			script.onerror = function(err, t) { NETDATA.error(101, NETDATA.jQuery); };
			if(typeof callback === "function")
				script.onload = callback;

			var s = document.getElementsByTagName('script')[0];
			s.parentNode.insertBefore(script, s);
		}
		else if(typeof callback === "function")
			callback();
	};

	NETDATA._loadCSS = function(filename) {
		// don't use jQuery here
		// styles are loaded before jQuery
		// to eliminate showing an unstyled page to the user

		var fileref = document.createElement("link");
		fileref.setAttribute("rel", "stylesheet");
		fileref.setAttribute("type", "text/css");
		fileref.setAttribute("href", filename);

		if (typeof fileref !== 'undefined')
			document.getElementsByTagName("head")[0].appendChild(fileref);
	};

	NETDATA.colorHex2Rgb = function(hex) {
		// Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
		var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
			hex = hex.replace(shorthandRegex, function(m, r, g, b) {
			return r + r + g + g + b + b;
		});

		var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
		return result ? {
			r: parseInt(result[1], 16),
			g: parseInt(result[2], 16),
			b: parseInt(result[3], 16)
		} : null;
	};

	NETDATA.colorLuminance = function(hex, lum) {
		// validate hex string
		hex = String(hex).replace(/[^0-9a-f]/gi, '');
		if (hex.length < 6)
			hex = hex[0]+hex[0]+hex[1]+hex[1]+hex[2]+hex[2];

		lum = lum || 0;

		// convert to decimal and change luminosity
		var rgb = "#", c, i;
		for (i = 0; i < 3; i++) {
			c = parseInt(hex.substr(i*2,2), 16);
			c = Math.round(Math.min(Math.max(0, c + (c * lum)), 255)).toString(16);
			rgb += ("00"+c).substr(c.length);
		}

		return rgb;
	};

	NETDATA.guid = function() {
		function s4() {
			return Math.floor((1 + Math.random()) * 0x10000)
					.toString(16)
					.substring(1);
			}

			return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4();
	};

	NETDATA.zeropad = function(x) {
		if(x > -10 && x < 10) return '0' + x.toString();
		else return x.toString();
	};

	// user function to signal us the DOM has been
	// updated.
	NETDATA.updatedDom = function() {
		NETDATA.options.updated_dom = true;
	};

	NETDATA.ready = function(callback) {
		NETDATA.options.pauseCallback = callback;
	};

	NETDATA.pause = function(callback) {
		if(NETDATA.options.pause === true)
			callback();
		else
			NETDATA.options.pauseCallback = callback;
	};

	NETDATA.unpause = function() {
		NETDATA.options.pauseCallback = null;
		NETDATA.options.updated_dom = true;
		NETDATA.options.pause = false;
	};

	// ----------------------------------------------------------------------------------------------------------------

	// this is purely sequencial charts refresher
	// it is meant to be autonomous
	NETDATA.chartRefresherNoParallel = function(index) {
		if(NETDATA.options.debug.mail_loop === true)
			console.log('NETDATA.chartRefresherNoParallel(' + index + ')');

		if(NETDATA.options.updated_dom === true) {
			// the dom has been updated
			// get the dom parts again
			NETDATA.parseDom(NETDATA.chartRefresher);
			return;
		}
		if(index >= NETDATA.options.targets.length) {
			if(NETDATA.options.debug.main_loop === true)
				console.log('waiting to restart main loop...');

			NETDATA.options.auto_refresher_fast_weight = 0;

			setTimeout(function() {
				NETDATA.chartRefresher();
			}, NETDATA.options.current.idle_between_loops);
		}
		else {
			var state = NETDATA.options.targets[index];

			if(NETDATA.options.auto_refresher_fast_weight < NETDATA.options.current.fast_render_timeframe) {
				if(NETDATA.options.debug.main_loop === true)
					console.log('fast rendering...');

				state.autoRefresh(function() {
					NETDATA.chartRefresherNoParallel(++index);
				});
			}
			else {
				if(NETDATA.options.debug.main_loop === true) console.log('waiting for next refresh...');
				NETDATA.options.auto_refresher_fast_weight = 0;

				setTimeout(function() {
					state.autoRefresh(function() {
						NETDATA.chartRefresherNoParallel(++index);
					});
				}, NETDATA.options.current.idle_between_charts);
			}
		}
	};

	// this is part of the parallel refresher
	// its cause is to refresh sequencially all the charts
	// that depend on chart library initialization
	// it will call the parallel refresher back
	// as soon as it sees a chart that its chart library
	// is initialized
	NETDATA.chartRefresher_uninitialized = function() {
		if(NETDATA.options.updated_dom === true) {
			// the dom has been updated
			// get the dom parts again
			NETDATA.parseDom(NETDATA.chartRefresher);
			return;
		}

		if(NETDATA.options.sequencial.length === 0)
			NETDATA.chartRefresher();
		else {
			var state = NETDATA.options.sequencial.pop();
			if(state.library.initialized === true)
				NETDATA.chartRefresher();
			else
				state.autoRefresh(NETDATA.chartRefresher_uninitialized);
		}
	};

	NETDATA.chartRefresherWaitTime = function() {
		return NETDATA.options.current.idle_parallel_loops;
	};

	// the default refresher
	// it will create 2 sets of charts:
	// - the ones that can be refreshed in parallel
	// - the ones that depend on something else
	// the first set will be executed in parallel
	// the second will be given to NETDATA.chartRefresher_uninitialized()
	NETDATA.chartRefresher = function() {
		if(NETDATA.options.pause === true) {
			// console.log('auto-refresher is paused');
			setTimeout(NETDATA.chartRefresher,
				NETDATA.chartRefresherWaitTime());
			return;
		}

		if(typeof NETDATA.options.pauseCallback === 'function') {
			// console.log('auto-refresher is calling pauseCallback');
			NETDATA.options.pause = true;
			NETDATA.options.pauseCallback();
			NETDATA.chartRefresher();
			return;
		}

		if(NETDATA.options.current.parallel_refresher === false) {
			NETDATA.chartRefresherNoParallel(0);
			return;
		}

		if(NETDATA.options.updated_dom === true) {
			// the dom has been updated
			// get the dom parts again
			NETDATA.parseDom(NETDATA.chartRefresher);
			return;
		}

		var parallel = new Array();
		var targets = NETDATA.options.targets;
		var len = targets.length;
		var state;
		while(len--) {
			state = targets[len];
			if(state.isVisible() === false || state.running === true)
				continue;

			if(state.library.initialized === false) {
				if(state.library.enabled === true) {
					state.library.initialize(NETDATA.chartRefresher);
					return;
				}
				else {
					state.error('chart library "' + state.library_name + '" is not enabled.');
				}
			}

			parallel.unshift(state);
		}

		if(parallel.length > 0) {
			// this will execute the jobs in parallel
			$(parallel).each(function() {
				this.autoRefresh();
			})
		}

		// run the next refresh iteration
		setTimeout(NETDATA.chartRefresher,
			NETDATA.chartRefresherWaitTime());
	};

	NETDATA.parseDom = function(callback) {
		NETDATA.options.last_page_scroll = new Date().getTime();
		NETDATA.options.updated_dom = false;

		var targets = $('div[data-netdata]'); //.filter(':visible');

		if(NETDATA.options.debug.main_loop === true)
			console.log('DOM updated - there are ' + targets.length + ' charts on page.');

		NETDATA.options.targets = new Array();
		var len = targets.length;
		while(len--) {
			// the initialization will take care of sizing
			// and the "loading..." message
			NETDATA.options.targets.push(NETDATA.chartState(targets[len]));
		}

		if(typeof callback === 'function') callback();
	};

	// this is the main function - where everything starts
	NETDATA.start = function() {
		// this should be called only once

		NETDATA.options.page_is_visible = true;

		$(window).blur(function() {
			if(NETDATA.options.current.stop_updates_when_focus_is_lost === true) {
				NETDATA.options.page_is_visible = false;
				if(NETDATA.options.debug.focus === true)
					console.log('Lost Focus!');
			}
		});

		$(window).focus(function() {
			if(NETDATA.options.current.stop_updates_when_focus_is_lost === true) {
				NETDATA.options.page_is_visible = true;
				if(NETDATA.options.debug.focus === true)
					console.log('Focus restored!');
			}
		});

		if(typeof document.hasFocus === 'function' && !document.hasFocus()) {
			if(NETDATA.options.current.stop_updates_when_focus_is_lost === true) {
				NETDATA.options.page_is_visible = false;
				if(NETDATA.options.debug.focus === true)
					console.log('Document has no focus!');
			}
		}

		// bootstrap tab switching
		$('a[data-toggle="tab"]').on('shown.bs.tab', NETDATA.onscroll);

		// bootstrap modal switching
		$('.modal').on('hidden.bs.modal', NETDATA.onscroll);
		$('.modal').on('shown.bs.modal', NETDATA.onscroll);

		// bootstrap collapse switching
		$('.collapse').on('hidden.bs.collapse', NETDATA.onscroll);
		$('.collapse').on('shown.bs.collapse', NETDATA.onscroll);

		NETDATA.parseDom(NETDATA.chartRefresher);

		// Registry initialization
		setTimeout(NETDATA.registry.init, 3000);
	};

	// ----------------------------------------------------------------------------------------------------------------
	// peity

	NETDATA.peityInitialize = function(callback) {
		if(typeof netdataNoPeitys === 'undefined' || !netdataNoPeitys) {
			$.ajax({
				url: NETDATA.peity_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('peity', NETDATA.peity_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.peity.enabled = false;
				NETDATA.error(100, NETDATA.peity_js);
			})
			.always(function() {
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.peity.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.peityChartUpdate = function(state, data) {
		state.peity_instance.innerHTML = data.result;

		if(state.peity_options.stroke !== state.chartColors()[0]) {
			state.peity_options.stroke = state.chartColors()[0];
			if(state.chart.chart_type === 'line')
				state.peity_options.fill = NETDATA.themes.current.background;
			else
				state.peity_options.fill = NETDATA.colorLuminance(state.chartColors()[0], NETDATA.chartDefaults.fill_luminance);
		}

		$(state.peity_instance).peity('line', state.peity_options);
		return true;
	};

	NETDATA.peityChartCreate = function(state, data) {
		state.peity_instance = document.createElement('div');
		state.element_chart.appendChild(state.peity_instance);

		var self = $(state.element);
		state.peity_options = {
			stroke: NETDATA.themes.current.foreground,
			strokeWidth: self.data('peity-strokewidth') || 1,
			width: state.chartWidth(),
			height: state.chartHeight(),
			fill: NETDATA.themes.current.foreground
		};

		NETDATA.peityChartUpdate(state, data);
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// sparkline

	NETDATA.sparklineInitialize = function(callback) {
		if(typeof netdataNoSparklines === 'undefined' || !netdataNoSparklines) {
			$.ajax({
				url: NETDATA.sparkline_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('sparkline', NETDATA.sparkline_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.sparkline.enabled = false;
				NETDATA.error(100, NETDATA.sparkline_js);
			})
			.always(function() {
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.sparkline.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.sparklineChartUpdate = function(state, data) {
		state.sparkline_options.width = state.chartWidth();
		state.sparkline_options.height = state.chartHeight();

		$(state.element_chart).sparkline(data.result, state.sparkline_options);
		return true;
	};

	NETDATA.sparklineChartCreate = function(state, data) {
		var self = $(state.element);
		var type = self.data('sparkline-type') || 'line';
		var lineColor = self.data('sparkline-linecolor') || state.chartColors()[0];
		var fillColor = self.data('sparkline-fillcolor') || (state.chart.chart_type === 'line')?NETDATA.themes.current.background:NETDATA.colorLuminance(lineColor, NETDATA.chartDefaults.fill_luminance);
		var chartRangeMin = self.data('sparkline-chartrangemin') || undefined;
		var chartRangeMax = self.data('sparkline-chartrangemax') || undefined;
		var composite = self.data('sparkline-composite') || undefined;
		var enableTagOptions = self.data('sparkline-enabletagoptions') || undefined;
		var tagOptionPrefix = self.data('sparkline-tagoptionprefix') || undefined;
		var tagValuesAttribute = self.data('sparkline-tagvaluesattribute') || undefined;
		var disableHiddenCheck = self.data('sparkline-disablehiddencheck') || undefined;
		var defaultPixelsPerValue = self.data('sparkline-defaultpixelspervalue') || undefined;
		var spotColor = self.data('sparkline-spotcolor') || undefined;
		var minSpotColor = self.data('sparkline-minspotcolor') || undefined;
		var maxSpotColor = self.data('sparkline-maxspotcolor') || undefined;
		var spotRadius = self.data('sparkline-spotradius') || undefined;
		var valueSpots = self.data('sparkline-valuespots') || undefined;
		var highlightSpotColor = self.data('sparkline-highlightspotcolor') || undefined;
		var highlightLineColor = self.data('sparkline-highlightlinecolor') || undefined;
		var lineWidth = self.data('sparkline-linewidth') || undefined;
		var normalRangeMin = self.data('sparkline-normalrangemin') || undefined;
		var normalRangeMax = self.data('sparkline-normalrangemax') || undefined;
		var drawNormalOnTop = self.data('sparkline-drawnormalontop') || undefined;
		var xvalues = self.data('sparkline-xvalues') || undefined;
		var chartRangeClip = self.data('sparkline-chartrangeclip') || undefined;
		var chartRangeMinX = self.data('sparkline-chartrangeminx') || undefined;
		var chartRangeMaxX = self.data('sparkline-chartrangemaxx') || undefined;
		var disableInteraction = self.data('sparkline-disableinteraction') || false;
		var disableTooltips = self.data('sparkline-disabletooltips') || false;
		var disableHighlight = self.data('sparkline-disablehighlight') || false;
		var highlightLighten = self.data('sparkline-highlightlighten') || 1.4;
		var highlightColor = self.data('sparkline-highlightcolor') || undefined;
		var tooltipContainer = self.data('sparkline-tooltipcontainer') || undefined;
		var tooltipClassname = self.data('sparkline-tooltipclassname') || undefined;
		var tooltipFormat = self.data('sparkline-tooltipformat') || undefined;
		var tooltipPrefix = self.data('sparkline-tooltipprefix') || undefined;
		var tooltipSuffix = self.data('sparkline-tooltipsuffix') || ' ' + state.units;
		var tooltipSkipNull = self.data('sparkline-tooltipskipnull') || true;
		var tooltipValueLookups = self.data('sparkline-tooltipvaluelookups') || undefined;
		var tooltipFormatFieldlist = self.data('sparkline-tooltipformatfieldlist') || undefined;
		var tooltipFormatFieldlistKey = self.data('sparkline-tooltipformatfieldlistkey') || undefined;
		var numberFormatter = self.data('sparkline-numberformatter') || function(n){ return n.toFixed(2); };
		var numberDigitGroupSep = self.data('sparkline-numberdigitgroupsep') || undefined;
		var numberDecimalMark = self.data('sparkline-numberdecimalmark') || undefined;
		var numberDigitGroupCount = self.data('sparkline-numberdigitgroupcount') || undefined;
		var animatedZooms = self.data('sparkline-animatedzooms') || false;

		state.sparkline_options = {
			type: type,
			lineColor: lineColor,
			fillColor: fillColor,
			chartRangeMin: chartRangeMin,
			chartRangeMax: chartRangeMax,
			composite: composite,
			enableTagOptions: enableTagOptions,
			tagOptionPrefix: tagOptionPrefix,
			tagValuesAttribute: tagValuesAttribute,
			disableHiddenCheck: disableHiddenCheck,
			defaultPixelsPerValue: defaultPixelsPerValue,
			spotColor: spotColor,
			minSpotColor: minSpotColor,
			maxSpotColor: maxSpotColor,
			spotRadius: spotRadius,
			valueSpots: valueSpots,
			highlightSpotColor: highlightSpotColor,
			highlightLineColor: highlightLineColor,
			lineWidth: lineWidth,
			normalRangeMin: normalRangeMin,
			normalRangeMax: normalRangeMax,
			drawNormalOnTop: drawNormalOnTop,
			xvalues: xvalues,
			chartRangeClip: chartRangeClip,
			chartRangeMinX: chartRangeMinX,
			chartRangeMaxX: chartRangeMaxX,
			disableInteraction: disableInteraction,
			disableTooltips: disableTooltips,
			disableHighlight: disableHighlight,
			highlightLighten: highlightLighten,
			highlightColor: highlightColor,
			tooltipContainer: tooltipContainer,
			tooltipClassname: tooltipClassname,
			tooltipChartTitle: state.title,
			tooltipFormat: tooltipFormat,
			tooltipPrefix: tooltipPrefix,
			tooltipSuffix: tooltipSuffix,
			tooltipSkipNull: tooltipSkipNull,
			tooltipValueLookups: tooltipValueLookups,
			tooltipFormatFieldlist: tooltipFormatFieldlist,
			tooltipFormatFieldlistKey: tooltipFormatFieldlistKey,
			numberFormatter: numberFormatter,
			numberDigitGroupSep: numberDigitGroupSep,
			numberDecimalMark: numberDecimalMark,
			numberDigitGroupCount: numberDigitGroupCount,
			animatedZooms: animatedZooms,
			width: state.chartWidth(),
			height: state.chartHeight()
		};

		$(state.element_chart).sparkline(data.result, state.sparkline_options);
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// dygraph

	NETDATA.dygraph = {
		smooth: false
	};

	NETDATA.dygraphToolboxPanAndZoom = function(state, after, before) {
		if(after < state.netdata_first)
			after = state.netdata_first;

		if(before > state.netdata_last)
			before = state.netdata_last;

		state.setMode('zoom');
		state.globalSelectionSyncStop();
		state.globalSelectionSyncDelay();
		state.dygraph_user_action = true;
		state.dygraph_force_zoom = true;
		state.updateChartPanOrZoom(after, before);
		NETDATA.globalPanAndZoom.setMaster(state, after, before);
	};

	NETDATA.dygraphSetSelection = function(state, t) {
		if(typeof state.dygraph_instance !== 'undefined') {
			var r = state.calculateRowForTime(t);
			if(r !== -1)
				state.dygraph_instance.setSelection(r);
			else {
				state.dygraph_instance.clearSelection();
				state.legendShowUndefined();
			}
		}

		return true;
	};

	NETDATA.dygraphClearSelection = function(state, t) {
		if(typeof state.dygraph_instance !== 'undefined') {
			state.dygraph_instance.clearSelection();
		}
		return true;
	};

	NETDATA.dygraphSmoothInitialize = function(callback) {
		$.ajax({
			url: NETDATA.dygraph_smooth_js,
			cache: true,
			dataType: "script"
		})
		.done(function() {
			NETDATA.dygraph.smooth = true;
			smoothPlotter.smoothing = 0.3;
		})
		.fail(function() {
			NETDATA.dygraph.smooth = false;
		})
		.always(function() {
			if(typeof callback === "function")
				callback();
		});
	};

	NETDATA.dygraphInitialize = function(callback) {
		if(typeof netdataNoDygraphs === 'undefined' || !netdataNoDygraphs) {
			$.ajax({
				url: NETDATA.dygraph_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('dygraph', NETDATA.dygraph_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.dygraph.enabled = false;
				NETDATA.error(100, NETDATA.dygraph_js);
			})
			.always(function() {
				if(NETDATA.chartLibraries.dygraph.enabled === true && NETDATA.options.current.smooth_plot === true)
					NETDATA.dygraphSmoothInitialize(callback);
				else if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.dygraph.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.dygraphChartUpdate = function(state, data) {
		var dygraph = state.dygraph_instance;

		if(typeof dygraph === 'undefined')
			return NETDATA.dygraphChartCreate(state, data);

		// when the chart is not visible, and hidden
		// if there is a window resize, dygraph detects
		// its element size as 0x0.
		// this will make it re-appear properly

		if(state.tm.last_unhidden > state.dygraph_last_rendered)
			dygraph.resize();

		var options = {
				file: data.result.data,
				colors: state.chartColors(),
				labels: data.result.labels,
				labelsDivWidth: state.chartWidth() - 70,
				visibility: state.dimensions_visibility.selected2BooleanArray(state.data.dimension_names)
		};

		if(state.dygraph_force_zoom === true) {
			if(NETDATA.options.debug.dygraph === true || state.debug === true)
				state.log('dygraphChartUpdate() forced zoom update');

			options.dateWindow = (state.requested_padding !== null)?[ state.view_after, state.view_before ]:null;
			options.valueRange = null;
			options.isZoomedIgnoreProgrammaticZoom = true;
			state.dygraph_force_zoom = false;
		}
		else if(state.current.name !== 'auto') {
			if(NETDATA.options.debug.dygraph === true || state.debug === true)
				state.log('dygraphChartUpdate() loose update');
		}
		else {
			if(NETDATA.options.debug.dygraph === true || state.debug === true)
				state.log('dygraphChartUpdate() strict update');

			options.dateWindow = (state.requested_padding !== null)?[ state.view_after, state.view_before ]:null;
			options.valueRange = null;
			options.isZoomedIgnoreProgrammaticZoom = true;
		}

		if(state.dygraph_smooth_eligible === true) {
			if((NETDATA.options.current.smooth_plot === true && state.dygraph_options.plotter !== smoothPlotter)
				|| (NETDATA.options.current.smooth_plot === false && state.dygraph_options.plotter === smoothPlotter)) {
				NETDATA.dygraphChartCreate(state, data);
				return;
			}
		}

		dygraph.updateOptions(options);

		state.dygraph_last_rendered = new Date().getTime();
		return true;
	};

	NETDATA.dygraphChartCreate = function(state, data) {
		if(NETDATA.options.debug.dygraph === true || state.debug === true)
			state.log('dygraphChartCreate()');

		var self = $(state.element);

		var chart_type = state.chart.chart_type;
		if(chart_type === 'stacked' && data.dimensions === 1) chart_type = 'area';
		chart_type = self.data('dygraph-type') || chart_type;

		var smooth = (chart_type === 'line' && !NETDATA.chartLibraries.dygraph.isSparkline(state))?true:false;
		smooth = self.data('dygraph-smooth') || smooth;

		if(NETDATA.dygraph.smooth === false)
			smooth = false;

		var strokeWidth = (chart_type === 'stacked')?0.1:((smooth)?1.5:0.7)
		var highlightCircleSize = (NETDATA.chartLibraries.dygraph.isSparkline(state))?3:4;

		state.dygraph_options = {
			colors: self.data('dygraph-colors') || state.chartColors(),

			// leave a few pixels empty on the right of the chart
			rightGap: self.data('dygraph-rightgap') || 5,
			showRangeSelector: self.data('dygraph-showrangeselector') || false,
			showRoller: self.data('dygraph-showroller') || false,

			title: self.data('dygraph-title') || state.title,
			titleHeight: self.data('dygraph-titleheight') || 19,

			legend: self.data('dygraph-legend') || 'always', // 'onmouseover',
			labels: data.result.labels,
			labelsDiv: self.data('dygraph-labelsdiv') || state.element_legend_childs.hidden,
			labelsDivStyles: self.data('dygraph-labelsdivstyles') || { 'fontSize':'1px' },
			labelsDivWidth: self.data('dygraph-labelsdivwidth') || state.chartWidth() - 70,
			labelsSeparateLines: self.data('dygraph-labelsseparatelines') || true,
			labelsShowZeroValues: self.data('dygraph-labelsshowzerovalues') || true,
			labelsKMB: false,
			labelsKMG2: false,
			showLabelsOnHighlight: self.data('dygraph-showlabelsonhighlight') || true,
			hideOverlayOnMouseOut: self.data('dygraph-hideoverlayonmouseout') || true,

			ylabel: state.units,
			yLabelWidth: self.data('dygraph-ylabelwidth') || 12,

			// the function to plot the chart
			plotter: null,

			// The width of the lines connecting data points. This can be used to increase the contrast or some graphs.
			strokeWidth: self.data('dygraph-strokewidth') || strokeWidth,
			strokePattern: self.data('dygraph-strokepattern') || undefined,

			// The size of the dot to draw on each point in pixels (see drawPoints). A dot is always drawn when a point is "isolated",
			// i.e. there is a missing point on either side of it. This also controls the size of those dots.
			drawPoints: self.data('dygraph-drawpoints') || false,

			// Draw points at the edges of gaps in the data. This improves visibility of small data segments or other data irregularities.
			drawGapEdgePoints: self.data('dygraph-drawgapedgepoints') || true,

			connectSeparatedPoints: self.data('dygraph-connectseparatedpoints') || false,
			pointSize: self.data('dygraph-pointsize') || 1,

			// enabling this makes the chart with little square lines
			stepPlot: self.data('dygraph-stepplot') || false,

			// Draw a border around graph lines to make crossing lines more easily distinguishable. Useful for graphs with many lines.
			strokeBorderColor: self.data('dygraph-strokebordercolor') || NETDATA.themes.current.background,
			strokeBorderWidth: self.data('dygraph-strokeborderwidth') || (chart_type === 'stacked')?0.0:0.0,

			fillGraph: self.data('dygraph-fillgraph') || (chart_type === 'area' || chart_type === 'stacked')?true:false,
			fillAlpha: self.data('dygraph-fillalpha') || (chart_type === 'stacked')?NETDATA.options.current.color_fill_opacity_stacked:NETDATA.options.current.color_fill_opacity_area,
			stackedGraph: self.data('dygraph-stackedgraph') || (chart_type === 'stacked')?true:false,
			stackedGraphNaNFill: self.data('dygraph-stackedgraphnanfill') || 'none',

			drawAxis: self.data('dygraph-drawaxis') || true,
			axisLabelFontSize: self.data('dygraph-axislabelfontsize') || 10,
			axisLineColor: self.data('dygraph-axislinecolor') || NETDATA.themes.current.axis,
			axisLineWidth: self.data('dygraph-axislinewidth') || 0.3,

			drawGrid: self.data('dygraph-drawgrid') || true,
			drawXGrid: self.data('dygraph-drawxgrid') || undefined,
			drawYGrid: self.data('dygraph-drawygrid') || undefined,
			gridLinePattern: self.data('dygraph-gridlinepattern') || null,
			gridLineWidth: self.data('dygraph-gridlinewidth') || 0.3,
			gridLineColor: self.data('dygraph-gridlinecolor') || NETDATA.themes.current.grid,

			maxNumberWidth: self.data('dygraph-maxnumberwidth') || 8,
			sigFigs: self.data('dygraph-sigfigs') || null,
			digitsAfterDecimal: self.data('dygraph-digitsafterdecimal') || 2,
			valueFormatter: self.data('dygraph-valueformatter') || function(x){ return x.toFixed(2); },

			highlightCircleSize: self.data('dygraph-highlightcirclesize') || highlightCircleSize,
			highlightSeriesOpts: self.data('dygraph-highlightseriesopts') || null, // TOO SLOW: { strokeWidth: 1.5 },
			highlightSeriesBackgroundAlpha: self.data('dygraph-highlightseriesbackgroundalpha') || null, // TOO SLOW: (chart_type === 'stacked')?0.7:0.5,

			pointClickCallback: self.data('dygraph-pointclickcallback') || undefined,
			visibility: state.dimensions_visibility.selected2BooleanArray(state.data.dimension_names),
			axes: {
				x: {
					pixelsPerLabel: 50,
					ticker: Dygraph.dateTicker,
					axisLabelFormatter: function (d, gran) {
						return NETDATA.zeropad(d.getHours()) + ":" + NETDATA.zeropad(d.getMinutes()) + ":" + NETDATA.zeropad(d.getSeconds());
					},
					valueFormatter: function (ms) {
						var d = new Date(ms);
						return d.toLocaleDateString() + ' ' + d.toLocaleTimeString();
						// return NETDATA.zeropad(d.getHours()) + ":" + NETDATA.zeropad(d.getMinutes()) + ":" + NETDATA.zeropad(d.getSeconds());
					}
				},
				y: {
					pixelsPerLabel: 15,
					valueFormatter: function (x) {
						// we format legends with the state object
						// no need to do anything here
						// return (Math.round(x*100) / 100).toLocaleString();
						// return state.legendFormatValue(x);
						return x;
					}
				}
			},
			legendFormatter: function(data) {
				var elements = state.element_legend_childs;

				// if the hidden div is not there
				// we are not managing the legend
				if(elements.hidden === null) return;

				if (typeof data.x !== 'undefined') {
					state.legendSetDate(data.x);
					var i = data.series.length;
					while(i--) {
						var series = data.series[i];
						if(!series.isVisible) continue;
						state.legendSetLabelValue(series.label, series.y);
					}
				}

				return '';
			},
			drawCallback: function(dygraph, is_initial) {
				if(state.current.name !== 'auto' && state.dygraph_user_action === true) {
					state.dygraph_user_action = false;

					var x_range = dygraph.xAxisRange();
					var after = Math.round(x_range[0]);
					var before = Math.round(x_range[1]);

					if(NETDATA.options.debug.dygraph === true)
						state.log('dygraphDrawCallback(dygraph, ' + is_initial + '): ' + (after / 1000).toString() + ' - ' + (before / 1000).toString());

					if(before <= state.netdata_last && after >= state.netdata_first)
						state.updateChartPanOrZoom(after, before);
				}
			},
			zoomCallback: function(minDate, maxDate, yRanges) {
				if(NETDATA.options.debug.dygraph === true)
					state.log('dygraphZoomCallback()');

				state.globalSelectionSyncStop();
				state.globalSelectionSyncDelay();
				state.setMode('zoom');

				// refresh it to the greatest possible zoom level
				state.dygraph_user_action = true;
				state.dygraph_force_zoom = true;
				state.updateChartPanOrZoom(minDate, maxDate);
			},
			highlightCallback: function(event, x, points, row, seriesName) {
				if(NETDATA.options.debug.dygraph === true || state.debug === true)
					state.log('dygraphHighlightCallback()');

				state.pauseChart();

				// there is a bug in dygraph when the chart is zoomed enough
				// the time it thinks is selected is wrong
				// here we calculate the time t based on the row number selected
				// which is ok
				var t = state.data_after + row * state.data_update_every;
				// console.log('row = ' + row + ', x = ' + x + ', t = ' + t + ' ' + ((t === x)?'SAME':(Math.abs(x-t)<=state.data_update_every)?'SIMILAR':'DIFFERENT') + ', rows in db: ' + state.data_points + ' visible(x) = ' + state.timeIsVisible(x) + ' visible(t) = ' + state.timeIsVisible(t) + ' r(x) = ' + state.calculateRowForTime(x) + ' r(t) = ' + state.calculateRowForTime(t) + ' range: ' + state.data_after + ' - ' + state.data_before + ' real: ' + state.data.after + ' - ' + state.data.before + ' every: ' + state.data_update_every);

				state.globalSelectionSync(x);

				// fix legend zIndex using the internal structures of dygraph legend module
				// this works, but it is a hack!
				// state.dygraph_instance.plugins_[0].plugin.legend_div_.style.zIndex = 10000;
			},
			unhighlightCallback: function(event) {
				if(NETDATA.options.debug.dygraph === true || state.debug === true)
					state.log('dygraphUnhighlightCallback()');

				state.unpauseChart();
				state.globalSelectionSyncStop();
			},
			interactionModel : {
				mousedown: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.mousedown()');

					state.dygraph_user_action = true;
					state.globalSelectionSyncStop();

					if(NETDATA.options.debug.dygraph === true)
						state.log('dygraphMouseDown()');

					// Right-click should not initiate a zoom.
					if(event.button && event.button === 2) return;

					context.initializeMouseDown(event, dygraph, context);

					if(event.button && event.button === 1) {
						if (event.altKey || event.shiftKey) {
							state.setMode('pan');
							state.globalSelectionSyncDelay();
							Dygraph.startPan(event, dygraph, context);
						}
						else {
							state.setMode('zoom');
							state.globalSelectionSyncDelay();
							Dygraph.startZoom(event, dygraph, context);
						}
					}
					else {
						if (event.altKey || event.shiftKey) {
							state.setMode('zoom');
							state.globalSelectionSyncDelay();
							Dygraph.startZoom(event, dygraph, context);
						}
						else {
							state.setMode('pan');
							state.globalSelectionSyncDelay();
							Dygraph.startPan(event, dygraph, context);
						}
					}
				},
				mousemove: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.mousemove()');

					if(context.isPanning) {
						state.dygraph_user_action = true;
						state.globalSelectionSyncStop();
						state.globalSelectionSyncDelay();
						state.setMode('pan');
						Dygraph.movePan(event, dygraph, context);
					}
					else if(context.isZooming) {
						state.dygraph_user_action = true;
						state.globalSelectionSyncStop();
						state.globalSelectionSyncDelay();
						state.setMode('zoom');
						Dygraph.moveZoom(event, dygraph, context);
					}
				},
				mouseup: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.mouseup()');

					if (context.isPanning) {
						state.dygraph_user_action = true;
						state.globalSelectionSyncDelay();
						Dygraph.endPan(event, dygraph, context);
					}
					else if (context.isZooming) {
						state.dygraph_user_action = true;
						state.globalSelectionSyncDelay();
						Dygraph.endZoom(event, dygraph, context);
					}
				},
				click: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.click()');

					event.preventDefault();
				},
				dblclick: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.dblclick()');
					NETDATA.resetAllCharts(state);
				},
				mousewheel: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.mousewheel()');

					// Take the offset of a mouse event on the dygraph canvas and
					// convert it to a pair of percentages from the bottom left.
					// (Not top left, bottom is where the lower value is.)
					function offsetToPercentage(g, offsetX, offsetY) {
						// This is calculating the pixel offset of the leftmost date.
						var xOffset = g.toDomCoords(g.xAxisRange()[0], null)[0];
						var yar0 = g.yAxisRange(0);

						// This is calculating the pixel of the higest value. (Top pixel)
						var yOffset = g.toDomCoords(null, yar0[1])[1];

						// x y w and h are relative to the corner of the drawing area,
						// so that the upper corner of the drawing area is (0, 0).
						var x = offsetX - xOffset;
						var y = offsetY - yOffset;

						// This is computing the rightmost pixel, effectively defining the
						// width.
						var w = g.toDomCoords(g.xAxisRange()[1], null)[0] - xOffset;

						// This is computing the lowest pixel, effectively defining the height.
						var h = g.toDomCoords(null, yar0[0])[1] - yOffset;

						// Percentage from the left.
						var xPct = w === 0 ? 0 : (x / w);
						// Percentage from the top.
						var yPct = h === 0 ? 0 : (y / h);

						// The (1-) part below changes it from "% distance down from the top"
						// to "% distance up from the bottom".
						return [xPct, (1-yPct)];
					}

					// Adjusts [x, y] toward each other by zoomInPercentage%
					// Split it so the left/bottom axis gets xBias/yBias of that change and
					// tight/top gets (1-xBias)/(1-yBias) of that change.
					//
					// If a bias is missing it splits it down the middle.
					function zoomRange(g, zoomInPercentage, xBias, yBias) {
						xBias = xBias || 0.5;
						yBias = yBias || 0.5;

						function adjustAxis(axis, zoomInPercentage, bias) {
							var delta = axis[1] - axis[0];
							var increment = delta * zoomInPercentage;
							var foo = [increment * bias, increment * (1-bias)];

							return [ axis[0] + foo[0], axis[1] - foo[1] ];
						}

						var yAxes = g.yAxisRanges();
						var newYAxes = [];
						for (var i = 0; i < yAxes.length; i++) {
							newYAxes[i] = adjustAxis(yAxes[i], zoomInPercentage, yBias);
						}

						return adjustAxis(g.xAxisRange(), zoomInPercentage, xBias);
					}

					if(event.altKey || event.shiftKey) {
						state.dygraph_user_action = true;

						state.globalSelectionSyncStop();
						state.globalSelectionSyncDelay();

						// http://dygraphs.com/gallery/interaction-api.js
						var normal = (event.detail) ? event.detail * -1 : event.wheelDelta / 40;
						var percentage = normal / 50;

						if (!(event.offsetX && event.offsetY)){
							event.offsetX = event.layerX - event.target.offsetLeft;
							event.offsetY = event.layerY - event.target.offsetTop;
						}

						var percentages = offsetToPercentage(dygraph, event.offsetX, event.offsetY);
						var xPct = percentages[0];
						var yPct = percentages[1];

						var new_x_range = zoomRange(dygraph, percentage, xPct, yPct);

						var after = new_x_range[0];
						var before = new_x_range[1];

						var first = state.netdata_first + state.data_update_every;
						var last = state.netdata_last + state.data_update_every;

						if(before > last) {
							after -= (before - last);
							before = last;
						}
						if(after < first) {
							after = first;
						}

						state.setMode('zoom');
						if(state.updateChartPanOrZoom(after, before) === true)
							dygraph.updateOptions({ dateWindow: [ after, before ] });

						event.preventDefault();
					}
				},
				touchstart: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.touchstart()');

					state.dygraph_user_action = true;
					state.setMode('zoom');
					state.pauseChart();

					Dygraph.defaultInteractionModel.touchstart(event, dygraph, context);

					// we overwrite the touch directions at the end, to overwrite
					// the internal default of dygraphs
					context.touchDirections = { x: true, y: false };

					state.dygraph_last_touch_start = new Date().getTime();
					state.dygraph_last_touch_move = 0;

					if(typeof event.touches[0].pageX === 'number')
						state.dygraph_last_touch_page_x = event.touches[0].pageX;
					else
						state.dygraph_last_touch_page_x = 0;
				},
				touchmove: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.touchmove()');

					state.dygraph_user_action = true;
					Dygraph.defaultInteractionModel.touchmove(event, dygraph, context);

					state.dygraph_last_touch_move = new Date().getTime();
				},
				touchend: function(event, dygraph, context) {
					if(NETDATA.options.debug.dygraph === true || state.debug === true)
						state.log('interactionModel.touchend()');

					state.dygraph_user_action = true;
					Dygraph.defaultInteractionModel.touchend(event, dygraph, context);

					// if it didn't move, it is a selection
					if(state.dygraph_last_touch_move === 0 && state.dygraph_last_touch_page_x !== 0) {
						// internal api of dygraphs
						var pct = (state.dygraph_last_touch_page_x - (dygraph.plotter_.area.x + state.element.getBoundingClientRect().left)) / dygraph.plotter_.area.w;
						var t = Math.round(state.data_after + (state.data_before - state.data_after) * pct);
						if(NETDATA.dygraphSetSelection(state, t) === true)
							state.globalSelectionSync(t);
					}

					// if it was double tap within double click time, reset the charts
					var now = new Date().getTime();
					if(typeof state.dygraph_last_touch_end !== 'undefined') {
						if(state.dygraph_last_touch_move === 0) {
							var dt = now - state.dygraph_last_touch_end;
							if(dt <= NETDATA.options.current.double_click_speed)
								NETDATA.resetAllCharts(state);
						}
					}

					// remember the timestamp of the last touch end
					state.dygraph_last_touch_end = now;
				}
			}
		};

		if(NETDATA.chartLibraries.dygraph.isSparkline(state)) {
			state.dygraph_options.drawGrid = false;
			state.dygraph_options.drawAxis = false;
			state.dygraph_options.title = undefined;
			state.dygraph_options.units = undefined;
			state.dygraph_options.ylabel = undefined;
			state.dygraph_options.yLabelWidth = 0;
			state.dygraph_options.labelsDivWidth = 120;
			state.dygraph_options.labelsDivStyles.width = '120px';
			state.dygraph_options.labelsSeparateLines = true;
			state.dygraph_options.rightGap = 0;
		}

		if(smooth === true) {
			state.dygraph_smooth_eligible = true;

			if(NETDATA.options.current.smooth_plot === true)
				state.dygraph_options.plotter = smoothPlotter;
		}
		else state.dygraph_smooth_eligible = false;

		state.dygraph_instance = new Dygraph(state.element_chart,
			data.result.data, state.dygraph_options);

		state.dygraph_force_zoom = false;
		state.dygraph_user_action = false;
		state.dygraph_last_rendered = new Date().getTime();
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// morris

	NETDATA.morrisInitialize = function(callback) {
		if(typeof netdataNoMorris === 'undefined' || !netdataNoMorris) {

			// morris requires raphael
			if(!NETDATA.chartLibraries.raphael.initialized) {
				if(NETDATA.chartLibraries.raphael.enabled) {
					NETDATA.raphaelInitialize(function() {
						NETDATA.morrisInitialize(callback);
					});
				}
				else {
					NETDATA.chartLibraries.morris.enabled = false;
					if(typeof callback === "function")
						callback();
				}
			}
			else {
				NETDATA._loadCSS(NETDATA.morris_css);

				$.ajax({
					url: NETDATA.morris_js,
					cache: true,
					dataType: "script"
				})
				.done(function() {
					NETDATA.registerChartLibrary('morris', NETDATA.morris_js);
				})
				.fail(function() {
					NETDATA.chartLibraries.morris.enabled = false;
					NETDATA.error(100, NETDATA.morris_js);
				})
				.always(function() {
					if(typeof callback === "function")
						callback();
				});
			}
		}
		else {
			NETDATA.chartLibraries.morris.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.morrisChartUpdate = function(state, data) {
		state.morris_instance.setData(data.result.data);
		return true;
	};

	NETDATA.morrisChartCreate = function(state, data) {

		state.morris_options = {
				element: state.element_chart.id,
				data: data.result.data,
				xkey: 'time',
				ykeys: data.dimension_names,
				labels: data.dimension_names,
				lineWidth: 2,
				pointSize: 3,
				smooth: true,
				hideHover: 'auto',
				parseTime: true,
				continuousLine: false,
				behaveLikeLine: false
		};

		if(state.chart.chart_type === 'line')
			state.morris_instance = new Morris.Line(state.morris_options);

		else if(state.chart.chart_type === 'area') {
			state.morris_options.behaveLikeLine = true;
			state.morris_instance = new Morris.Area(state.morris_options);
		}
		else // stacked
			state.morris_instance = new Morris.Area(state.morris_options);

		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// raphael

	NETDATA.raphaelInitialize = function(callback) {
		if(typeof netdataStopRaphael === 'undefined' || !netdataStopRaphael) {
			$.ajax({
				url: NETDATA.raphael_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('raphael', NETDATA.raphael_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.raphael.enabled = false;
				NETDATA.error(100, NETDATA.raphael_js);
			})
			.always(function() {
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.raphael.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.raphaelChartUpdate = function(state, data) {
		$(state.element_chart).raphael(data.result, {
			width: state.chartWidth(),
			height: state.chartHeight()
		});

		return false;
	};

	NETDATA.raphaelChartCreate = function(state, data) {
		$(state.element_chart).raphael(data.result, {
			width: state.chartWidth(),
			height: state.chartHeight()
		});

		return false;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// C3

	NETDATA.c3Initialize = function(callback) {
		if(typeof netdataNoC3 === 'undefined' || !netdataNoC3) {

			// C3 requires D3
			if(!NETDATA.chartLibraries.d3.initialized) {
				if(NETDATA.chartLibraries.d3.enabled) {
					NETDATA.d3Initialize(function() {
						NETDATA.c3Initialize(callback);
					});
				}
				else {
					NETDATA.chartLibraries.c3.enabled = false;
					if(typeof callback === "function")
						callback();
				}
			}
			else {
				NETDATA._loadCSS(NETDATA.c3_css);

				$.ajax({
					url: NETDATA.c3_js,
					cache: true,
					dataType: "script"
				})
				.done(function() {
					NETDATA.registerChartLibrary('c3', NETDATA.c3_js);
				})
				.fail(function() {
					NETDATA.chartLibraries.c3.enabled = false;
					NETDATA.error(100, NETDATA.c3_js);
				})
				.always(function() {
					if(typeof callback === "function")
						callback();
				});
			}
		}
		else {
			NETDATA.chartLibraries.c3.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.c3ChartUpdate = function(state, data) {
		state.c3_instance.destroy();
		return NETDATA.c3ChartCreate(state, data);

		//state.c3_instance.load({
		//	rows: data.result,
		//	unload: true
		//});

		//return true;
	};

	NETDATA.c3ChartCreate = function(state, data) {

		state.element_chart.id = 'c3-' + state.uuid;
		// console.log('id = ' + state.element_chart.id);

		state.c3_instance = c3.generate({
			bindto: '#' + state.element_chart.id,
			size: {
				width: state.chartWidth(),
				height: state.chartHeight()
			},
			color: {
				pattern: state.chartColors()
			},
			data: {
				x: 'time',
				rows: data.result,
				type: (state.chart.chart_type === 'line')?'spline':'area-spline'
			},
			axis: {
				x: {
					type: 'timeseries',
					tick: {
						format: function(x) {
							return NETDATA.zeropad(x.getHours()) + ":" + NETDATA.zeropad(x.getMinutes()) + ":" + NETDATA.zeropad(x.getSeconds());
						}
					}
				}
			},
			grid: {
				x: {
					show: true
				},
				y: {
					show: true
				}
			},
			point: {
				show: false
			},
			line: {
				connectNull: false
			},
			transition: {
				duration: 0
			},
			interaction: {
				enabled: true
			}
		});

		// console.log(state.c3_instance);

		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// D3

	NETDATA.d3Initialize = function(callback) {
		if(typeof netdataStopD3 === 'undefined' || !netdataStopD3) {
			$.ajax({
				url: NETDATA.d3_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('d3', NETDATA.d3_js);
			})
			.fail(function() {
				NETDATA.chartLibraries.d3.enabled = false;
				NETDATA.error(100, NETDATA.d3_js);
			})
			.always(function() {
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.d3.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.d3ChartUpdate = function(state, data) {
		return false;
	};

	NETDATA.d3ChartCreate = function(state, data) {
		return false;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// google charts

	NETDATA.googleInitialize = function(callback) {
		if(typeof netdataNoGoogleCharts === 'undefined' || !netdataNoGoogleCharts) {
			$.ajax({
				url: NETDATA.google_js,
				cache: true,
				dataType: "script"
			})
			.done(function() {
				NETDATA.registerChartLibrary('google', NETDATA.google_js);
				google.load('visualization', '1.1', {
					'packages': ['corechart', 'controls'],
					'callback': callback
				});
			})
			.fail(function() {
				NETDATA.chartLibraries.google.enabled = false;
				NETDATA.error(100, NETDATA.google_js);
				if(typeof callback === "function")
					callback();
			});
		}
		else {
			NETDATA.chartLibraries.google.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.googleChartUpdate = function(state, data) {
		var datatable = new google.visualization.DataTable(data.result);
		state.google_instance.draw(datatable, state.google_options);
		return true;
	};

	NETDATA.googleChartCreate = function(state, data) {
		var datatable = new google.visualization.DataTable(data.result);

		state.google_options = {
			colors: state.chartColors(),

			// do not set width, height - the chart resizes itself
			//width: state.chartWidth(),
			//height: state.chartHeight(),
			lineWidth: 1,
			title: state.title,
			fontSize: 11,
			hAxis: {
			//	title: "Time of Day",
			//	format:'HH:mm:ss',
				viewWindowMode: 'maximized',
				slantedText: false,
				format:'HH:mm:ss',
				textStyle: {
					fontSize: 9
				},
				gridlines: {
					color: '#EEE'
				}
			},
			vAxis: {
				title: state.units,
				viewWindowMode: 'pretty',
				minValue: -0.1,
				maxValue: 0.1,
				direction: 1,
				textStyle: {
					fontSize: 9
				},
				gridlines: {
					color: '#EEE'
				}
			},
			chartArea: {
				width: '65%',
				height: '80%'
			},
			focusTarget: 'category',
			annotation: {
				'1': {
					style: 'line'
				}
			},
			pointsVisible: 0,
			titlePosition: 'out',
			titleTextStyle: {
				fontSize: 11
			},
			tooltip: {
				isHtml: false,
				ignoreBounds: true,
				textStyle: {
					fontSize: 9
				}
			},
			curveType: 'function',
			areaOpacity: 0.3,
			isStacked: false
		};

		switch(state.chart.chart_type) {
			case "area":
				state.google_options.vAxis.viewWindowMode = 'maximized';
				state.google_options.areaOpacity = NETDATA.options.current.color_fill_opacity_area;
				state.google_instance = new google.visualization.AreaChart(state.element_chart);
				break;

			case "stacked":
				state.google_options.isStacked = true;
				state.google_options.areaOpacity = NETDATA.options.current.color_fill_opacity_stacked;
				state.google_options.vAxis.viewWindowMode = 'maximized';
				state.google_options.vAxis.minValue = null;
				state.google_options.vAxis.maxValue = null;
				state.google_instance = new google.visualization.AreaChart(state.element_chart);
				break;

			default:
			case "line":
				state.google_options.lineWidth = 2;
				state.google_instance = new google.visualization.LineChart(state.element_chart);
				break;
		}

		state.google_instance.draw(datatable, state.google_options);
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------

	NETDATA.percentFromValueMax = function(value, max) {
		if(value === null) value = 0;
		if(max < value) max = value;

		var pcent = 0;
		if(max !== 0) {
			pcent = Math.round(value * 100 / max);
			if(pcent === 0 && value > 0) pcent = 1;
		}

		return pcent;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// easy-pie-chart

	NETDATA.easypiechartInitialize = function(callback) {
		if(typeof netdataNoEasyPieChart === 'undefined' || !netdataNoEasyPieChart) {
			$.ajax({
				url: NETDATA.easypiechart_js,
				cache: true,
				dataType: "script"
			})
				.done(function() {
					NETDATA.registerChartLibrary('easypiechart', NETDATA.easypiechart_js);
				})
				.fail(function() {
					NETDATA.chartLibraries.easypiechart.enabled = false;
					NETDATA.error(100, NETDATA.easypiechart_js);
				})
				.always(function() {
					if(typeof callback === "function")
						callback();
				})
		}
		else {
			NETDATA.chartLibraries.easypiechart.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.easypiechartClearSelection = function(state) {
		if(typeof state.easyPieChartEvent !== 'undefined') {
			if(state.easyPieChartEvent.timer !== null)
				clearTimeout(state.easyPieChartEvent.timer);

			state.easyPieChartEvent.timer = null;
		}

		if(state.isAutoRefreshable() === true && state.data !== null) {
			NETDATA.easypiechartChartUpdate(state, state.data);
		}
		else {
			state.easyPieChartLabel.innerHTML = state.legendFormatValue(null);
			state.easyPieChart_instance.update(0);
		}
		state.easyPieChart_instance.enableAnimation();

		return true;
	};

	NETDATA.easypiechartSetSelection = function(state, t) {
		if(state.timeIsVisible(t) !== true)
			return NETDATA.easypiechartClearSelection(state);

		var slot = state.calculateRowForTime(t);
		if(slot < 0 || slot >= state.data.result.length)
			return NETDATA.easypiechartClearSelection(state);

		if(typeof state.easyPieChartEvent === 'undefined') {
			state.easyPieChartEvent = {
				timer: null,
				value: 0,
				pcent: 0
			};
		}

		var value = state.data.result[state.data.result.length - 1 - slot];
		var max = (state.easyPieChartMax === null)?state.data.max:state.easyPieChartMax;
		var pcent = NETDATA.percentFromValueMax(value, max);

		state.easyPieChartEvent.value = value;
		state.easyPieChartEvent.pcent = pcent;
		state.easyPieChartLabel.innerHTML = state.legendFormatValue(value);

		if(state.easyPieChartEvent.timer === null) {
			state.easyPieChart_instance.disableAnimation();

			state.easyPieChartEvent.timer = setTimeout(function() {
				state.easyPieChartEvent.timer = null;
				state.easyPieChart_instance.update(state.easyPieChartEvent.pcent);
			}, NETDATA.options.current.charts_selection_animation_delay);
		}

		return true;
	};

	NETDATA.easypiechartChartUpdate = function(state, data) {
		var value, max, pcent;

		if(NETDATA.globalPanAndZoom.isActive() === true || state.isAutoRefreshable() === false) {
			value = null;
			max = 0;
			pcent = 0;
		}
		else {
			value = data.result[0];
			max = (state.easyPieChartMax === null)?data.max:state.easyPieChartMax;
			pcent = NETDATA.percentFromValueMax(value, max);
		}

		state.easyPieChartLabel.innerHTML = state.legendFormatValue(value);
		state.easyPieChart_instance.update(pcent);
		return true;
	};

	NETDATA.easypiechartChartCreate = function(state, data) {
		var self = $(state.element);
		var chart = $(state.element_chart);

		var value = data.result[0];
		var max = self.data('easypiechart-max-value') || null;
		var adjust = self.data('easypiechart-adjust') || null;

		if(max === null) {
			max = data.max;
			state.easyPieChartMax = null;
		}
		else
			state.easyPieChartMax = max;

		var pcent = NETDATA.percentFromValueMax(value, max);

		chart.data('data-percent', pcent);

		var size;
		switch(adjust) {
			case 'width': size = state.chartHeight(); break;
			case 'min': size = Math.min(state.chartWidth(), state.chartHeight()); break;
			case 'max': size = Math.max(state.chartWidth(), state.chartHeight()); break;
			case 'height':
			default: size = state.chartWidth(); break;
		}
		state.element.style.width = size + 'px';
		state.element.style.height = size + 'px';

		var stroke = Math.floor(size / 22);
		if(stroke < 3) stroke = 2;

		var valuefontsize = Math.floor((size * 2 / 3) / 5);
		var valuetop = Math.round((size - valuefontsize - (size / 40)) / 2);
		state.easyPieChartLabel = document.createElement('span');
		state.easyPieChartLabel.className = 'easyPieChartLabel';
		state.easyPieChartLabel.innerHTML = state.legendFormatValue(value);
		state.easyPieChartLabel.style.fontSize = valuefontsize + 'px';
		state.easyPieChartLabel.style.top = valuetop.toString() + 'px';
		state.element_chart.appendChild(state.easyPieChartLabel);

		var titlefontsize = Math.round(valuefontsize * 1.6 / 3);
		var titletop = Math.round(valuetop - (titlefontsize * 2) - (size / 40));
		state.easyPieChartTitle = document.createElement('span');
		state.easyPieChartTitle.className = 'easyPieChartTitle';
		state.easyPieChartTitle.innerHTML = state.title;
		state.easyPieChartTitle.style.fontSize = titlefontsize + 'px';
		state.easyPieChartTitle.style.lineHeight = titlefontsize + 'px';
		state.easyPieChartTitle.style.top = titletop.toString() + 'px';
		state.element_chart.appendChild(state.easyPieChartTitle);

		var unitfontsize = Math.round(titlefontsize * 0.9);
		var unittop = Math.round(valuetop + (valuefontsize + unitfontsize) + (size / 40));
		state.easyPieChartUnits = document.createElement('span');
		state.easyPieChartUnits.className = 'easyPieChartUnits';
		state.easyPieChartUnits.innerHTML = state.units;
		state.easyPieChartUnits.style.fontSize = unitfontsize + 'px';
		state.easyPieChartUnits.style.top = unittop.toString() + 'px';
		state.element_chart.appendChild(state.easyPieChartUnits);

		chart.easyPieChart({
			barColor: self.data('easypiechart-barcolor') || state.chartColors()[0], //'#ef1e25',
			trackColor: self.data('easypiechart-trackcolor') || NETDATA.themes.current.easypiechart_track,
			scaleColor: self.data('easypiechart-scalecolor') || NETDATA.themes.current.easypiechart_scale,
			scaleLength: self.data('easypiechart-scalelength') || 5,
			lineCap: self.data('easypiechart-linecap') || 'round',
			lineWidth: self.data('easypiechart-linewidth') || stroke,
			trackWidth: self.data('easypiechart-trackwidth') || undefined,
			size: self.data('easypiechart-size') || size,
			rotate: self.data('easypiechart-rotate') || 0,
			animate: self.data('easypiechart-rotate') || {duration: 500, enabled: true},
			easing: self.data('easypiechart-easing') || undefined
		});

		// when we just re-create the chart
		// do not animate the first update
		var animate = true;
		if(typeof state.easyPieChart_instance !== 'undefined')
			animate = false;

		state.easyPieChart_instance = chart.data('easyPieChart');
		if(animate === false) state.easyPieChart_instance.disableAnimation();
		state.easyPieChart_instance.update(pcent);
		if(animate === false) state.easyPieChart_instance.enableAnimation();
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// gauge.js

	NETDATA.gaugeInitialize = function(callback) {
		if(typeof netdataNoGauge === 'undefined' || !netdataNoGauge) {
			$.ajax({
				url: NETDATA.gauge_js,
				cache: true,
				dataType: "script"
			})
				.done(function() {
					NETDATA.registerChartLibrary('gauge', NETDATA.gauge_js);
				})
				.fail(function() {
					NETDATA.chartLibraries.gauge.enabled = false;
					NETDATA.error(100, NETDATA.gauge_js);
				})
				.always(function() {
					if(typeof callback === "function")
						callback();
				})
		}
		else {
			NETDATA.chartLibraries.gauge.enabled = false;
			if(typeof callback === "function")
				callback();
		}
	};

	NETDATA.gaugeAnimation = function(state, status) {
		var speed = 32;

		if(typeof status === 'boolean' && status === false)
			speed = 1000000000;
		else if(typeof status === 'number')
			speed = status;

		state.gauge_instance.animationSpeed = speed;
		state.___gaugeOld__.speed = speed;
	};

	NETDATA.gaugeSet = function(state, value, min, max) {
		if(typeof value !== 'number') value = 0;
		if(typeof min !== 'number') min = 0;
		if(typeof max !== 'number') max = 0;
		if(value > max) max = value;
		if(value < min) min = value;
		if(min > max) {
			var t = min;
			min = max;
			max = t;
		}
		else if(min == max)
			max = min + 1;

		// gauge.js has an issue if the needle
		// is smaller than min or larger than max
		// when we set the new values
		// the needle will go crazy

		// to prevent it, we always feed it
		// with a percentage, so that the needle
		// is always between min and max
		var pcent = (value - min) * 100 / (max - min);

		// these should never happen
		if(pcent < 0) pcent = 0;
		if(pcent > 100) pcent = 100;

		state.gauge_instance.set(pcent);

		state.___gaugeOld__.value = value;
		state.___gaugeOld__.min = min;
		state.___gaugeOld__.max = max;
	};

	NETDATA.gaugeSetLabels = function(state, value, min, max) {
		if(state.___gaugeOld__.valueLabel !== value) {
			state.___gaugeOld__.valueLabel = value;
			state.gaugeChartLabel.innerHTML = state.legendFormatValue(value);
		}
		if(state.___gaugeOld__.minLabel !== min) {
			state.___gaugeOld__.minLabel = min;
			state.gaugeChartMin.innerHTML = state.legendFormatValue(min);
		}
		if(state.___gaugeOld__.maxLabel !== max) {
			state.___gaugeOld__.maxLabel = max;
			state.gaugeChartMax.innerHTML = state.legendFormatValue(max);
		}
	};

	NETDATA.gaugeClearSelection = function(state) {
		if(typeof state.gaugeEvent !== 'undefined') {
			if(state.gaugeEvent.timer !== null)
				clearTimeout(state.gaugeEvent.timer);

			state.gaugeEvent.timer = null;
		}

		if(state.isAutoRefreshable() === true && state.data !== null) {
			NETDATA.gaugeChartUpdate(state, state.data);
		}
		else {
			NETDATA.gaugeAnimation(state, false);
			NETDATA.gaugeSet(state, null, null, null);
			NETDATA.gaugeSetLabels(state, null, null, null);
		}

		NETDATA.gaugeAnimation(state, true);
		return true;
	};

	NETDATA.gaugeSetSelection = function(state, t) {
		if(state.timeIsVisible(t) !== true)
			return NETDATA.gaugeClearSelection(state);

		var slot = state.calculateRowForTime(t);
		if(slot < 0 || slot >= state.data.result.length)
			return NETDATA.gaugeClearSelection(state);

		if(typeof state.gaugeEvent === 'undefined') {
			state.gaugeEvent = {
				timer: null,
				value: 0,
				min: 0,
				max: 0
			};
		}

		var value = state.data.result[state.data.result.length - 1 - slot];
		var max = (state.gaugeMax === null)?state.data.max:state.gaugeMax;
		var min = 0;

		state.gaugeEvent.value = value;
		state.gaugeEvent.max = max;
		state.gaugeEvent.min = min;
		NETDATA.gaugeSetLabels(state, value, min, max);

		if(state.gaugeEvent.timer === null) {
			NETDATA.gaugeAnimation(state, false);

			state.gaugeEvent.timer = setTimeout(function() {
				state.gaugeEvent.timer = null;
				NETDATA.gaugeSet(state, state.gaugeEvent.value, state.gaugeEvent.min, state.gaugeEvent.max);
			}, NETDATA.options.current.charts_selection_animation_delay);
		}

		return true;
	};

	NETDATA.gaugeChartUpdate = function(state, data) {
		var value, min, max;

		if(NETDATA.globalPanAndZoom.isActive() === true || state.isAutoRefreshable() === false) {
			value = 0;
			min = 0;
			max = 1;
			NETDATA.gaugeSetLabels(state, null, null, null);
		}
		else {
			value = data.result[0];
			min = 0;
			max = (state.gaugeMax === null)?data.max:state.gaugeMax;
			if(value > max) max = value;
			NETDATA.gaugeSetLabels(state, value, min, max);
		}

		NETDATA.gaugeSet(state, value, min, max);
		return true;
	};

	NETDATA.gaugeChartCreate = function(state, data) {
		var self = $(state.element);
		// var chart = $(state.element_chart);

		var value = data.result[0];
		var max = self.data('gauge-max-value') || null;
		var adjust = self.data('gauge-adjust') || null;
		var pointerColor = self.data('gauge-pointer-color') || NETDATA.themes.current.gauge_pointer;
		var strokeColor = self.data('gauge-stroke-color') || NETDATA.themes.current.gauge_stroke;
		var startColor = self.data('gauge-start-color') || state.chartColors()[0];
		var stopColor = self.data('gauge-stop-color') || void 0;
		var generateGradient = self.data('gauge-generate-gradient') || false;

		if(max === null) {
			max = data.max;
			state.gaugeMax = null;
		}
		else
			state.gaugeMax = max;

		var width = state.chartWidth(), height = state.chartHeight(); //, ratio = 1.5;
		//switch(adjust) {
		//	case 'width': width = height * ratio; break;
		//	case 'height':
		//	default: height = width / ratio; break;
		//}
		//state.element.style.width = width.toString() + 'px';
		//state.element.style.height = height.toString() + 'px';

		var lum_d = 0.05;

		var options = {
			lines: 12,					// The number of lines to draw
			angle: 0.15,				// The length of each line
			lineWidth: 0.44,			// 0.44 The line thickness
			pointer: {
				length: 0.8,			// 0.9 The radius of the inner circle
				strokeWidth: 0.035,		// The rotation offset
				color: pointerColor		// Fill color
			},
			colorStart: startColor,		// Colors
			colorStop: stopColor,		// just experiment with them
			strokeColor: strokeColor,	// to see which ones work best for you
			limitMax: true,
			generateGradient: (generateGradient === true)?true:false,
			gradientType: 0
		};

		if (generateGradient.constructor === Array) {
			// example options:
			// data-gauge-generate-gradient="[0, 50, 100]"
			// data-gauge-gradient-percent-color-0="#FFFFFF"
			// data-gauge-gradient-percent-color-50="#999900"
			// data-gauge-gradient-percent-color-100="#000000"

			options.percentColors = new Array();
			var len = generateGradient.length;
			while(len--) {
				var pcent = generateGradient[len];
				var color = self.data('gauge-gradient-percent-color-' + pcent.toString()) || false;
				if(color !== false) {
					var a = new Array();
					a[0] = pcent / 100;
					a[1] = color;
					options.percentColors.unshift(a);
				}
			}
			if(options.percentColors.length === 0)
				delete options.percentColors;
		}
		else if(generateGradient === false && NETDATA.themes.current.gauge_gradient === true) {
			options.percentColors = [
				[0.0, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 0))],
				[0.1, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 1))],
				[0.2, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 2))],
				[0.3, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 3))],
				[0.4, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 4))],
				[0.5, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 5))],
				[0.6, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 6))],
				[0.7, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 7))],
				[0.8, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 8))],
				[0.9, NETDATA.colorLuminance(startColor, (lum_d * 10) - (lum_d * 9))],
				[1.0, NETDATA.colorLuminance(startColor, 0.0)]];
		}

		state.gauge_canvas = document.createElement('canvas');
		state.gauge_canvas.id = 'gauge-' + state.uuid + '-canvas';
		state.gauge_canvas.className = 'gaugeChart';
		state.gauge_canvas.width  = width;
		state.gauge_canvas.height = height;
		state.element_chart.appendChild(state.gauge_canvas);

		var valuefontsize = Math.floor(height / 6);
		var valuetop = Math.round((height - valuefontsize - (height / 6)) / 2);
		state.gaugeChartLabel = document.createElement('span');
		state.gaugeChartLabel.className = 'gaugeChartLabel';
		state.gaugeChartLabel.style.fontSize = valuefontsize + 'px';
		state.gaugeChartLabel.style.top = valuetop.toString() + 'px';
		state.element_chart.appendChild(state.gaugeChartLabel);

		var titlefontsize = Math.round(valuefontsize / 2);
		var titletop = 0;
		state.gaugeChartTitle = document.createElement('span');
		state.gaugeChartTitle.className = 'gaugeChartTitle';
		state.gaugeChartTitle.innerHTML = state.title;
		state.gaugeChartTitle.style.fontSize = titlefontsize + 'px';
		state.gaugeChartTitle.style.lineHeight = titlefontsize + 'px';
		state.gaugeChartTitle.style.top = titletop.toString() + 'px';
		state.element_chart.appendChild(state.gaugeChartTitle);

		var unitfontsize = Math.round(titlefontsize * 0.9);
		state.gaugeChartUnits = document.createElement('span');
		state.gaugeChartUnits.className = 'gaugeChartUnits';
		state.gaugeChartUnits.innerHTML = state.units;
		state.gaugeChartUnits.style.fontSize = unitfontsize + 'px';
		state.element_chart.appendChild(state.gaugeChartUnits);

		state.gaugeChartMin = document.createElement('span');
		state.gaugeChartMin.className = 'gaugeChartMin';
		state.gaugeChartMin.style.fontSize = Math.round(valuefontsize * 0.75).toString() + 'px';
		state.element_chart.appendChild(state.gaugeChartMin);

		state.gaugeChartMax = document.createElement('span');
		state.gaugeChartMax.className = 'gaugeChartMax';
		state.gaugeChartMax.style.fontSize = Math.round(valuefontsize * 0.75).toString() + 'px';
		state.element_chart.appendChild(state.gaugeChartMax);

		// when we just re-create the chart
		// do not animate the first update
		var animate = true;
		if(typeof state.gauge_instance !== 'undefined')
			animate = false;

		state.gauge_instance = new Gauge(state.gauge_canvas).setOptions(options); // create sexy gauge!

		state.___gaugeOld__ = {
			value: value,
			min: 0,
			max: max,
			valueLabel: null,
			minLabel: null,
			maxLabel: null
		};

		// we will always feed a percentage
		state.gauge_instance.minValue = 0;
		state.gauge_instance.maxValue = 100;

		NETDATA.gaugeAnimation(state, animate);
		NETDATA.gaugeSet(state, value, 0, max);
		NETDATA.gaugeSetLabels(state, value, 0, max);
		NETDATA.gaugeAnimation(state, true);
		return true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Charts Libraries Registration

	NETDATA.chartLibraries = {
		"dygraph": {
			initialize: NETDATA.dygraphInitialize,
			create: NETDATA.dygraphChartCreate,
			update: NETDATA.dygraphChartUpdate,
			resize: function(state) {
				if(typeof state.dygraph_instance.resize === 'function')
					state.dygraph_instance.resize();
			},
			setSelection: NETDATA.dygraphSetSelection,
			clearSelection:  NETDATA.dygraphClearSelection,
			toolboxPanAndZoom: NETDATA.dygraphToolboxPanAndZoom,
			initialized: false,
			enabled: true,
			format: function(state) { return 'json'; },
			options: function(state) { return 'ms|flip'; },
			legend: function(state) {
				if(this.isSparkline(state) === false)
					return 'right-side';
				else
					return null;
			},
			autoresize: function(state) { return true; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return true; },
			pixels_per_point: function(state) {
				if(this.isSparkline(state) === false)
					return 3;
				else
					return 2;
			},

			isSparkline: function(state) {
				if(typeof state.dygraph_sparkline === 'undefined') {
					var t = $(state.element).data('dygraph-theme');
					if(t === 'sparkline')
						state.dygraph_sparkline = true;
					else
						state.dygraph_sparkline = false;
				}
				return state.dygraph_sparkline;
			}
		},
		"sparkline": {
			initialize: NETDATA.sparklineInitialize,
			create: NETDATA.sparklineChartCreate,
			update: NETDATA.sparklineChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			toolboxPanAndZoom: null,
			initialized: false,
			enabled: true,
			format: function(state) { return 'array'; },
			options: function(state) { return 'flip|abs'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 3; }
		},
		"peity": {
			initialize: NETDATA.peityInitialize,
			create: NETDATA.peityChartCreate,
			update: NETDATA.peityChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			toolboxPanAndZoom: null,
			initialized: false,
			enabled: true,
			format: function(state) { return 'ssvcomma'; },
			options: function(state) { return 'null2zero|flip|abs'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 3; }
		},
		"morris": {
			initialize: NETDATA.morrisInitialize,
			create: NETDATA.morrisChartCreate,
			update: NETDATA.morrisChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			toolboxPanAndZoom: null,
			initialized: false,
			enabled: true,
			format: function(state) { return 'json'; },
			options: function(state) { return 'objectrows|ms'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 50; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 15; }
		},
		"google": {
			initialize: NETDATA.googleInitialize,
			create: NETDATA.googleChartCreate,
			update: NETDATA.googleChartUpdate,
			resize: null,
			setSelection: undefined, //function(state, t) { return true; },
			clearSelection: undefined, //function(state) { return true; },
			toolboxPanAndZoom: null,
			initialized: false,
			enabled: true,
			format: function(state) { return 'datatable'; },
			options: function(state) { return ''; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 300; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 4; }
		},
		"raphael": {
			initialize: NETDATA.raphaelInitialize,
			create: NETDATA.raphaelChartCreate,
			update: NETDATA.raphaelChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			toolboxPanAndZoom: null,
			initialized: false,
			enabled: true,
			format: function(state) { return 'json'; },
			options: function(state) { return ''; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 3; }
		},
		"c3": {
			initialize: NETDATA.c3Initialize,
			create: NETDATA.c3ChartCreate,
			update: NETDATA.c3ChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			toolboxPanAndZoom: null,
			initialized: false,
			enabled: true,
			format: function(state) { return 'csvjsonarray'; },
			options: function(state) { return 'milliseconds'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 15; }
		},
		"d3": {
			initialize: NETDATA.d3Initialize,
			create: NETDATA.d3ChartCreate,
			update: NETDATA.d3ChartUpdate,
			resize: null,
			setSelection: undefined, // function(state, t) { return true; },
			clearSelection: undefined, // function(state) { return true; },
			toolboxPanAndZoom: null,
			initialized: false,
			enabled: true,
			format: function(state) { return 'json'; },
			options: function(state) { return ''; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return false; },
			pixels_per_point: function(state) { return 3; }
		},
		"easypiechart": {
			initialize: NETDATA.easypiechartInitialize,
			create: NETDATA.easypiechartChartCreate,
			update: NETDATA.easypiechartChartUpdate,
			resize: null,
			setSelection: NETDATA.easypiechartSetSelection,
			clearSelection: NETDATA.easypiechartClearSelection,
			toolboxPanAndZoom: null,
			initialized: false,
			enabled: true,
			format: function(state) { return 'array'; },
			options: function(state) { return 'absolute'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return true; },
			pixels_per_point: function(state) { return 3; },
			aspect_ratio: 100
		},
		"gauge": {
			initialize: NETDATA.gaugeInitialize,
			create: NETDATA.gaugeChartCreate,
			update: NETDATA.gaugeChartUpdate,
			resize: null,
			setSelection: NETDATA.gaugeSetSelection,
			clearSelection: NETDATA.gaugeClearSelection,
			toolboxPanAndZoom: null,
			initialized: false,
			enabled: true,
			format: function(state) { return 'array'; },
			options: function(state) { return 'absolute'; },
			legend: function(state) { return null; },
			autoresize: function(state) { return false; },
			max_updates_to_recreate: function(state) { return 5000; },
			track_colors: function(state) { return true; },
			pixels_per_point: function(state) { return 3; },
			aspect_ratio: 70
		}
	};

	NETDATA.registerChartLibrary = function(library, url) {
		if(NETDATA.options.debug.libraries === true)
			console.log("registering chart library: " + library);

		NETDATA.chartLibraries[library].url = url;
		NETDATA.chartLibraries[library].initialized = true;
		NETDATA.chartLibraries[library].enabled = true;
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Load required JS libraries and CSS

	NETDATA.requiredJs = [
		{
			url: NETDATA.serverDefault + 'lib/bootstrap.min.js',
			isAlreadyLoaded: function() {
				// check if bootstrap is loaded
				if(typeof $().emulateTransitionEnd == 'function')
					return true;
				else {
					if(typeof netdataNoBootstrap !== 'undefined' && netdataNoBootstrap)
						return true;
					else
						return false;
				}
			}
		},
		{
			url: NETDATA.serverDefault + 'lib/jquery.nanoscroller.min.js',
			isAlreadyLoaded: function() { return false; }
		},
		{
			url: NETDATA.serverDefault + 'lib/bootstrap-toggle.min.js',
			isAlreadyLoaded: function() { return false; }
		}
	];

	NETDATA.requiredCSS = [
		{
			url: NETDATA.themes.current.bootstrap_css,
			isAlreadyLoaded: function() {
				if(typeof netdataNoBootstrap !== 'undefined' && netdataNoBootstrap)
					return true;
				else
					return false;
			}
		},
		{
			url: NETDATA.serverDefault + 'css/font-awesome.min.css',
			isAlreadyLoaded: function() { return false; }
		},
		{
			url: NETDATA.themes.current.dashboard_css,
			isAlreadyLoaded: function() { return false; }
		},
		{
			url: NETDATA.serverDefault + 'css/bootstrap-toggle.min.css',
			isAlreadyLoaded: function() { return false; }
		}
	];

	NETDATA.loadRequiredJs = function(index, callback) {
		if(index >= NETDATA.requiredJs.length)  {
			if(typeof callback === 'function')
				callback();
			return;
		}

		if(NETDATA.requiredJs[index].isAlreadyLoaded()) {
			NETDATA.loadRequiredJs(++index, callback);
			return;
		}

		if(NETDATA.options.debug.main_loop === true)
			console.log('loading ' + NETDATA.requiredJs[index].url);

		$.ajax({
			url: NETDATA.requiredJs[index].url,
			cache: true,
			dataType: "script"
		})
		.success(function() {
			if(NETDATA.options.debug.main_loop === true)
				console.log('loaded ' + NETDATA.requiredJs[index].url);

			NETDATA.loadRequiredJs(++index, callback);
		})
		.fail(function() {
			alert('Cannot load required JS library: ' + NETDATA.requiredJs[index].url);
		})
	};

	NETDATA.loadRequiredCSS = function(index) {
		if(index >= NETDATA.requiredCSS.length)
			return;

		if(NETDATA.requiredCSS[index].isAlreadyLoaded()) {
			NETDATA.loadRequiredCSS(++index);
			return;
		}

		if(NETDATA.options.debug.main_loop === true)
			console.log('loading ' + NETDATA.requiredCSS[index].url);

		NETDATA._loadCSS(NETDATA.requiredCSS[index].url);
		NETDATA.loadRequiredCSS(++index);
	};


	// ----------------------------------------------------------------------------------------------------------------
	// Registry of netdata hosts

	NETDATA.registry = {
		server: null,		// the netdata registry server
		person_guid: null,	// the unique ID of this browser / user
		machine_guid: null,	// the unique ID the netdata server that served dashboard.js
		hostname: null,		// the hostname of the netdata server that served dashboard.js
		urls: null,			// the user's other URLs
		urls_array: null,	// the user's other URLs in an array

		parsePersonUrls: function(person_urls) {
			// console.log(person_urls);

			if(person_urls) {
				NETDATA.registry.urls = {};
				NETDATA.registry.urls_array = new Array();

				var now = new Date().getTime();
				var apu = person_urls;
				var i = apu.length;
				while(i--) {
					if(typeof NETDATA.registry.urls[apu[i][0]] === 'undefined') {
						// console.log('adding: ' + apu[i][4] + ', ' + ((now - apu[i][2]) / 1000).toString());

						var obj = {
							guid: apu[i][0],
							url: apu[i][1],
							last_t: apu[i][2],
							accesses: apu[i][3],
							name: apu[i][4],
							alternate_urls: new Array()
						};

						NETDATA.registry.urls[apu[i][0]] = obj;
						NETDATA.registry.urls_array.push(obj);
					}
					else {
						// console.log('appending: ' + apu[i][4] + ', ' + ((now - apu[i][2]) / 1000).toString());

						var pu = NETDATA.registry.urls[apu[i][0]];
						if(pu.last_t < apu[i][2]) {
							pu.url = apu[i][1];
							pu.last_t = apu[i][2];
							pu.name = apu[i][4];
						}
						pu.accesses += apu[i][3];
						pu.alternate_urls.push(apu[i][1]);
					}
				}
			}

			if(typeof netdataRegistryCallback === 'function')
				netdataRegistryCallback(NETDATA.registry.urls_array);
		},

		init: function() {
			if(typeof netdataNoRegistry !== 'undefined' && netdataNoRegistry)
				return;

			NETDATA.registry.hello(NETDATA.serverDefault, function(data) {
				if(data) {
					NETDATA.registry.server = data.registry;
					NETDATA.registry.machine_guid = data.machine_guid;
					NETDATA.registry.hostname = data.hostname;

					NETDATA.registry.access(10, function (person_urls) {
						NETDATA.registry.parsePersonUrls(person_urls);

					});
				}
			});
		},

		hello: function(host, callback) {
			// send HELLO to a netdata server:
			// 1. verifies the server is reachable
			// 2. responds with the registry URL, the machine GUID of this netdata server and its hostname
			$.ajax({
					url: host + '/api/v1/registry?action=hello',
					async: true,
					cache: false,
					xhrFields: { withCredentials: true } // required for the cookie
				})
				.done(function(data) {
					if(typeof data.status !== 'string' || data.status !== 'ok') {
						NETDATA.error(408, host + ' response: ' + JSON.stringify(data));
						data = null;
					}

					if(typeof callback === 'function')
						callback(data);
				})
				.fail(function() {
					NETDATA.error(407, host);

					if(typeof callback === 'function')
						callback(null);
				});
		},

		access: function(max_redirects, callback) {
			// send ACCESS to a netdata registry:
			// 1. it lets it know we are accessing a netdata server (its machine GUID and its URL)
			// 2. it responds with a list of netdata servers we know
			// the registry identifies us using a cookie it sets the first time we access it
			// the registry may respond with a redirect URL to send us to another registry
			$.ajax({
					url: NETDATA.registry.server + '/api/v1/registry?action=access&machine=' + NETDATA.registry.machine_guid + '&name=' + encodeURIComponent(NETDATA.registry.hostname) + '&url=' + encodeURIComponent(NETDATA.serverDefault), // + '&visible_url=' + encodeURIComponent(document.location),
					async: true,
					cache: false,
					xhrFields: { withCredentials: true } // required for the cookie
				})
				.done(function(data) {
					var redirect = null;
					if(typeof data.registry === 'string')
						redirect = data.registry;

					if(typeof data.status !== 'string' || data.status !== 'ok') {
						NETDATA.error(409, NETDATA.registry.server + ' responded with: ' + JSON.stringify(data));
						data = null;
					}

					if(data === null && redirect !== null && max_redirects > 0) {
						NETDATA.registry.server = redirect;
						NETDATA.registry.access(max_redirects - 1, callback);
					}
					else {
						if(typeof data.person_guid === 'string')
							NETDATA.registry.person_guid = data.person_guid;

						if(typeof callback === 'function')
							callback(data.urls);
					}
				})
				.fail(function() {
					NETDATA.error(410, NETDATA.registry.server);

					if(typeof callback === 'function')
						callback(null);
				});
		},

		delete: function(delete_url, callback) {
			// send DELETE to a netdata registry:
			$.ajax({
				url: NETDATA.registry.server + '/api/v1/registry?action=delete&machine=' + NETDATA.registry.machine_guid + '&name=' + encodeURIComponent(NETDATA.registry.hostname) + '&url=' + encodeURIComponent(NETDATA.serverDefault) + '&delete_url=' + encodeURIComponent(delete_url),
				async: true,
				cache: false,
				xhrFields: { withCredentials: true } // required for the cookie
			})
				.done(function(data) {
					if(typeof data.status !== 'string' || data.status !== 'ok') {
						NETDATA.error(411, NETDATA.registry.server + ' responded with: ' + JSON.stringify(data));
						data = null;
					}

					if(typeof callback === 'function')
						callback(data);
				})
				.fail(function() {
					NETDATA.error(412, NETDATA.registry.server);

					if(typeof callback === 'function')
						callback(null);
				});
		},
		
		switch: function(new_person_guid, callback) {
			// impersonate
			$.ajax({
				url: NETDATA.registry.server + '/api/v1/registry?action=switch&machine=' + NETDATA.registry.machine_guid + '&name=' + encodeURIComponent(NETDATA.registry.hostname) + '&url=' + encodeURIComponent(NETDATA.serverDefault) + '&to=' + new_person_guid,
				async: true,
				cache: false,
				xhrFields: { withCredentials: true } // required for the cookie
			})
				.done(function(data) {
					if(typeof data.status !== 'string' || data.status !== 'ok') {
						NETDATA.error(413, NETDATA.registry.server + ' responded with: ' + JSON.stringify(data));
						data = null;
					}

					if(typeof callback === 'function')
						callback(data);
				})
				.fail(function() {
					NETDATA.error(414, NETDATA.registry.server);

					if(typeof callback === 'function')
						callback(null);
				});
		}
	};

	// ----------------------------------------------------------------------------------------------------------------
	// Boot it!

	NETDATA.errorReset();
	NETDATA.loadRequiredCSS(0);

	NETDATA._loadjQuery(function() {
		NETDATA.loadRequiredJs(0, function() {
			if(typeof $().emulateTransitionEnd !== 'function') {
				// bootstrap is not available
				NETDATA.options.current.show_help = false;
			}

			if(typeof netdataDontStart === 'undefined' || !netdataDontStart) {
				if(NETDATA.options.debug.main_loop === true)
					console.log('starting chart refresh thread');

				NETDATA.start();
			}
		});
	});

	// window.NETDATA = NETDATA;
// })(window, document);