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/*global qs, qsa, $on, $parent, $delegate */
(function (window) {
'use strict';
/**
* View that abstracts away the browser's DOM completely.
* It has two simple entry points:
*
* - bind(eventName, handler)
* Takes a todo application event and registers the handler
* - render(command, parameterObject)
* Renders the given command with the options
*/
function View(template) {
this.template = template;
this.ENTER_KEY = 13;
this.ESCAPE_KEY = 27;
this.$todoList = qs('.todo-list');
this.$todoItemCounter = qs('.todo-count');
this.$clearCompleted = qs('.clear-completed');
this.$main = qs('.main');
this.$footer = qs('.footer');
this.$toggleAll = qs('.toggle-all');
this.$newTodo = qs('.new-todo');
}
View.prototype._removeItem = function (id) {
var elem = qs('[data-id="' + id + '"]');
if (elem) {
this.$todoList.removeChild(elem);
}
};
View.prototype._clearCompletedButton = function (completedCount, visible) {
this.$clearCompleted.innerHTML = this.template.clearCompletedButton(completedCount);
this.$clearCompleted.style.display = visible ? 'block' : 'none';
};
View.prototype._setFilter = function (currentPage) {
qs('.filters .selected').className = '';
qs('.filters [href="#/' + currentPage + '"]').className = 'selected';
};
View.prototype._elementComplete = function (id, completed) {
var listItem = qs('[data-id="' + id + '"]');
if (!listItem) {
return;
}
listItem.className = completed ? 'completed' : '';
// In case it was toggled from an event and not by clicking the checkbox
qs('input', listItem).checked = completed;
};
View.prototype._editItem = function (id, title) {
var listItem = qs('[data-id="' + id + '"]');
if (!listItem) {
return;
}
listItem.className = listItem.className + ' editing';
var input = document.createElement('input');
input.className = 'edit';
listItem.appendChild(input);
input.focus();
input.value = title;
};
View.prototype._editItemDone = function (id, title) {
var listItem = qs('[data-id="' + id + '"]');
if (!listItem) {
return;
}
var input = qs('input.edit', listItem);
listItem.removeChild(input);
listItem.className = listItem.className.replace('editing', '');
qsa('label', listItem).forEach(function (label) {
label.textContent = title;
});
};
View.prototype.render = function (viewCmd, parameter) {
var self = this;
var viewCommands = {
showEntries: function () {
self.$todoList.innerHTML = self.template.show(parameter);
},
removeItem: function () {
self._removeItem(parameter);
},
updateElementCount: function () {
self.$todoItemCounter.innerHTML = self.template.itemCounter(parameter);
},
clearCompletedButton: function () {
self._clearCompletedButton(parameter.completed, parameter.visible);
},
contentBlockVisibility: function () {
self.$main.style.display = self.$footer.style.display = parameter.visible ? 'block' : 'none';
},
toggleAll: function () {
self.$toggleAll.checked = parameter.checked;
},
setFilter: function () {
self._setFilter(parameter);
},
clearNewTodo: function () {
self.$newTodo.value = '';
},
elementComplete: function () {
self._elementComplete(parameter.id, parameter.completed);
},
editItem: function () {
self._editItem(parameter.id, parameter.title);
},
editItemDone: function () {
self._editItemDone(parameter.id, parameter.title);
}
};
viewCommands[viewCmd]();
};
View.prototype._itemId = function (element) {
var li = $parent(element, 'li');
return parseInt(li.dataset.id, 10);
};
View.prototype._bindItemEditDone = function (handler) {
var self = this;
$delegate(self.$todoList, 'li .edit', 'blur', function () {
if (!this.dataset.iscanceled) {
handler({
id: self._itemId(this),
title: this.value
});
}
});
$delegate(self.$todoList, 'li .edit', 'keypress', function (event) {
if (event.keyCode === self.ENTER_KEY) {
// Remove the cursor from the input when you hit enter just like if it
// were a real form
this.blur();
}
});
};
View.prototype._bindItemEditCancel = function (handler) {
var self = this;
$delegate(self.$todoList, 'li .edit', 'keyup', function (event) {
if (event.keyCode === self.ESCAPE_KEY) {
this.dataset.iscanceled = true;
this.blur();
handler({id: self._itemId(this)});
}
});
};
View.prototype.bind = function (event, handler) {
var self = this;
if (event === 'newTodo') {
$on(self.$newTodo, 'change', function () {
handler(self.$newTodo.value);
});
} else if (event === 'removeCompleted') {
$on(self.$clearCompleted, 'click', function () {
handler();
});
} else if (event === 'toggleAll') {
$on(self.$toggleAll, 'click', function () {
handler({completed: this.checked});
});
} else if (event === 'itemEdit') {
$delegate(self.$todoList, 'li label', 'dblclick', function () {
handler({id: self._itemId(this)});
});
} else if (event === 'itemRemove') {
$delegate(self.$todoList, '.destroy', 'click', function () {
handler({id: self._itemId(this)});
});
} else if (event === 'itemToggle') {
$delegate(self.$todoList, '.toggle', 'click', function () {
handler({
id: self._itemId(this),
completed: this.checked
});
});
} else if (event === 'itemEditDone') {
self._bindItemEditDone(handler);
} else if (event === 'itemEditCancel') {
self._bindItemEditCancel(handler);
}
};
// Export to window
window.app = window.app || {};
window.app.View = View;
}(window));
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