# -*- coding: utf-8 -*-
# Description: chrony netdata python.d module
# Author: Dominik Schloesser (domschl)

from base import ExecutableService

# default module values (can be overridden per job in `config`)
# update_every = 10
priority = 60000
retries = 10

# charts order (can be overridden if you want less charts, or different order)
ORDER = ['system', 'offsets', 'stratum', 'root', 'frequency', 'residualfreq', 'skew']

CHARTS = {
    # id: {
    #     'options': [name, title, units, family, context, charttype],
    #     'lines': [
    #         [unique_dimension_name, name, algorithm, multiplier, divisor]
    #     ]}
    'system': {
        'options': [None, "Chrony System Time Deltas", "microseconds", 'system', 'chrony.system', 'area'],
        'lines': [
            ['timediff',   'system time', 'absolute', 1, 1000]
        ]},
    'offsets': {
        'options': [None, "Chrony System Time Offsets", "microseconds", 'system', 'chrony.offsets', 'area'],
        'lines': [
            ['lastoffset', 'last offset', 'absolute', 1, 1000],
            ['rmsoffset',  'RMS offset',  'absolute', 1, 1000]
        ]},
    'stratum': {
        'options': [None, "Chrony Stratum", "stratum", 'root', 'chrony.stratum', 'line'],
        'lines': [
            ['stratum', None, 'absolute', 1, 1]
        ]},
    'root': {
        'options': [None, "Chrony Root Delays", "milliseconds", 'root', 'chrony.root', 'line'],
        'lines': [
            ['rootdelay',      'delay',      'absolute', 1, 1000000],
            ['rootdispersion', 'dispersion', 'absolute', 1, 1000000]
        ]},
    'frequency': {
        'options': [None, "Chrony Frequency", "ppm", 'frequencies', 'chrony.frequency', 'area'],
        'lines': [
            ['frequency', None, 'absolute', 1, 1000]
        ]},
    'residualfreq': {
        'options': [None, "Chrony Residual frequency", "ppm", 'frequencies', 'chrony.residualfreq', 'area'],
        'lines': [
            ['residualfreq', 'residual frequency', 'absolute', 1, 1000]
        ]},
    'skew': {
        'options': [None, "Chrony Skew, error bound on frequency", "ppm", 'frequencies', 'chrony.skew', 'area'],
        'lines': [
            ['skew', None, 'absolute', 1, 1000]
        ]}
}

CHRONY = [('Frequency', 'frequency', 1e3),
          ('Last offset', 'lastoffset', 1e9),
          ('RMS offset', 'rmsoffset', 1e9),
          ('Residual freq', 'residualfreq', 1e3),
          ('Root delay', 'rootdelay', 1e9),
          ('Root dispersion', 'rootdispersion', 1e9),
          ('Skew', 'skew', 1e3),
          ('Stratum', 'stratum', 1),
          ('System time', 'timediff', 1e9)]


class Service(ExecutableService):
    def __init__(self, configuration=None, name=None):
        ExecutableService.__init__(
            self, configuration=configuration, name=name)
        self.command = "chronyc -n tracking"
        self.order = ORDER
        self.definitions = CHARTS

    def _get_data(self):
        """
        Format data received from shell command
        :return: dict
        """
        raw_data = self._get_raw_data()
        if not raw_data:
            return None

        raw_data = (line.split(':', 1) for line in raw_data)
        parsed, data = dict(), dict()

        for line in raw_data:
            try:
                key, value = (l.strip() for l in line)
            except ValueError:
                continue
            if value:
                parsed[key] = value.split()[0]

        for key, dim_id, multiplier in CHRONY:
            try:
                data[dim_id] = int(float(parsed[key]) * multiplier)
            except (KeyError, ValueError):
                continue

        return data or None