# -*- coding: UTF-8 -*-
# pylint: disable=C0111,R0903

"""Displays sensor temperature

Parameters:
    * sensors.path: path to temperature file (default /sys/class/thermal/thermal_zone0/temp).
    * sensors.json: if set to 'true', interpret sensors.path as JSON 'path' in the output
                    of 'sensors -j' (i.e. <key1>/<key2>/.../<value>), for example, path could
                    be: 'coretemp-isa-00000/Core 0/temp1_input' (defaults to 'false')
    * sensors.match: (fallback) Line to match against output of 'sensors -u' (default: temp1_input)
    * sensors.match_pattern: (fallback) Line to match against before temperature is read (no default)
    * sensors.match_number: (fallback) which of the matches you want (default -1: last match).
    * sensors.show_freq: whether to show CPU frequency. (default: true)
"""

import re
import json
import logging

log = logging.getLogger(__name__)

import core.module
import core.widget
import core.input

import util.cli
import util.format

class Module(core.module.Module):
    def __init__(self, config, theme):
        super().__init__(config, theme, core.widget.Widget(self.temperature))

        self._temperature = 'unknown'
        self._mhz = 'n/a'
        self._match_number = int(self.parameter('match_number', '-1'))
        self._match_pattern = self.parameter('match_pattern', None)
        self._pattern = re.compile(r'^\s*{}:\s*([\d.]+)$'.format(self.parameter('match', 'temp1_input')), re.MULTILINE)
        self._json = util.format.asbool(self.parameter('json', False))
        self._freq = util.format.asbool(self.parameter('show_freq', True))
        core.input.register(self, button=core.input.LEFT_MOUSE, cmd='xsensors')
        self.determine_method()

    def determine_method(self):
        if self.parameter('path') != None and self._json == False:
            self.use_sensors = False # use thermal zone
        else:
            # try to use output of sensors -u
            try:
                output = util.cli.execute('sensors -u')
                self.use_sensors = True
                log.debug('Sensors command available')
            except FileNotFoundError as e:
                log.info('Sensors command not available, using /sys/class/thermal/thermal_zone*/')
                self.use_sensors = False

    def _get_temp_from_sensors(self):
        if self._json == True:
            try:
                output = json.loads(util.cli.execute('sensors -j'))
                for key in self.parameter('path').split('/'):
                    output = output[key]
                return int(float(output))
            except Exception as e:
                logging.error('unable to read sensors: {}'.format(str(e)))
                return 'unknown'
        else:
            output = util.cli.execute('sensors -u')
            if self._match_pattern:
                temp_pattern = self.parameter('match', 'temp1_input')
                match = re.search(r'{}.+{}:\s*([\d.]+)$'.format(self._match_pattern, temp_pattern), output.replace('\n', ''))
                if match:
                    return int(float(match.group(1)))
                else:
                    return 'unknown'
            match = self._pattern.findall(output)
            if match:
                return int(float(match[self._match_number]))
        return 'unknown'

    def get_temp(self):
        if self.use_sensors:
            temperature = self._get_temp_from_sensors()
            log.debug('Retrieve temperature from sensors -u')
        else:
            try:
                temperature = open(self.parameter('path', '/sys/class/thermal/thermal_zone0/temp')).read()[:2]
                log.debug('retrieved temperature from /sys/class/')
                # TODO: Iterate through all thermal zones to determine the correct one and use its value
                # https://unix.stackexchange.com/questions/304845/discrepancy-between-number-of-cores-and-thermal-zones-in-sys-class-thermal

            except IOError:
                temperature = 'unknown'
                log.info('Can not determine temperature, please install lm-sensors')

        return temperature

    def get_mhz(self):
        mhz = None
        try:
            output = open('/sys/devices/system/cpu/cpufreq/policy0/scaling_cur_freq').read()
            mhz = int(float(output)/1000.0)
        except:
            output = open('/proc/cpuinfo').read()
            m = re.search(r'cpu MHz\s+:\s+(\d+)', output)
            if m:
                mhz = int(m.group(1))
            else:
                m = re.search(r'BogoMIPS\s+:\s+(\d+)', output)
                if m:
                    return '{} BogoMIPS'.format(int(m.group(1)))
        if not mhz:
            return 'n/a'

        if mhz < 1000:
            return '{} MHz'.format(mhz)
        else:
            return '{:0.01f} GHz'.format(float(mhz)/1000.0)

    def temperature(self, _):
        if self._freq:
            return u'{}°c @ {}'.format(self._temperature, self._mhz)
        else:
            return u'{}°c'.format(self._temperature)

    def update(self):
        self._temperature = self.get_temp()
        if self._freq:
            self._mhz = self.get_mhz()

# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4