# pylint: disable=C0111,R0903

"""Displays the current color temperature of redshift

Requires the following executable:
    * redshift

Parameters:
    * redshift.location : location provider, either of 'auto' (default), 'geoclue2',
        'ipinfo' (requires the requests package), or 'manual'
        'auto' uses whatever redshift is configured to do
    * redshift.lat : latitude if location is set to 'manual'
    * redshift.lon : longitude if location is set to 'manual'
"""

import threading
import logging
log = logging.getLogger(__name__)
try:
    import requests
except ImportError:
    log.warning('unable to import module "requests": Location via IP disabled')

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

import util.cli

def is_terminated():
    for thread in threading.enumerate():
        if thread.name == 'MainThread' and not thread.is_alive():
            return True
    return False


def get_redshift_value(widget, location, lat, lon):
    while True:
        if is_terminated():
            return
        widget.get('condition').acquire()
        while True:
            try:
                widget.get('condition').wait(1)
            except RuntimeError:
                continue
            break
        widget.get('condition').release()

        command = ['redshift', '-p']
        if location == 'manual':
            command.extend(['-l', '{}:{}'.format(lat, lon)])
        if location == 'geoclue2':
            command.extend(['-l', 'geoclue2'])

        try:
            res = util.cli.execute(' '.join(command))
        except Exception:
            res = ''
            widget.set('temp', 'n/a')
            widget.set('transition', None)
            widget.set('state', 'day')
        for line in res.split('\n'):
            line = line.lower()
            if 'temperature' in line:
                widget.set('temp', line.split(' ')[2])
            if 'period' in line:
                state = line.split(' ')[1]
                if 'day' in state:
                    widget.set('state', 'day')
                elif 'night' in state:
                    widget.set('state', 'night')
                else:
                    widget.set('state', 'transition')
                    widget.set('transition', ' '.join(line.split(' ')[2:]))

class Module(core.module.Module):
    @core.decorators.every(seconds=10)
    def __init__(self, config):
        widget = core.widget.Widget(self.text)
        super().__init__(config, widget)

        self._location = self.parameter('location', 'auto')
        self._lat = self.parameter('lat', None)
        self._lon = self.parameter('lon', None)

        # Even if location method is set to manual, if we have no lat or lon,
        # fall back to the geoclue2 method.
        #
        if self._location == 'manual' and (self._lat is None
                                           or self._lon is None):
            self._location == 'geoclue2'

        if self._location == 'ipinfo':
            try:
                location_url = 'http://ipinfo.io/json'
                location = requests.get(location_url).json()
                self._lat, self._lon = location['loc'].split(',')
                self._lat = str(float(self._lat))
                self._lon = str(float(self._lon))
                self._location = 'manual'
            except Exception:
                # Fall back to geoclue2.
                self._location = 'geoclue2'

        self._text = ''
        self._condition = threading.Condition()
        widget.set('condition', self._condition)
        self._thread = threading.Thread(target=get_redshift_value,
            args=(widget, self._location,
            self._lat, self._lon))
        self._thread.start()
        self._condition.acquire()
        self._condition.notify()
        self._condition.release()

    def text(self, widget):
        return '{}'.format(self._text)

    def update(self):
        widget = self.widget()
        self._condition.acquire()
        self._condition.notify()
        self._condition.release()
        temp = widget.get('temp', 'n/a')
        self._text = temp
        transition = widget.get('transition', None)
        if transition:
            self._text = '{} {}'.format(temp, transition)

    def state(self, widget):
        return widget.get('state', None)

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