"""Displays bluetooth status. Left mouse click launches manager app,
right click toggles bluetooth. Needs dbus-send to toggle bluetooth state and
python-dbus to count the number of connections

Parameters:
    * bluetooth.manager : application to launch on click (blueman-manager)
"""


import os
import re
import subprocess
import dbus
import dbus.mainloop.glib
import logging

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

import util.cli

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

        self.manager = self.parameter('manager', 'blueman-manager')
        self._status = 'Off'
        dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
        self._bus = dbus.SystemBus()

        core.input.register(self, button=core.input.LEFT_MOUSE,
                                       cmd=self.manager)
        core.input.register(self, button=core.input.RIGHT_MOUSE,
                                           cmd=self._toggle)

    def status(self, widget):
        """Get status."""
        return self._status

    def update(self):
        """Update current state."""
        state = len(subprocess.run(['bluetoothctl', 'list'], stdout=subprocess.PIPE).stdout)
        if state > 0:
            connected_devices = self.get_connected_devices()
            self._status = 'On - {}'.format(connected_devices)
        else:
            self._status = 'Off'
            adapters_cmd = 'rfkill list | grep Bluetooth'
            if not len(subprocess.run(adapters_cmd, shell=True, stdout=subprocess.PIPE).stdout):
                self._status = 'No Adapter Found'
        return

    def _toggle(self, widget=None):
        """Toggle bluetooth state."""
        if 'On' in self._status:
            state = 'false'
        else:
            state = 'true'

        cmd = 'dbus-send --system --print-reply --dest=org.blueman.Mechanism /org/blueman/mechanism org.blueman.Mechanism.SetRfkillState boolean:%s' % state 

        logging.debug('bt: toggling bluetooth')
        core.util.execute(cmd)

    def state(self, widget):
        """Get current state."""
        state = []

        if self._status == 'No Adapter Found':
            state.append('critical')
        elif self._status == 'On - 0':
            state.append('warning')
        elif 'On' in self._status and not(self._status == 'On - 0'):
            state.append('ON')
        else:
            state.append('critical')
        return state

    def get_connected_devices(self):
        devices = 0
        objects = dbus.Interface(
            self._bus.get_object('org.bluez', '/'),
            'org.freedesktop.DBus.ObjectManager'
        ).GetManagedObjects()
        for path, interfaces in objects.items():
            if 'org.bluez.Device1' in interfaces:
                if dbus.Interface(
                    self._bus.get_object('org.bluez', path),
                    'org.freedesktop.DBus.Properties'
                ).Get(
                    'org.bluez.Device1', 'Connected'
                ):
                    devices += 1
        return devices

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