#!/usr/bin/env python

# MIT License
#
# Copyright (c) 2018 Andreas Backx
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


import os
import socket
import sys
import time
import traceback
from concurrent.futures import ThreadPoolExecutor

import click
import dbus
import dbus.mainloop.glib
import spotipy
import spotipy.util as util
from dbus.mainloop.glib import DBusGMainLoop
from gi.repository import GLib
from spotipy import SpotifyException
from spotipy.oauth2 import SpotifyClientCredentials

inactive_color = '%{F#6E6E6E}'
active_color = '%{F#CECECE}'
default_color = '%{F-}'

server_address = '/tmp/spotifycl-socket'


class Spotify:

    SPOTIFY_BUS = 'org.mpris.MediaPlayer2.spotify'
    SPOTIFYD_BUS = 'org.mpris.MediaPlayer2.spotifyd'
    SPOTIFY_OBJECT_PATH = '/org/mpris/MediaPlayer2'

    PLAYER_INTERFACE = 'org.mpris.MediaPlayer2.Player'
    PROPERTIES_INTERFACE = 'org.freedesktop.DBus.Properties'

    SAVE_REMOVE = b'save'

    def __init__(self):
        DBusGMainLoop(set_as_default=True)
        self.session_bus = dbus.SessionBus()
        self.last_output = ''
        self.empty_output = True

        # Last shown metadata
        self.last_title = None
        # Whether the current song is added to the library
        self.saved_track = False
        # Whether to ignore the update
        self.ignore = False

    def monitor(self):
        self.setup_properties_changed()
        self.freedesktop = self.session_bus.get_object(
            "org.freedesktop.DBus",
            "/org/freedesktop/DBus"
        )
        self.freedesktop.connect_to_signal(
            "NameOwnerChanged",
            self.on_name_owner_changed,
            arg0=self.SPOTIFYD_BUS
        )

        executor = ThreadPoolExecutor(max_workers=2)
        executor.submit(self._start_glib_loop)
        executor.submit(self._start_server)

    def _start_glib_loop(self):
        loop = GLib.MainLoop()
        loop.run()

    def _start_server(self):
        try:
            os.unlink(server_address)
        except OSError:
            if os.path.exists(server_address):
                raise
        sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        sock.bind(server_address)
        sock.listen(5)

    @property
    def metadata_status(self):
        spotify_properties = dbus.Interface(
            self.spotify,
            dbus_interface=Spotify.PROPERTIES_INTERFACE
        )
        metadata = spotify_properties.Get(
            Spotify.PLAYER_INTERFACE,
            'Metadata'
        )
        playback_status = spotify_properties.Get(
            Spotify.PLAYER_INTERFACE,
            'PlaybackStatus'
        )
        return metadata, playback_status

    def output(self, line):
        if not line:
            self.empty_output = True
        if line != self.last_output:
            print(line, flush=True)
            self.last_output = line

    def setup_spotify(self):
        try:
            self.spotify = self.session_bus.get_object(
                Spotify.SPOTIFY_BUS,
                Spotify.SPOTIFY_OBJECT_PATH
            )
        except dbus.DBusException:
            self.spotify = self.session_bus.get_object(Spotify.SPOTIFYD_BUS, Spotify.SPOTIFY_OBJECT_PATH)

    def setup_properties_changed(self):
        try:
            self.setup_spotify()
            self.spotify.connect_to_signal(
                'PropertiesChanged',
                self.on_properties_changed
            )

            if self.empty_output:
                metadata, playback_status = self.metadata_status
                self.output_playback_status(
                    data={
                        'Metadata': metadata,
                        'PlaybackStatus': playback_status,
                    }
                )

        except dbus.DBusException:
            self.output('')

    def output_playback_status(self, data, retry=False):
        if self.ignore:
            return

        metadata = data['Metadata']
        artists = metadata['xesam:artist']
        artist = artists[0] if artists else None

        if not artist:
            self.output('')
            return

        title = metadata['xesam:title']
        playback_status = data['PlaybackStatus']
        same_song = title == self.last_title

        color = active_color if playback_status == 'Playing' else inactive_color
        # divider = '+' if same_song and self.saved_track else '-'
        self.output(f'{color}{artist} - {title}{default_color}')

        if not same_song:
            self.last_title = title

    def on_properties_changed(self, interface, data, *args, **kwargs):
        self.output_playback_status(data)

    def on_name_owner_changed(self, name, old_owner, new_owner):
        if name == self.SPOTIFY_BUS:
            if new_owner:
                # Spotify was opened.
                self.setup_properties_changed()
            else:
                # Spotify was closed.
                self.spotify = None
                self.output('')


@click.group()
def cli():
    """Script for listening to Spotify over dbus and adding tracks to your library."""
    pass


@cli.command()
def status():
    """Follow the status of the currently playing song on Spotify."""
    spotify = Spotify()
    spotify.monitor()


if __name__ == '__main__':
    cli()
