import discord
from discord.ext import commands
from config import config
import datetime

from vulkan.music.Downloader import Downloader
from vulkan.music.Playlist import Playlist
from vulkan.music.Searcher import Searcher
from vulkan.music.Song import Song
from vulkan.music.Types import Provider
from vulkan.music.utils import *


class Player(commands.Cog):
    def __init__(self, bot, guild):
        self.__searcher: Searcher = Searcher()
        self.__down: Downloader = Downloader()
        self.__playlist: Playlist = Playlist()
        self.__bot: discord.Client = bot
        self.__guild: discord.Guild = guild

        self.__timer = Timer(self.__timeout_handler)
        self.__playing = False

        # Flag to control if the player should stop totally the playing
        self.__force_stop = False

        self.YDL_OPTIONS = {'format': 'bestaudio', 'noplaylist': 'True'}
        self.FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5',
                               'options': '-vn'}

    async def connect(self, ctx) -> bool:
        if not ctx.author.voice:
            return False

        if self.__guild.voice_client == None:
            await ctx.author.voice.channel.connect(reconnect=True, timeout=None)
            return True

    def __play_next(self, error, ctx) -> None:
        if self.__force_stop:  # If it's forced to stop player
            self.__force_stop = False
            return

        song = self.__playlist.next_song()

        if song != None:
            coro = self.__play_music(ctx, song)
            self.__bot.loop.create_task(coro)
        else:
            self.__playing = False

    async def __play_music(self, ctx, song: Song) -> None:
        try:
            source = self.__ensure_source(song)
            if source == None:
                self.__play_next(None, ctx)

            self.__playing = True

            player = discord.FFmpegPCMAudio(song.source, **self.FFMPEG_OPTIONS)
            self.__guild.voice_client.play(
                player, after=lambda e: self.__play_next(e, ctx))

            self.__timer.cancel()
            self.__timer = Timer(self.__timeout_handler)

            await ctx.invoke(self.__bot.get_command('np'))

            songs = self.__playlist.songs_to_preload
            await self.__down.preload(songs)
        except:
            self.__play_next(None, ctx)

    async def play(self, ctx, track=str, requester=str) -> str:
        try:
            songs_names, provider = self.__searcher.search(track)
            if provider == Provider.Unknown or songs_names == None:
                embed = discord.Embed(
                    title=config.ERROR_TITLE,
                    description=config.INVALID_INPUT,
                    colours=config.COLOURS['blue'])
                await ctx.send(embed=embed)
                return

            elif provider == Provider.YouTube:
                songs_names = self.__down.extract_youtube_link(songs_names[0])

            songs_quant = 0
            for name in songs_names:
                song = self.__playlist.add_song(name, requester)
                songs_quant += 1

            songs_preload = self.__playlist.songs_to_preload
            await self.__down.preload(songs_preload)

        except:
            embed = discord.Embed(
                title=config.ERROR_TITLE,
                description=config.DOWNLOADING_ERROR,
                colours=config.COLOURS['blue'])
            await ctx.send(embed=embed)
            return

        if songs_quant == 1:
            song = self.__down.download_one(song)
            pos = len(self.__playlist)

            if song == None:
                embed = discord.Embed(
                    title=config.ERROR_TITLE,
                    description=config.DOWNLOADING_ERROR,
                    colours=config.COLOURS['blue'])
                await ctx.send(embed=embed)
                return
            elif not self.__playing:
                embed = discord.Embed(
                    title=config.SONG_PLAYER,
                    description=config.SONG_ADDED.format(song.title),
                    colour=config.COLOURS['blue'])
                await ctx.send(embed=embed)
            else:
                embed = self.__format_embed(song.info, config.SONG_ADDED_TWO, pos)
                await ctx.send(embed=embed)
        else:
            embed = discord.Embed(
                title=config.SONG_PLAYER,
                description=config.SONGS_ADDED.format(songs_quant),
                colour=config.COLOURS['blue'])
            await ctx.send(embed=embed)

        if not self.__playing:
            first_song = self.__playlist.next_song()
            await self.__play_music(ctx, first_song)

    async def play_prev(self, ctx) -> None:
        """Stop the currently playing cycle, load the previous song and play"""
        if self.__playlist.looping_one or self.__playlist.looping_all:  # Do not allow play if loop
            embed = discord.Embed(
                title=config.SONG_PLAYER,
                description=config.LOOP_ON,
                colour=config.COLOURS['blue']
            )
            await ctx.send(embed=embed)
            return

        song = self.__playlist.prev_song()  # Prepare the prev song to play again
        if song == None:
            embed = discord.Embed(
                title=config.SONG_PLAYER,
                description=config.NOT_PREVIOUS,
                colour=config.COLOURS['blue']
            )
            await ctx.send(embed=embed)
        else:
            if self.__guild.voice_client.is_playing() or self.__guild.voice_client.is_paused():
                # Will forbidden next_song to execute after stopping current player
                self.__force_stop = True
                self.__guild.voice_client.stop()
                self.__playing = False

            await self.__play_music(ctx, song)

    async def queue(self) -> discord.Embed:
        if self.__playlist.looping_one:
            info = self.__playlist.current.info
            title = config.ONE_SONG_LOOPING
            return self.__format_embed(info, title)

        songs_preload = self.__playlist.songs_to_preload

        if len(songs_preload) == 0:
            title = config.SONG_PLAYER
            text = config.EMPTY_QUEUE

        else:
            if self.__playlist.looping_all:
                title = config.ALL_SONGS_LOOPING
            else:
                title = config.QUEUE_TITLE

            await self.__down.preload(songs_preload)

            total_time = format_time(sum([int(song.duration if song.duration else 0)
                                          for song in songs_preload]))
            total_songs = len(self.__playlist)

            text = f'📜 Queue length: {total_songs} | ⌛ Duration: `{total_time}` downloaded  \n\n'

            for pos, song in enumerate(songs_preload, start=1):
                song_name = song.title if song.title else config.SONG_DOWNLOADING
                text += f"**`{pos}` - ** {song_name} - `{format_time(song.duration)}`\n"

        embed = discord.Embed(
            title=title,
            description=text,
            colour=config.COLOURS['blue']
        )

        return embed

    async def skip(self, ctx) -> bool:
        if self.__playlist.looping_one:
            embed = discord.Embed(
                title=config.SONG_PLAYER,
                description=config.LOOP_ON,
                colour=config.COLOURS['blue']
            )
            await ctx.send(embed=embed)
            return False

        if self.__guild.voice_client != None:
            self.__guild.voice_client.stop()
            return True
        else:
            return False

    def history(self) -> discord.Embed:
        history = self.__playlist.songs_history

        if len(history) == 0:
            text = config.HISTORY_EMPTY

        else:
            text = f'\n📜 History Length: {len(history)} | Max: {config.MAX_SONGS_HISTORY}\n'
            for pos, song in enumerate(history, start=1):
                text += f"**`{pos}` - ** {song.title} - `{format_time(song.duration)}`\n"

        embed = discord.Embed(
            title=config.HISTORY_TITLE,
            description=text,
            colour=config.COLOURS['blue']
        )
        return embed

    async def stop(self) -> bool:
        if self.__guild.voice_client == None:
            return False

        if self.__guild.voice_client.is_connected():
            self.__playlist.clear()
            self.__playlist.loop_off()
            self.__guild.voice_client.stop()
            await self.__guild.voice_client.disconnect()
            return True

    async def pause(self) -> bool:
        if self.__guild.voice_client == None:
            return False

        if self.__guild.voice_client.is_playing():
            self.__guild.voice_client.pause()
            return True

    async def resume(self) -> bool:
        if self.__guild.voice_client == None:
            return False

        if self.__guild.voice_client.is_paused():
            self.__guild.voice_client.resume()
            return True

    async def loop(self, args: str) -> str:
        args = args.lower()
        if self.__playlist.current == None:
            return config.PLAYER_NOT_PLAYING

        if args == 'one':
            description = self.__playlist.loop_one()
        elif args == 'all':
            description = self.__playlist.loop_all()
        elif args == 'off':
            description = self.__playlist.loop_off()
        else:
            raise commands.UserInputError(config.MY_ERROR_BAD_COMMAND)

        return description

    async def clear(self) -> None:
        self.__playlist.clear()

    async def now_playing(self) -> discord.Embed:
        if not self.__playing:
            embed = discord.Embed(
                title=config.SONG_PLAYER,
                description=config.PLAYER_NOT_PLAYING,
                colour=config.COLOURS['blue']
            )
            return embed

        if self.__playlist.looping_one:
            title = config.ONE_SONG_LOOPING
        else:
            title = config.SONG_PLAYING

        current_song = self.__playlist.current
        embed = self.__format_embed(current_song.info, title)

        return embed

    async def shuffle(self) -> str:
        try:
            self.__playlist.shuffle()
            songs = self.__playlist.songs_to_preload

            await self.__down.preload(songs)
            return config.SONGS_SHUFFLED
        except:
            return config.ERROR_SHUFFLING

    async def move(self, pos1, pos2='1') -> str:
        if not self.__playing:
            return config.PLAYER_NOT_PLAYING

        try:
            pos1 = int(pos1)
            pos2 = int(pos2)

        except:
            return config.ERROR_NUMBER

        result = self.__playlist.move_songs(pos1, pos2)

        songs = self.__playlist.songs_to_preload
        await self.__down.preload(songs)
        return result

    async def remove(self, position) -> str:
        """Remove a song from the queue in the position"""
        if not self.__playing:
            return config.PLAYER_NOT_PLAYING

        try:
            position = int(position)

        except:
            return config.ERROR_NUMBER

        result = self.__playlist.remove_song(position)
        return result

    def __format_embed(self, info=dict, title='', position='Playing Now') -> discord.Embed:
        """Configure the embed to show the song information"""
        embedvc = discord.Embed(
            title=title,
            description=f"[{info['title']}]({info['original_url']})",
            color=config.COLOURS['blue']
        )

        embedvc.add_field(name=config.SONGINFO_UPLOADER,
                          value=info['uploader'],
                          inline=False)

        embedvc.add_field(name=config.SONGINFO_REQUESTER,
                          value=info['requester'],
                          inline=True)

        if 'thumbnail' in info.keys():
            embedvc.set_thumbnail(url=info['thumbnail'])

        if 'duration' in info.keys():
            duration = str(datetime.timedelta(seconds=info['duration']))
            embedvc.add_field(name=config.SONGINFO_DURATION,
                              value=f"{duration}",
                              inline=True)
        else:
            embedvc.add_field(name=config.SONGINFO_DURATION,
                              value=config.SONGINFO_UNKNOWN_DURATION,
                              inline=True)

        embedvc.add_field(name=config.SONGINFO_POSITION,
                          value=position,
                          inline=True)

        return embedvc

    async def __timeout_handler(self) -> None:
        if self.__guild.voice_client == None:
            return

        if self.__guild.voice_client.is_playing() or self.__guild.voice_client.is_paused():
            self.__timer = Timer(self.__timeout_handler)

        elif self.__guild.voice_client.is_connected():
            self.__playlist.clear()
            self.__playlist.loop_off()
            await self.__guild.voice_client.disconnect()

    def __ensure_source(self, song: Song) -> str:
        while True:
            if song.source != None:  # If song got downloaded
                return song.source

            if song.problematic:  # If song got any error
                return None