import asyncio
import discord
import perms
import settings
from discord.ext import commands
if not discord.opus.is_loaded():
    # the 'opus' library here is opus.dll on windows
    # or libopus.so on linux in the current directory
    # you should replace this with the location the
    # opus library is located in and with the proper filename.
    # note that on windows this DLL is automatically provided for you
    discord.opus.load_opus('opus')

def __init__(self, bot):
    self.bot = bot

class VoiceEntry:
    def __init__(self, message, player):
        self.requester = message.author
        self.channel = message.channel
        self.player = player

    def __str__(self):
        fmt = ' {0.title} uploaded by {0.uploader} and requested by {1.display_name}'
        duration = self.player.duration
        if duration:
            fmt = fmt + ' [length: {0[0]}m {0[1]}s]'.format(divmod(duration, 60))
        return fmt.format(self.player, self.requester)

class VoiceState:
    def __init__(self, bot):
        self.current = None
        self.voice = None
        self.bot = bot
        self.play_next_song = asyncio.Event()
        self.songs = asyncio.Queue()
        self.skip_votes = set() # a set of user_ids that voted
        self.audio_player = self.bot.loop.create_task(self.audio_player_task())

    def is_playing(self):
        if self.voice is None or self.current is None:
            return False

        player = self.current.player
        return not player.is_done()

    @property
    def player(self):
        return self.current.player

    def skip(self):
        self.skip_votes.clear()
        if self.is_playing():
            self.player.stop()

    def toggle_next(self):
        self.bot.loop.call_soon_threadsafe(self.play_next_song.set)

    async def audio_player_task(self):
        while True:
            self.play_next_song.clear()
            self.current = await self.songs.get()
            pl = discord.Embed(title="Now playing", description=str(self.current), color=0x662F00)
            await self.bot.send_message(self.current.channel, embed=pl)
            self.current.player.start()
            await self.play_next_song.wait()
class Music:
    """Voice related commands.
    Works in multiple servers at once.
    """
    def __init__(self, bot):
        self.bot = bot
        self.voice_states = {}

    def get_voice_state(self, server):
        state = self.voice_states.get(server.id)
        if state is None:
            state = VoiceState(self.bot)
            self.voice_states[server.id] = state

        return state

    async def create_voice_client(self, channel):
        voice = await self.bot.join_voice_channel(channel)
        state = self.get_voice_state(channel.server)
        state.voice = voice

    def __unload(self):
        for state in self.voice_states.values():
            try:
                state.audio_player.cancel()
                if state.voice:
                    self.bot.loop.create_task(state.voice.disconnect())
            except:
                pass

    @commands.command(pass_context=True, no_pm=True)
    async def join(self, ctx, *, channel : discord.Channel):
        """Joins a voice channel."""
        try:
            await self.create_voice_client(channel)
        except discord.ClientException:
            await self.bot.say('```Already in a voice channel...```')
        except discord.InvalidArgument:
            await self.bot.say('```This is not a voice channel...```')
        else:
            await self.bot.say('```Ready to play audio in **```' + channel.name)

    @commands.command(pass_context=True, no_pm=True)
    async def summon(self, ctx):
        """Summons the bot to join your voice channel."""
        summoned_channel = ctx.message.author.voice_channel
        if summoned_channel is None:
            await self.bot.say('```Are you sure your in a channel?```')
            return False

        state = self.get_voice_state(ctx.message.server)
        if state.voice is None:
            state.voice = await self.bot.join_voice_channel(summoned_channel)
        else:
            await state.voice.move_to(summoned_channel)

        return True

    @commands.command(pass_context=True, no_pm=True)
    async def play(self, ctx, *, song : str):
        """Plays a song.
        If there is a song currently in the queue, then it is
        queued until the next song is done playing.
        This command automatically searches as well from YouTube.
        The list of supported sites can be found here:
        https://rg3.github.io/youtube-dl/supportedsites.html
        """
        state = self.get_voice_state(ctx.message.server)
        opts = {
            'default_search': 'auto',
            'format': 'best',
            'quiet': True,
        }

        if state.voice is None:
            success = await ctx.invoke(self.summon)
            print("searching music")
            if not success:
                return

        try:
            await self.bot.say("```Searching song...```")
            player = await state.voice.create_ytdl_player(song, ytdl_options=opts, after=state.toggle_next)
        except Exception as e:
            fmt = 'An error occurred while processing this request: ```py\n{}: {}\n```'
            await self.bot.send_message(ctx.message.channel , fmt.format(type(e).__name__, e))
        else:
            player.volume = 0.6
            entry = VoiceEntry(ctx.message, player)
            embed = discord.Embed()
            m, s = divmod(player.duration, 60)
            embed.title = "Music"
            embed.add_field(name="Song name", value="{} {}".format("test", player.title), inline=True)
            embed.add_field(name="Duration", value=str("{}:{}".format(m, s)), inline=True)
            embed.add_field(name="Likes/dislike", value=str(player.likes)+"/"+str(player.dislikes), inline=True)
            embed.add_field(name="Views", value=str(player.views))
            embed.description = "Queued "
            embed.add_field(name="Please add your own music", value="Do !play <link to song> to queue up a song!")
            embed.color = discord.Color.dark_green()


            await self.bot.send_message(ctx.message.channel, "", embed=embed)
            await state.songs.put(entry)

    @commands.command(pass_context=True, no_pm=True)
    async def volume(self, ctx, value : int):
        """Sets the volume of the currently playing song."""

        state = self.get_voice_state(ctx.message.server)
        if state.is_playing():
            player = state.player
            player.volume = value / 100
            await self.bot.say('Set the volume to {:.0%}'.format(player.volume))
    @commands.command(pass_context=True, no_pm=True)
    async def resume(self, ctx):
        """Resumes the currently played song."""
        state = self.get_voice_state(ctx.message.server)
        if state.is_playing():
            player = state.player
            player.resume()

    @commands.command(pass_context=True, no_pm=True)
    async def stop(self, ctx):
        """Stops playing audio and leaves the voice channel.
        This also clears the queue.
        """
        server = ctx.message.server
        state = self.get_voice_state(server)
        if perms.check(ctx.message.author, settings.stop):
            if state.is_playing():
                player = state.player
                player.stop()
        else:
            await self.bot.say("```You do not have permission to execute this command!```")
        if perms.check(ctx.message.author, settings.stop):
            try:
                state.audio_player.cancel()
                del self.voice_states[server.id]
                await state.voice.disconnect()
                await self.bot.say("```Cleared the queue and disconnected from voice channel.``` ")
            except:
                pass

    @commands.command(pass_context=True, no_pm=True)
    async def skip(self, ctx):
        """Vote to skip a song. The song requester can automatically skip.
        3 skip votes are needed for the song to be skipped.
        """
        skips = 2

        state = self.get_voice_state(ctx.message.server)
        if not state.is_playing():
            await self.bot.say('```Not playing any music right now...```')
            return
        role_names = [role.name for role in ctx.message.author.roles]
        voter = ctx.message.author
        if voter == state.current.requester:
            await self.bot.say('```Requester requested skipping song...```')
            state.skip()
        elif  perms.check(ctx.message.author, skips):
            await self.bot.say("```Skipping song...```")
            state.skip()
        elif voter.id not in state.skip_votes:
            state.skip_votes.add(voter.id)
            total_votes = len(state.skip_votes)
            if total_votes >= 3:
                await self.bot.say('```Skip vote passed, skipping song...```')
                state.skip()
            else:
                await self.bot.say('Skip vote added, currently at [{}/3]'.format(total_votes))
        else:
            await self.bot.say('```You have already voted to skip this song.```')

    @commands.command(pass_context=True, no_pm=True)
    async def playing(self, ctx):
        """Shows info about the currently played song."""

        state = self.get_voice_state(ctx.message.server)
        if state.current is None:
            await self.bot.say('```Not playing anything.```')
        else:
            skip_count = len(state.skip_votes)
            await self.bot.say('Now playing {} [skips: {}/3]'.format(state.current, skip_count))
async def find_or_create_text_channel(name, server, bot) :
    channels = server.channels
    for channel in channels:
        if str(channel.type) == 'text' and channel.name == name :
            return channel
    return await bot.create_channel(name=name, server=server, type='text')


def setup(bot):
    bot.add_cog(Music(bot))
    print('Music Module is loaded!')