import asyncio
import youtube_dl
import discord
from discord.ext import commands


youtube_dl.utils.bug_reports_message = lambda: ""
ytdl = youtube_dl.YoutubeDL({
    "format": "bestaudio/best",
    "outtmpl": "%(extractor)s-%(id)s-%(title)s.%(ext)s",
    "restrictfilenames": True,
    "noplaylist": True,
    "nocheckcertificate": True,
    "ignoreerrors": False,
    "logtostderr": False,
    "quiet": True,
    "no_warnings": True,
    "default_search": "auto",
})


class YTDLSource(discord.PCMVolumeTransformer):
    def __init__(self, source, *, data, volume=0.5):
        super().__init__(source, volume)

        self.data = data

        self.title = data.get("title")
        self.url = data.get("url")

    @classmethod
    async def from_url(cls, url, *, loop=None, stream=False):
        loop = loop or asyncio.get_event_loop()
        data = await loop.run_in_executor(
            None, lambda: ytdl.extract_info(url, download=not stream)
        )

        if "entries" in data:
            # take first item from a playlist
            data = data["entries"][0]

        filename = data["url"] if stream else ytdl.prepare_filename(data)
        return cls(discord.FFmpegPCMAudio(filename, options='-vn'), data=data)


class Music(commands.Cog):
    def __init__(self, bot):
        self.bot = bot

    @commands.command()
    async def join(self, ctx, *, channel: discord.VoiceChannel):
        """Joins a voice channel"""

        if ctx.voice_client is not None:
            return await ctx.voice_client.move_to(channel)

        await channel.connect()

    @commands.command()
    async def play(self, ctx, *, url):
        """Streams from a url (same as yt, but doesn't predownload)"""

        async with ctx.typing():
            try:
                player = await YTDLSource.from_url(url, loop=self.bot.loop, stream=True)
                ctx.voice_client.play(
                    player, after=lambda e: print(f"Player error: {e}") if e else None
                )
            except Exception:
                await ctx.send("Sorry, I can't play that video.")
                return

        await ctx.send(f"Now playing: {player.title}")

    @commands.command()
    async def stop(self, ctx):
        """Stops and disconnects the bot from voice"""

        await ctx.voice_client.disconnect()

    @play.before_invoke
    async def ensure_voice(self, ctx):
        if ctx.voice_client is None:
            if ctx.author.voice:
                await ctx.author.voice.channel.connect()
            else:
                await ctx.send("You are not connected to a voice channel.")
                raise commands.CommandError("Author not connected to a voice channel.")
        elif ctx.voice_client.is_playing():
            ctx.voice_client.stop()