import random
import re
import discord
import discord.opus
import discord.voice_client
import functools
import sys
import db
import youtube_dl
import concurrent.futures
import stagismo
import platform
import typing
import os
import asyncio
import configparser
import subprocess
import async_timeout
import raven
import cast
import pickle

# Queue emojis
queue_emojis = [":one:",
                ":two:",
                ":three:",
                ":four:",
                ":five:",
                ":six:",
                ":seven:",
                ":eight:",
                ":nine:",
                ":keycap_ten:"]

# Init the event loop
loop = asyncio.get_event_loop()

# Init the config reader
config = configparser.ConfigParser()
config.read("config.ini")


class DurationError(Exception):
    pass


class InfoNotRetrievedError(Exception):
    pass


class FileNotDownloadedError(Exception):
    pass


class AlreadyDownloadedError(Exception):
    pass


class OldVideo:
    def __init__(self):
        self.enqueuer = None  # type: typing.Optional[discord.User]
        self.filename = None  # type: typing.Optional[str]
        self.ytdl_url = None  # type: typing.Optional[str]
        self.data = None      # type: typing.Optional[dict]

    @staticmethod
    async def init(user_id: str, *, filename=None, ytdl_url=None, data=None):
        if filename is None and ytdl_url is None:
            raise Exception("Filename or url must be specified")
        self = OldVideo()
        self.enqueuer = int(user_id)
        self.filename = filename
        self.ytdl_url = ytdl_url
        self.data = data if data is not None else {}
        return self

    async def download(self):
        # Retrieve info before downloading
        with youtube_dl.YoutubeDL() as ytdl:
            info = await loop.run_in_executor(executor, functools.partial(ytdl.extract_info, self.ytdl_url,
                                                                          download=False))
        if "entries" in info:
            info = info["entries"][0]
        file_id = info.get("title", str(hash(self.ytdl_url)))
        file_id = re.sub(r'[/\\?*"<>|]', "_", file_id)
        # Set the filename to the downloaded video
        self.filename = file_id
        if os.path.exists(f"opusfiles/{file_id}.opus"):
            return
        if info.get("duration", 1) > int(config["YouTube"]["max_duration"]):
            raise DurationError(f"File duration is over the limit "
                                f"set in the config ({config['YouTube']['max_duration']}).")
        ytdl_args = {"noplaylist": True,
                     "format": "best",
                     "postprocessors": [{
                         "key": 'FFmpegExtractAudio',
                         "preferredcodec": 'opus'
                     }],
                     "outtmpl": f"opusfiles/{file_id}.opus",
                     "quiet": True}
        if "youtu" in self.ytdl_url:
            ytdl_args["username"] = config["YouTube"]["username"]
            ytdl_args["password"] = config["YouTube"]["password"]
        # Download the video
        with youtube_dl.YoutubeDL(ytdl_args) as ytdl:
            await loop.run_in_executor(executor, functools.partial(ytdl.download, [self.ytdl_url]))

    async def add_to_db(self):
        session = await loop.run_in_executor(executor, db.Session)
        pm = db.PlayedMusic(enqueuer_id=self.enqueuer,
                            filename=self.filename)
        session.add(pm)
        await loop.run_in_executor(executor, session.commit)
        await loop.run_in_executor(executor, session.close)

    def __str__(self):
        if self.data.get("title") is not None:
            return f"{self.data.get('title')}"
        elif self.filename is not None:
            return f"`{self.filename}`"
        else:
            return f"<{self.ytdl_url}>"


class Video:
    def __init__(self, url: str=None, file: str=None, info: dict=None):
        self.url = url
        if file is None and info is None:
            self.file = str(hash(url)) + ".opus"
        elif info is not None:
            self.file = re.sub(r'[/\\?*"<>|!]', "_", info["title"]) + ".opus"
        else:
            self.file = file
        self.downloaded = False if file is None else True
        self.info = info

    def __str__(self):
        if self.info is None or "title" not in self.info:
            return f"`{self.file}`"
        return f"_{self.info['title']}_"

    async def download(self, progress_hooks: typing.List["function"]=None):
        # File already downloaded
        if self.downloaded:
            raise AlreadyDownloadedError()
        # No progress hooks
        if progress_hooks is None:
            progress_hooks = []
        # Check if under max duration
        if self.info is not None and self.info.get("duration", 0) > int(config["YouTube"]["max_duration"]):
            raise DurationError()
        # Download the file
        with youtube_dl.YoutubeDL({"noplaylist": True,
                                   "format": "best",
                                   "postprocessors": [{
                                       "key": 'FFmpegExtractAudio',
                                       "preferredcodec": 'opus'
                                   }],
                                   "outtmpl": f"./opusfiles/{self.file}",
                                   "progress_hooks": progress_hooks,
                                   "quiet": True}) as ytdl:
            await loop.run_in_executor(executor, functools.partial(ytdl.download, [self.url]))
            self.downloaded = True

    async def create_player(self) -> discord.voice_client.ProcessPlayer:
        # Check if the file has been downloaded
        if not self.downloaded:
            raise FileNotDownloadedError()
        global voice_client
        return voice_client.create_ffmpeg_player(f"./opusfiles/{self.file}")


# noinspection PyUnreachableCode
if __debug__:
    version = "Dev"
    commit_msg = "_in sviluppo_"
else:
    # Find the latest git tag
    old_wd = os.getcwd()
    try:
        os.chdir(os.path.dirname(__file__))
        version = str(subprocess.check_output(["git", "describe", "--tags"]), encoding="utf8").strip()
        commit_msg = str(subprocess.check_output(["git", "log", "-1", "--pretty=%B"]), encoding="utf8").strip()
    except Exception:
        version = "❓"
    finally:
        os.chdir(old_wd)

# Init the discord bot
client = discord.Client()
if platform.system() == "Linux":
    discord.opus.load_opus("/usr/lib/x86_64-linux-gnu/libopus.so")
elif platform.system() == "Windows":
    discord.opus.load_opus("libopus-0.dll")

voice_client = None
voice_player = None
voice_queue = []
old_voice_queue = []

# Init the executor
executor = concurrent.futures.ThreadPoolExecutor(max_workers=3)

# Init the Sentry client
sentry = raven.Client(config["Sentry"]["token"],
                      release=version,
                      install_logging_hook=False,
                      hook_libraries=[])


async def on_error(event, *args, **kwargs):
    ei = sys.exc_info()
    print("ERRORE CRITICO:\n" + repr(ei[1]) + "\n\n" + repr(ei))
    try:
        await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                  f"☢️ **ERRORE CRITICO NELL'EVENTO** `{event}`\n"
                                  f"Il bot si è chiuso e si dovrebbe riavviare entro qualche minuto.\n"
                                  f"Una segnalazione di errore è stata automaticamente mandata a Steffo.\n\n"
                                  f"Dettagli dell'errore:\n"
                                  f"```python\n"
                                  f"{repr(ei[1])}\n"
                                  f"```")
        if voice_client is not None:
            await voice_client.disconnect()
        await client.change_presence(status=discord.Status.invisible)
        await client.close()
    except Exception as e:
        print("ERRORE CRITICO PIU' CRITICO:\n" + repr(e) + "\n\n" + repr(sys.exc_info()))
    loop.stop()
    sentry.captureException(exc_info=ei)
    os._exit(1)
    pass


@client.event
async def on_ready():
    await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                              f"ℹ Royal Bot avviato e pronto a ricevere comandi!\n"
                              f"Ultimo aggiornamento: `{version}: {commit_msg}`")
    await client.change_presence(game=None, status=discord.Status.online)


@client.event
async def on_message(message: discord.Message):
    global voice_client
    global old_voice_queue
    global voice_player
    if not message.content.startswith("!"):
        return
    sentry.user_context({
        "discord": {
            "discord_id": message.author.id,
            "name": message.author.name,
            "discriminator": message.author.discriminator
        }
    })
    await client.send_typing(message.channel)
    session = await loop.run_in_executor(executor, db.Session)
    user = session.query(db.Discord).filter_by(discord_id=message.author.id).one_or_none()
    if user is None:
        user = db.Discord(discord_id=message.author.id,
                          name=message.author.name,
                          discriminator=message.author.discriminator,
                          avatar_hex=message.author.avatar)
        session.add(user)
        await loop.run_in_executor(executor, session.commit)
    else:
        sentry.user_context({
            "discord": {
                "discord_id": message.author.id,
                "name": message.author.name,
                "discriminator": message.author.discriminator
            },
            "royal": {
                "user_id": user.royal_id
            }
        })
    if message.content.startswith("!ping"):
        await cmd_ping(channel=message.channel,
                       author=message.author,
                       params=["/ping"])
    elif message.content.startswith("!link"):
        if user.royal_id is None:
            await client.send_message(message.channel,
                                      "⚠️ Il tuo account Discord è già collegato a un account RYG "
                                      "o l'account RYG che hai specificato è già collegato a un account Discord.")
            return
        try:
            username = message.content.split(" ", 1)[1]
        except IndexError:
            await client.send_message(message.channel, "⚠️ Non hai specificato un username!\n"
                                                       "Sintassi corretta: `!link <username_ryg>`")
            return
        royal = session.query(db.Royal).filter_by(username=username).one_or_none()
        if royal is None:
            await client.send_message(message.channel,
                                      "⚠️ Non esiste nessun account RYG con questo nome.")
            return
        user.royal_id = royal.id
        session.commit()
        session.close()
        await client.send_message(message.channel, "✅ Sincronizzazione completata!")
    elif message.content.startswith("!cv"):
        await cmd_cv(channel=message.channel,
                     author=message.author,
                     params=message.content.split(" "))
    elif message.content.startswith("!play"):
        await cmd_play(channel=message.channel,
                       author=message.author,
                       params=message.content.split(" "))
    elif message.content.startswith("!skip"):
        await cmd_skip(channel=message.channel,
                       author=message.author,
                       params=message.content.split(" "))
    elif message.content.startswith("!remove"):
        await cmd_remove(channel=message.channel,
                         author=message.author,
                         params=message.content.split(" "))
    elif message.content.startswith("!queue"):
        await cmd_queue(channel=message.channel,
                        author=message.author,
                        params=message.content.split(" "))
    elif message.content.startswith("!cast"):
        try:
            spell = message.content.split(" ", 1)[1]
        except IndexError:
            await client.send_message(message.channel, "⚠️ Non hai specificato nessun incantesimo!\n"
                                                       "Sintassi corretta: `!cast <nome_incantesimo>`")
            return
        target: discord.Member = random.sample(list(message.server.members), 1)[0]
        await client.send_message(message.channel, cast.cast(spell_name=spell, target_name=target.name,
                                                             platform="discord"))
    elif message.content.startswith("!smecds"):
        ds = random.sample(stagismo.listona, 1)[0]
        await client.send_message(message.channel, f"Secondo me, è colpa {ds}.", tts=True)
    elif __debug__ and message.content.startswith("!exception"):
        raise Exception("!exception was called")


async def update_users_pipe(users_connection):
    await client.wait_until_ready()
    while True:
        msg = await loop.run_in_executor(executor, users_connection.recv)
        if msg == "/cv":
            discord_members = list(client.get_server(config["Discord"]["server_id"]).members)
            users_connection.send(discord_members)
        if msg == "/uranium":
            await add_video_from_url("https://www.youtube.com/watch?v=iutuQbMAx04")


def command(func):
    """Decorator. Runs the function as a Discord command."""
    async def new_func(channel: discord.Channel, author: discord.Member, params: typing.List[str], *args, **kwargs):
        sentry.user_context({
            "discord_id": author.id,
            "username": f"{author.name}#{author.discriminator}"
        })
        try:
            result = await func(channel=channel, author=author, params=params, *args, **kwargs)
        except Exception:
            ei = sys.exc_info()
            try:
                await client.send_message(channel,
                                          f"☢ **ERRORE DURANTE L'ESECUZIONE DEL COMANDO {params[0]}**\n"
                                          f"Il comando è stato ignorato.\n"
                                          f"Una segnalazione di errore è stata automaticamente mandata a Steffo.\n\n"
                                          f"Dettagli dell'errore:\n"
                                          f"```python\n"
                                          f"{repr(ei[1])}\n"
                                          f"```")
            except Exception as e:
                pass
            sentry.captureException(exc_info=ei)
        else:
            return result
    return new_func


def requires_cv(func):
    "Decorator. Ensures the voice client is connected before running the command."
    async def new_func(channel: discord.Channel, author: discord.Member, params: typing.List[str], *args, **kwargs):
        global voice_client
        if voice_client is None or not voice_client.is_connected():
            await client.send_message(channel,
                                      "⚠️ Non sono connesso alla cv!\n"
                                      "Fammi entrare scrivendo `!cv` mentre sei in chat vocale.")
            return
        return await func(channel=channel, author=author, params=params, *args, **kwargs)
    return new_func


def requires_rygdb(func, optional=False):
    async def new_func(channel: discord.Channel, author: discord.Member, params: typing.List[str], *args, **kwargs):
        session = await loop.run_in_executor(executor, db.Session)
        dbuser = await loop.run_in_executor(executor,
                                            session.query(db.Discord)
                                            .filter_by(discord_id=author.id)
                                            .join(db.Royal)
                                            .first)
        if not optional and dbuser is None:
            await client.send_message(channel,
                                      "⚠️ Devi essere registrato su Royalnet per poter utilizzare questo comando.")
            return
        await loop.run_in_executor(executor, session.close)
        return await func(channel=channel, author=author, params=params, dbuser=dbuser, *args, **kwargs)
    return new_func


@command
async def cmd_ping(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    await client.send_message(channel, f"Pong!")


@command
async def cmd_cv(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    await client.send_typing(channel)
    if author.voice.voice_channel is None:
        await client.send_message(channel, "⚠ Non sei in nessun canale!")
        return
    global voice_client
    if voice_client is not None and voice_client.is_connected():
        await voice_client.move_to(author.voice.voice_channel)
    else:
        voice_client = await client.join_voice_channel(author.voice.voice_channel)
    await client.send_message(channel, f"✅ Mi sono connesso in <#{author.voice.voice_channel.id}>.")


async def add_video_from_url(url):
    # Retrieve info
    with youtube_dl.YoutubeDL({"quiet": True,
                               "ignoreerrors": True,
                               "simulate": True}) as ytdl:
        info = await loop.run_in_executor(executor,
                                          functools.partial(ytdl.extract_info, url=url, download=False))
    if "entries" in info:
        # This is a playlist
        for entry in info["entries"]:
            voice_queue.append(Video(url=entry["webpage_url"], info=entry))
        return
    # This is a single video
    voice_queue.append(Video(url=url, info=info))


async def add_video_from_file(file):
    voice_queue.append(Video(file=file))


@command
@requires_cv
async def cmd_play(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    if len(params) < 2:
        await client.send_message(channel, "⚠ Non hai specificato una canzone da riprodurre!\n"
                                           "Sintassi: `!play <url|ricercayoutube|nomefile>`")
        return
    # Parse the parameter as URL
    url = re.match(r"(?:https?://|ytsearch[0-9]*:).*", " ".join(params[1:]).strip("<>"))
    if url is not None:
        # This is a url
        await add_video_from_url(url.group(0))
        await client.send_message(channel, f"✅ Video aggiunto alla coda.")
        return
    # Parse the parameter as file
    file_path = os.path.join(os.path.join(os.path.curdir, "opusfiles"), " ".join(params[1:]))
    if os.path.exists(file_path):
        # This is a file
        await add_video_from_file(file=file_path)
        await client.send_message(channel, f"✅ Video aggiunto alla coda.")
        return
    file_path += ".opus"
    if os.path.exists(file_path):
        # This is a file
        await add_video_from_file(file=file_path)
        await client.send_message(channel, f"✅ Video aggiunto alla coda.")
        return
    # Search the parameter on youtube
    search = params[1]
    # This is a search
    await add_video_from_url(url=f"ytsearch:{search}")
    await client.send_message(channel, f"✅ Video aggiunto alla coda.")


@command
@requires_cv
async def cmd_skip(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    global voice_player
    if voice_player is None:
        await client.send_message(channel, "⚠ Non c'è nessun video in riproduzione.")
        return
    voice_player.stop()
    await client.send_message(channel, f"⏩ Video saltato.")


@command
@requires_cv
async def cmd_remove(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    if len(voice_queue) == 0:
        await client.send_message(channel, "⚠ Non c'è nessun video in coda.")
        return
    if len(params) < 2:
        index = len(voice_queue) - 1
    else:
        try:
            index = int(params[1]) - 1
        except ValueError:
            await client.send_message(channel, "⚠ Il numero inserito non è valido.\n"
                                      "Sintassi: `!remove [numerovideo]`")
            return
    if abs(index) >= len(voice_queue):
        await client.send_message(channel, "⚠ Il numero inserito non corrisponde a nessun video nella playlist.\n"
                                  "Sintassi: `!remove [numerovideo]`")
        return
    video = voice_queue.pop(index)
    await client.send_message(channel, f":regional_indicator_x: {str(video)} è stato rimosso dalla coda.")


@command
async def cmd_queue(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    if len(voice_queue) == 0:
        await client.send_message(channel, "**Video in coda:**\n"
                                           "nessuno")
        return
    msg = "**Video in coda:**\n"
    for index, video in enumerate(voice_queue[:10]):
        msg += f"{queue_emojis[index]} {str(video)}\n"
    if len(voice_queue) > 10:
        msg += f"più altri {len(voice_queue) - 10} video!"
    await client.send_message(channel, msg)


async def queue_predownload_videos():
    while True:
        for index, video in enumerate(voice_queue[:int(config["YouTube"]["predownload_videos"])].copy()):
            if video.downloaded:
                continue
            try:
                with async_timeout.timeout(int(config["YouTube"]["download_timeout"])):
                    await video.download()
            except asyncio.TimeoutError:
                await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                          f"⚠️ Il download di {str(video)} ha richiesto più di"
                                          f" {config['YouTube']['download_timeout']} secondi, pertanto è stato rimosso"
                                          f" dalla coda.")
                del voice_queue[index]
                continue
            except DurationError:
                await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                          f"⚠️ {str(video)} dura più di {config['YouTube']['download_timeout']}"
                                          f" secondi, quindi è stato rimosso dalla coda.")
                del voice_queue[index]
                continue
            except Exception as e:
                await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                          f"⚠️ E' stato incontrato un errore durante il download di {str(video)},"
                                          f" quindi è stato rimosso dalla coda.\n\n"
                                          f"```python\n"
                                          f"{str(e)}"
                                          f"```")
                del voice_queue[index]
                continue
        await asyncio.sleep(1)


async def queue_play_next_video():
    await client.wait_until_ready()
    global voice_client
    global voice_player
    while True:
        if voice_client is None:
            await asyncio.sleep(1)
            continue
        if voice_player is not None and not voice_player.is_done():
            await asyncio.sleep(0.5)
            continue
        if len(voice_queue) == 0:
            await asyncio.sleep(0.5)
            continue
        next_video = voice_queue[0]
        if not next_video.downloaded:
            await asyncio.sleep(0.5)
            continue
        voice_player = await next_video.create_player()
        voice_player.start()
        del voice_queue[0]


async def update_old_music_queue():
    await client.wait_until_ready()
    global voice_client
    global voice_player
    global old_voice_queue
    while True:
        try:
            if voice_client is None:
                await asyncio.sleep(5)
                continue
            if voice_player is not None and not voice_player.is_done():
                await asyncio.sleep(1)
                continue
            if len(old_voice_queue) == 0:
                await client.change_presence()
                await asyncio.sleep(1)
                continue
            video = old_voice_queue.pop(0)
            if video.ytdl_url:
                await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                          f"⬇️ E' iniziato il download di {str(video)}.")
                try:
                    async with async_timeout.timeout(30):
                        await video.download()
                except asyncio.TimeoutError:
                    await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                              f"⚠️ Il download della canzone ha richiesto più di 30 secondi ed è stato "
                                              f"annullato. ")
                    continue
                except DurationError:
                    await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                              f"⚠️ Il file supera il limite di durata impostato in config.ini "
                                              f"(`{config['YouTube']['max_duration']}` secondi).")
                    continue
                except Exception as e:
                    await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                              f"⚠️ C'è stato un errore durante il download di `{video.ytdl_url}`:\n"
                                              f"```\n"
                                              f"{e}\n"
                                              f"```")
                    continue
            voice_player = voice_client.create_ffmpeg_player(f"opusfiles/{video.filename}.opus")
            voice_player.start()
            await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                      f"▶ Ora in riproduzione in <#{voice_client.channel.id}>:\n"
                                      f"`{video.filename}`")
            await client.change_presence(game=discord.Game(name=video.filename, type=2))
            await video.add_to_db()
        except Exception:
            ei = sys.exc_info()
            try:
                await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                          f"☢️ **ERRORE CRITICO NELL'AGGIORNAMENTO DELLA CODA DI VIDEO**\n"
                                          f"Il bot si è disconnesso dalla chat vocale, e ha svuotato la coda.\n"
                                          f"Una segnalazione di errore è stata automaticamente mandata a Steffo.\n\n"
                                          f"Dettagli dell'errore:\n"
                                          f"```python\n"
                                          f"{repr(ei[1])}\n"
                                          f"```")
                if voice_player is not None:
                    await voice_player.stop()
                voice_player = None
                await voice_client.disconnect()
                voice_client = None
                old_voice_queue = []
            except Exception as e:
                print("ERRORE CRITICO PIU' CRITICO:\n" + repr(e) + "\n\n" + repr(sys.exc_info()))
            sentry.captureException(exc_info=ei)


def process(users_connection=None):
    print("Discordbot starting...")
    if users_connection is not None:
        asyncio.ensure_future(update_users_pipe(users_connection))
    asyncio.ensure_future(queue_predownload_videos())
    asyncio.ensure_future(queue_play_next_video())
    client.on_error = on_error
    client.run(config["Discord"]["bot_token"])


if __name__ == "__main__":
    process()