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 platform
import typing
import os
import asyncio
import configparser
import subprocess
import async_timeout
import raven
import logging
import errors

logging.basicConfig()

# 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 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']}_"

    def plain_text(self):
        if self.info is None or "title" not in self.info:
            return self.file
        return 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
now_playing = None
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 voice_player
    if message.channel != client.get_channel(config["Discord"]["main_channel"]) or message.author.bot:
        return
    sentry.user_context({
        "discord": {
            "discord_id": message.author.id,
            "name": message.author.name,
            "discriminator": message.author.discriminator
        }
    })
    if not message.content.startswith("!"):
        client.send_message(message.channel,
                            ":warning: In questa chat sono consentiti solo comandi per il bot.\n"
                            "Riinvia il tuo messaggio in <#425780562805129226>!")
        client.delete_message(message)
        return
    data = message.content.split(" ")
    if data[0] not in commands:
        await client.send_message(message.channel, ":warning: Comando non riconosciuto.")
        return
    await commands[data[0]](channel=client.get_channel(config["Discord"]["main_channel"]),
                            author=message.author,
                            params=data)


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 == "get cv":
            discord_members = list(client.get_server(config["Discord"]["server_id"]).members)
            users_connection.send(discord_members)
        elif msg.startswith("!"):
            data = msg.split(" ")
            if data[0] not in commands:
                users_connection.send("error")
                continue
            await commands[data[0]](channel=client.get_channel(config["Discord"]["main_channel"]),
                                    author=None,
                                    params=data)
            users_connection.send("success")


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):
        if author is not None:
            sentry.user_context({
                "discord_id": author.id,
                "username": f"{author.name}#{author.discriminator}"
            })
        else:
            sentry.user_context({
                "source": "Telegram"
            })
        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:
                pass
            sentry.captureException(exc_info=ei)
        else:
            return result
    return new_func


def requires_voice_client(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]):
    if author is None:
        await client.send_message(channel, "⚠ Questo comando richiede un autore.")
    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_voice_client
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 = " ".join(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_voice_client
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_voice_client
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) == 1:
        index = len(voice_queue) - 1
    elif len(params) == 2:
        try:
            index = int(params[1]) - 1
        except ValueError:
            await client.send_message(channel, "⚠ Il numero inserito non è valido.\n"
                                      "Sintassi: `!remove [numerovideoiniziale] [numerovideofinale]`")
            return
    if len(params) < 3:
        if abs(index) >= len(voice_queue):
            await client.send_message(channel, "⚠ Il numero inserito non corrisponde a nessun video nella playlist.\n"
                                      "Sintassi: `!remove [numerovideoiniziale] [numerovideofinale]`")
            return
        del voice_queue[index]
        await client.send_message(channel, f":regional_indicator_x: {str(video)} è stato rimosso dalla coda.")
        return
    try:
        start = int(params[1]) - 1
    except ValueError:
        await client.send_message(channel, "⚠ Il numero iniziale inserito non è valido.\n"
                                  "Sintassi: `!remove [numerovideoiniziale] [numerovideofinale]`")
        return
    if start >= len(voice_queue):
        await client.send_message(channel, "⚠ Il numero iniziale inserito non corrisponde a nessun video nella"
                                           " playlist.\n"
                                  "Sintassi: `!remove [numerovideoiniziale] [numerovideofinale]`")
        return
    try:
        end = int(params[2]) - 2
    except ValueError:
        await client.send_message(channel, "⚠ Il numero finale inserito non è valido.\n"
                                  "Sintassi: `!remove [numerovideoiniziale] [numerovideofinale]`")
        return
    if end >= len(voice_queue):
        await client.send_message(channel, "⚠ Il numero finale inserito non corrisponde a nessun video nella"
                                           " playlist.\n"
                                  "Sintassi: `!remove [numerovideoiniziale] [numerovideofinale]`")
        return
    if start > end:
        await client.send_message(channel, "⚠ Il numero iniziale è maggiore del numero finale.\n"
                                  "Sintassi: `!remove [numerovideoiniziale] [numerovideofinale]`")
        return
    del voice_queue[start:end]
    await client.send_message(channel, f":regional_indicator_x: {end - start} video rimossi 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)


@command
@requires_voice_client
async def cmd_shuffle(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    if len(voice_queue) == 0:
        await client.send_message(channel, "⚠ Non ci sono video in coda!")
        return
    random.shuffle(voice_queue)
    await client.send_message(channel, "♠️ ♦️ ♣️ ♥️ Shuffle completo!")


@command
@requires_voice_client
async def cmd_clear(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    global voice_queue
    if len(voice_queue) == 0:
        await client.send_message(channel, "⚠ Non ci sono video in coda!")
        return
    voice_queue = []
    await client.send_message(channel, ":regional_indicator_x: Tutti i video in coda rimossi.")


@command
@requires_voice_client
async def cmd_dump_voice_player_error(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    global voice_player
    if voice_player is None:
        return
    await client.send_message(channel, f"```\n{str(voice_player.error)}\n```")


@command
async def cmd_register(channel: discord.Channel, author: discord.Member, params: typing.List[str]):
    session = await loop.run_in_executor(executor, db.Session())
    if len(params) < 1:
        await client.send_message(channel, "⚠️ Non hai specificato un username!\n"
                                                   "Sintassi corretta: `!register <username_ryg>`")
        return
    try:
        d = db.Discord.create(session,
                              royal_username=params[0],
                              discord_user=author)
    except errors.AlreadyExistingError:
        await client.send_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
    session.add(d)
    session.commit()
    session.close()
    await client.send_message(channel, "✅ Sincronizzazione completata!")

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"
                                          f" {str(int(config['YouTube']['max_duration']) // 60)}"
                                          f" minuti, 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
    global now_playing
    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)
            if now_playing is not None:
                await client.change_presence()
                now_playing = None
            continue
        now_playing = voice_queue[0]
        if not now_playing.downloaded:
            await asyncio.sleep(0.5)
            continue
        voice_player = await now_playing.create_player()
        voice_player.start()
        await client.change_presence(game=discord.Game(name=now_playing.plain_text(), type=2))
        await client.send_message(client.get_channel(config["Discord"]["main_channel"]),
                                  f":arrow_forward: Ora in riproduzione: {str(now_playing)}")
        del voice_queue[0]


commands = {
    "!ping": cmd_ping,
    "!cv": cmd_cv,
    "!play": cmd_play,
    "!p": cmd_play,
    "!search": cmd_play,
    "!file": cmd_play,
    "!skip": cmd_skip,
    "!s": cmd_skip,
    "!remove": cmd_remove,
    "!cancel": cmd_remove,
    "!queue": cmd_queue,
    "!q": cmd_queue,
    "!shuffle": cmd_shuffle,
    "!clear": cmd_clear,
    "!dump_vp": cmd_dump_voice_player_error,
    "!register": cmd_register
}


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
    loop.run_until_complete(client.login(config["Discord"]["bot_token"], bot=True))
    loop.run_until_complete(client.connect())
    loop.run_until_complete(client.logout())


if __name__ == "__main__":
    process()