#!/usr/bin/env python3

import logging
import random
import traceback
from html import escape
from queue import Queue, Empty
from time import sleep
from threading import Thread
from typing import Dict, List

import sentry_sdk
from telegram.error import Unauthorized, TelegramError
from telegram.ext import Updater, CommandHandler, MessageHandler, Filters, CallbackQueryHandler
from telegram import Message, Update, Bot, InlineKeyboardMarkup, InlineKeyboardButton, User, InputMediaPhoto, \
    InputMediaVideo, InputMediaAnimation, InputMediaAudio, InputMediaDocument

from config import BOT_TOKEN, SENTRY_DSN, MANAGEMENT_CHAT, DEBUG
from db import get_conn, Subscriber, PersistentMapping, commit
from send_users_list import send_users_list


logging.basicConfig(level=logging.WARNING)
queue = Queue()
sentry_sdk.init(dsn=SENTRY_DSN)
conn = get_conn()

MAX_MESSAGE_LENGTH = 4096
MAX_CAPTION_LENGTH = 1024


def _notify_access_request(bot: Bot, user: User):
    markup = InlineKeyboardMarkup([[InlineKeyboardButton('Добавить', callback_data=f'add {user.id}')]])
    bot.send_message(MANAGEMENT_CHAT, f'<a href="tg://user?id={user.id}">{escape(user.full_name)}</a> запросил доступ',
                     parse_mode='html', reply_markup=markup)


def welcome(bot: Bot, update: Update):
    if DEBUG:
        _add_user(bot, update.effective_user.id)
        update.message.reply_text('Добро пожаловать (debug)')
        return

    if update.effective_user.id in conn.root.subscribers:
        update.message.reply_text('Вы уже являетесь участником ЛОНО')
    else:
        update.message.reply_text('Пожалуйста, обратитесь к @lono_contactbot')
        _notify_access_request(bot, update.message.from_user)


def unsubscribe(bot: Bot, update: Update):
    user = _remove_user(update.message.chat_id)
    update.message.reply_text('Вы были отписаны от бота. '
                              'Обратитесь к @lono_contactbot если вы хотите подписаться снова.')
    bot.send_message(MANAGEMENT_CHAT, f'<a href="tg://user?id={user.id}">{escape(user.name)}</a> отписался')


def _add_user(bot, uid):
    user = conn.root.subscribers[uid] = Subscriber.from_chat(bot.get_chat(uid))
    commit()
    return user


def add_user(bot: Bot, update: Update, groups=(), args=()):
    if update.callback_query:
        update.callback_query.answer()

    if groups:
        if update.callback_query.message.chat.id != MANAGEMENT_CHAT:
            return
        uid = groups[0]
    elif args:
        uid = args[0]
    elif update.message and update.message.reply_to_message and update.message.reply_to_message.forward_from:
        uid = update.message.reply_to_message.forward_from.id
    else:
        return bot.send_message(MANAGEMENT_CHAT, 'Укажите ID пользователя или ответьте на его сообщение')

    try:
        uid = int(uid)
    except (ValueError, TypeError):
        pass

    try:
        user = _add_user(bot, uid)
        if update.callback_query:
            update.callback_query.message.edit_reply_markup()
        bot.send_message(MANAGEMENT_CHAT, f'<a href="tg://user?id={uid}">{escape(user.name)}</a> был добавлен',
                         parse_mode='html')
        bot.send_message(uid, 'Добро пожаловать. Снова.')
    except TelegramError as e:
        bot.send_message(MANAGEMENT_CHAT, str(e))


def _remove_user(uid):
    user = conn.root.subscribers[uid]
    del conn.root.subscribers[uid]
    commit()
    return user


def remove_user(bot: Bot, update: Update, groups=(), args=()):
    if update.callback_query:
        update.callback_query.answer()

    if groups:
        if update.callback_query.message.chat.id != MANAGEMENT_CHAT:
            return
        uid = groups[0]
    elif args:
        uid = args[0]
    elif update.message and update.message.reply_to_message and update.message.reply_to_message.forward_from:
        uid = update.message.reply_to_message.forward_from.id
    else:
        return bot.send_message(MANAGEMENT_CHAT, 'Укажите ID пользователя или ответьте на его сообщение')

    try:
        uid = int(uid)
    except (ValueError, TypeError):
        pass

    try:
        user = _remove_user(uid)
        bot.send_message(MANAGEMENT_CHAT, f'<a href="tg://user?id={uid}">{escape(user.name)}</a> был удален',
                         parse_mode='html')
        if update.callback_query:
            update.callback_query.message.edit_reply_markup()
    except KeyError:
        bot.send_message(MANAGEMENT_CHAT, f'Пользователь id={uid} не был найден')


def users(bot: Bot, update: Update):
    send_users_list()


def msg(bot: Bot, update: Update):
    queue.put(update.message)


def _sign_text(text, m: Message, limit):
    if not text:
        text = ''

    sign = ''
    if text.startswith('!sign') or text.startswith('/sign'):
        text = text[5:]
        # sign = f'\n\n____________\n' \
        #        f'by <a href="tg://user?id={m.from_user.id}">{escape(m.from_user.full_name)}</a>'
        subs = conn.root.subscribers
        random_user = subs[random.choice(list(subs.keys()))]
        sign = f'\n\n____________\n' \
               f'by <a href="https://telegra.ph/C-pervym-aprelya-04-01">{escape(random_user.name)}</a>'

    return text[:limit - len(sign)] + sign


def _process_media_group(bot: Bot, messages: List[Message]):
    if not messages:
        return

    m = messages[0]

    current_chat = m.chat_id
    users = conn.root.subscribers  # type: Dict[int, Subscriber]
    if current_chat not in users:
        if DEBUG:
            _add_user(bot, current_chat)
            m.reply_text('Добро пожаловать (debug)')
        else:
            _notify_access_request(bot, m.from_user)
            return m.reply_text('Пожалуйста, обратитесь к @lono_contactbot')

    reply_to_message_internal_id = None
    if m.reply_to_message and m.reply_to_message.message_id in users[current_chat].messages_forward:
        reply_to_message_internal_id = users[current_chat].messages_forward[m.reply_to_message.message_id]

    media_group = []
    for message in messages:
        caption = _sign_text(message.caption_html, message, MAX_CAPTION_LENGTH)

        if hasattr(message, 'photo') and message.photo:
            media_group.append(InputMediaPhoto(message.photo[-1].file_id, caption=caption, parse_mode='html'))
        elif hasattr(message, 'video') and message.video:
            media_group.append(InputMediaVideo(message.video.file_id, caption=caption, parse_mode='html'))
        elif hasattr(message, 'animation') and message.animation:
            media_group.append(InputMediaAnimation(message.animation.file_id, caption=caption, parse_mode='html'))
        elif hasattr(message, 'document') and message.document:
            media_group.append(InputMediaDocument(message.document.file_id, caption=caption, parse_mode='html'))
        elif hasattr(message, 'audio') and message.audio:
            media_group.append(InputMediaAudio(message.audio.file_id, caption=caption, parse_mode='html'))

    remove_uids = []

    for uid, user in users.items():
        sleep(.02)

        reply_to_message_id = None
        if reply_to_message_internal_id:
            reply_to_message_id = user.messages_reverse.get(reply_to_message_internal_id, None)

        try:
            sent_messages = bot.send_media_group(uid, media_group, reply_to_message_id=reply_to_message_id)
            if sent_messages:
                user.update_from_message(sent_messages[0])
                for r in sent_messages:
                    user.messages_forward[r.message_id] = conn.root.counter
                    user.messages_reverse[conn.root.counter] = r.message_id
        except Unauthorized:
            remove_uids.append(uid)
            bot.send_message(MANAGEMENT_CHAT, f'<a href="tg://user?id={uid}">{user.name}</a> был удален '
                                              f'из-за блокировки бота', parse_mode='html')
        except Exception:
            traceback.print_exc()
            sentry_sdk.capture_exception()
    conn.root.counter += len(messages)
    commit()
    for uid in remove_uids:
        _remove_user(uid)


def _process_message(bot: Bot, m: Message):
    current_chat = m.chat_id
    users = conn.root.subscribers  # type: Dict[int, Subscriber]
    if current_chat not in users:
        if DEBUG:
            _add_user(bot, current_chat)
            m.reply_text('Добро пожаловать (debug)')
        else:
            _notify_access_request(bot, m.from_user)
            return m.reply_text('Пожалуйста, обратитесь к @lono_contactbot')

    text = _sign_text(m.text_html, m, MAX_MESSAGE_LENGTH)
    caption = _sign_text(m.caption_html, m, MAX_CAPTION_LENGTH)

    reply_to_message_internal_id = None
    if m.reply_to_message and m.reply_to_message.message_id in users[current_chat].messages_forward:
        reply_to_message_internal_id = users[current_chat].messages_forward[m.reply_to_message.message_id]

    remove_uids = []

    for uid, user in users.items():
        sleep(.02)

        reply_to_message_id = None
        if reply_to_message_internal_id:
            reply_to_message_id = user.messages_reverse.get(reply_to_message_internal_id, None)

        try:
            r = None
            if m.forward_date:
                r = m.forward(uid)
            elif hasattr(m, 'audio') and m.audio:
                a = m.audio
                r = bot.send_audio(uid, a.file_id, a.duration, a.performer, a.title, caption,
                                   reply_to_message_id=reply_to_message_id, parse_mode='html')
            elif hasattr(m, 'document') and m.document:
                d = m.document
                r = bot.send_document(uid, d.file_id, d.file_name, caption, reply_to_message_id=reply_to_message_id,
                                      parse_mode='html')
            elif hasattr(m, 'photo') and m.photo:
                p = m.photo
                r = bot.send_photo(uid, p[-1].file_id, caption, reply_to_message_id=reply_to_message_id,
                                   parse_mode='html')
            elif hasattr(m, 'sticker') and m.sticker:
                s = m.sticker
                r = bot.send_sticker(uid, s.file_id, reply_to_message_id=reply_to_message_id)
            elif hasattr(m, 'video') and m.video:
                v = m.video
                r = bot.send_video(uid, v.file_id, v.duration, caption, reply_to_message_id=reply_to_message_id,
                                   parse_mode='html')
            elif hasattr(m, 'voice') and m.voice:
                v = m.voice
                r = bot.send_voice(uid, v.file_id, v.duration, caption, reply_to_message_id=reply_to_message_id,
                                   parse_mode='html')
            elif hasattr(m, 'video_note') and m.video_note:
                vn = m.video_note
                r = bot.send_video_note(uid, vn.file_id, vn.duration, vn.length,
                                        reply_to_message_id=reply_to_message_id)
            elif hasattr(m, 'contact') and m.contact:
                c = m.contact
                r = bot.send_contact(uid, c.phone_number, c.first_name, c.last_name,
                                     reply_to_message_id=reply_to_message_id)
            elif hasattr(m, 'location') and m.location:
                l = m.location
                r = bot.send_location(uid, l.latitude, l.longitude, reply_to_message_id=reply_to_message_id)
            elif hasattr(m, 'venue') and m.venue:
                v = m.venue
                l = v.location
                r = bot.send_venue(uid, l.latitude, l.longitude, v.title, v.address, v.foursquare_id,
                                   reply_to_message_id=reply_to_message_id)
            elif hasattr(m, 'text') and m.text:
                r = bot.send_message(uid, text, 'html', reply_to_message_id=reply_to_message_id,
                                     disable_web_page_preview=True)
            if r:
                user.update_from_message(r)
                user.messages_forward[r.message_id] = conn.root.counter
                user.messages_reverse[conn.root.counter] = r.message_id
        except Unauthorized:
            remove_uids.append(uid)
            bot.send_message(MANAGEMENT_CHAT, f'<a href="tg://user?id={uid}">{user.name}</a> был удален '
                                              f'из-за блокировки бота', parse_mode='html')
        except Exception:
            traceback.print_exc()
            sentry_sdk.capture_exception()
    conn.root.counter += 1
    commit()
    for uid in remove_uids:
        _remove_user(uid)


def task_queue(u: Updater):
    while True:
        if not u.running:
            return

        try:
            m = queue.get(timeout=1)  # type: Message
            if m.media_group_id:
                media_group_id = m.media_group_id
                group_messages = [m]
                while queue.qsize() and queue.queue[0].media_group_id == media_group_id:
                    group_messages.append(queue.get(block=False))
                _process_media_group(u.bot, group_messages)
            else:
                _process_message(u.bot, m)
        except Empty:
            pass
        except:
            traceback.print_exc()
            sentry_sdk.capture_exception()


if __name__ == '__main__':
    updater = Updater(BOT_TOKEN, workers=4)

    updater.dispatcher.add_handler(CommandHandler('start', welcome, Filters.private))
    updater.dispatcher.add_handler(CommandHandler('stop', unsubscribe, Filters.private))
    updater.dispatcher.add_handler(CommandHandler('add', add_user, Filters.chat(MANAGEMENT_CHAT), pass_args=True))
    updater.dispatcher.add_handler(CallbackQueryHandler(add_user, pattern=r'^add (\d+)$', pass_groups=True))
    updater.dispatcher.add_handler(CommandHandler('remove', remove_user, Filters.chat(MANAGEMENT_CHAT), pass_args=True))
    updater.dispatcher.add_handler(CallbackQueryHandler(remove_user, pattern=r'^remove (\d+)$', pass_groups=True))
    updater.dispatcher.add_handler(CommandHandler('users', users, Filters.chat(MANAGEMENT_CHAT)))
    updater.dispatcher.add_handler(MessageHandler(Filters.private, msg))

    updater.start_polling()

    tq = Thread(target=task_queue, args=(updater,))
    tq.start()

    logging.warning('LONO has started')
    updater.idle()
    logging.warning('LONO is stopping...')
    commit()
    conn.close()