import datetime
import traceback

from asyncio import sleep
from aiogram import Bot
from aiogram.exceptions import TelegramBadRequest
from aiogram.types import ChatMemberBanned, ChatMemberLeft
from aiogram.utils.formatting import Bold

import tg.tg_database as database
from tg.handlers.user import format_rating


async def cleanup_users(bot: Bot):
    for chat in database.DB.get_chats():
        if chat['active'] == 0:
            continue

        chat_id = chat['id']

        for user in database.DB.get_top_silent(chat_id=chat_id, threshold_days=14):
            user_id = user['user_id']
            found = False
            try:
                info = await bot.get_chat_member(chat_id, user_id)
                if not isinstance(info, ChatMemberLeft) and not isinstance(info, ChatMemberBanned):
                    found = True
            except TelegramBadRequest:
                pass

            if not found:
                database.DB.delete_user(chat_id, user_id)
                print(f'Из чата (id={chat_id}) удален пользователь (id={user_id})')


async def reset_counters(reset_month: bool, bot: Bot):
    database.DB.reset_messages_today()
    print('Дневные счетчики сброшены.')

    if reset_month:
        for chat in database.DB.get_chats():
            if chat['active'] == 0:
                continue

            top_users = database.DB.get_top_messages_month(chat['id'])
            if len(top_users) == 0:
                continue

            message = Bold('Итоговая статистика за прошедший месяц') + '\n'
            message += await format_rating(chat['id'], top_users, bot)
            await bot.send_message(chat_id=chat['id'], **message.as_kwargs())

        database.DB.reset_messages_month()
        print('Месячные счетчики сброшены.')


async def wait_until(target_time: datetime.datetime):
    now = datetime.datetime.now(target_time.tzinfo)
    if now >= target_time:
        return

    delay_seconds = (target_time - now).total_seconds()
    await sleep(delay_seconds)


async def daily_maintenance_task(bot: Bot):
    tz = datetime.timezone(datetime.timedelta(hours=3), name="MSK")

    target_time = datetime.time(6, 0, 0, tzinfo=tz)
    now = datetime.datetime.now(tz)
    if now.hour > target_time.hour or now.hour == target_time.hour and now.minute > target_time.minute:
        target_date = now.date() + datetime.timedelta(days=1)
    else:
        target_date = now.date()
    target_datetime = datetime.datetime.combine(target_date, target_time)

    while True:
        await wait_until(target_datetime)

        try:
            await cleanup_users(bot)
            await reset_counters(target_datetime.day == 1, bot)
        except Exception:
            print(traceback.format_exc())

        target_datetime = target_datetime + datetime.timedelta(days=1)


async def startup_task(bot: Bot):
    me = await bot.get_me()
    print(f"Бот '{me.full_name}' (id={me.id}) запущен.")