import datetime
import traceback

from asyncio import sleep
from vkbottle import API, bold, VKAPIError

import database
from handlers.user import format_rating
from messages import *


async def reset_counters(reset_month: bool, api: API):
    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(top_users, api)
            # noinspection PyArgumentList
            await api.messages.send(random_id=0, peer_id=chat['id'],
                                    message=str(message), format_data=message.as_raw_data())

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


async def check_birthdays(api: API):
    chats = database.DB.get_chats()
    for chat in chats:
        if chat['active'] == 0:
            continue

        chat_id = chat['id']
        members = await api.messages.get_conversation_members(peer_id=chat_id, extended=False, fields=['bdate'])
        today = datetime.datetime.today()

        for item in members.items:
            user_id = item.member_id
            if user_id < 0:
                continue
            user = database.create_user_if_not_exists(chat_id, user_id)

            for profile in members.profiles:
                if profile.id == user_id:
                    if profile.bdate is None or user['happy_birthday'] == 0:
                        break

                    parts = profile.bdate.split('.')
                    if len(parts) < 2:
                        break
                    day = int(parts[0])
                    month = int(parts[1])

                    if day == today.day and month == today.month:
                        message = chat['birthday_message'] or MESSAGE_DEFAULT_BIRTHDAY
                        message = message.format(name=f'@id{user_id} ({profile.first_name} {profile.last_name})')
                        await api.messages.send(random_id=0, peer_id=chat_id, message=message)

                    break


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(api: API):
    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 reset_counters(target_datetime.day == 1, api)
            await check_birthdays(api)
        except Exception:
            print(traceback.format_exc())

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


async def cleanup_users(api: API):
    for chat in database.DB.get_chats():
        chat_id = chat['id']
        try:
            members = await api.messages.get_conversation_members(peer_id=chat_id, extended=False)
        except VKAPIError as e:
            continue

        for user in database.DB.get_users(chat_id):
            user_id = user['user_id']
            found = False
            for profile in members.profiles:
                if profile.id == user_id:
                    found = True
                    break

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


async def startup_task(api: API):
    me = (await api.groups.get_by_id()).groups[0]
    print(f"Бот '{me.name}' (id={me.id}) запущен.")

    await cleanup_users(api)