from __future__ import annotations
from dataclasses import dataclass, field, asdict
import typing
import random
from datetime import date, timedelta
from telebot.types import ChatMember, Chat
import time
from threading import Thread

if typing.TYPE_CHECKING:
    from bot import Bot


def convert_to_date(x: typing.Union[int, date]) -> date:
    if isinstance(x, int):
        return date.fromordinal(x)
    return x


@dataclass
class Community:
    chat_id: int  # Telegram chat id
    name: str = ''
    members: typing.List[int] = field(default_factory=list)
    pool: typing.List[int] = field(default_factory=list)  # [user_id]
    polled: typing.Dict[int, date] = field(default_factory=dict)   # Days since the user was asked
    scheduled_meetings: typing.List[typing.Tuple[int, int, date]] = field(
        default_factory=list)  # (user_id_1, user_id_2, meeting date)
    archived_meetings: typing.List[typing.Tuple[int, int, date]] = field(default_factory=list)
    default_answers: typing.Dict[int, bool] = field(default_factory=dict)   # Last answers
    start_timestamp: int = field(default_factory=lambda: int(time.time()))

    def dict(self) -> dict:
        data = asdict(self)
        data['polled'] = {str(k): self.polled[k].toordinal() for k in self.polled}
        data['default_answers'] = {str(k): self.default_answers[k] for k in self.default_answers}
        data['scheduled_meetings'] = [(l, m, r.toordinal()) for l, m, r in self.scheduled_meetings]
        data['archived_meetings'] = [(l, m, r.toordinal()) for l, m, r in self.archived_meetings]
        return data

    @classmethod
    def from_dict(cls, data: dict) -> Community:
        data = getattr(data, '__dict__', data)
        data_ = {key: data[key] for key in data.keys() if
                 key in ['chat_id', 'name', 'members', 'pool', 'polled', 'scheduled_meetings',
                         'archived_meetings', 'start_timestamp', 'default_answers']}
        self = cls(**data_)
        self.polled = {int(k): convert_to_date(self.polled[k]) for k in self.polled}
        self.default_answers = {int(k): self.default_answers[k] for k in self.default_answers}
        self.scheduled_meetings = [(int(l), int(m), convert_to_date(r)) for l, m, r in self.scheduled_meetings]
        self.archived_meetings = [(int(l), int(m), convert_to_date(r)) for l, m, r in self.archived_meetings]
        return self

    @classmethod
    def by_id(cls, chat_id: int, bot: Bot, create_if_not_exists=True) -> typing.Optional[Community]:
        data = bot.get_community_from_db({'chat_id': chat_id}, create_if_not_exists)
        if data is None:
            return None

        def upd_data():
            chat: Chat = bot.get_chat(chat_id)
            data.name = chat.title
            bot.save_community(data)

        Thread(target=upd_data).start()
        return data

    def add_member(self, user_id: int, bot: Bot) -> bool:
        chat_member_info: ChatMember = bot.get_chat_member(self.chat_id, user_id)
        if chat_member_info.is_member or chat_member_info.status in ['creator', 'administrator', 'admin', 'member']:
            self.members.append(user_id)
            bot.save_community(self)
            return True
        return False

    def users_to_poll(self) -> typing.List[int]:
        return [
            user_id for user_id in self.members
            if user_id not in self.polled or self.polled[user_id] <= date.today() - timedelta(days=7)
        ]

    def add_answer(self, user_id: typing.Union[int, bool], answer: bool, bot: Bot):
        answer = bool(answer)
        if user_id not in self.users_to_poll():
            return
        if user_id in self.pool:
            self.pool.remove(user_id)
        self.pool += [user_id] * answer
        self.default_answers[user_id] = bool(answer)
        bot.save_community(self)

    def have_already_met(self, user_id_1: int, user_id_2: int) -> bool:
        """
        return True if there is a meeting with these users not earlier than 6 weeks ago
        """
        return any(
            {l, m} == {user_id_1, user_id_2} and r > date.today() - timedelta(days=42)
            for l, m, r in self.scheduled_meetings)

    def schedule_meetings(self):
        random.shuffle(self.pool)   # It's called RandomTea for a reason
        today = date.today()
        while len(self.pool) > 1:
            user_id_1 = self.pool.pop()
            while (user_id_2 := self.pool.pop()) == user_id_1 or self.have_already_met(user_id_1, user_id_2):
                continue
            self.scheduled_meetings.append((user_id_1, user_id_2, today))