# app/src/telegram/live/runner.py

from __future__ import annotations

import asyncio
from dataclasses import dataclass
from typing import Callable

from aiogram import Bot
from aiogram.exceptions import TelegramBadRequest


@dataclass(slots=True)
class LiveScreen:
    # имя live-экрана: market / portfolio
    screen: str

    # Telegram bot instance
    bot: Bot

    # чат, где находится live-экран
    chat_id: int

    # сообщение, которое нужно автообновлять
    message_id: int

    # функция сборки текста экрана
    render_text: Callable[[], str]

    # функция сборки клавиатуры экрана
    render_markup: Callable[[], object]

    # интервал обновления в секундах
    interval_seconds: int = 5


@dataclass(slots=True)
class StaticScreen:
    # имя статичного экрана: journal / monitoring / etc
    screen: str

    # Telegram bot instance
    bot: Bot

    # чат, где находится экран
    chat_id: int

    # сообщение экрана
    message_id: int


class ScreenRegistry:
    _screens: dict[str, list[StaticScreen]] = {}

    # зарегистрировать статичный экран
    @classmethod
    def register_screen(cls, static_screen: StaticScreen) -> None:
        screens = cls._screens.setdefault(static_screen.screen, [])

        screens[:] = [
            item
            for item in screens
            if not (
                item.chat_id == static_screen.chat_id
                and item.message_id == static_screen.message_id
            )
        ]

        screens.append(static_screen)
    
    # удалить конкретное сообщение из всех статичных экранов без удаления из Telegram
    @classmethod
    def unregister_message(
        cls,
        *,
        chat_id: int,
        message_id: int,
    ) -> None:
        empty_screens: list[str] = []

        for screen, screens in cls._screens.items():
            screens[:] = [
                item
                for item in screens
                if not (
                    item.chat_id == chat_id
                    and item.message_id == message_id
                )
            ]

            if not screens:
                empty_screens.append(screen)

        for screen in empty_screens:
            cls._screens.pop(screen, None)

    # удалить старые статичные экраны указанного типа
    @classmethod
    async def delete_screen(
        cls,
        *,
        screen: str,
        bot: Bot,
        chat_id: int,
    ) -> None:
        screens = cls._screens.get(screen, [])
        remaining: list[StaticScreen] = []

        for static_screen in screens:
            if static_screen.chat_id != chat_id:
                remaining.append(static_screen)
                continue

            try:
                await bot.delete_message(
                    chat_id=static_screen.chat_id,
                    message_id=static_screen.message_id,
                )
            except Exception:
                pass

        if remaining:
            cls._screens[screen] = remaining
        else:
            cls._screens.pop(screen, None)


class LiveScreenRunner:
    _screens: dict[str, list[LiveScreen]] = {}
    _tasks: dict[str, asyncio.Task] = {}

    # зарегистрировать live-экран
    @classmethod
    def register_screen(cls, live_screen: LiveScreen) -> None:
        screens = cls._screens.setdefault(live_screen.screen, [])

        screens[:] = [
            item
            for item in screens
            if not (
                item.chat_id == live_screen.chat_id
                and item.message_id == live_screen.message_id
            )
        ]

        screens.append(live_screen)
    
    # удалить конкретное сообщение из всех live-экранов без удаления из Telegram
    @classmethod
    def unregister_message(
        cls,
        *,
        chat_id: int,
        message_id: int,
    ) -> None:
        empty_screens: list[str] = []

        for screen, screens in cls._screens.items():
            screens[:] = [
                item
                for item in screens
                if not (
                    item.chat_id == chat_id
                    and item.message_id == message_id
                )
            ]

            if not screens:
                empty_screens.append(screen)

        for screen in empty_screens:
            cls._screens.pop(screen, None)

    # удалить все live-экраны указанного типа из Telegram
    @classmethod
    async def delete_screen(
        cls,
        *,
        screen: str,
        bot: Bot,
        chat_id: int,
    ) -> None:
        screens = cls._screens.get(screen, [])
        remaining: list[LiveScreen] = []

        for live_screen in screens:
            if live_screen.chat_id != chat_id:
                remaining.append(live_screen)
                continue

            try:
                await bot.delete_message(
                    chat_id=live_screen.chat_id,
                    message_id=live_screen.message_id,
                )
            except Exception:
                pass

        if remaining:
            cls._screens[screen] = remaining
        else:
            cls._screens.pop(screen, None)

    # запустить автообновление группы экранов
    @classmethod
    def start(cls, screen: str) -> None:
        task = cls._tasks.get(screen)

        if task is not None and not task.done():
            return

        cls._tasks[screen] = asyncio.create_task(cls._worker(screen))

    # остановить автообновление группы экранов
    @classmethod
    def stop(cls, screen: str) -> None:
        task = cls._tasks.get(screen)

        if task is None:
            return

        task.cancel()
        cls._tasks.pop(screen, None)

    # фоновый цикл обновления группы экранов
    @classmethod
    async def _worker(cls, screen: str) -> None:
        while True:
            await cls._refresh_screen(screen)
            await asyncio.sleep(cls._screen_interval(screen))

    # получить интервал обновления группы экранов
    @classmethod
    def _screen_interval(cls, screen: str) -> int:
        screens = cls._screens.get(screen, [])
        if not screens:
            return 5

        return screens[0].interval_seconds

    # обновить все Telegram-сообщения live-экрана
    @classmethod
    async def _refresh_screen(cls, screen: str) -> None:
        screens = cls._screens.get(screen, [])
        if not screens:
            return

        alive_screens: list[LiveScreen] = []

        for live_screen in screens:
            try:
                await live_screen.bot.edit_message_text(
                    chat_id=live_screen.chat_id,
                    message_id=live_screen.message_id,
                    text=live_screen.render_text(),
                    reply_markup=live_screen.render_markup(),
                )
                alive_screens.append(live_screen)

            except TelegramBadRequest as exc:
                if "message is not modified" in str(exc).lower():
                    alive_screens.append(live_screen)
                    continue

            except Exception:
                pass

        if alive_screens:
            cls._screens[screen] = alive_screens
        else:
            cls._screens.pop(screen, None)