"""BOT"""

import asyncio
import signal
from functools import wraps
from signal import SIGABRT, SIGINT, SIGTERM, signal as signal_func
from ssl import SSLZeroReturnError
from typing import Callable, List, Optional, TYPE_CHECKING, TypeVar, Union

import pytz
import uvicorn
from fastapi import FastAPI
from starlette.requests import Request
from starlette.responses import Response
from telegram import Bot, Update
from telegram.error import NetworkError, TelegramError, TimedOut
from telegram.ext import (
    Application as TelegramApplication,
    ApplicationBuilder as TelegramApplicationBuilder,
    Defaults,
    JobQueue,
)
from telegram.request import HTTPXRequest
from typing_extensions import ParamSpec
from uvicorn import Server

from gram_core.config import config as application_config
from gram_core.handler.limiterhandler import LimiterHandler
from gram_core.manager import Managers
from gram_core.ratelimiter import RateLimiter
from utils.const import WRAPPER_ASSIGNMENTS
from utils.log import logger
from utils.models.signal import Singleton

if TYPE_CHECKING:
    from asyncio import Task
    from telegram import Bot
    from types import FrameType
    from gram_core.ratelimiter import T_CalledAPIFunc
    from gram_core.handler.hookhandler import T_PreprocessorsFunc

__all__ = ("Application",)

R = TypeVar("R")
T = TypeVar("T")
P = ParamSpec("P")


class Application(Singleton):
    """Application"""

    _web_server_task: Optional["Task"] = None

    _startup_funcs: List[Callable] = []
    _shutdown_funcs: List[Callable] = []
    _called_api_funcs: List["T_CalledAPIFunc"] = []
    _preprocessors_funcs: List["T_PreprocessorsFunc"] = []

    def __init__(self, managers: "Managers", telegram: "TelegramApplication", web_server: "Server") -> None:
        self._running = False
        self.managers = managers
        self.telegram = telegram
        self.web_server = web_server
        self.managers.set_application(application=self)  # 给 managers 设置 application
        self.managers.build_executor("Application")

    @classmethod
    def build(cls):
        managers = Managers()
        rate_limiter = RateLimiter()
        telegram = (
            TelegramApplicationBuilder()
            .get_updates_read_timeout(application_config.update_read_timeout)
            .get_updates_write_timeout(application_config.update_write_timeout)
            .get_updates_connect_timeout(application_config.update_connect_timeout)
            .get_updates_pool_timeout(application_config.update_pool_timeout)
            .defaults(Defaults(tzinfo=pytz.timezone("Asia/Shanghai"), allow_sending_without_reply=True))
            .token(application_config.bot.token)
            .base_url(application_config.bot.base_url)
            .base_file_url(application_config.bot.base_file_url)
            .request(
                HTTPXRequest(
                    connection_pool_size=application_config.connection_pool_size,
                    proxy_url=application_config.proxy_url,
                    read_timeout=application_config.read_timeout,
                    write_timeout=application_config.write_timeout,
                    connect_timeout=application_config.connect_timeout,
                    pool_timeout=application_config.pool_timeout,
                    media_write_timeout=application_config.write_timeout,
                )
            )
            .rate_limiter(rate_limiter)
            .build()
        )
        web_server = Server(
            uvicorn.Config(
                app=FastAPI(debug=application_config.debug),
                port=application_config.webserver.port,
                host=application_config.webserver.host,
                log_config=None,
            )
        )
        instance = cls(managers, telegram, web_server)
        rate_limiter.set_application(instance)
        return instance

    @property
    def running(self) -> bool:
        """bot 是否正在运行"""
        with self._lock:
            return self._running

    @property
    def web_app(self) -> Union["FastAPI", Callable, str]:
        """fastapi app"""
        return self.web_server.config.app

    @property
    def bot(self) -> Optional[Bot]:
        return self.telegram.bot

    @property
    def job_queue(self) -> Optional[JobQueue]:
        return self.telegram.job_queue

    async def _on_startup(self) -> None:
        for func in self._startup_funcs:
            await self.managers.executor(func, block=getattr(func, "block", False))

    async def _on_shutdown(self) -> None:
        for func in self._shutdown_funcs:
            await self.managers.executor(func, block=getattr(func, "block", False))

    async def initialize(self):
        """BOT 初始化"""
        self.telegram.add_handler(LimiterHandler(limit_time=10), group=-1)  # 启用入口洪水限制
        await self.managers.start_dependency()  # 启动基础服务
        await self.managers.init_components()  # 实例化组件
        await self.managers.start_services()  # 启动其他服务
        await self.managers.install_plugins()  # 安装插件

    async def shutdown(self):
        """BOT 关闭"""
        await self.managers.uninstall_plugins()  # 卸载插件
        await self.managers.stop_services()  # 终止其他服务
        await self.managers.stop_dependency()  # 终止基础服务

    async def start(self) -> None:
        """启动 BOT"""
        logger.info("正在启动 BOT 中...")

        await self.telegram.initialize()
        logger.info("[blue]Telegram[/] 初始化成功", extra={"markup": True})

        if application_config.webserver.enable:  # 如果使用 web app
            server_config = self.web_server.config
            server_config.setup_event_loop()
            if not server_config.loaded:
                server_config.load()
            self.web_server.lifespan = server_config.lifespan_class(server_config)
            try:
                await self.web_server.startup()
            except OSError as e:
                if e.errno == 10048:
                    logger.error("Web Server 端口被占用：%s", e)
                logger.error("Web Server 启动失败，正在退出")
                raise SystemExit from None

            if self.web_server.should_exit:
                logger.error("Web Server 启动失败，正在退出")
                raise SystemExit from None
            logger.success("Web Server 启动成功")

            self._web_server_task = asyncio.create_task(self.web_server.main_loop())

        await self.start_bot()

        await self.initialize()
        logger.success("BOT 初始化成功")
        logger.debug("BOT 开始启动")

        await self._on_startup()
        await self.telegram.start()
        self._running = True
        logger.success("BOT 启动成功")

    async def start_bot(self):
        """启动 BOT"""

        def error_callback(exc: TelegramError) -> None:
            """错误信息回调"""
            self.telegram.create_task(self.telegram.process_error(error=exc, update=None))

        if application_config.bot.is_webhook and application_config.webserver.enable:
            self.register_bot_route()
            await self.bot.set_webhook(application_config.bot.webhook_url)
        for _ in range(5):  # 连接至 telegram 服务器
            try:
                if application_config.bot.is_webhook and application_config.webserver.enable:
                    await self.bot.set_webhook(application_config.bot.webhook_url)
                else:
                    await self.bot.delete_webhook()
                    await self.telegram.updater.start_polling(
                        error_callback=error_callback, allowed_updates=Update.ALL_TYPES
                    )
                break
            except TimedOut:
                logger.warning("连接至 [blue]telegram[/] 服务器失败，正在重试", extra={"markup": True})
                continue
            except NetworkError as e:
                logger.exception()
                if isinstance(e, SSLZeroReturnError):
                    logger.error("代理服务出现异常, 请检查您的代理服务是否配置成功.")
                else:
                    logger.error("网络连接出现问题, 请检查您的网络状况.")
                raise SystemExit from e

    def register_bot_route(self):
        """注册 webhook 路由"""

        @self.web_app.post("/telegram")
        async def telegram(request: Request) -> Response:
            """Handle incoming Telegram updates by putting them into the `update_queue`"""
            await self.telegram.updater.update_queue.put(Update.de_json(data=await request.json(), bot=self.bot))
            return Response()

    def stop_signal_handler(self, signum: int):
        """终止信号处理"""
        signals = {k: v for v, k in signal.__dict__.items() if v.startswith("SIG") and not v.startswith("SIG_")}
        logger.debug("接收到了终止信号 %s 正在退出...", signals[signum])
        if self._web_server_task:
            self._web_server_task.cancel()

    async def idle(self) -> None:
        """在接收到中止信号之前，堵塞loop"""

        task = None

        def stop_handler(signum: int, _: "FrameType") -> None:
            self.stop_signal_handler(signum)
            task.cancel()

        for s in (SIGINT, SIGTERM, SIGABRT):
            signal_func(s, stop_handler)

        while True:
            task = asyncio.create_task(asyncio.sleep(600))

            try:
                await task
            except asyncio.CancelledError:
                break

    async def stop(self) -> None:
        """关闭"""
        logger.info("BOT 正在关闭")
        self._running = False

        await self._on_shutdown()

        if self.telegram.updater.running:
            await self.telegram.updater.stop()

        await self.shutdown()

        if self.telegram.running:
            await self.telegram.stop()

        await self.telegram.shutdown()
        if self.web_server is not None:
            try:
                await self.web_server.shutdown()
                logger.info("Web Server 已经关闭")
            except AttributeError:
                pass

        logger.success("BOT 关闭成功")

    def launch(self) -> None:
        """启动"""
        loop = asyncio.get_event_loop()
        try:
            loop.run_until_complete(self.start())
            loop.run_until_complete(self.idle())
        except (SystemExit, KeyboardInterrupt) as exc:
            logger.debug("接收到了终止信号，BOT 即将关闭", exc_info=exc)  # 接收到了终止信号
        except NetworkError as e:
            if isinstance(e, SSLZeroReturnError):
                logger.critical("代理服务出现异常, 请检查您的代理服务是否配置成功.")
            else:
                logger.critical("网络连接出现问题, 请检查您的网络状况.")
        except Exception as e:
            logger.critical("遇到了未知错误: %s", {type(e)}, exc_info=e)
        finally:
            loop.run_until_complete(self.stop())

            if application_config.reload:
                raise SystemExit from None

    def on_startup(self, func: Callable[P, R]) -> Callable[P, R]:
        """注册一个在 BOT 启动时执行的函数"""

        if func not in self._startup_funcs:
            self._startup_funcs.append(func)

        # noinspection PyTypeChecker
        @wraps(func, assigned=WRAPPER_ASSIGNMENTS)
        async def wrapper(*args: P.args, **kwargs: P.kwargs) -> R:
            return func(*args, **kwargs)

        return wrapper

    def on_shutdown(self, func: Callable[P, R]) -> Callable[P, R]:
        """注册一个在 BOT 停止时执行的函数"""

        if func not in self._shutdown_funcs:
            self._shutdown_funcs.append(func)

        # noinspection PyTypeChecker
        @wraps(func, assigned=WRAPPER_ASSIGNMENTS)
        async def wrapper(*args: P.args, **kwargs: P.kwargs) -> R:
            return func(*args, **kwargs)

        return wrapper

    def on_called_api(self, func: "T_CalledAPIFunc") -> Callable[P, R]:
        """注册一个在 BOT 调用 Telegram API 后执行的函数"""

        if func not in self._called_api_funcs:
            self._called_api_funcs.append(func)

        # noinspection PyTypeChecker
        @wraps(func, assigned=WRAPPER_ASSIGNMENTS)
        async def wrapper(*args: P.args, **kwargs: P.kwargs) -> R:
            return func(*args, **kwargs)

        return wrapper

    def get_called_api_funcs(self) -> List["T_CalledAPIFunc"]:
        """获取所有在 BOT 调用 Telegram API 后执行的函数"""
        return self._called_api_funcs

    def run_preprocessor(self, func: "T_PreprocessorsFunc") -> Callable[P, R]:
        """注册一个在 BOT 调用插件函数前执行的函数"""

        if func not in self._preprocessors_funcs:
            self._preprocessors_funcs.append(func)

        # noinspection PyTypeChecker
        @wraps(func, assigned=WRAPPER_ASSIGNMENTS)
        async def wrapper(*args: P.args, **kwargs: P.kwargs) -> R:
            return func(*args, **kwargs)

        return wrapper

    def get_preprocessors_funcs(self) -> List["T_PreprocessorsFunc"]:
        """获取所有在 BOT 调用插件函数前执行的函数"""
        return self._preprocessors_funcs