import asyncio
import contextlib
from typing import Callable, Coroutine, Any, Union, List, Dict, Optional, TypeVar, Type, TYPE_CHECKING, Awaitable

from telegram.error import RetryAfter
from telegram.ext import BaseRateLimiter, ApplicationHandlerStop

from utils.log import logger

if TYPE_CHECKING:
    from gram_core.application import Application

JSONDict: Type[dict[str, Any]] = Dict[str, Any]
RL_ARGS = TypeVar("RL_ARGS")
T_CalledAPIFunc = Callable[[str, Dict[str, Any], Union[bool, JSONDict, List[JSONDict]]], Awaitable[Any]]


class RateLimiter(BaseRateLimiter[int]):
    _lock = asyncio.Lock()
    __slots__ = (
        "_limiter_info",
        "_retry_after_event",
        "_application",
    )

    def __init__(self):
        self._limiter_info: Dict[Union[str, int], float] = {}
        self._retry_after_event = asyncio.Event()
        self._retry_after_event.set()
        self._application: Optional["Application"] = None

    async def process_request(
        self,
        callback: Callable[..., Coroutine[Any, Any, Union[bool, JSONDict, List[JSONDict]]]],
        args: Any,
        kwargs: Dict[str, Any],
        endpoint: str,
        data: Dict[str, Any],
        rate_limit_args: Optional[RL_ARGS],
    ) -> Union[bool, JSONDict, List[JSONDict]]:
        chat_id = data.get("chat_id")

        with contextlib.suppress(ValueError, TypeError):
            chat_id = int(chat_id)

        loop = asyncio.get_running_loop()
        time = loop.time()

        await self._retry_after_event.wait()

        async with self._lock:
            chat_limit_time = self._limiter_info.get(chat_id)
            if chat_limit_time:
                if time >= chat_limit_time:
                    raise ApplicationHandlerStop
                del self._limiter_info[chat_id]

        try:
            result = await callback(*args, **kwargs)
            await self._on_called_api(endpoint, data, result)
            return result
        except RetryAfter as exc:
            if endpoint == "setWebhook" and exc.retry_after == 1:
                # webhook 已被正确设置
                return True
            logger.warning("chat_id[%s] 触发洪水限制 当前被服务器限制 retry_after[%s]秒", chat_id, exc.retry_after)
            self._limiter_info[chat_id] = time + (exc.retry_after * 2)
            sleep = exc.retry_after + 0.1
            self._retry_after_event.clear()
            await asyncio.sleep(sleep)
        finally:
            self._retry_after_event.set()

    async def initialize(self) -> None:
        pass

    async def shutdown(self) -> None:
        pass

    def set_application(self, application: "Application") -> None:
        self._application = application

    async def _on_called_api(
        self,
        endpoint: str,
        data: Dict[str, Any],
        result: Union[bool, JSONDict, List[JSONDict]],
    ) -> None:
        if funcs := [hook(endpoint, data, result) for hook in self._application.get_called_api_funcs()]:
            try:
                await asyncio.gather(*funcs)
            except Exception as e:
                logger.error("Error while running CalledAPI hooks: %s", e)