import httpx
from datetime import datetime

from nonebot.log import logger
from nonebot.config import Config
from nonebot.adapters import BaseBot
from nonebot.message import handle_event
from nonebot.typing import Driver, NoReturn
from nonebot.typing import Any, Union, Optional
from nonebot.exception import NetworkError, RequestDenied, ApiNotAvailable

from .event import Event
from .model import MessageModel
from .utils import check_legal, log
from .message import Message, MessageSegment
from .exception import ApiError, SessionExpired


class Bot(BaseBot):
    """
    钉钉 协议 Bot 适配。继承属性参考 `BaseBot <./#class-basebot>`_ 。
    """

    def __init__(self, driver: Driver, connection_type: str, config: Config,
                 self_id: str, **kwargs):

        super().__init__(driver, connection_type, config, self_id, **kwargs)

    @property
    def type(self) -> str:
        """
        - 返回: ``"ding"``
        """
        return "ding"

    @classmethod
    async def check_permission(cls, driver: Driver, connection_type: str,
                               headers: dict,
                               body: Optional[dict]) -> Union[str, NoReturn]:
        """
        :说明:

          钉钉协议鉴权。参考 `鉴权 <https://ding-doc.dingtalk.com/doc#/serverapi2/elzz1p>`_
        """
        timestamp = headers.get("timestamp")
        sign = headers.get("sign")

        # 检查 timestamp
        if not timestamp:
            raise RequestDenied(400, "Missing `timestamp` Header")
        # 检查 sign
        if not sign:
            raise RequestDenied(400, "Missing `sign` Header")
        # 校验 sign 和 timestamp，判断是否是来自钉钉的合法请求
        if not check_legal(timestamp, sign, driver):
            raise RequestDenied(403, "Signature is invalid")
        # 检查连接方式
        if connection_type not in ["http"]:
            raise RequestDenied(405, "Unsupported connection type")

        access_token = driver.config.access_token
        if access_token and access_token != access_token:
            raise RequestDenied(
                403, "Authorization Header is invalid"
                if access_token else "Missing Authorization Header")
        return body.get("chatbotUserId")

    async def handle_message(self, body: dict):
        message = MessageModel.parse_obj(body)
        if not message:
            return

        try:
            event = Event(message)
            await handle_event(self, event)
        except Exception as e:
            logger.opt(colors=True, exception=e).error(
                f"<r><bg #f8bbd0>Failed to handle event. Raw: {message}</bg #f8bbd0></r>"
            )
        return

    async def call_api(self, api: str, **data) -> Union[Any, NoReturn]:
        """
        :说明:

          调用 钉钉 协议 API

        :参数:

          * ``api: str``: API 名称
          * ``**data: Any``: API 参数

        :返回:

          - ``Any``: API 调用返回数据

        :异常:

          - ``NetworkError``: 网络错误
          - ``ActionFailed``: API 调用失败
        """
        if self.connection_type != "http":
            log("ERROR", "Only support http connection.")
            return
        if "self_id" in data:
            self_id = data.pop("self_id")
            if self_id:
                bot = self.driver.bots[str(self_id)]
                return await bot.call_api(api, **data)

        log("DEBUG", f"Calling API <y>{api}</y>")

        if api == "send_message":
            raw_event: MessageModel = data["raw_event"]
            # 确保 sessionWebhook 没有过期
            if int(datetime.now().timestamp()) > int(
                    raw_event.sessionWebhookExpiredTime / 1000):
                raise SessionExpired

            target = raw_event.sessionWebhook

            if not target:
                raise ApiNotAvailable

            headers = {}
            segment: MessageSegment = data["message"][0]
            try:
                async with httpx.AsyncClient(headers=headers) as client:
                    response = await client.post(
                        target,
                        params={"access_token": self.config.access_token},
                        json=segment.data,
                        timeout=self.config.api_timeout)

                if 200 <= response.status_code < 300:
                    result = response.json()
                    if isinstance(result, dict):
                        if result.get("errcode") != 0:
                            raise ApiError(errcode=result.get("errcode"),
                                           errmsg=result.get("errmsg"))
                        return result
                raise NetworkError(f"HTTP request received unexpected "
                                   f"status code: {response.status_code}")
            except httpx.InvalidURL:
                raise NetworkError("API root url invalid")
            except httpx.HTTPError:
                raise NetworkError("HTTP request failed")

    async def send(self,
                   event: Event,
                   message: Union[str, "Message", "MessageSegment"],
                   at_sender: bool = False,
                   **kwargs) -> Union[Any, NoReturn]:
        """
        :说明:

          根据 ``event``  向触发事件的主体发送消息。

        :参数:

          * ``event: Event``: Event 对象
          * ``message: Union[str, Message, MessageSegment]``: 要发送的消息
          * ``at_sender: bool``: 是否 @ 事件主体
          * ``**kwargs``: 覆盖默认参数

        :返回:

          - ``Any``: API 调用返回数据

        :异常:

          - ``ValueError``: 缺少 ``user_id``, ``group_id``
          - ``NetworkError``: 网络错误
          - ``ActionFailed``: API 调用失败
        """
        msg = message if isinstance(message, Message) else Message(message)

        at_sender = at_sender and bool(event.user_id)
        params = {"raw_event": event.raw_event}
        params.update(kwargs)

        if at_sender and event.detail_type != "private":
            params["message"] = f"@{event.user_id} " + msg
        else:
            params["message"] = msg

        return await self.call_api("send_message", **params)