import json

from typing import Any, Tuple, Union, Optional, TYPE_CHECKING

from nonebot.log import logger
from nonebot.typing import overrides
from nonebot.message import handle_event
from nonebot.adapters import Bot as BaseBot
from nonebot.drivers import Driver, HTTPRequest, HTTPResponse

from .config import Config as FeishuConfig
from .event import Event, get_event_model
from .message import Message, MessageSegment
from .utils import log, AESCipher

if TYPE_CHECKING:
    from nonebot.config import Config


async def _check_reply(bot: "Bot", event: "Event"):
    """
    :说明:

      检查消息中存在的回复，去除并赋值 ``event.reply``, ``event.to_me``

    :参数:

      * ``bot: Bot``: Bot 对象
      * ``event: Event``: Event 对象
    """
    ...


def _check_at_me(bot: "Bot", event: "Event"):
    """
    :说明:

      检查消息开头或结尾是否存在 @机器人，去除并赋值 ``event.to_me``

    :参数:

      * ``bot: Bot``: Bot 对象
      * ``event: Event``: Event 对象
    """
    ...


def _check_nickname(bot: "Bot", event: "Event"):
    """
    :说明:

      检查消息开头是否存在，去除并赋值 ``event.to_me``

    :参数:

      * ``bot: Bot``: Bot 对象
      * ``event: Event``: Event 对象
    """
    ...


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

    @property
    def type(self) -> str:
        return "feishu"

    @classmethod
    def register(cls, driver: Driver, config: "Config"):
        super().register(driver, config)
        cls.feishu_config = FeishuConfig(**config.dict())

    @classmethod
    @overrides(BaseBot)
    async def check_permission(
            cls, driver: Driver, request: HTTPRequest
    ) -> Tuple[Optional[str], Optional[HTTPResponse]]:
        if not isinstance(request, HTTPRequest):
            log("WARNING",
                "Unsupported connection type, available type: `http`")
            return None, HTTPResponse(
                405, b"Unsupported connection type, available type: `http`")

        encrypt_key = cls.feishu_config.encrypt_key
        if encrypt_key:
            encrypted = json.loads(request.body)["encrypt"]
            decrypted = AESCipher(encrypt_key).decrypt_string(encrypted)
            data = json.loads(decrypted)
        else:
            data = json.loads(request.body)

        challenge = data.get("challenge")
        if challenge:
            return data.get("token"), HTTPResponse(
                200,
                json.dumps({
                    "challenge": challenge
                }).encode())

        headers = data.get("header")
        if headers:
            token = headers.get("token")
            app_id = headers.get("app_id")
        else:
            log("WARNING", "Missing `header` in POST body")
            return None, HTTPResponse(400, b"Missing `header` in POST body")

        if not token:
            log("WARNING", "Missing `verification token` in POST body")
            return None, HTTPResponse(
                400, b"Missing `verification token` in POST body")
        else:
            if token != cls.feishu_config.verification_token:
                log("WARNING", "Verification token check failed")
                return None, HTTPResponse(403,
                                          b"Verification token check failed")

        return app_id, HTTPResponse(200, b'')

    async def handle_message(self, message: bytes):
        """
        :说明:

          处理事件并转换为 `Event <#class-event>`_
        """
        data = json.loads(message)
        print(data)
        if data.get("type") == "url_verification":
            return

        try:
            header = data["header"]
            event_type = header["event_type"]
            models = get_event_model(event_type)
            for model in models:
                try:
                    event = model.parse_obj(data)
                    break
                except Exception as e:
                    log("DEBUG", "Event Parser Error", e)
            else:
                event = Event.parse_obj(data)
            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>"
            )

    async def _call_api(self, api: str, **data) -> Any:
        raise NotImplementedError

    async def send(self, event: Event, message: Union[str, Message,
                                                      MessageSegment],
                   **kwargs) -> Any:
        raise NotImplementedError