#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import json
import logging
from typing import Optional
from ipaddress import IPv4Address

import uvicorn
from fastapi.security import OAuth2PasswordBearer
from starlette.websockets import WebSocketDisconnect
from fastapi import Body, FastAPI, WebSocket as FastAPIWebSocket

from nonebot.log import logger
from nonebot.config import Config
from nonebot.drivers import BaseDriver, BaseWebSocket
from nonebot.adapters.cqhttp import Bot as CQBot


class Driver(BaseDriver):

    def __init__(self, config: Config):
        self._server_app = FastAPI(
            debug=config.debug,
            openapi_url=None,
            docs_url=None,
            redoc_url=None,
        )

        self.config = config

        self._server_app.post("/{adapter}/")(self._handle_http)
        self._server_app.post("/{adapter}/http")(self._handle_http)
        self._server_app.websocket("/{adapter}/ws")(self._handle_ws_reverse)
        self._server_app.websocket("/{adapter}/ws/")(self._handle_ws_reverse)

    @property
    def server_app(self):
        return self._server_app

    @property
    def asgi(self):
        return self._server_app

    @property
    def logger(self):
        return logging.getLogger("fastapi")

    def run(self,
            host: Optional[IPv4Address] = None,
            port: Optional[int] = None,
            *,
            app: Optional[str] = None,
            **kwargs):
        LOGGING_CONFIG = {
            "version": 1,
            "disable_existing_loggers": False,
            "formatters": {
                "default": {
                    "()": "logging.Formatter",
                    "fmt": "[%(asctime)s %(name)s] %(levelname)s: %(message)s",
                },
            },
            "handlers": {
                "default": {
                    "formatter": "default",
                    "class": "logging.StreamHandler",
                    "stream": "ext://sys.stdout",
                },
            },
            "loggers": {
                "uvicorn.error": {
                    "handlers": ["default"],
                    "level": "INFO"
                },
                "uvicorn.access": {
                    "handlers": ["default"],
                    "level": "INFO",
                },
            },
        }
        uvicorn.run(app or self.server_app,
                    host=host or str(self.config.host),
                    port=port or self.config.port,
                    reload=app and self.config.debug,
                    debug=self.config.debug,
                    log_config=LOGGING_CONFIG,
                    **kwargs)

    async def _handle_http(self,
                           adapter: str,
                           data: dict = Body(...),
                           access_token: str = OAuth2PasswordBearer(
                               "/", auto_error=False)):
        # TODO: Check authorization
        logger.debug(f"Received message: {data}")
        if adapter == "cqhttp":
            bot = CQBot("http", self.config)
            await bot.handle_message(data)
        return {"status": 200, "message": "success"}

    async def _handle_ws_reverse(self,
                                 adapter: str,
                                 websocket: FastAPIWebSocket,
                                 access_token: str = OAuth2PasswordBearer(
                                     "/", auto_error=False)):
        websocket = WebSocket(websocket)

        # TODO: Check authorization
        await websocket.accept()

        while not websocket.closed:
            data = await websocket.receive()

            if not data:
                continue

            logger.debug(f"Received message: {data}")
            if adapter == "cqhttp":
                bot = CQBot("websocket", self.config, websocket=websocket)
                await bot.handle_message(data)


class WebSocket(BaseWebSocket):

    def __init__(self, websocket: FastAPIWebSocket):
        super().__init__(websocket)
        self._closed = None

    @property
    def closed(self):
        return self._closed

    async def accept(self):
        await self.websocket.accept()
        self._closed = False

    async def close(self):
        await self.websocket.close()
        self._closed = True

    async def receive(self) -> Optional[dict]:
        data = None
        try:
            data = await self.websocket.receive_json()
        except ValueError:
            logger.debug("Received an invalid json message.")
        except WebSocketDisconnect:
            self._closed = True
            logger.error("WebSocket disconnected by peer.")

        return data

    async def send(self, data: dict) -> None:
        await self.websocket.send_json(data)