import logging
from ipaddress import IPv4Address
from typing import Any, Dict

import uvicorn
from fastapi import Depends, FastAPI
from fastapi.middleware.cors import CORSMiddleware
from starlette.responses import JSONResponse

from freqtrade.rpc.rpc import RPC, RPCException, RPCHandler

from .uvicorn_threaded import UvicornServer


logger = logging.getLogger(__name__)


class ApiServer(RPCHandler):

    _rpc: RPC
    _config: Dict[str, Any] = {}

    def __init__(self, rpc: RPC, config: Dict[str, Any]) -> None:
        super().__init__(rpc, config)
        self._server = None

        ApiServer._rpc = rpc
        ApiServer._config = config
        api_config = self._config['api_server']

        self.app = FastAPI(title="Freqtrade API",
                           openapi_url='openapi.json' if api_config.get(
                               'enable_openapi') else None,
                           redoc_url=None,
                           )
        self.configure_app(self.app, self._config)

        self.start_api()

    def cleanup(self) -> None:
        """ Cleanup pending module resources """
        if self._server:
            logger.info("Stopping API Server")
            self._server.cleanup()

    def send_msg(self, msg: Dict[str, str]) -> None:
        pass

    def handle_rpc_exception(self, request, exc):
        logger.exception(f"API Error calling: {exc}")
        return JSONResponse(
            status_code=502,
            content={'error': f"Error querying {request.url.path}: {exc.message}"}
        )

    def configure_app(self, app: FastAPI, config):
        from .api_auth import http_basic_or_jwt_token, router_login
        from .api_v1 import router as api_v1
        from .api_v1 import router_public as api_v1_public
        app.include_router(api_v1_public, prefix="/api/v1")

        app.include_router(api_v1, prefix="/api/v1",
                           dependencies=[Depends(http_basic_or_jwt_token)],
                           )
        app.include_router(router_login, prefix="/api/v1", tags=["auth"])

        app.add_middleware(
            CORSMiddleware,
            allow_origins=config['api_server'].get('CORS_origins', []),
            allow_credentials=True,
            allow_methods=["*"],
            allow_headers=["*"],
        )

        app.add_exception_handler(RPCException, self.handle_rpc_exception)

    def start_api(self):
        """
        Start API ... should be run in thread.
        """
        rest_ip = self._config['api_server']['listen_ip_address']
        rest_port = self._config['api_server']['listen_port']

        logger.info(f'Starting HTTP Server at {rest_ip}:{rest_port}')
        if not IPv4Address(rest_ip).is_loopback:
            logger.warning("SECURITY WARNING - Local Rest Server listening to external connections")
            logger.warning("SECURITY WARNING - This is insecure please set to your loopback,"
                           "e.g 127.0.0.1 in config.json")

        if not self._config['api_server'].get('password'):
            logger.warning("SECURITY WARNING - No password for local REST Server defined. "
                           "Please make sure that this is intentional!")

        if (self._config['api_server'].get('jwt_secret_key', 'super-secret')
                in ('super-secret, somethingrandom')):
            logger.warning("SECURITY WARNING - `jwt_secret_key` seems to be default."
                           "Others may be able to log into your bot.")

        logger.info('Starting Local Rest Server.')
        verbosity = self._config['api_server'].get('verbosity', 'info')
        uvconfig = uvicorn.Config(self.app,
                                  port=rest_port,
                                  host=rest_ip,
                                  access_log=True if verbosity != 'error' else False,
                                  )
        try:
            self._server = UvicornServer(uvconfig)
            self._server.run_in_thread()
        except Exception:
            logger.exception("Api server failed to start.")