"""
FastAPI router for authentication endpoints.
"""

from fastapi import APIRouter
from fastapi.responses import JSONResponse

from .. import environment_vars as env_vars
from .. import logger
from ..constants import Auth0
from ..responses import json_200_data

logger = logger.new_logger(__name__)

ROUTE: str = "/auth"


def create_router(*args, **kwargs):
    """Create FastAPI router."""

    app = APIRouter()

    @app.get("/config", response_class=JSONResponse)
    async def get_auth0_config():
        """Returns the Auth0 tenant configuration. This endpoint is NOT protected by
        the Auth0 middleware, as it is used to retrieve the Auth0 configuration for
        the frontend, before the frontend attempts to authenticate with Auth0.

        The configuration settings are to be provided via environment variables
        """
        credentials = {Auth0.CLIENT_ID, Auth0.CLIENT_SECRET}
        auth0_config = {
            k: v for k, v in env_vars.AUTH0_SETTINGS.items() if k not in credentials
        }
        return json_200_data(auth0_config)

    return app