"""
Twitch OAuth2 backend, docs at:
    https://python-social-auth.readthedocs.io/en/latest/backends/twitch.html
"""

from .oauth import BaseOAuth2
from .open_id_connect import OpenIdConnectAuth


class TwitchOpenIdConnect(OpenIdConnectAuth):
    """Twitch OpenID Connect authentication backend"""

    name = "twitch"
    USERNAME_KEY = "preferred_username"
    OIDC_ENDPOINT = "https://id.twitch.tv/oauth2"
    DEFAULT_SCOPE = ["openid", "user:read:email"]
    TWITCH_CLAIMS = (
        '{"id_token":{"email": null,"email_verified":null,"preferred_username":null}}'
    )

    def auth_params(self, state=None):
        params = super().auth_params(state)
        # Twitch uses a non-compliant OpenID implementation where the claims must be passed as a param
        params["claims"] = self.TWITCH_CLAIMS
        return params

    def get_user_details(self, response):
        assert self.id_token, "No id_token to parse"

        return {
            "username": self.id_token["preferred_username"],
            "email": self.id_token["email"],
            # Twitch does not provide this information
            "fullname": "",
            "first_name": "",
            "last_name": "",
        }


class TwitchOAuth2(BaseOAuth2):
    """Twitch OAuth authentication backend"""

    name = "twitch"
    ID_KEY = "_id"
    AUTHORIZATION_URL = "https://id.twitch.tv/oauth2/authorize"
    ACCESS_TOKEN_URL = "https://id.twitch.tv/oauth2/token"
    DEFAULT_SCOPE = ["user:read:email"]
    REDIRECT_STATE = False

    def get_user_id(self, details, response):
        """
        Use twitch user id as unique id
        """
        return response.get("id")

    def get_user_details(self, response):
        return {
            "username": response.get("login"),
            "email": response.get("email"),
            "first_name": "",
            "last_name": "",
        }

    def user_data(self, access_token, *args, **kwargs):
        client_id, _ = self.get_key_and_secret()
        auth_headers = {
            "Authorization": f"Bearer {access_token}",
            "Client-Id": client_id,
        }
        url = "https://api.twitch.tv/helix/users"

        data = self.get_json(url, headers=auth_headers)

        return data["data"][0] if data.get("data") else {}
