import base64

from .oauth import BaseOAuth2


class ZoomOAuth2(BaseOAuth2):
    """
    Zoom OAuth2 authentication backend
    Doc Reference: https://marketplace.zoom.us/docs/guides/auth/oauth
    """

    name = "zoom-oauth2"
    AUTHORIZATION_URL = "https://zoom.us/oauth/authorize"
    ACCESS_TOKEN_URL = "https://zoom.us/oauth/token"
    USER_DETAILS_URL = "https://api.zoom.us/v2/users/me"
    DEFAULT_SCOPE = ["user:read"]
    ACCESS_TOKEN_METHOD = "POST"
    REFRESH_TOKEN_METHOD = "POST"
    REDIRECT_STATE = False
    EXTRA_DATA = [("expires_in", "expires")]

    def user_data(self, access_token, *args, **kwargs):
        response = self.get_json(
            self.USER_DETAILS_URL,
            headers={
                "Authorization": "Bearer {access_token}".format(
                    access_token=access_token
                )
            },
        )
        return response

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

    def auth_complete_params(self, state=None):
        return {
            "grant_type": "authorization_code",  # request auth code
            "code": self.data.get("code", ""),  # server response code
            "redirect_uri": self.get_redirect_uri(state),
        }

    def auth_headers(self):
        return {
            "Authorization": b"Basic "
            + base64.urlsafe_b64encode(
                "{}:{}".format(*self.get_key_and_secret()).encode()
            )
        }

    def refresh_token_params(self, token, *args, **kwargs):
        return {"refresh_token": token, "grant_type": "refresh_token"}