import base64

from .oauth import BaseOAuth2


class PayPalOAuth2(BaseOAuth2):
    """
    PayPal OAuth2 backend, docs at:
        https://developer.paypal.com/docs/connect-with-paypal/integrate/
    """

    name = "paypal-oauth2"
    ID_KEY = "user_id"
    AUTHORIZATION_URL = "https://www.paypal.com/connect"
    ACCESS_TOKEN_URL = "https://api.paypal.com/v1/oauth2/token"
    USER_DATA_URL = (
        "https://api.paypal.com/v1/identity/oauth2/userinfo?schema=paypalv1.1"
    )
    DEFAULT_SCOPE = ["openid", "profile"]
    REFRESH_TOKEN_METHOD = "POST"
    REDIRECT_STATE = False

    def user_data(self, access_token, *args, **kwargs):
        auth_header = {"Authorization": f"Bearer {access_token}"}
        return self.get_json(self.USER_DATA_URL, headers=auth_header)

    def get_user_details(self, response):
        username = response.get(self.ID_KEY).split("/")[-1]
        fullname, first_name, last_name = self.get_user_names(
            response.get("name", ""),
            response.get("given_name", ""),
            response.get("family_name", ""),
        )
        emails = response.get("emails", [])
        email = self.get_email(emails)
        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",
            "code": self.data.get("code", ""),
        }

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

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

    @staticmethod
    def get_email(emails):
        if not emails:
            return ""
        primary_emails = (email for email in emails if email.get("primary", False))
        primary_or_first = next(primary_emails, emails[0])
        return primary_or_first.get("value")


class PayPalOAuth2Sandbox(PayPalOAuth2):
    name = "paypal-oauth2-sandbox"
    AUTHORIZATION_URL = "https://www.sandbox.paypal.com/connect"
    ACCESS_TOKEN_URL = "https://api.sandbox.paypal.com/v1/oauth2/token"
    USER_DATA_URL = (
        "https://api.sandbox.paypal.com/v1/identity/oauth2/userinfo?schema=paypalv1.1"
    )