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

Thanks to [@saily](https://github.com/saily) who published an
implementation for GitLab support on his blog post [Weblate with
GitLab as OAuth provider](http://widerin.net/blog/weblate-gitlab-oauth-login/).
His code was a great reference when working on this implementation.
"""

from .oauth import BaseOAuth2


class GitLabOAuth2(BaseOAuth2):
    """GitLab OAuth authentication backend"""

    name = "gitlab"
    API_URL = "https://gitlab.com"
    AUTHORIZATION_URL = "https://gitlab.com/oauth/authorize"
    ACCESS_TOKEN_URL = "https://gitlab.com/oauth/token"
    ACCESS_TOKEN_METHOD = "POST"
    REDIRECT_STATE = False
    DEFAULT_SCOPE = ["read_user"]
    EXTRA_DATA = [
        ("id", "id"),
        ("expires_in", "expires"),
        ("refresh_token", "refresh_token"),
    ]

    def api_url(self, path):
        api_url = self.setting("API_URL") or self.API_URL
        return "{}{}".format(api_url.rstrip("/"), path)

    def authorization_url(self):
        return self.api_url("/oauth/authorize")

    def access_token_url(self):
        return self.api_url("/oauth/token")

    def get_user_details(self, response):
        """Return user details from GitLab account"""
        fullname, first_name, last_name = self.get_user_names(response.get("name"))
        return {
            "username": response.get("username"),
            "email": response.get("email") or "",
            "fullname": fullname,
            "first_name": first_name,
            "last_name": last_name,
        }

    def user_data(self, access_token, *args, **kwargs):
        """Loads user data from service"""
        return self.get_json(
            self.api_url("/api/v4/user"), params={"access_token": access_token}
        )