"""
LiveJournal OpenId backend, docs at:
    https://python-social-auth.readthedocs.io/en/latest/backends/livejournal.html
"""

from urllib.parse import urlsplit

from ..exceptions import AuthMissingParameter
from .open_id import OpenIdAuth


class LiveJournalOpenId(OpenIdAuth):
    """LiveJournal OpenID authentication backend"""

    name = "livejournal"

    def get_user_details(self, response):
        """Generate username from identity url"""
        values = super().get_user_details(response)
        values["username"] = (
            values.get("username")
            or urlsplit(response.identity_url).netloc.split(".", 1)[0]
        )
        return values

    def openid_url(self):
        """Returns LiveJournal authentication URL"""
        if not self.data.get("openid_lj_user"):
            raise AuthMissingParameter(self, "openid_lj_user")
        return "http://{}.livejournal.com".format(self.data["openid_lj_user"])