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# Author : Fredrik Thulin <fredrik@thulin.net>
#

"""
User and user database module.
"""
import logging
import warnings
from typing import Optional, Union

from bson import ObjectId

from eduid_userdb import UserDB

from .user import IdPUser

# TODO: Rename to logger
module_logger = logging.getLogger(__name__)


class IdPUserDb(object):
    """
    :param logger: logging logger
    :param userdb: User database
    """

    def __init__(self, logger: Optional[logging.Logger], mongo_uri: str, db_name: str, userdb: UserDB = None):
        self.logger = logger
        if userdb is None:
            userdb = UserDB(mongo_uri, db_name=db_name, user_class=IdPUser)
        self.userdb = userdb

        if self.logger is not None:
            warnings.warn('Object logger deprecated, using module_logger', DeprecationWarning)

    def lookup_user(self, username: Union[str, ObjectId]) -> Optional[IdPUser]:
        """
        Load IdPUser from userdb.

        :param username: Either an e-mail address, an eppn or a user_id.
        :return: user found in database
        """
        _user = None
        if isinstance(username, str):
            if '@' in username:
                _user = self.userdb.get_user_by_mail(username.lower(), raise_on_missing=False)
            if not _user:
                _user = self.userdb.get_user_by_eppn(username.lower(), raise_on_missing=False)
        if not _user:
            # username will be ObjectId if this is a lookup using an existing SSO session
            _user = self.userdb.get_user_by_id(username, raise_on_missing=False)
        return _user
