from datetime import datetime, timedelta, timezone

from . import ModelSerializeMixin, UtcDateTime
from .user import User
from flaschengeist.database import db
from secrets import compare_digest
from flaschengeist import logger


class Session(db.Model, ModelSerializeMixin):
    """Model for a Session

    Args:
        expires: Is a Datetime from current Time.
        user:   Is an User.
        token:  String to verify access later.
    """

    __tablename__ = "session"
    expires: datetime = db.Column(UtcDateTime)
    token: str = db.Column(db.String(32), unique=True)
    lifetime: int = db.Column(db.Integer)
    browser: str = db.Column(db.String(30))
    platform: str = db.Column(db.String(30))

    _id = db.Column("id", db.Integer, primary_key=True)
    _user: User = db.relationship("User", back_populates="_sessions")
    _user_id = db.Column("user_id", db.Integer, db.ForeignKey("user.id"))

    def refresh(self):
        """Update the Timestamp

        Update the Timestamp to the current Time.
        """
        logger.debug("update timestamp from session with token {{ {} }}".format(self))
        self.expires = datetime.now(timezone.utc) + timedelta(seconds=self.lifetime)

    def __eq__(self, token):
        return compare_digest(self.token, token)