import uuid
from datetime import datetime
from app import db


class Guest(db.Model):
    __tablename__ = "guests"

    id = db.Column(db.Integer, primary_key=True)
    department = db.Column(db.String(255), nullable=False)
    full_name = db.Column(db.String(255), nullable=False)
    position = db.Column(db.String(255), nullable=True)
    email = db.Column(db.String(255), nullable=False)
    photo_filename = db.Column(db.String(255), nullable=True)
    token = db.Column(db.String(36), unique=True, nullable=False, default=lambda: str(uuid.uuid4()))
    qr_filename = db.Column(db.String(255), nullable=True)
    is_active = db.Column(db.Boolean, default=True, nullable=False)
    invitation_sent = db.Column(db.Boolean, default=False, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    check_ins = db.relationship("CheckIn", backref="guest", lazy=True, cascade="all, delete-orphan")

    @property
    def is_checked_in(self):
        return len(self.check_ins) > 0

    @property
    def last_check_in(self):
        if not self.check_ins:
            return None
        return max(check_in.checked_in_at for check_in in self.check_ins)

    def __repr__(self):
        return f"<Guest {self.full_name} ({self.email})>"


class CheckIn(db.Model):
    __tablename__ = "check_ins"

    id = db.Column(db.Integer, primary_key=True)
    guest_id = db.Column(db.Integer, db.ForeignKey("guests.id"), nullable=False)
    checked_in_at = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
    device_info = db.Column(db.String(500), nullable=True)

    def __repr__(self):
        return f"<CheckIn guest_id={self.guest_id} at={self.checked_in_at}>"