from app import db
from app.utils.time_utils import now_eastern

class Facility(db.Model):
    __tablename__ = 'facilities'

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(255), nullable=False)
    address = db.Column(db.Text)
    contact_person = db.Column(db.String(100))
    contact_phone = db.Column(db.String(20))
    active = db.Column(db.Boolean, default=True)
    created_at = db.Column(db.DateTime, default=now_eastern, nullable=True)

    # Phase 1: link facility to a project (nullable for backward compatibility)
    project_id = db.Column(db.Integer, db.ForeignKey('projects.id', ondelete='SET NULL'),
                           nullable=True, index=True)

    # phase38: unguessable token behind the public QR scan page (/f/<token>).
    # NULL until first requested — ensure_qr_token() generates it lazily.
    qr_token = db.Column(db.String(64), unique=True, nullable=True)

    # Relationships
    areas = db.relationship('Area', backref='facility', lazy='dynamic')
    inspections = db.relationship('Inspection', backref='facility', lazy='dynamic')

    def ensure_qr_token(self):
        """Generate the QR token on first use. Caller commits."""
        if not self.qr_token:
            import secrets
            self.qr_token = secrets.token_urlsafe(32)
        return self.qr_token

    def __repr__(self):
        return f'<Facility {self.name}>'

class Area(db.Model):
    __tablename__ = 'areas'

    id = db.Column(db.Integer, primary_key=True)
    facility_id = db.Column(db.Integer, db.ForeignKey('facilities.id'), nullable=False)
    name = db.Column(db.String(255), nullable=False)
    area_type = db.Column(db.String(50))

    # Relationships
    inspections = db.relationship('Inspection', backref='area', lazy='dynamic')
    issues = db.relationship('Issue', backref='area', lazy='dynamic')

    def __repr__(self):
        return f'<Area {self.name}>'