from extensions import db
from datetime import datetime

class NotepadKey(db.Model):
    __tablename__ = 'notepad_key'

    id = db.Column(db.Integer, primary_key=True)
    notepad_id = db.Column(db.Integer, db.ForeignKey('notepad.id', ondelete='CASCADE'), nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id', ondelete='CASCADE'), nullable=False)
    encrypted_key = db.Column(db.Text, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    user = db.relationship('User', backref=db.backref('notepad_keys', cascade='all, delete-orphan', lazy='dynamic'))

    __table_args__ = (
        db.UniqueConstraint('notepad_id', 'user_id', name='unique_notepad_key_user'),
    )

    def __init__(self, **kwargs):
        super().__init__(**kwargs)

    def to_dict(self):
        return {
            'id': self.id,
            'notepad_id': self.notepad_id,
            'user_id': self.user_id,
            'encrypted_key': self.encrypted_key,
            'created_at': self.created_at.isoformat() if self.created_at else None
        }