from flask_sqlalchemy import SQLAlchemy
from flask_login import UserMixin
from datetime import datetime
from . import db


class User(UserMixin, db.Model):
    __tablename__ = "users"

    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), unique=True, nullable=False)
    email = db.Column(db.String(120), unique=True, nullable=False)
    password_hash = db.Column(db.String(256), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    documents = db.relationship("Document", backref="owner", lazy=True, cascade="all, delete-orphan")
    url_contexts = db.relationship("UrlContext", backref="owner", lazy=True, cascade="all, delete-orphan")
    chat_sessions = db.relationship("ChatSession", backref="owner", lazy=True, cascade="all, delete-orphan")

    def __repr__(self):
        return f"<User {self.username}>"