from flask_sqlalchemy import SQLAlchemy
from flask_login import UserMixin
from datetime import datetime
import bcrypt

db = SQLAlchemy()

class User(UserMixin, db.Model):
    __tablename__ = 'users'
    
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    password_hash = db.Column(db.String(128), nullable=False)
    is_admin = db.Column(db.Boolean, default=False, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    
    feedbacks = db.relationship('Feedback', backref='user', lazy=True)
    
    def set_password(self, password):
        """Hash và lưu password"""
        self.password_hash = bcrypt.hashpw(password.encode('utf-8'), bcrypt.gensalt()).decode('utf-8')
    
    def check_password(self, password):
        """Kiểm tra password"""
        return bcrypt.checkpw(password.encode('utf-8'), self.password_hash.encode('utf-8'))
    
    def __repr__(self):
        return f'<User {self.username}>'

class Feedback(db.Model):
    __tablename__ = 'feedbacks'
    
    id = db.Column(db.Integer, primary_key=True)
    text = db.Column(db.Text, nullable=False)
    sentiment = db.Column(db.String(20), nullable=False)
    topic = db.Column(db.String(50), nullable=False)
    sentiment_confidence = db.Column(db.Float, nullable=False)
    topic_confidence = db.Column(db.Float, nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    
    def __repr__(self):
        return f'<Feedback {self.id}: {self.sentiment} - {self.topic}>'