from app import db, login_manager
from flask_login import UserMixin
from werkzeug.security import generate_password_hash, check_password_hash
from datetime import datetime

class User(UserMixin, db.Model):
    __tablename__ = 'users'
    
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(255), unique=True, nullable=False, index=True)
    password_hash = db.Column(db.String(255), nullable=False)
    name = db.Column(db.String(100), nullable=False)
    role = db.Column(db.String(50), nullable=False)
    is_active = db.Column(db.Boolean, default=True, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    last_login = db.Column(db.DateTime)
    preferred_language = db.Column(db.String(10), default=None, nullable=True)
    
    # Virtual fields for future compatibility
    @property
    def first_name(self):
        return self.name.split()[0] if self.name else ''
    
    @property
    def last_name(self):
        parts = self.name.split()
        return ' '.join(parts[1:]) if len(parts) > 1 else ''
    
    # Relationships
    reservations = db.relationship('Reservation', backref='user', lazy=True, cascade='all, delete-orphan')
    
    def set_password(self, password):
        """Set password hash"""
        self.password_hash = generate_password_hash(password, method='pbkdf2:sha256')
    
    def check_password(self, password):
        """Check password"""
        return check_password_hash(self.password_hash, password)
    
    def is_admin(self):
        """Check if user is admin"""
        return self.role == 'ADMIN'
    
    def update_last_login(self):
        """Update last login timestamp"""
        self.last_login = datetime.utcnow()
        db.session.commit()
    
    def to_dict(self):
        """Convert user to dictionary"""
        return {
            'id': self.id,
            'email': self.email,
            'name': self.name,
            'role': self.role,
            'is_active': self.is_active,
            'created_at': self.created_at.isoformat() if self.created_at else None,
            'last_login': self.last_login.isoformat() if self.last_login else None
        }
    
def __repr__(self):
        return f'<User {self.email}>'

@login_manager.user_loader
def load_user(user_id):
    """Load user from database by ID"""
    return User.query.get(int(user_id))