"""User model."""
from datetime import datetime
from app import db

class User(db.Model):
    """User model representing a user in the system."""
    __tablename__ = 'users'
    
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False, index=True)
    email = db.Column(db.String(120), unique=True, nullable=False, index=True)
    first_name = db.Column(db.String(100), nullable=True)
    last_name = db.Column(db.String(100), nullable=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    is_active = db.Column(db.Boolean, default=True)
    
    def __repr__(self):
        return f'<User {self.username}>'
    
    def to_dict(self):
        """Convert user to dictionary."""
        return {
            'id': self.id,
            'username': self.username,
            'email': self.email,
            'first_name': self.first_name,
            'last_name': self.last_name,
            'created_at': self.created_at.isoformat() if self.created_at else None,
            'updated_at': self.updated_at.isoformat() if self.updated_at else None,
            'is_active': self.is_active
        }
    
    @property
    def full_name(self):
        """Get full name of the user."""
        if self.first_name and self.last_name:
            return f"{self.first_name} {self.last_name}"
        return self.username