"""Admin model for Work Statistics System."""
from datetime import datetime, timezone
from app import db


class Admin(db.Model):
    """Admin model representing an administrator in the system.
    
    Attributes:
        id: Primary key, auto-incremented
        username: Admin's username (required, unique, non-empty)
        password_hash: Bcrypt hashed password (required)
        created_at: Timestamp when the record was created
        updated_at: Timestamp when the record was last updated
    """
    __tablename__ = 'admins'
    
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    username = db.Column(db.String(100), nullable=False, unique=True, index=True)
    password_hash = db.Column(db.String(255), nullable=False)
    created_at = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc))
    updated_at = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
    
    def to_dict(self, include_password_hash=False):
        """Convert model to dictionary for JSON serialization.
        
        Args:
            include_password_hash: Whether to include password_hash in output (default False)
        
        Returns:
            Dictionary representation of the admin
        """
        result = {
            'id': self.id,
            'username': self.username,
            'created_at': self.created_at.isoformat() if self.created_at else None,
            'updated_at': self.updated_at.isoformat() if self.updated_at else None
        }
        if include_password_hash:
            result['password_hash'] = self.password_hash
        return result
    
    def __repr__(self):
        return f'<Admin {self.id}: {self.username}>'