"""
Database initialization and migration
"""
from sqlalchemy import event
from .database import Base, engine, SessionLocal
from .models.user import User, UserRole, UserStatus
import logging

logger = logging.getLogger(__name__)

def init_db():
    """Initialize database and create default admin user"""
    try:
        # Create all tables
        Base.metadata.create_all(bind=engine)
        
        # Create a session
        db = SessionLocal()
        
        # Check if admin user exists
        admin = db.query(User).filter(User.role == UserRole.ADMIN).first()
        if not admin:
            # Create default admin user with password 'admin'
            # Note: This should be changed immediately after first login
            admin = User(
                username="admin",
                password_hash=User.hash_password("admin"),
                role=UserRole.ADMIN,
                status=UserStatus.ACTIVE
            )
            db.add(admin)
            db.commit()
            logger.info("Created default admin user")
        
        db.close()
        logger.info("Database initialized successfully")
        return True
        
    except Exception as e:
        logger.error(f"Error initializing database: {e}")
        return False

@event.listens_for(User, 'after_insert')
def user_created(mapper, connection, target):
    """Log user creation"""
    logger.info(f"New user created: {target.username}")

@event.listens_for(User.status, 'set')
def user_status_changed(target, value, oldvalue, initiator):
    """Log user status changes"""
    if oldvalue and value != oldvalue:
        logger.info(f"User {target.username} status changed from {oldvalue} to {value}")