"""
Database configuration and session management
"""
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, Session
from typing import Generator
from app.core.config import settings

# Create database engine
engine = create_engine(
    str(settings.DATABASE_URL),
    echo=settings.DEBUG,
    pool_pre_ping=True,
    pool_recycle=3600,
)

# Create session factory
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Create base class for models
Base = declarative_base()


def get_db() -> Generator[Session, None, None]:
    """
    Database dependency to get database session
    """
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def create_tables():
    """Create all database tables"""
    Base.metadata.create_all(bind=engine)


def drop_tables():
    """Drop all database tables"""
    Base.metadata.drop_all(bind=engine)