"""
Database connection and initialization
"""
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, Session
from typing import Generator
import logging

from app.config import get_settings
from app.models.data_models import Base

logger = logging.getLogger(__name__)

settings = get_settings()

# Create database engine
engine = create_engine(
    settings.database_url,
    echo=settings.debug,
    pool_pre_ping=True,
    pool_size=10,
    max_overflow=20
)

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


def get_db() -> Generator[Session, None, None]:
    """
    Get database session

    Yields:
        Database session
    """
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def init_db() -> None:
    """
    Initialize database - create all tables
    """
    try:
        logger.info("Creating database tables...")
        Base.metadata.create_all(bind=engine)
        logger.info("Database tables created successfully!")
    except Exception as e:
        logger.error(f"Error creating database tables: {e}")
        raise


def drop_db() -> None:
    """
    Drop all database tables (use with caution!)
    """
    logger.warning("Dropping all database tables...")
    Base.metadata.drop_all(bind=engine)
    logger.info("Database tables dropped!")


if __name__ == "__main__":
    # Initialize database when run directly
    logging.basicConfig(level=logging.INFO)
    init_db()