"""
Database configuration and session management
"""
from sqlalchemy import create_engine
from sqlalchemy.orm import declarative_base, sessionmaker, Session
from typing import Generator

from app.config import settings

engine = create_engine(
    settings.database_url,
    connect_args={
        "check_same_thread": False,
        # SQLite performance optimizations for bulk imports
        "timeout": 30,
    } if "sqlite" in settings.database_url else {},
    # Performance settings for bulk operations
    pool_pre_ping=True,
    pool_recycle=3600,  # Recycle connections after 1 hour
    echo=False  # Set to True for SQL debugging
)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()


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