"""Database configuration and session management."""

import os
from sqlalchemy import create_engine
from sqlalchemy.orm import declarative_base, sessionmaker

# Use SQLite database
DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./data/app.db")

# Create data directory if it doesn't exist
if DATABASE_URL.startswith("sqlite"):
    os.makedirs("./data", exist_ok=True)

engine = create_engine(
    DATABASE_URL,
    connect_args={"check_same_thread": False} if DATABASE_URL.startswith("sqlite") else {}
)

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

Base = declarative_base()


def get_db():
    """Dependency to get database session."""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()