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

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

# Ensure data directory exists
data_dir = Path("./data")
data_dir.mkdir(exist_ok=True)

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

# Create engine with SQLite-specific settings
engine = create_engine(
    DATABASE_URL,
    connect_args={"check_same_thread": False} if "sqlite" in DATABASE_URL else {},
    echo=False,
)

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


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


def init_db():
    """Initialize database tables."""
    Base.metadata.create_all(bind=engine)