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

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from app.config import get_settings

settings = get_settings()

# Create engine with SQLite optimizations
engine = create_engine(
    settings.database_url,
    connect_args={"check_same_thread": False},  # SQLite specific
    echo=settings.debug,
)

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

# Base class for models
Base = declarative_base()


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


def init_db():
    """Initialize database tables."""
    # Import models to register them with Base
    from app.models import User, Task  # noqa: F401
    Base.metadata.create_all(bind=engine)