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

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from contextlib import contextmanager

from webapp.app.config import settings

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

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

# Base class for models
Base = declarative_base()


def init_db():
    """Initialize database tables."""
    from webapp.app.models.job import Job  # noqa: F401
    from webapp.app.models.user import User  # noqa: F401

    Base.metadata.create_all(bind=engine)


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


@contextmanager
def get_db_session():
    """Context manager for database session."""
    db = SessionLocal()
    try:
        yield db
        db.commit()
    except Exception:
        db.rollback()
        raise
    finally:
        db.close()