from sqlalchemy import create_engine, text
from sqlalchemy.orm import sessionmaker, DeclarativeBase
from app.config import settings

engine = create_engine(
    settings.DATABASE_URL,
    connect_args={"check_same_thread": False},
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


class Base(DeclarativeBase):
    pass


def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def apply_migrations():
    """Aplica migraciones incrementales compatibles con SQLite."""
    with engine.connect() as conn:
        for sql in [
            "ALTER TABLE playlists ADD COLUMN spotify_type VARCHAR NOT NULL DEFAULT 'playlist'",
            "ALTER TABLE playlists ADD COLUMN emoji VARCHAR NOT NULL DEFAULT ''",
        ]:
            try:
                conn.execute(text(sql))
                conn.commit()
            except Exception:
                pass  # columna ya existe