from sqlalchemy import text
from sqlmodel import SQLModel, Session, create_engine

from app.config import settings

engine = create_engine(settings.DATABASE_URL)


def init_db():
    SQLModel.metadata.create_all(engine)


def run_migrations():
    """Run idempotent schema migrations for columns added after initial create."""
    with engine.connect() as conn:
        try:
            conn.execute(
                text(
                    "ALTER TABLE transaction ADD COLUMN IF NOT EXISTS deferred_to_next_cycle BOOLEAN NOT NULL DEFAULT false"
                )
            )
            conn.commit()
        except Exception:
            conn.rollback()


def get_session():
    with Session(engine) as session:
        yield session