from __future__ import annotations

import os
from collections.abc import Generator
from contextlib import contextmanager

from sqlalchemy import create_engine
from sqlalchemy.orm import Session, sessionmaker


DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./runtime/platform.db")

engine = create_engine(
    DATABASE_URL,
    pool_pre_ping=True,
    future=True,
    connect_args={"check_same_thread": False} if DATABASE_URL.startswith("sqlite") else {},
)
SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False, expire_on_commit=False, future=True)


def get_db() -> Generator[Session, None, None]:
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


@contextmanager
def session_scope() -> Generator[Session, None, None]:
    db = SessionLocal()
    try:
        yield db
        db.commit()
    except Exception:
        db.rollback()
        raise
    finally:
        db.close()