from pathlib import Path

from flask import Flask
from sqlalchemy import create_engine
from sqlalchemy.orm import DeclarativeBase, Session, scoped_session, sessionmaker

engine = None
SessionLocal: scoped_session[Session]


class Base(DeclarativeBase):
    pass


def init_db(app: Flask) -> None:  # noqa: ARG001
    global engine, SessionLocal  # noqa: PLW0603

    Path("./instance").mkdir(exist_ok=True)

    engine = create_engine("sqlite:///instance/app.db", echo=True, future=True)
    session_local = scoped_session(sessionmaker(bind=engine))
    if session_local is None:
        raise RuntimeError
    SessionLocal = session_local

    from . import models  # noqa: F401, PLC0415

    Base.metadata.create_all(bind=engine)