from __future__ import annotations

from collections.abc import Iterator

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

from app.config import REPO_ROOT, get_settings
from app.models import Base

_settings = get_settings()


def _normalize_url(url: str) -> tuple[str, dict]:
    connect_args: dict = {}
    if url.startswith("sqlite"):
        prefix, _, path = url.partition("sqlite:///")
        if path and not path.startswith("/"):
            url = f"{prefix}sqlite:///{REPO_ROOT / path}"
        connect_args = {"check_same_thread": False}
    return url, connect_args


_url, _connect_args = _normalize_url(_settings.database_url)
engine = create_engine(_url, connect_args=_connect_args, pool_pre_ping=True)
SessionLocal = sessionmaker(bind=engine, autoflush=False, expire_on_commit=False)


def init_db() -> None:
    Base.metadata.create_all(bind=engine)


def get_session() -> Iterator[Session]:
    session = SessionLocal()
    try:
        yield session
    finally:
        session.close()