from __future__ import annotations

from collections.abc import Generator

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

from app.core.config import settings


if settings.database_dialect.strip().lower() == "sqlite":
    settings.sqlite_file.parent.mkdir(parents=True, exist_ok=True)

connect_args = (
    {"check_same_thread": False}
    if settings.database_dialect.strip().lower() == "sqlite"
    else {}
)

engine = create_engine(
    settings.database_url,
    echo=settings.database_echo,
    pool_pre_ping=True,
    connect_args=connect_args,
)

SessionLocal = sessionmaker(
    bind=engine,
    class_=Session,
    autoflush=False,
    autocommit=False,
    expire_on_commit=False,
)


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