"""uvicorn entry point: `uvicorn semif_serve.main:app_from_env --factory --workers 1`."""
from __future__ import annotations

import os

from fastapi import FastAPI

from .app import create_app
from .config import Settings


def app_from_env() -> FastAPI:
    settings = Settings.from_env(os.environ)
    # INV-5: never download at runtime, inside the image or out of it (bug hunt S10). Set before
    # torch / transformers / huggingface_hub are imported, since they read it at import time.
    os.environ["HF_HUB_OFFLINE"] = "1"
    os.environ["TRANSFORMERS_OFFLINE"] = "1"
    from .engine import TorchEngine   # torch loads only here, never in the unit tests

    return create_app(settings, TorchEngine.load(settings))