from __future__ import annotations

from pathlib import Path

from fastapi import APIRouter
from fastapi import HTTPException
from fastapi.responses import FileResponse


router = APIRouter()
WEB_DIR = Path(__file__).resolve().parent
DIST_DIR = WEB_DIR / "dist"
INDEX_FILE = DIST_DIR / "index.html"


def _get_index_file() -> Path:
    if not INDEX_FILE.exists():
        raise HTTPException(status_code=503, detail="Web UI assets are not built.")
    return INDEX_FILE


@router.get("/app", include_in_schema=False)
@router.get("/app/{path:path}", include_in_schema=False)
async def web_app(_path: str = "") -> FileResponse:
    return FileResponse(_get_index_file())