from __future__ import annotations

import httpx
from fastapi.responses import JSONResponse


def upstream_error(panel: str) -> JSONResponse:
    return JSONResponse(status_code=502, content={"error": "upstream_failure", "panel": panel})


def async_transport() -> httpx.AsyncBaseTransport | None:
    return None


def client(base_url: str, headers: dict[str, str] | None = None) -> httpx.AsyncClient:
    return httpx.AsyncClient(
        base_url=base_url.rstrip("/"),
        headers=headers or {},
        timeout=20.0,
        transport=async_transport(),
    )