from __future__ import annotations

from fastapi import Request
from fastapi.responses import JSONResponse, RedirectResponse, Response


def wants_json(request: Request) -> bool:
    path = request.url.path or ""
    accept = (request.headers.get("accept") or "").lower()
    requested_with = (request.headers.get("x-requested-with") or "").lower()
    return path.startswith("/api") or "application/json" in accept or requested_with == "xmlhttprequest"


def ui_access_denied(message: str = "Access denied") -> Response:
    return Response(
        content=f"403 Forbidden: {message}",
        status_code=403,
        media_type="text/plain; charset=utf-8",
    )


def ui_not_found(message: str = "Not found") -> Response:
    return Response(
        content=f"404 Not Found: {message}",
        status_code=404,
        media_type="text/plain; charset=utf-8",
    )


def auth_required_response(request: Request):
    if wants_json(request):
        return JSONResponse({"detail": "Not authenticated"}, status_code=401)
    return RedirectResponse(url="/login", status_code=303)


def forbidden_response(request: Request, message: str = "Access denied"):
    if wants_json(request):
        return JSONResponse({"detail": message}, status_code=403)
    return ui_access_denied(message)


def not_found_response(request: Request, message: str = "Not found"):
    if wants_json(request):
        return JSONResponse({"detail": message}, status_code=404)
    return ui_not_found(message)