import { existsSync } from "node:fs";
import { join } from "node:path";

export const runtime = "nodejs";
export const dynamic = "force-dynamic";

export function GET(): Response {
	const hostKind = process.env.SF_WEB_HOST_KIND ?? "unknown";
	const packageRoot = process.env.SF_WEB_PACKAGE_ROOT ?? "";
	const isSourceDev = hostKind === "source-dev";

	// When running via `npm run sf:web` from the monorepo, the host resolves
	// as packaged-standalone (because the build exists), but the source web/
	// directory is still present at the package root. A truly published package
	// won't have web/app/ next to dist/.
	const isMonorepoDev =
		!isSourceDev &&
		packageRoot.length > 0 &&
		existsSync(join(packageRoot, "web", "app"));

	return Response.json(
		{ isDevMode: isSourceDev || isMonorepoDev },
		{ headers: { "Cache-Control": "no-store" } },
	);
}