import { headers } from "next/headers";

/**
 * Resolve the current site domain from request headers.
 * Used by the theme resolver to apply site-scoped themes.
 */
export async function resolveSiteDomain(): Promise<string | null> {
	const h = await headers();
	// Next.js sets host in the Host header
	const host = h.get("host") ?? h.get("x-forwarded-host");
	if (!host) return null;
	// Strip port if present
	return host.split(":")[0];
}

/**
 * Build the full theme context from the current request.
 * Combines site domain + route path + module detection.
 */
export async function buildThemeContext(pathname: string): Promise<{
	siteDomain: string | null;
	routePath: string;
	moduleId: string | null;
}> {
	const siteDomain = await resolveSiteDomain();
	const { detectModule } = await import("@/lib/theme-modules");
	const moduleId = detectModule(pathname);

	return {
		siteDomain,
		routePath: pathname,
		moduleId,
	};
}