import { NextResponse } from "next/server";
import { listYears } from "@/lib/storage";

/**
 * GET /api/branches/[branch]/years
 *
 * Returns the list of year folders for a given branch.
 * Example: /api/branches/NL01/years → { branch: "NL01", years: ["2023", "2024"] }
 */
export async function GET(request, ctx) {
	// Next.js 16: params are resolved asynchronously via ctx.params
	const { branch } = await ctx.params;
	console.log("[/api/branches/[branch]/years] params:", { branch });

	// Basic validation of required params
	if (!branch) {
		return NextResponse.json(
			{ error: "branch Parameter fehlt" },
			{ status: 400 }
		);
	}

	try {
		const years = await listYears(branch);

		return NextResponse.json({ branch, years });
	} catch (error) {
		console.error("[/api/branches/[branch]/years] Error:", error);

		return NextResponse.json(
			{ error: "Fehler beim Lesen der Jahre: " + error.message },
			{ status: 500 }
		);
	}
}