import { describe, it, expect, beforeAll, afterAll } from "vitest";
import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";

import { GET as getBranches } from "./route.js";

let tmpRoot;

beforeAll(async () => {
	// Create a dedicated temporary root for this test suite
	tmpRoot = await fs.mkdtemp(path.join(os.tmpdir(), "api-branches-"));

	// Make this temp root the NAS root for the duration of these tests
	process.env.NAS_ROOT_PATH = tmpRoot;

	// Create a branch and a snapshot folder
	await fs.mkdir(path.join(tmpRoot, "NL01"), { recursive: true });
	await fs.mkdir(path.join(tmpRoot, "@Recently-Snapshot"));
});

afterAll(async () => {
	await fs.rm(tmpRoot, { recursive: true, force: true });
});

describe("GET /api/branches", () => {
	it("returns branch names and filters snapshot folders", async () => {
		const req = new Request("http://localhost/api/branches");
		const res = await getBranches(req);
		expect(res.status).toBe(200);

		const body = await res.json();
		expect(body).toEqual({ branches: ["NL01"] });
	});

	it("returns 500 when NAS_ROOT_PATH is invalid", async () => {
		const originalRoot = process.env.NAS_ROOT_PATH;
		process.env.NAS_ROOT_PATH = path.join(tmpRoot, "does-not-exist");

		const req = new Request("http://localhost/api/branches");
		const res = await getBranches(req);
		expect(res.status).toBe(500);

		const body = await res.json();
		expect(body.error).toContain("Fehler beim Lesen der Niederlassungen");

		// Restore valid root for subsequent tests
		process.env.NAS_ROOT_PATH = originalRoot;
	});
});