import { readFile } from "node:fs/promises";

import { describe, expect, it, vi } from "vitest";

vi.hoisted(() => {
  vi.stubEnv("BASE_URL", "https://guide.example.test");
});

import robots from "@/app/robots";

async function repositoryFile(path: string): Promise<string> {
  return readFile(new URL(`../${path}`, import.meta.url), "utf8");
}

describe("public rendering performance", () => {
  it("keeps the directory eligible for a populated static shell", async () => {
    const [layout, page] = await Promise.all([
      repositoryFile("app/layout.tsx"),
      repositoryFile("app/page.tsx"),
    ]);

    expect(layout).not.toContain("export const instant = false");
    expect(page).not.toContain("export const instant = false");
    expect(page).toContain("async function DirectoryContent()");
    expect(page).toContain("await connection()");
    expect(page).toContain('fallback={<div className="min-h-svh"');
  });

  it("isolates request-time header authentication", async () => {
    const header = await repositoryFile("components/public/site-header.tsx");

    expect(header).toContain("<Suspense fallback={null}>");
    expect(header).toContain("<AdminEditLink");
  });

  it("gives only the first directory cover high fetch priority", async () => {
    const directory = await repositoryFile(
      "components/public/structured-directory.tsx",
    );

    expect(directory).toContain(
      'fetchPriority={index === 0 ? "high" : undefined}',
    );
    expect(directory).not.toContain("preload={index === 0}");
    expect(directory).toContain("prefetch={false}");
  });

  it("publishes a public-only crawler policy", () => {
    expect(robots()).toEqual({
      rules: {
        userAgent: "*",
        allow: "/",
        disallow: ["/admin", "/api", "/register"],
      },
      sitemap: "https://guide.example.test/sitemap.xml",
    });
  });
});