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

import createMockRes from "test-utils/create-mock-res";

function sha256(input) {
  return createHash("sha256").update(input).digest("hex");
}

const { readFileSync, checkAndCopyConfig, CONF_DIR } = vi.hoisted(() => ({
  readFileSync: vi.fn(),
  checkAndCopyConfig: vi.fn(),
  CONF_DIR: "/conf",
}));

vi.mock("fs", () => ({
  readFileSync,
}));

vi.mock("utils/config/config", () => ({
  default: checkAndCopyConfig,
  CONF_DIR,
}));

import handler from "pages/api/hash";

describe("pages/api/hash", () => {
  const originalBuildTime = process.env.HOMEPAGE_BUILDTIME;

  beforeEach(() => {
    vi.clearAllMocks();
    process.env.HOMEPAGE_BUILDTIME = originalBuildTime;
  });

  it("returns a combined sha256 hash of known config files and build time", async () => {
    process.env.HOMEPAGE_BUILDTIME = "build-1";

    // Return deterministic contents based on file name.
    readFileSync.mockImplementation((filePath) => {
      const name = filePath.split("/").pop();
      return `content:${name}`;
    });

    const req = { query: {} };
    const res = createMockRes();

    await handler(req, res);

    const configs = [
      "docker.yaml",
      "settings.yaml",
      "services.yaml",
      "bookmarks.yaml",
      "widgets.yaml",
      "custom.css",
      "custom.js",
    ];
    const hashes = configs.map((c) => sha256(`content:${c}`));
    const expected = sha256(hashes.join("") + "build-1");

    expect(checkAndCopyConfig).toHaveBeenCalled();
    expect(res.body).toEqual({ hash: expected });
  });
});