import { readFileSync } from "node:fs";
import path from "node:path";
import { describe, expect, it } from "vitest";

const viteConfig = readFileSync(path.resolve(__dirname, "../../../../client/vite.config.ts"), "utf8");

function runtimeCacheRule(cacheName) {
  const marker = `cacheName: "${cacheName}"`;
  const at = viteConfig.indexOf(marker);
  expect(at, `${cacheName} rule must exist`).toBeGreaterThan(-1);
  const start = viteConfig.lastIndexOf("urlPattern:", at);
  const end = viteConfig.indexOf("urlPattern:", at);
  return viteConfig.slice(start, end === -1 ? undefined : end);
}

describe("client PWA API runtime cache", () => {
  it("falls back to cached API data only when the network fails, never on a slow response", () => {
    const rule = runtimeCacheRule("app-api-runtime");
    expect(rule).toContain('handler: "NetworkFirst"');
    // A timeout made the service worker answer a post-approval refetch with the
    // cached pre-approval task after 3s, so the page kept showing "待派发".
    expect(rule).not.toMatch(/networkTimeoutSeconds/);
  });
});