import { describe, expect, it, vi } from "vitest";
import { ResourceCache } from "./resource-cache";

describe("login-owned resource cache", () => {
  it("shares in-flight work, retains fresh values and retries after expiry", async () => {
    const clock = vi.spyOn(Date, "now").mockReturnValue(100);
    const cache = new ResourceCache();
    const fetch = vi.fn(async () => ["project-a"]);
    const first = cache.load("projects", fetch, 60_000);
    expect(cache.load("projects", fetch, 60_000)).toBe(first);
    await first;
    for (let i = 0; i < 10; i++) await cache.load("projects", fetch, 60_000);
    expect(fetch).toHaveBeenCalledTimes(1);
    clock.mockReturnValue(60_101);
    await cache.load("projects", fetch, 60_000);
    expect(fetch).toHaveBeenCalledTimes(2);
    clock.mockRestore();
  });
  it("retains the last content after refresh failure and briefly caches failures", async () => {
    const cache = new ResourceCache();
    cache.set("suggestions", ["原有问题"], 0);
    const fail = vi.fn(async () => { throw new Error("offline"); });
    await expect(cache.load("suggestions", fail, 60_000, { errorTtl: 30_000 })).rejects.toThrow("offline");
    await expect(cache.load("suggestions", fail, 60_000)).rejects.toThrow("offline");
    expect(cache.peek<string[]>("suggestions")?.value).toEqual(["原有问题"]);
    expect(fail).toHaveBeenCalledTimes(1);
    cache.clear();
    expect(cache.peek("suggestions")).toBeUndefined();
  });
});