import { afterEach, describe, expect, it, vi } from "vitest";
import { fetchTutorialMetrics, shouldRefreshTutorialMetrics } from "./tutorialMetrics";

describe("shouldRefreshTutorialMetrics", () => {
  it("returns false without a supported source", () => {
    expect(shouldRefreshTutorialMetrics({ sourcePlatform: "site", platformVideoId: null })).toBe(false);
  });

  it("returns true when metrics are missing", () => {
    expect(shouldRefreshTutorialMetrics({
      sourcePlatform: "bilibili",
      platformVideoId: "BV1test",
      metricsFetchedAt: null,
    })).toBe(true);
  });

  it("returns false for fresh cached metrics", () => {
    expect(shouldRefreshTutorialMetrics({
      sourcePlatform: "bilibili",
      platformVideoId: "BV1test",
      metricsFetchedAt: new Date(),
      viewCount: 120,
      commentCount: 8,
    })).toBe(false);
  });
});

describe("fetchTutorialMetrics", () => {
  afterEach(() => {
    vi.restoreAllMocks();
  });

  it("parses bilibili metrics payloads", async () => {
    vi.stubGlobal("fetch", vi.fn().mockResolvedValue({
      ok: true,
      json: async () => ({
        data: {
          pic: "http://i0.hdslb.com/demo.jpg",
          stat: {
            view: 3210,
            reply: 42,
          },
        },
      }),
    }));

    const result = await fetchTutorialMetrics("bilibili", "BV1demo");
    expect(result).toMatchObject({
      viewCount: 3210,
      commentCount: 42,
      thumbnailUrl: "https://i0.hdslb.com/demo.jpg",
    });
  });
});