import { test, expect } from "@playwright/test";
import { resetData, generateReport } from "./helpers";

// A TRIPWIRE, not a benchmark.
//
// These budgets are enormous relative to what the pages cost against the test
// corpus (tens of milliseconds) and they run on a shared machine alongside
// other work, so they will not catch a 2× slowdown. What they catch is the
// specific failure this whole change set was about: a render path quietly
// acquiring a full corpus walk again. That turns tens of milliseconds into
// seconds, and it is the kind of regression that is invisible in review and
// obvious here.
//
// If one of these fails, the question to ask is "what did this page start
// reading?" — not "is the machine busy?".
const BUDGET_MS = 3_000;

test.describe("perf budget", () => {
  test.beforeEach(async () => {
    await resetData("channel-with-counts");
  });

  test("the dashboard renders within budget", async ({ page }) => {
    const started = Date.now();
    await page.goto("/");
    await expect(
      page.getByRole("heading", { name: "Dashboard", level: 1 }),
    ).toBeVisible();
    const elapsed = Date.now() - started;
    expect(elapsed, `dashboard took ${elapsed}ms`).toBeLessThan(BUDGET_MS);
  });

  test("the channels page renders within budget", async ({ page }) => {
    const started = Date.now();
    await page.goto("/channels");
    await expect(
      page.getByRole("heading", { name: "Channels", level: 1 }),
    ).toBeVisible();
    const elapsed = Date.now() - started;
    expect(elapsed, `channels took ${elapsed}ms`).toBeLessThan(BUDGET_MS);
  });

  test("the sidebar's reclaimable-disk badge is not a corpus walk", async ({
    page,
    request,
  }) => {
    // This endpoint is the one that used to cost 4.4 s to describe ~98 videos,
    // on every widget poll. It reads the per-channel snapshots now.
    await generateReport(page, "counted");
    const started = Date.now();
    const res = await request.get("/api/widget/cleanable");
    const elapsed = Date.now() - started;
    expect(res.ok()).toBe(true);
    expect(elapsed, `/api/widget/cleanable took ${elapsed}ms`).toBeLessThan(
      BUDGET_MS,
    );
  });
});