import assert from "node:assert/strict";

// Regression coverage for splitting the Guide page into tabs (previously ~20 stacked
// panels on one very long page - "Getting started", "Create a race", "Run a race",
// "Training & results", "Video guides"). Tabs must show exactly one group of panels at a
// time, default to "Getting started" on first load, and - the actual bug class this
// guards against - keep the selection when the page re-renders in place (a language
// switch calls renderView() without navigating away), not silently reset. activeGuideTab
// is a module-level variable specifically so it survives that re-render.
export async function runGuideTabsSmoke({ evaluate, navigate }) {
  await navigate("guide", "guideOverview");

  const activeTab = () => evaluate(`document.querySelector(".guide-tab.active")?.dataset.guideTab`);
  const panelVisibility = () => evaluate(`
    Object.fromEntries(Array.from(document.querySelectorAll("[data-guide-panel]"))
      .map((panel) => [panel.dataset.guidePanel, !panel.hidden]))
  `);

  assert.equal(await activeTab(), "start", "Getting started is the default tab on first load");
  let visible = await panelVisibility();
  assert.equal(visible.start, true, "start panel visible by default");
  assert.equal(visible.create, false, "create panel hidden by default");
  assert.equal(visible.run, false, "run panel hidden by default");
  assert.equal(visible.training, false, "training panel hidden by default");
  assert.equal(visible.videos, false, "videos panel hidden by default");
  console.log("PASS guide defaults to the Getting started tab with only that panel visible");

  for (const tab of ["create", "run", "training", "videos", "start"]) {
    await evaluate(`document.querySelector('[data-guide-tab="${tab}"]').click()`);
    assert.equal(await activeTab(), tab, `clicking the ${tab} tab activates it`);
    visible = await panelVisibility();
    for (const [panelId, isVisible] of Object.entries(visible)) {
      assert.equal(isVisible, panelId === tab, `after switching to ${tab}, panel ${panelId} should be ${panelId === tab ? "visible" : "hidden"}`);
    }
  }
  console.log("PASS clicking each guide tab shows only its own panel and hides the rest");

  const videoLinkCount = await evaluate(`document.querySelectorAll('[data-guide-panel="videos"] a[href^="/docs/videos/"]').length`);
  assert.equal(videoLinkCount, 7, "all 7 video guide links live under the Video guides tab");

  await evaluate(`document.querySelector('[data-guide-tab="run"]').click()`);
  assert.equal(await activeTab(), "run");
  // Switching language calls renderView() in place (no navigation) - exactly the path
  // that would silently reset the tab if activeGuideTab weren't module-scoped state.
  await evaluate(`(() => { const select = document.getElementById("languageSelect"); select.value = select.value === "en" ? "sv" : "en"; select.onchange(); })()`);
  assert.equal(await activeTab(), "run", "the selected tab survives a language-switch re-render, instead of resetting to Getting started");
  visible = await panelVisibility();
  assert.equal(visible.run, true);
  assert.equal(visible.start, false);
  console.log("PASS the active guide tab is preserved across a language-switch re-render");
}