/**
 * While playing (#265): how closely the panels follow a running game. The preset is picked in the
 * Project settings with the mouse; Live brings the panels up to date every frame, Balanced four
 * times a second, and neither holds the game back. On Balanced the scene view stops drawing behind
 * the game tab and catches up when it comes back; on Minimal the hierarchy waits for a pause. A
 * crate spawned at the top level is listed in a group named "Crate".
 */
export async function whilePlaying(t) {
  const {
    check,
    json,
    evaluate,
    click,
    clickText,
    clickToolbar,
    press,
    play,
    stop,
    shot,
    showTab,
    undo,
    sleep,
  } = t;
  const playInfo = () => json('__gm.playInfo()');
  /** Panel updates so far and the page's clock, so a rate is measured in the page, not over CDP. */
  const sample = () => json('({ at: performance.now(), ...__gm.playInfo().panelUpdates })');
  const valuesPerSecond = async (ms) => {
    const a = await sample();
    await sleep(ms);
    const b = await sample();
    return { rate: ((b.values - a.values) * 1000) / (b.at - a.at), a, b };
  };
  const setWhilePlaying = async (label) => {
    await clickToolbar('menu');
    await clickText('Project settings…');
    const before = (await json('__gm.projectSettings()')).whilePlaying;
    const at = await json('__gm.projectSettingsWhilePlayingAt()');
    await click(at.x, at.y);
    await clickText(label);
    const chosen = (await json('__gm.projectSettings()')).whilePlaying;
    await clickText('Apply');
    return { before, chosen };
  };
  const undoSteps = () => json('__gm.state.commands.undoStack.length');
  /** Whether the hierarchy *shows* the row – `hierarchyOrder` reads the model, not the list on screen. */
  const listed = (rowId) => json(`__gm.hierarchyRow(${JSON.stringify(rowId)}) !== null`);
  const crateGroups = () => json(`(__gm.state.activeScene.groups ?? []).filter((g) => g.name === 'Crate')`);

  await press('Escape');
  await evaluate('__gm.state.select(null)');
  await showTab('scene');

  // 59a. The fixture was written without the setting, so it reads as Balanced; Live is picked with
  //      the mouse and is one undo step.
  check(
    'a project written before there was a choice plays Balanced',
    (await json('__gm.state.project.whilePlaying')) === 'balanced',
  );
  const steps = await undoSteps();
  const picked = await setWhilePlaying('Live');
  check(
    'the Project settings show Balanced and take Live from the menu',
    picked.before === 'balanced' &&
      picked.chosen === 'live' &&
      (await json('__gm.state.project.whilePlaying')) === 'live' &&
      (await undoSteps()) === steps + 1,
    JSON.stringify({ picked, steps: await undoSteps(), before: steps }),
  );

  // 59b. Live follows every frame; Balanced four times a second.
  await play();
  const live = await valuesPerSecond(1500);
  await stop();
  await undo();
  check('undo sets it back to Balanced', (await json('__gm.state.project.whilePlaying')) === 'balanced');
  await play();
  const balanced = await valuesPerSecond(1500);
  check(
    'Live brings the panels up to date every frame, Balanced at most four times a second',
    live.rate > 20 && balanced.rate > 2 && balanced.rate <= 4.5,
    JSON.stringify({ live: live.rate, balanced: balanced.rate }),
  );

  // 59c. Behind the game tab the scene view does not draw on Balanced – three crates spawned, not
  //      one redraw – and catches up when its tab comes back. The crates are in a group "Crate".
  const hidden = (await json('__gm.viewportInfo()')).redraws;
  const entitiesBefore = (await json('__gm.world()')).entities.length;
  for (let i = 0; i < 3; i++) await press('Space');
  await sleep(600);
  const stillHidden = (await json('__gm.viewportInfo()')).redraws;
  const groups = await crateGroups();
  const members = await json(
    `__gm.state.activeScene.objects.filter((o) => o.groupId === ${JSON.stringify(groups[0]?.id ?? '')}).length`,
  );
  check(
    'the game ran on – three crates spawned – and they are listed in one group named Crate',
    (await json('__gm.world()')).entities.length === entitiesBefore + 3 &&
      groups.length === 1 &&
      members === 3,
    JSON.stringify({ entitiesBefore, groups, members }),
  );
  check('the hierarchy shows the group after the next update', await listed(`group:${groups[0]?.id}`));
  check(
    'behind the game tab the scene view did not draw once',
    stillHidden === hidden,
    JSON.stringify({ hidden, stillHidden }),
  );
  await showTab('scene');
  const shown = (await json('__gm.viewportInfo()')).redraws;
  check(
    'and it draws again when its tab comes back',
    shown > stillHidden,
    JSON.stringify({ stillHidden, shown }),
  );
  await shot('59a-balanced-group');
  await stop();

  // 59d. Minimal: the hierarchy waits while the game runs, and a pause brings it up to date at once.
  await showTab('scene');
  await setWhilePlaying('Minimal');
  await play();
  await press('Space');
  await sleep(600);
  const spawnedGroups = await crateGroups();
  const groupRow = `group:${spawnedGroups[0]?.id}`;
  const listedRunning = await listed(groupRow);
  check(
    'on Minimal a spawn reaches the scene, but the hierarchy waits',
    spawnedGroups.length === 1 && !listedRunning,
    JSON.stringify({ spawnedGroups, listedRunning }),
  );
  await clickToolbar('pause');
  check('and a pause lists it at once', (await playInfo()).paused && (await listed(groupRow)));
  await shot('59b-minimal-paused');
  await stop();

  await undo();
  check(
    'the fixture is left on Balanced with the undo stack as found',
    (await json('__gm.state.project.whilePlaying')) === 'balanced' && (await undoSteps()) === steps,
    JSON.stringify({ steps: await undoSteps(), before: steps }),
  );
}