/**
 * The List tab: a list property is a button saying how many items it has, clicking it opens the
 * tab, and there a row per item edits, adds and removes them with the inspector's own widgets.
 */
export async function listTab(t) {
  const { check, sleep, json, shot, click, clickText, press, typeText, mutate, undo } = t;

  /** `locate` throws when the text is absent, which is the wrong shape for "is it there?". */
  const find = (text) => json(`__gm.locate(${JSON.stringify(text)}, false)`);

  // A throwaway behavior carrying one list variable; removed again at the end of the step. Its
  // items are two digits so that no value can be confused with a row's index label.
  await mutate(`
    const p = __gm.state.project;
    p.assets.push({
      id: 'listy',
      type: 'behavior',
      name: 'Listy',
      props: { enabled: true, runInEditor: false, nums: [30, 11, 44] },
      variables: [{ key: 'nums', label: 'nums', kind: 'list', default: [], items: 'number' }],
      graph: { nodes: [], edges: [] },
    });
    __gm.state.select({ kind: 'asset', assetId: 'listy' });
  `);
  await sleep(150);

  // 1. The inspector shows the count, not a comma-separated line.
  const button = await find('3 items');
  check('a list property reads as its item count', button !== null, JSON.stringify(button));
  check('the editor is still on the scene tab', (await json('__gm.tab()')) === 'scene');
  await shot('01-count-button');

  // 2. Clicking it opens the List tab on that very list.
  await click(button.x, button.y);
  await sleep(200);
  check('clicking it switches to the List tab', (await json('__gm.tab()')) === 'list');
  let info = await json('__gm.list.info()');
  check('which shows the list it was opened from', info.title === 'Listy · nums', JSON.stringify(info));
  check('with a row per item', JSON.stringify(info.items) === '["30","11","44"]', JSON.stringify(info.items));
  check('and the inspector is still beside it', (await find('VARIABLES')) !== null);
  await shot('02-list-tab');

  // 3. A row edits its item, and it is one undo step.
  const second = await json('__gm.list.fieldAt(1)');
  await click(second.x, second.y);
  await typeText('42');
  await press('Enter');
  await sleep(200);
  info = await json('__gm.list.info()');
  check('typing in a row writes that item', JSON.stringify(info.items) === '["30","42","44"]', info.items[1]);
  await undo();
  info = await json('__gm.list.info()');
  check('undo takes just that item back', JSON.stringify(info.items) === '["30","11","44"]', info.items[1]);

  // 4. A short list opened after a long one. Its rows leave the content height pinned to the
  // viewport, so a layout skipped on "same size" would stack them all at the top.
  await mutate(`
    const a = __gm.state.project.assets.find((x) => x.id === 'listy');
    a.props.nums = Array.from({ length: 60 }, (_, i) => i);
    __gm.state.preview();
  `);
  await sleep(250);
  const longRows = [await json('__gm.list.fieldAt(0)'), await json('__gm.list.fieldAt(1)')];
  check('a long list stacks its rows', longRows[0].y !== longRows[1].y, JSON.stringify(longRows));
  await mutate(`
    const a = __gm.state.project.assets.find((x) => x.id === 'listy');
    a.props.nums = [30, 11, 44];
    __gm.state.preview();
  `);
  await sleep(250);
  const shortRows = [await json('__gm.list.fieldAt(0)'), await json('__gm.list.fieldAt(1)')];
  check(
    'and a short list after it still stacks its own',
    shortRows[0].y !== shortRows[1].y,
    JSON.stringify(shortRows),
  );

  // 5. Adding and removing whole items.
  await clickText('+ Item');
  await sleep(200);
  info = await json('__gm.list.info()');
  check('+ Item appends one', info.items.length === 4, JSON.stringify(info.items));
  await undo();
  check('undo removes it again', (await json('__gm.list.info()')).items.length === 3);
  await shot('03-rows');

  // 6. Back on the scene tab the button carries the current count.
  await mutate('__gm.state.openList(null)');
  await sleep(200);
  check('closing the list leaves the tab', (await json('__gm.tab()')) === 'scene');
  await mutate(`
    __gm.state.project.assets.find((a) => a.id === 'listy').props.nums = [1, 2];
    __gm.state.preview();
  `);
  await sleep(200);
  check('and the count follows the value', (await find('2 items')) !== null);

  // 7. A list whose target is gone empties the tab rather than showing a stale one.
  await mutate("__gm.state.openList({ kind: 'asset', assetId: 'listy', key: 'nums' })");
  await sleep(200);
  check('a list can be opened from outside the inspector too', (await json('__gm.tab()')) === 'list');
  await mutate(`
    const p = __gm.state.project;
    p.assets = p.assets.filter((a) => a.id !== 'listy');
    __gm.state.select(null);
    __gm.state.preview();
  `);
  await sleep(200);
  info = await json('__gm.list.info()');
  check('a deleted target empties the tab', info.title === '' && info.items.length === 0, info.title);
  await shot('04-empty');

  await mutate('__gm.state.openList(null)');
  await sleep(200);
  const left = await json('__gm.state.project.assets.filter((a) => a.id === "listy").length');
  check('the step leaves the fixture as it found it', left === 0, String(left));
}