/**
 * 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, find, shot, click, clickText, press, typeText, mutate, undo } = t;

  /** `locate` throws when the text is absent, which is the wrong shape for "is it there?". */

  // 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');

  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),
  );

  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);

  // 6b. What a list holds is a choice in the inspector, not only in a project file: the kind mark
  //     doubles as the picker, and changing it runs every value through the new declaration.
  const numsOf = () => json(`__gm.state.project.assets.find((a) => a.id === 'listy')`);
  await clickText('\u2261#');
  await sleep(150);
  await clickText('Texts');
  await sleep(250);
  let listy = await numsOf();
  check(
    'the kind mark picks what the list holds',
    listy.variables[0].items === 'text',
    listy.variables[0].items,
  );
  check('and the mark itself says what it holds now', (await find('≡Aa')) !== null);
  check(
    'and every value follows the declaration',
    JSON.stringify(listy.props.nums) === '["1","2"]',
    JSON.stringify(listy.props.nums),
  );
  await undo();
  await sleep(250);
  listy = await numsOf();
  check(
    'undo puts the kind and the values back',
    listy.variables[0].items === 'number' && JSON.stringify(listy.props.nums) === '[1,2]',
    JSON.stringify(listy.props.nums),
  );
  // The picker sits in the mark column, so it may not push the value off the inspector's grid.
  const lefts = await json(
    `[__gm.inspectorField('Name')?.left ?? null, __gm.inspectorField('nums')?.left ?? null]`,
  );
  check(
    'the picking mark keeps the list on the column every row shares',
    lefts[0] !== null && lefts[0] === lefts[1],
    JSON.stringify(lefts),
  );

  // 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');

  // 8. A list whose items are structs: each row is the bundle's fields under each other, built by
  //    the inspector's own struct renderer. Values are two digits so no row's index can match one.
  await mutate(`
    const p = __gm.state.project;
    p.assets.push({
      id: 'celly',
      type: 'behavior',
      name: 'Celly',
      props: { enabled: true, runInEditor: false, cells: [{ x: 30, y: 11 }, { x: 44, y: 55 }] },
      variables: [
        {
          key: 'cells',
          label: 'cells',
          kind: 'list',
          default: [],
          items: 'struct',
          fields: [{ key: 'x', kind: 'number' }, { key: 'y', kind: 'number' }],
        },
      ],
      graph: { nodes: [], edges: [] },
    });
    __gm.state.select({ kind: 'asset', assetId: 'celly' });
    __gm.state.openList({ kind: 'asset', assetId: 'celly', key: 'cells' });
  `);
  await sleep(250);
  info = await json('__gm.list.info()');
  check('a list of structs opens with a row per bundle', info.items.length === 2, JSON.stringify(info));
  check(
    'and a row reads as its fields, not as an object',
    info.items[0] === 'x: 30, y: 11',
    JSON.stringify(info.items),
  );
  check('the tab knows its items are structs', info.kind === 'struct', info.kind);
  check('the field labels of a bundle are on screen', (await find('x')) !== null);
  await shot('05-struct-rows');

  // Editing one field must leave the others and the neighbouring item alone – the whole item is
  // rewritten on every keystroke, so a snapshot anywhere would silently revive an old value.
  const firstField = await json("__gm.list.fieldAt(0, 'x')");
  await click(firstField.x, firstField.y);
  await typeText('77');
  await press('Enter');
  await sleep(250);
  const cells = await json(`__gm.state.project.assets.find((a) => a.id === 'celly').props.cells`);
  check(
    'editing one field of one item leaves every other value untouched',
    JSON.stringify(cells) ===
      JSON.stringify([
        { x: 77, y: 11 },
        { x: 44, y: 55 },
      ]),
    JSON.stringify(cells),
  );
  await undo();
  await sleep(200);
  const back = await json(`__gm.state.project.assets.find((a) => a.id === 'celly').props.cells`);
  check(
    'and undo takes back just that field',
    JSON.stringify(back) ===
      JSON.stringify([
        { x: 30, y: 11 },
        { x: 44, y: 55 },
      ]),
    JSON.stringify(back),
  );

  // 8b. The item shape is declared in the inspector as well, with the control a struct has – and
  //     primitives only, because a list inside a list item is the one shape the model does not store.
  const cellsOf = () => json(`__gm.state.project.assets.find((a) => a.id === 'celly').props.cells`);
  check('a list of structs carries the add-a-field control', (await find('+ Field')) !== null);
  await clickText('+ Field');
  await sleep(150);
  await clickText('Boolean');
  await sleep(250);
  check(
    '+ Field grows every item of the list at once',
    JSON.stringify(await cellsOf()) ===
      JSON.stringify([
        { x: 30, y: 11, field1: false },
        { x: 44, y: 55, field1: false },
      ]),
    JSON.stringify(await cellsOf()),
  );
  info = await json('__gm.list.info()');
  check(
    'and the tab shows the new field on every row',
    info.items[0] === 'x: 30, y: 11, field1: false',
    info.items[0],
  );
  await shot('06-item-field');
  await undo();
  await sleep(250);
  check(
    'undo takes it out of every item again',
    JSON.stringify(await cellsOf()) ===
      JSON.stringify([
        { x: 30, y: 11 },
        { x: 44, y: 55 },
      ]),
    JSON.stringify(await cellsOf()),
  );

  // 9. A node's unconnected `list` input lives in the same params bag as a setting, so it is a count
  //    button too.
  await mutate(`
    const a = __gm.state.project.assets.find((x) => x.id === 'celly');
    a.graph.nodes.push({ id: 'counter', type: 'Count', x: 40, y: 40, params: {} });
    __gm.showTab('graph');
    __gm.state.select({ kind: 'node', assetId: 'celly', nodeId: 'counter', nodeIds: ['counter'] });
    __gm.state.preview();
  `);
  await sleep(300);
  const portButton = await find('0 items');
  check('an unconnected list input reads as an item count', portButton !== null);
  await click(portButton.x, portButton.y);
  await sleep(250);
  check('clicking it opens the List tab on the port', (await json('__gm.tab()')) === 'list');
  info = await json('__gm.list.info()');
  check('titled by the node and the port it belongs to', info.title === 'Count · list', info.title);
  await clickText('+ Item');
  await sleep(250);
  const params = await json(`__gm.state.project.assets.find((a) => a.id === 'celly').graph.nodes[0].params`);
  check(
    'and the item lands in the node params, where the node reads it',
    JSON.stringify(params) === '{"list":[0]}',
    JSON.stringify(params),
  );

  await mutate(`
    const p = __gm.state.project;
    p.assets = p.assets.filter((a) => a.id !== 'celly');
    __gm.state.select(null);
    __gm.showTab('scene');
    __gm.state.preview();
  `);
  await sleep(200);

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