import { same } from '../lib/harness.mjs';

/**
 * Hierarchy / parenting. Gives both crates unique names (later steps locate them by these),
 * then parents by drag, by the inspector menu and unparents from the context menu – the world
 * position is kept every time.
 */
export async function parenting(t) {
  const {
    check,
    json,
    shot,
    click,
    clickText,
    drag,
    locate,
    typeText,
    press,
    undo,
    mutate,
    select,
    object,
    entity,
    stop,
  } = t;

  // 7a. Drag the blue crate's row onto the red crate's row: it becomes a child, keeps its world
  //     position (local becomes the difference) and is listed right below its parent.
  await mutate(`
    const objs = __gm.state.activeScene.objects;
    const o1 = objs.find(o => o.id === 'o1'); const o2 = objs.find(o => o.id === 'o2');
    o1.name = 'Red crate'; o1.position = { x: -150, y: 0, z: 0 };
    o2.name = 'Blue crate'; o2.position = { x: 120, y: -80, z: 0 }; o2.parentId = '';
    __gm.state.select(null)`);
  const redRow = await locate('Red crate');
  const blueRow = await locate('Blue crate');
  await drag(blueRow.x, blueRow.y, redRow.x, redRow.y);
  let o2 = await object('o2');
  check(
    'dropping a row onto another parents it, keeping the world position',
    o2.parentId === 'o1' && o2.position.x === 270 && o2.position.y === -80,
    JSON.stringify(o2),
  );
  const order = await json('(__gm.hierarchyExpandAll(), __gm.hierarchyOrder())');
  // o1's subtree: o2 (list order before o4) with its collider child, then o4, then o1's collider.
  const o1At = order.indexOf('o1');
  check(
    'children are listed directly below their parent',
    same(order.slice(o1At + 1, o1At + 5), ['o2', 'oc2', 'o4', 'oc1']),
    JSON.stringify(order),
  );
  await shot('20-parented');

  // 7b. Moving the parent (X field of the red crate) drags the child along in world space.
  await clickText('Red crate');
  const xField = await locate('X');
  await click(xField.x + 160, xField.y);
  await press('a', { ctrl: true });
  await typeText('-50');
  await press('Enter');
  o2 = await object('o2');
  const parent = await object('o2').then((o) => object(o.parentId));
  const worldOfO2 = { x: o2.position.x + parent.position.x, y: o2.position.y + parent.position.y };
  check(
    'moving the parent moves the child in world space (local unchanged)',
    o2.position.x === 270 && same(worldOfO2, { x: 220, y: -80 }),
    `${JSON.stringify(o2.position)} world=${JSON.stringify(worldOfO2)}`,
  );

  // 7c. Play: entities mirror the hierarchy; undo restores parent and position.
  await select(null);
  await press('Enter', { ctrl: true });
  const e2 = await entity('o2');
  check(
    'play instantiates the parent link and world positions',
    e2 && e2.parent === 'o1' && e2.worldX === 220 && e2.x === 270,
    JSON.stringify(e2),
  );
  await stop();
  await undo(); // move
  await undo(); // parent
  o2 = await object('o2');
  check(
    'undo restores top level and the original local position',
    o2.parentId === '' && o2.position.x === 120 && o2.position.y === -80,
    JSON.stringify(o2),
  );

  // 7d. Parent via the inspector menu: the picker is searchable, Enter takes the single match.
  await clickText('Blue crate');
  await clickText('None'); // the Parent dropdown, labelled with the current parent
  const entries = await json('__gm.overlayTexts()');
  check(
    'the parent picker offers a search box and lists the candidates',
    entries.includes('Search…') && entries.includes('None') && entries.includes('Red crate'),
    JSON.stringify(entries),
  );
  await typeText('red');
  const filtered = await json('__gm.overlayTexts()');
  check(
    'typing filters the picker down to the matching entries',
    same(filtered, ['red', 'Red crate']),
    JSON.stringify(filtered),
  );
  await shot('30-parent-search');
  await press('Enter'); // takes the first match
  o2 = await object('o2');
  check(
    'inspector Parent menu parents the object',
    o2.parentId === 'o1' && o2.position.x === 270,
    JSON.stringify(o2),
  );
  check('the picker closed after Enter', same(await json('__gm.overlayTexts()'), []));
  const blueRow2 = await locate('Blue crate');
  await click(blueRow2.x, blueRow2.y, 'right');
  await clickText('Unparent (move to top level)');
  o2 = await object('o2');
  check(
    'Unparent moves the object to the top level, keeping its world position',
    o2.parentId === '' && o2.position.x === 120 && o2.position.y === -80,
    JSON.stringify(o2),
  );

  // 7e. The gap above a row is a different drop than the row itself: it orders the dragged
  //      object among that row's siblings instead of putting it inside, and moves nothing.
  const rowsBefore = await json('__gm.hierarchyOrder()');
  check(
    'the blue crate is listed after the red one to begin with',
    rowsBefore.indexOf('o2') > rowsBefore.indexOf('o1'),
    JSON.stringify(rowsBefore),
  );
  const redRow3 = await locate('Red crate');
  const blueRow3 = await locate('Blue crate');
  // 10 px above the centre of a 26 px row is its top quarter – the gap, not the row.
  await drag(blueRow3.x, blueRow3.y, redRow3.x, redRow3.y - 10);
  const rowsAfter = await json('__gm.hierarchyOrder()');
  o2 = await object('o2');
  check(
    'dropping into the gap reorders instead of parenting',
    rowsAfter.indexOf('o2') < rowsAfter.indexOf('o1') && o2.parentId === '',
    JSON.stringify({ rowsAfter, parentId: o2.parentId }),
  );
  check(
    'and a reorder moves nothing in the world',
    o2.position.x === 120 && o2.position.y === -80,
    JSON.stringify(o2.position),
  );
  await shot('31-reordered');
  await undo();
  check(
    'undo puts the order back',
    same(await json('__gm.hierarchyOrder()'), rowsBefore),
    JSON.stringify(await json('__gm.hierarchyOrder()')),
  );
}