/** The asset panel: placing by dragging into the view, creating through "+", and resetting an asset value. */
export async function assets(t) {
  const {
    check,
    sleep,
    evaluate,
    json,
    shot,
    click,
    doubleClick,
    clickText,
    mouse,
    mutate,
    press,
    redo,
    undo,
    select,
    objects,
    asset,
    showTab,
  } = t;

  // 4a. Context menu on the Crate asset. Placing left the menu when it became a drag.
  await clickText('Crate', 'right');
  check('asset context menu opens', Boolean(await evaluate(`__gm.locate('Delete…')`)));
  check('placing is no longer a menu item', !(await evaluate(`__gm.locate('Place in scene')`)));
  await shot('11-context-menu');
  await press('Escape');

  // 4b. Drag the Crate asset from the panel into the scene view. Driven step by step rather than
  //     with `drag()`, because the preview only exists while the button is still down.
  const from = await json("__gm.assetRow('crate')");
  const centre = await json('__gm.viewportCenter()');
  const to = { x: centre.x + 70, y: centre.y - 50 };
  await mouse('mouseMoved', from.x, from.y);
  await mouse('mousePressed', from.x, from.y);
  for (let i = 1; i <= 8; i++) {
    const x = from.x + ((to.x - from.x) * i) / 8;
    const y = from.y + ((to.y - from.y) * i) / 8;
    await mouse('mouseMoved', x, y, 'left', { buttons: 1 });
    await sleep(16);
  }
  const preview = await json('__gm.dropPreview()');
  check(
    'dragging an asset over the view previews where it would land',
    Boolean(preview) && preview.assetId === 'crate' && preview.rejection === '',
    JSON.stringify(preview),
  );
  await shot('11b-drop-preview');
  await mouse('mouseReleased', to.x, to.y);
  await sleep(200);

  const count = (await objects()).length;
  check('dropping the asset adds an object', count === 8, `objects=${count}`);
  const placed = await json(
    '(() => { const id = __gm.state.selectedObjectIds[0]; return __gm.sceneObjects().find(o => o.id === id) ?? null; })()',
  );
  // The preview is a promise: whatever it drew has to be where the object then sits, or the
  // outline was decoration rather than a prediction.
  check(
    'the object lands where the preview promised, and is selected',
    Boolean(placed) &&
      placed.assetId === 'crate' &&
      placed.position.x === preview.x &&
      placed.position.y === preview.y,
    JSON.stringify({ placed: placed && placed.position, preview }),
  );
  check('the preview is gone once the asset is placed', (await json('__gm.dropPreview()')) === null);
  await undo();
  const afterUndo = (await objects()).length;
  check('one undo takes the dropped object back out', afterUndo === 7, `objects=${afterUndo}`);
  await redo();
  check('redo puts it back', (await objects()).length === 8);

  // 4c. Create a new asset through the + menu. Since #43 the menu is two alphabetical groups –
  //     what can be placed in a scene, a line, then what only lives in the library – and it is
  //     tall enough to show all fifteen types without scrolling.
  await clickText('+');
  const rows = await json('__gm.menuRows()');
  const cut = rows.indexOf(null);
  const placeable = rows.slice(0, cut);
  const library = rows.slice(cut + 1);
  check(
    'the + menu is split by exactly one line',
    rows.filter((r) => r === null).length === 1 && cut > 0,
    JSON.stringify(rows),
  );
  check(
    'every asset type is offered once, each group sorted by label',
    placeable.length + library.length === 15 &&
      String(placeable) === String([...placeable].sort()) &&
      String(library) === String([...library].sort()),
    JSON.stringify({ placeable, library }),
  );
  check(
    'placeable types come first, the library ones after the line',
    placeable.includes('Sprite') &&
      !placeable.includes('Scene') &&
      library.includes('Scene') &&
      library.includes('Texture'),
    JSON.stringify({ placeable, library }),
  );
  // The height cap is the canvas, not a constant: fifteen entries used to run under the mask edge,
  // where `locate` still finds them but a click lands on nothing (that is what took step 30 down).
  await shot('tmp-plus-menu');
  const menuBox = await json('__gm.overlayRect()');
  const lastRow = await evaluate(`__gm.locate(${JSON.stringify(library.at(-1))}, true)`);
  const screenH = await json('__gm.app.screen.height');
  check(
    'the whole menu stands on screen, last entry clickable',
    Boolean(lastRow) &&
      lastRow.y < menuBox.y + menuBox.h &&
      menuBox.y + menuBox.h <= screenH &&
      menuBox.y >= 0,
    JSON.stringify({ menuBox, lastRow, screenH }),
  );
  // A tenth of the canvas stays free below every popup. The margin used to live only in the height
  // cap, never in the placement, so a popup that had to be shifted up ended flush on the bottom
  // edge with the whole gap collected above it. Above it is a budget, not a distance: this menu
  // hangs off a button near the top and stays there.
  const above = menuBox.y;
  const below = screenH - (menuBox.y + menuBox.h);
  const margin = Math.round(screenH * 0.1);
  check(
    'the menu keeps a tenth of the canvas free below, and stays under its button',
    below >= margin - 1 && above >= 0 && above < margin,
    JSON.stringify({ above, below, margin, screenH }),
  );
  await clickText('Sprite');
  const names = await json('__gm.state.project.assets.map(a => a.name)');
  check('+ menu creates a sprite asset', names.includes('Sprite'), JSON.stringify(names));
  await shot('12-new-asset');

  // 4d. Double-click on a scene row: the one thing activating an asset still does since placing
  //     became a drag. The second scene goes in through the model – the "+" menu's "Scene" entry
  //     shares its label with the Scene tab, so a click by text could land on either.
  await mutate(
    `__gm.state.project.assets.push({ id: 'scene2', type: 'scene', name: 'Level 2', props: { backgroundColor: 0x22252c }, objects: [] })`,
  );
  const secondScene = await json("__gm.assetRow('scene2')");
  await showTab('graph');
  await doubleClick(secondScene.x, secondScene.y);
  check(
    'double-clicking a scene asset makes it the active scene',
    (await json('__gm.state.project.activeSceneId')) === 'scene2',
    await json('__gm.state.project.activeSceneId'),
  );
  check('and opens the Scene tab', (await json('__gm.tab()')) === 'scene', await json('__gm.tab()'));
  const firstScene = await json("__gm.assetRow('scene1')");
  await doubleClick(firstScene.x, firstScene.y);
  check(
    'double-clicking the first one switches back',
    (await json('__gm.state.project.activeSceneId')) === 'scene1',
    await json('__gm.state.project.activeSceneId'),
  );
  await mutate(`__gm.state.project.assets = __gm.state.project.assets.filter((a) => a.id !== 'scene2')`);

  // 4d′. Opening an asset: a click on its row only selects, a double-click opens the tab it
  //      lives in – every type that has one. The fixture lacks four of them; they go in through
  //      the model, empty.
  await mutate(`__gm.state.project.assets.push(
    { id: 'sm-open', type: 'statemachine', name: 'Machine', props: {}, graph: { nodes: [], edges: [] } },
    { id: 'tex-open', type: 'texture', name: 'Sheet', props: {}, file: '', width: 0, height: 0, frames: [] },
    { id: 'anim-open', type: 'animation', name: 'Walk', props: {}, frames: [] },
    { id: 'box-open', type: 'container', name: 'Box', props: {}, objects: [] },
  )`);
  const openable = [
    ['mover', 'graph', '__gm.graph.current()'],
    ['sm-open', 'statemachine', '__gm.stateMachine.current()'],
    ['adjust-colors', 'shader', '__gm.shader.current()'],
    ['tex-open', 'texture', '__gm.texture.current()'],
    ['anim-open', 'animation', '__gm.animation.current().assetId'],
    ['box-open', 'container', '__gm.container.current()'],
  ];
  for (const [id, tab, shown] of openable) {
    await showTab('scene');
    const row = await json(`__gm.assetRow(${JSON.stringify(id)})`);
    await click(row.x, row.y);
    await sleep(500); // past the double-click window, so the next press starts a fresh pair
    const clicked = {
      tab: await json('__gm.tab()'),
      selected: (await json('__gm.state.selection'))?.assetId,
    };
    check(
      `a click on the ${tab} asset selects it and leaves the Scene tab alone`,
      clicked.tab === 'scene' && clicked.selected === id,
      JSON.stringify(clicked),
    );
    await doubleClick(row.x, row.y);
    const opened = { tab: await json('__gm.tab()'), shown: await json(shown) };
    check(
      `a double-click opens the ${tab} tab on it`,
      opened.tab === tab && opened.shown === id,
      JSON.stringify(opened),
    );
  }
  // Enter goes the same way (`onActivate`), but only once the list holds keyboard focus, which a
  // click does not give it – so it is not driven here.
  await showTab('scene');
  await clickText('+');
  const entry = await evaluate(`__gm.locate('Behavior', true)`);
  await click(entry.x, entry.y);
  const created = await json(
    "(__gm.state.project.assets.find((a) => a.type === 'behavior' && !['mover', 'spawner'].includes(a.id)) ?? {}).id ?? ''",
  );
  const fresh = { created, tab: await json('__gm.tab()'), shown: await json('__gm.graph.current()') };
  check(
    'creating an asset through + opens its tab on the new one',
    Boolean(created) && fresh.tab === 'graph' && fresh.shown === created,
    JSON.stringify(fresh),
  );
  await undo();
  await mutate(
    `__gm.state.project.assets = __gm.state.project.assets.filter((a) => !['sm-open', 'tex-open', 'anim-open', 'box-open'].includes(a.id))`,
  );
  await showTab('scene');

  // 4e. Asset defaults: the Crate deviates in height (60 against the schema's 100) and colour,
  //     so two rows carry a reset. Rows run Enabled, Width, Height, Color, Texture, so height's
  //     reset is the first on screen and colour's the last.
  await select({ kind: 'asset', assetId: 'crate' });
  const heightReset = await evaluate(`__gm.locate('↺')`);
  const colorReset = await evaluate(`__gm.locate('↺', true)`);
  check('asset inspector shows a reset per deviating property', Boolean(heightReset));
  check(
    'the two deviations have two separate resets',
    Boolean(colorReset) && colorReset.y > heightReset.y,
    JSON.stringify({ heightReset, colorReset }),
  );
  await click(heightReset.x, heightReset.y);
  check(
    'reset puts the asset property back to its default',
    (await asset('crate')).props.height === 100,
    `height=${(await asset('crate')).props.height}`,
  );
  const remaining = await evaluate(`__gm.locate('↺')`);
  check(
    'the reset of the property now at its default is gone, the other one stays',
    Boolean(remaining) &&
      remaining.y === colorReset.y &&
      remaining.y === (await evaluate(`__gm.locate('↺', true)`)).y,
    JSON.stringify({ remaining, colorReset }),
  );
  await shot('15-asset-reset');
  await undo();
  check(
    'undo restores the asset value',
    (await asset('crate')).props.height === 60,
    `height=${(await asset('crate')).props.height}`,
  );
  check(
    'the height reset is back after undo',
    (await evaluate(`__gm.locate('↺')`))?.y === heightReset.y,
    JSON.stringify(await evaluate(`__gm.locate('↺')`)),
  );

  // 4f. The same gold in the asset list: a row is marked while the asset carries anything the
  //      inspector marks. The Crate deviates twice, so it takes two resets to turn it plain.
  const GOLD = '#f2c84b';
  const PLAIN = '#e6e8ee';
  const assetColor = (id) => json(`__gm.assetRowColor('${id}')`);
  check('a deviating asset is marked gold in the list', (await assetColor('crate')) === GOLD);
  check('an asset at its defaults is not', (await assetColor('cam')) === PLAIN, await assetColor('cam'));
  // The Mover's `speed` is 200 against a declared variable default of 0. The inspector marks no
  // variable, so neither may the list – the two must say the same thing.
  check(
    'a behavior is not marked for a variable value, which the inspector does not mark either',
    (await assetColor('mover')) === PLAIN,
    await assetColor('mover'),
  );
  await click(heightReset.x, heightReset.y);
  check(
    'the mark stays while the second deviation is left',
    (await assetColor('crate')) === GOLD,
    await assetColor('crate'),
  );
  const colorOnly = await evaluate(`__gm.locate('↺')`);
  await click(colorOnly.x, colorOnly.y);
  check(
    'resetting the last deviation clears the mark, without a reload',
    (await assetColor('crate')) === PLAIN,
    `${await assetColor('crate')} props=${JSON.stringify((await asset('crate')).props)}`,
  );
  await shot('15b-asset-marks');
  await undo();
  await undo();
  check(
    'undo brings the mark back',
    (await assetColor('crate')) === GOLD,
    `${await assetColor('crate')} props=${JSON.stringify((await asset('crate')).props)}`,
  );
}