/**
 * The Composition tab (#417). A sprite dragged in from the Assets panel becomes an item, 3 s long
 * and picked, so the inspector shows its TIMING; a second one dropped onto the first lands right
 * after it. A dragged end stops at the next item. An animation dragged in becomes a clip that moves
 * the item it overlaps in the picture. The hierarchy lists what is alive at the playhead, Delete
 * takes an item with its object, and Play runs the playhead to the end. The video of an item about
 * to begin is opened ahead, so the cut to it shows its picture at once.
 *
 * Everything it adds carries a `ct69` id and goes again at the end.
 */
import { readFileSync } from 'node:fs';
import { uploadVideo } from '../lib/projects.mjs';

const CUT = 'ct69-cut';
const BOX = 'ct69-box';
const SLIDE = 'ct69-slide';
const VIDEO = 'ct69-video';
const SCREEN = 'ct69-screen';

export async function compositionTab(t) {
  const { check, sleep, json, evaluate, mutate, mouse, drag, press, showTab } = t;
  /** Drags a row of the Assets panel to a point step by step: the drop only exists while the button is down. */
  const dragAsset = async (assetId, to) => {
    // A press on the row of the drag before, this soon, would read as a double-click that opens it.
    await sleep(450);
    const from = await json(`__gm.assetRow(${JSON.stringify(assetId)})`);
    await mouse('mouseMoved', from.x, from.y);
    await mouse('mousePressed', from.x, from.y);
    for (let i = 1; i <= 8; i++) {
      await mouse(
        'mouseMoved',
        from.x + ((to.x - from.x) * i) / 8,
        from.y + ((to.y - from.y) * i) / 8,
        'left',
        {
          buttons: 1,
        },
      );
      await sleep(16);
    }
    const drop = await json('__gm.composition.drop()');
    await mouse('mouseReleased', to.x, to.y);
    await sleep(200);
    return drop;
  };
  const model = () =>
    json(`(() => {
      const c = __gm.state.project.assets.find((a) => a.id === '${CUT}');
      return { objects: c.objects.map((o) => o.id), items: c.items, clips: c.clips };
    })()`);

  await press('Escape');
  await showTab('scene');
  // Ten frames a second keeps the numbers small: an item of 3 s is 30 frames, the slide 5.
  await mutate(`
    const p = __gm.state.project;
    p.assets.push(
      { id: '${CUT}', type: 'composition', name: 'Cut 69', props: { fps: 10, loop: false }, objects: [], groups: [],
        tracks: [{ id: 'ct69-t1', name: 'Front' }, { id: 'ct69-t2', name: 'Back' }], items: [], clips: [] },
      { id: '${BOX}', type: 'sprite', name: 'Box 69', props: { width: 100, height: 100, color: 0xff0000, texture: '' } },
      { id: '${SLIDE}', type: 'animation', name: 'Slide 69', props: { fps: 10, playback: 'once' }, root: '${BOX}',
        tracks: [{ id: 'ct69-row', target: '', property: 'x', keys: [{ frame: 0, value: 0 }, { frame: 5, value: 100 }] }] },
    );`);
  await evaluate(`__gm.state.openAsset('${CUT}')`);
  await sleep(300);
  const opened = await json(`{ tab: __gm.tab(), current: __gm.composition.current() }`);
  check(
    'opening a composition brings up its tab',
    opened.tab === 'composition' && opened.current === CUT,
    JSON.stringify(opened),
  );

  // 69a. A sprite dropped on the first track at frame 5 is an item there, 3 s long, picked.
  const first = await dragAsset(BOX, await json(`__gm.composition.laneAt('ct69-t1', 5)`));
  let m = await model();
  const a = m.items[0];
  const picked = await json('__gm.state.selection');
  check(
    'a sprite dragged onto a track becomes an item where it is let go, 3 s long and picked',
    first?.what === 'item' &&
      first.rejection === '' &&
      m.items.length === 1 &&
      a.start === 5 &&
      a.length === 30 &&
      a.fitMedia === true &&
      JSON.stringify(m.objects) === JSON.stringify([a.id]) &&
      picked?.kind === 'object' &&
      picked.holderId === CUT &&
      picked.objectId === a.id,
    JSON.stringify({ first, m, picked }),
  );
  const timing = await json(`__gm.section('TIMING')`);
  check('the inspector shows the picked item’s TIMING', timing !== null, JSON.stringify(timing));

  // 69b. A second one let go over the first lands right after it.
  await dragAsset(BOX, await json(`__gm.composition.laneAt('ct69-t1', 20)`));
  m = await model();
  const b = m.items.find((i) => i.id !== a.id);
  check(
    'one dropped onto an item lands right after it',
    m.items.length === 2 && b?.start === 35 && b.length === 30,
    JSON.stringify(m.items),
  );

  // 69c. The first item's end dragged past the second stops where the second begins.
  const box = await json(`__gm.composition.box('${a.id}')`);
  const far = await json(`__gm.composition.laneAt('ct69-t1', 60)`);
  await drag(box.x + box.w - 2, box.y + box.h / 2, far.x, box.y + box.h / 2);
  await sleep(150);
  m = await model();
  const resized = m.items.find((i) => i.id === a.id);
  check(
    'a dragged end stops where the next item begins, and the length is the item’s own then',
    resized?.length === 30 && resized.fitMedia === undefined,
    JSON.stringify(resized),
  );

  // 69d. The animation dropped at frame 5 is a clip one pass long that moves the item in the picture.
  const clipDrop = await dragAsset(SLIDE, await json(`__gm.composition.laneAt('ct69-t1', 5)`));
  m = await model();
  const x = async (frame) => {
    await evaluate(`__gm.composition.scrub(${frame})`);
    await sleep(60);
    return (await json('__gm.composition.shown()')).find((o) => o.id === a.id)?.x ?? null;
  };
  const xs = [await x(5), await x(8), await x(20)];
  check(
    'an animation dragged onto a track becomes a clip, and moves the item it overlaps in the picture',
    clipDrop?.what === 'clip' &&
      m.clips.length === 1 &&
      m.clips[0].start === 5 &&
      m.clips[0].animation === SLIDE &&
      xs[0] === 0 &&
      xs[1] === 60 &&
      xs[2] === 100,
    JSON.stringify({ clipDrop, clips: m.clips, xs }),
  );

  // 69e. The hierarchy lists what is alive at the playhead – read off the rows it shows.
  const rowsAt = async (frame) => {
    await evaluate(`__gm.composition.scrub(${frame})`);
    await sleep(80);
    const shown = await json(`[${m.items.map((i) => `__gm.hierarchyRow('${i.id}')`).join(',')}]`);
    return m.items.filter((_, n) => shown[n] !== null).map((i) => i.id);
  };
  const rows = [await rowsAt(2), await rowsAt(10), await rowsAt(40)];
  check(
    'the hierarchy lists the items alive at the playhead',
    rows[0].length === 0 &&
      JSON.stringify(rows[1]) === JSON.stringify([a.id]) &&
      JSON.stringify(rows[2]) === JSON.stringify([b.id]),
    JSON.stringify(rows),
  );

  // 69f. Delete takes the picked item with its object; undo brings both back.
  await evaluate(`__gm.state.select({ kind: 'object', holderId: '${CUT}', objectId: '${b.id}' })`);
  await press('Delete');
  await sleep(150);
  const gone = await model();
  await press('z', { ctrl: true });
  await sleep(150);
  const back = await model();
  check(
    'Delete takes an item with its object, undo brings both back',
    !gone.items.some((i) => i.id === b.id) &&
      !gone.objects.includes(b.id) &&
      back.items.some((i) => i.id === b.id) &&
      back.objects.includes(b.id),
    JSON.stringify({ gone, back }),
  );

  // 69g. Play runs the playhead from the start to the end of the last item, and stops there.
  await evaluate(`__gm.composition.scrub(0)`);
  const playAt = await json('__gm.composition.playAt()');
  await mouse('mouseMoved', playAt.x, playAt.y);
  await mouse('mousePressed', playAt.x, playAt.y);
  await mouse('mouseReleased', playAt.x, playAt.y);
  await sleep(500);
  const running = await json('__gm.composition.view()');
  let ended = running;
  for (let i = 0; i < 40 && ended.playing; i++) {
    await sleep(150);
    ended = await json('__gm.composition.view()');
  }
  check(
    'Play runs the playhead to the end and stops there',
    running.playing && running.playhead > 0 && !ended.playing && ended.playhead === 65,
    JSON.stringify({ running, ended }),
  );

  // 69h. Two video items back to back: the second one's video is opened a second ahead, so the cut
  // draws its picture in the very redraw it begins – loaded only then, it was left out until it came.
  const uploaded = await uploadVideo(
    t.baseUrl,
    readFileSync(new URL('./fixtures/colors.webm', import.meta.url)),
    'colors.webm',
  );
  await mutate(`
    const p = __gm.state.project;
    p.assets.push(
      { id: '${VIDEO}', type: 'video', name: 'Colors 69', props: {}, file: ${JSON.stringify(uploaded.file)},
        width: 320, height: 180, duration: 2, fps: 30, audio: true },
      { id: '${SCREEN}', type: 'sprite', name: 'Screen 69', props: { width: 160, height: 90, color: 0xffffff, texture: '${VIDEO}' } },
    );
    const c = p.assets.find((a) => a.id === '${CUT}');
    const object = (id) => ({ ...structuredClone(c.objects[0]), id, assetId: '${SCREEN}', overrides: {}, instanceEdits: {} });
    c.objects = [object('ct69-v1'), object('ct69-v2')];
    c.items = [
      { id: 'ct69-v1', track: 'ct69-t1', start: 0, length: 20, offset: 0 },
      { id: 'ct69-v2', track: 'ct69-t1', start: 20, length: 10, offset: 1 },
    ];
    c.clips = [];`);
  const second = `__gm.videos().find((v) => v.key.endsWith(':ct69-v2')) ?? null`;
  await evaluate(`__gm.composition.scrub(5)`);
  await sleep(300);
  const early = await json(second);
  await evaluate(`__gm.composition.scrub(12)`);
  let ahead = null;
  // Settled: a seek still landing would hold the view a frame, which is no picture missing.
  for (let i = 0; i < 40 && !(ahead?.ready && !ahead.seeking && !ahead.landing); i++) {
    await sleep(150);
    ahead = await json(second);
  }
  const cut = await json(
    `(() => { __gm.composition.scrub(20); return __gm.composition.drawn('ct69-v2'); })()`,
  );
  check(
    'a coming video item is opened a second ahead, at its offset, and drawn in the redraw it begins',
    early === null && ahead?.ready && ahead.paused && Math.abs(ahead.time - 1) < 0.05 && cut !== null,
    JSON.stringify({ early, ahead, cut }),
  );

  await showTab('scene');
  await mutate(`
    const p = __gm.state.project;
    p.assets = p.assets.filter((a) => !a.id.startsWith('ct69-'));`);
}