feuerwerk/tests/editor/song-lanes.test.ts

import { describe, expect, it, vi } from 'vitest';
import type { AutomationPoint } from '../../src/core/music/automation';
import type { SongTrack } from '../../src/core/music/song';
import type { Project } from '../../src/core/model/Project';
import type { MenuEntry, MenuItem, MenuSubmenu } from '../../src/ui';
import { easingEntries } from '../../src/editor/song/easingMenu';
import {
  addedPoint,
  draggedPoint,
  easedPoint,
  lanePoints,
  withLanePoints,
  withoutPoint,
} from '../../src/editor/song/laneEdit';
import {
  LANE_INSET,
  laneValue,
  laneValueText,
  laneWay,
  laneY,
  pointAt,
  shownLanes,
  songRows,
  trackRows,
} from '../../src/editor/song/laneView';
import { trackAtY, type SongView } from '../../src/editor/song/songView';

function track(id: string, automation?: SongTrack['automation']): SongTrack {
  return {
    id,
    name: id,
    volume: -6,
    pan: 0,
    mute: false,
    solo: false,
    fx: '',
    ...(automation && { automation }),
  };
}

const VOLUME: AutomationPoint[] = [
  { tick: 0, value: -12 },
  { tick: 960, value: 0, ease: 'step' },
  { tick: 1920, value: -24 },
];

describe('the rows of the Song tab with automation lanes (#337)', () => {
  const tracks = [track('a'), track('b', [{ target: 'pan', points: [{ tick: 0, value: 0.5 }] }]), track('c')];

  it('shows the lanes with points until a track is opened or closed by hand', () => {
    expect(shownLanes(tracks[1]!, new Map())).toEqual(['pan']);
    expect(shownLanes(tracks[0]!, new Map())).toEqual([]);
    // Opened by hand the lanes come in their own order, closed by hand even one with points goes.
    expect(shownLanes(tracks[0]!, new Map([['a', ['pan', 'volume'] as const]]))).toEqual(['volume', 'pan']);
    expect(shownLanes(tracks[1]!, new Map([['b', []]]))).toEqual([]);
  });

  it('puts each lane right under its track, and finds a track by the row of its own', () => {
    const open = new Map([['a', ['volume', 'pan'] as const]]);
    const rows = songRows(tracks, open);
    expect(rows).toEqual([
      { track: 0, lane: null },
      { track: 0, lane: 'volume' },
      { track: 0, lane: 'pan' },
      { track: 1, lane: null },
      { track: 1, lane: 'pan' },
      { track: 2, lane: null },
    ]);
    expect([...trackRows(tracks, rows)]).toEqual([
      ['a', 0],
      ['b', 3],
      ['c', 5],
    ]);
    // A lane is as high as a track, so the rows stay evenly spaced.
    const view: SongView = { panX: 0, pxPerTick: 0.1, panY: 0, trackHeight: 40 };
    expect(trackAtY(view, rows.length, 3 * 40 + 1)).toBe(3);
  });
});

describe('the way of a lane (#337)', () => {
  const view: SongView = { panX: 10, pxPerTick: 0.1, panY: 0, trackHeight: 52 };

  it('draws a value from the bottom of its range to the top, and reads it back to a step', () => {
    expect(laneY('volume', -60, 52)).toBe(52 - LANE_INSET);
    expect(laneY('volume', 12, 52)).toBe(LANE_INSET);
    expect(laneY('pan', 0, 52)).toBe(26);
    // Past the range a value is drawn at the edge.
    expect(laneY('pan', 3, 52)).toBe(LANE_INSET);
    expect(laneValue('pan', 26, 52)).toBe(0);
    expect(laneValue('volume', laneY('volume', -6.3, 52), 52)).toBeCloseTo(-6.3, 6);
    expect(laneValue('volume', -100, 52)).toBe(12);
    expect(laneValue('pan', laneY('pan', 0.333, 52), 52)).toBeCloseTo(0.33, 6);
  });

  it('finds the point under the pointer, the last drawn first', () => {
    const points = [
      { tick: 0, value: 0 },
      { tick: 0, value: 0 },
      { tick: 960, value: 6 },
    ];
    const y = laneY('volume', 0, 52);
    expect(pointAt(view, 'volume', points, 10, y)).toBe(1);
    expect(pointAt(view, 'volume', points, 10 + 96 + 5, laneY('volume', 6, 52) - 5)).toBe(2);
    expect(pointAt(view, 'volume', points, 60, y)).toBeNull();
  });

  it('holds before the first point and after the last, and jumps upright on a step', () => {
    const way = laneWay(view, 'volume', VOLUME, 300, 2);
    const at = (x: number) => way.filter((p) => p.x === x).map((p) => p.y);
    // Before the first point (x 10) the lane holds its value.
    expect(at(0)).toEqual([laneY('volume', -12, 52)]);
    // Halfway to the point at tick 960 (x 106) the linear way is at -6 dB, and reaches 0 dB there.
    expect(at(58)).toEqual([laneY('volume', -6, 52)]);
    expect(at(106)).toEqual([laneY('volume', 0, 52)]);
    // The step holds until tick 1920 (x 202), where it jumps to the last point.
    expect(at(200)).toEqual([laneY('volume', 0, 52)]);
    expect(at(202)).toEqual([laneY('volume', 0, 52), laneY('volume', -24, 52)]);
    expect(at(300)).toEqual([laneY('volume', -24, 52)]);
    expect(way.map((p) => p.x)).toEqual([...way.map((p) => p.x)].sort((a, b) => a - b));
  });

  it('says a value as a head and a sign do', () => {
    expect(laneValueText('volume', -6)).toBe('-6.0 dB');
    expect(laneValueText('volume', 3.25)).toBe('+3.3 dB');
    expect(laneValueText('volume', -60)).toBe('-inf dB');
    expect(laneValueText('pan', 0)).toBe('Centre');
    expect(laneValueText('pan', -0.25)).toBe('25% left');
    expect(laneValueText('pan', 1)).toBe('100% right');
  });
});

describe('editing the points of a lane (#337)', () => {
  it('puts the points on their lane, the lanes in their order, and drops a lane without points', () => {
    const a = withLanePoints(
      track('a', [{ target: 'pan', points: [{ tick: 0, value: 1 }] }]),
      'volume',
      VOLUME,
    );
    expect(a.automation?.map((l) => l.target)).toEqual(['volume', 'pan']);
    expect(lanePoints(a, 'volume')).toEqual(VOLUME);
    const b = withLanePoints(a, 'pan', []);
    expect(b.automation?.map((l) => l.target)).toEqual(['volume']);
    expect('automation' in withLanePoints(b, 'volume', [])).toBe(false);
  });

  it('adds a point after the ones already on its tick, held to whole ticks and the range', () => {
    expect(addedPoint(VOLUME, 'volume', 960.4, 3)).toEqual({
      points: [VOLUME[0], VOLUME[1], { tick: 960, value: 3 }, VOLUME[2]],
      index: 2,
    });
    expect(addedPoint([], 'pan', -5, 4)).toEqual({ points: [{ tick: 0, value: 1 }], index: 0 });
  });

  it('drags a point no further than its neighbours, keeping how it eases', () => {
    expect(draggedPoint(VOLUME, 'volume', 1, 5000, -3)[1]).toEqual({ tick: 1920, value: -3, ease: 'step' });
    expect(draggedPoint(VOLUME, 'volume', 1, -10, 99)[1]).toEqual({ tick: 0, value: 12, ease: 'step' });
    expect(draggedPoint(VOLUME, 'volume', 2, 9999.6, -60)[2]).toEqual({ tick: 10000, value: -60 });
    expect(draggedPoint(VOLUME, 'volume', 7, 0, 0)).toEqual(VOLUME);
  });

  it('takes a point away and sets how one eases, linear stored as none', () => {
    expect(withoutPoint(VOLUME, 1)).toEqual([VOLUME[0], VOLUME[2]]);
    expect(easedPoint(VOLUME, 0, 'sine-in')[0]).toEqual({ tick: 0, value: -12, ease: 'sine-in' });
    expect(easedPoint(VOLUME, 1, 'linear')[1]).toEqual({ tick: 960, value: 0 });
  });
});

describe('the easings as a menu (#337)', () => {
  const project = {
    assets: [
      { id: 'c2', type: 'curve', name: 'Swell' },
      { id: 'c1', type: 'curve', name: 'Dip' },
      { id: 'c3', type: 'curve', name: 'Inside', owner: 'song' },
    ],
  } as unknown as Project;
  const byLabel = (entries: MenuEntry[], label: string) =>
    entries.find((e) => 'label' in e && e.label === label) as MenuItem & MenuSubmenu;

  it('offers every easing, marks the one in use and hands back what is picked', () => {
    const set = vi.fn();
    const entries = easingEntries(project, 'cubic-out', set);
    expect(entries.map((e) => ('label' in e ? e.label : '-'))).toEqual([
      'Linear',
      'Step',
      'Sine',
      'Quad',
      'Cubic',
      'Quart',
      'Quint',
      'Expo',
      'Circ',
      'Back',
      'Elastic',
      'Bounce',
      'Curve',
    ]);
    expect(byLabel(entries, 'Linear').current).toBe(false);
    const cubic = byLabel(entries, 'Cubic').submenu as MenuItem[];
    expect(cubic.map((e) => [e.label, e.current])).toEqual([
      ['In', false],
      ['Out', true],
      ['In-out', false],
    ]);
    (byLabel(entries, 'Quad').submenu as MenuItem[])[0]!.onSelect();
    byLabel(entries, 'Step').onSelect();
    expect(set.mock.calls).toEqual([['ease-in'], ['step']]);
  });

  it('lists the Curve assets of the project by name, not those a song keeps to itself', () => {
    const set = vi.fn();
    const curve = byLabel(easingEntries(project, 'curve:c2', set), 'Curve');
    const items = curve.submenu as MenuItem[];
    expect(items.map((e) => [e.label, e.current])).toEqual([
      ['Dip', false],
      ['Swell', true],
    ]);
    items[0]!.onSelect();
    expect(set).toHaveBeenCalledWith('curve:c1');
    expect(
      byLabel(easingEntries({ assets: [] } as unknown as Project, 'linear', set), 'Curve').disabled,
    ).toBe(true);
  });
});