import { describe, expect, it } from 'vitest';
import { newItem, type SongItem } from '../../src/core/music/song';
import {
  clampMove,
  draggedLength,
  droppedLength,
  duplicateOffset,
  moveDelta,
  moved,
  placedCopies,
  split,
  trimDelta,
  trimmed,
} from '../../src/editor/song/songEdit';
import {
  clampTracks,
  HEAD_BOXES,
  headPartAt,
  itemAt,
  itemsWithin,
  sliderValue,
  type SongView,
  TRACK_HEIGHT,
} from '../../src/editor/song/songView';

const BAR = 1920;
const TRACKS = ['t1', 't2', 't3'];
const rows = new Map(TRACKS.map((id, i) => [id, i]));
const tracks = TRACKS.map((id) => ({ id, name: id, volume: 0, pan: 0, mute: false, solo: false }));

function item(
  id: string,
  track: string,
  tick: number,
  length: number,
  extra: Partial<SongItem> = {},
): SongItem {
  return { ...newItem({ track, kind: 'pattern', asset: 'p', tick, length }), id, ...extra };
}

describe('moving and sizing items (#334)', () => {
  const items = [item('a', 't1', BAR, BAR), item('b', 't2', 3 * BAR, BAR)];
  const both = new Set(['a', 'b']);

  it('moves the picked items on the grid, across tracks, never before 0 or off the tracks', () => {
    expect(moveDelta(items, both, rows, 3, items[0]!, BAR + 700, 1, BAR, false)).toEqual({
      ticks: 0,
      tracks: 1,
    });
    expect(moveDelta(items, both, rows, 3, items[0]!, BAR + 1000, 2, BAR, false)).toEqual({
      ticks: BAR,
      tracks: 1,
    });
    expect(moveDelta(items, both, rows, 3, items[0]!, -5000, 0, BAR, false)).toEqual({
      ticks: -BAR,
      tracks: 0,
    });
    expect(moveDelta(items, both, rows, 3, items[0]!, BAR + 7, 0, BAR, true)).toEqual({
      ticks: 7,
      tracks: 0,
    });
    expect(clampMove(items, both, rows, 3, 0, -1)).toEqual({ ticks: 0, tracks: 0 });
    expect(moved(items, both, TRACKS, 480, 1).map((i) => [i.tick, i.track])).toEqual([
      [BAR + 480, 't2'],
      [3 * BAR + 480, 't3'],
    ]);
  });

  it('lengthens by the right end to the grid, and never back past its own start', () => {
    expect(draggedLength(items[0]!, 3 * BAR + 100, BAR, false)).toBe(2 * BAR);
    expect(draggedLength(items[0]!, 0, BAR, false)).toBe(BAR);
    expect(draggedLength(items[0]!, BAR + 5, BAR, true)).toBe(5);
  });

  it('cuts back by the left end what it plays with it, and pulls it out no further than its start', () => {
    const sound = item('s', 't1', BAR, BAR, { kind: 'sound', offset: 0.25 });
    const picked = new Set(['s']);
    // 0.25 s at 120 BPM is 240 ticks: that is as far back as the left end goes.
    expect(trimDelta([sound], picked, sound, 0, 120, false, 120)).toBe(-240);
    expect(trimDelta([sound], picked, sound, 5 * BAR, 120, false, 120)).toBe(BAR - 1);
    const [cut] = trimmed([sound], picked, 480, 120);
    expect([cut!.tick, cut!.length, cut!.offset]).toEqual([BAR + 480, BAR - 480, 0.75]);
    const pattern = item('p', 't1', BAR, BAR, { offset: 120 });
    expect(trimDelta([pattern], new Set(['p']), pattern, 0, 60, false, 120)).toBe(-120);
    expect(trimmed([pattern], new Set(['p']), -120, 120)[0]).toMatchObject({ tick: BAR - 120, offset: 0 });
  });

  it('splits the picked items the point falls inside, and gives the right-hand parts', () => {
    const cut = split(items, new Set(['a', 'b']), BAR + 480, 120);
    expect(cut.items.map((i) => [i.track, i.tick, i.length, i.offset])).toEqual([
      ['t1', BAR, 480, 0],
      ['t1', BAR + 480, BAR - 480, 480],
      ['t2', 3 * BAR, BAR, 0],
    ]);
    expect(cut.right).toEqual([cut.items[1]!.id]);
  });

  it('puts a duplicate right behind the picked items, and a paste on their tracks', () => {
    expect(duplicateOffset(items, both, BAR)).toBe(3 * BAR);
    const copies = placedCopies(items, 480, ['t2', 't3']);
    expect(copies.map((i) => [i.tick, i.track])).toEqual([
      [480, 't2'],
      [480 + 2 * BAR, 't2'],
    ]);
    expect(copies.every((c) => c.id !== 'a' && c.id !== 'b')).toBe(true);
  });

  it('makes a dropped pattern as long as it is, a sound as long as it plays at the tempo, else a bar', () => {
    expect(droppedLength(null, 3 * BAR, 120, BAR)).toBe(3 * BAR);
    expect(droppedLength(1.25, null, 120, BAR)).toBe(1200);
    expect(droppedLength(null, null, 120, BAR)).toBe(BAR);
  });
});

describe('where things are in the Song tab (#334)', () => {
  const view: SongView = { panX: 0, pxPerTick: 0.1, panY: 0 };
  const items = [item('a', 't1', 0, BAR), item('b', 't2', BAR, BAR)];

  it('finds an item and which end of it is under the pointer', () => {
    expect(itemAt(view, items, tracks, { x: 96, y: TRACK_HEIGHT / 2 })).toEqual({ id: 'a', part: 'body' });
    expect(itemAt(view, items, tracks, { x: 190, y: TRACK_HEIGHT / 2 })).toEqual({ id: 'a', part: 'end' });
    expect(itemAt(view, items, tracks, { x: 194, y: TRACK_HEIGHT * 1.5 })).toEqual({
      id: 'b',
      part: 'start',
    });
    expect(itemAt(view, items, tracks, { x: 96, y: TRACK_HEIGHT * 1.5 })).toBeNull();
    expect(itemsWithin(view, items, tracks, { x: 150, y: 10 }, { x: 250, y: TRACK_HEIGHT + 10 })).toEqual([
      'a',
      'b',
    ]);
  });

  it('scrolls no further than the tracks and the row that adds one', () => {
    expect(clampTracks({ ...view, panY: 40 }, 3, 400).panY).toBe(0);
    expect(clampTracks({ ...view, panY: -500 }, 10, 400).panY).toBe(400 - 10 * TRACK_HEIGHT - 28);
  });

  it('tells the parts of a head apart and reads a slider from left to right', () => {
    const { mute, solo, volume, pan } = HEAD_BOXES;
    expect(headPartAt(mute.x + 4, mute.y + 4)).toBe('mute');
    expect(headPartAt(solo.x + 4, solo.y + 4)).toBe('solo');
    expect(headPartAt(volume.x + 10, volume.y + 4)).toBe('volume');
    expect(headPartAt(pan.x + 10, pan.y + 4)).toBe('pan');
    expect(headPartAt(20, 8)).toBe('name');
    expect(sliderValue(volume.x, volume, -60, 6, 0.5)).toBe(-60);
    expect(sliderValue(volume.x + volume.w, volume, -60, 6, 0.5)).toBe(6);
    expect(sliderValue(pan.x + pan.w / 2, pan, -1, 1, 0.05)).toBe(0);
  });
});