feuerwerk/tests/core/list-item-kind.test.ts

/**
 * A list declares nothing about what it holds: every item carries its own kind, read back off the
 * value – and a color or a texture says so, or it would be a plain number or text.
 */
import { describe, expect, it } from 'vitest';
import { SetOverrideCommand } from '../../src/core/commands/sceneObjectCommands';
import { AddVariableCommand } from '../../src/core/commands/variableCommands';
import { type PropertyValue, tagged, untag } from '../../src/core/model/Properties';
import { findAsset } from '../../src/core/model/Project';
import { deserializeProject } from '../../src/core/store/serialize';
import { itemKindOf, makeItem, structItemFields } from '../../src/core/properties/listItems';
import { makeBehavior, makeSpriteScene, place, roundTrip } from '../helpers';

/** A behavior with a list variable `stops`, placed once with an override of its own. */
function withList(value: unknown = [1, 2]) {
  const f = makeSpriteScene();
  const behavior = makeBehavior(f, 'B');
  f.stack.execute(new AddVariableCommand(behavior.id, 'stops', 'list'));
  const asset = findAsset(f.project, behavior.id)!;
  asset.props.stops = value as never;
  const object = place(f, behavior.id, { x: 0, y: 0 });
  f.stack.execute(new SetOverrideCommand(f.sceneId, object, 'stops', [3]));
  return { f, behaviorId: behavior.id, object };
}

describe('the kind of one list item', () => {
  it('is read off the item itself, a color through its tag', () => {
    expect([7, 'a', true, tagged('color', 0xff0000), { x: 1 }].map(itemKindOf)).toEqual([
      'number',
      'text',
      'boolean',
      'color',
      'struct',
    ]);
  });

  it('lets one list hold all of them at once, through a write and a read back', () => {
    const mixed = [7, 'tee', true, tagged('color', 0xff0000), { x: 1, y: 'two' }];
    const { f, behaviorId } = withList(mixed);
    expect(findAsset(roundTrip(f.project), behaviorId)?.props.stops).toEqual(mixed);
  });

  /** The one kind JSON cannot tell apart from a number, which is why it is tagged at all. */
  it('keeps a color apart from the number beside it', () => {
    const { f, behaviorId } = withList([tagged('color', 0xff0000), 0xff0000]);
    const back = findAsset(roundTrip(f.project), behaviorId)?.props.stops as PropertyValue[];
    expect(back.map(itemKindOf)).toEqual(['color', 'number']);
    expect(back.map(untag)).toEqual([0xff0000, 0xff0000]);
  });

  /**
   * The second kind JSON cannot tell apart on its own: an asset id is a text like any other. What a
   * sprite wears is one id whether it names a texture or one of its frames.
   */
  it('keeps a texture apart from the text beside it, and reads back as its id', () => {
    const { f, behaviorId } = withList([tagged('texture', 'tex-walk'), 'tex-walk']);
    const back = findAsset(roundTrip(f.project), behaviorId)?.props.stops as PropertyValue[];
    expect(back.map(itemKindOf)).toEqual(['texture', 'text']);
    expect(back.map(untag)).toEqual(['tex-walk', 'tex-walk']);
  });

  it('turns a text into a texture item and back without losing the id', () => {
    expect(makeItem('texture', 'frame-26')).toEqual(tagged('texture', 'frame-26'));
    expect(makeItem('text', tagged('texture', 'frame-26'))).toBe('frame-26');
  });

  /** A struct item's field is undeclared too, so a texture there keeps its tag, like a color does. */
  it('stays a texture inside a struct item', () => {
    const { f, behaviorId } = withList([{ pic: tagged('texture', 'frame-26'), n: 1 }]);
    const back = findAsset(roundTrip(f.project), behaviorId)?.props.stops as PropertyValue[];
    expect(back).toEqual([{ pic: tagged('texture', 'frame-26'), n: 1 }]);
    expect(structItemFields(back[0]).map((field) => `${field.key}:${field.kind}`)).toEqual([
      'pic:texture',
      'n:number',
    ]);
  });

  it('changes for one item without touching its neighbours', () => {
    const { f, behaviorId } = withList([1, 2]);
    const asset = findAsset(f.project, behaviorId)!;
    const list = asset.props.stops as PropertyValue[];
    asset.props.stops = [makeItem('text', list[0]), list[1]] as never;
    expect(findAsset(roundTrip(f.project), behaviorId)?.props.stops).toEqual(['1', 2]);
  });

  it('gives a struct item a shape of its own, each field with its own kind', () => {
    const { f, behaviorId } = withList([{ x: 1, label: 'a' }, { x: 2 }]);
    const back = findAsset(roundTrip(f.project), behaviorId)?.props.stops as PropertyValue[];
    expect(back.map((item) => structItemFields(item).map((field) => `${field.key}:${field.kind}`))).toEqual([
      ['x:number', 'label:text'],
      ['x:number'],
    ]);
  });

  it('drops a list inside a struct item, the one level too deep', () => {
    const { f, behaviorId } = withList([{ x: 1, deep: [1, 2] }]);
    expect(findAsset(roundTrip(f.project), behaviorId)?.props.stops).toEqual([{ x: 1 }]);
  });
});

/**
 * A node parameter meets no schema on the way in – `asStoredValue` is the only rule it passes. It is
 * therefore the one place where the store itself has to know the tags.
 */
describe('a list in a node parameter, where nothing is declared', () => {
  const loadParam = (value: unknown) =>
    deserializeProject({
      id: 'p',
      assets: [
        {
          id: 'b',
          type: 'behavior',
          name: 'B',
          graph: { nodes: [{ id: 'n', type: 'List', x: 0, y: 0, params: { value } }], edges: [] },
        },
      ],
    });
  const paramOf = (value: unknown) => {
    const asset = findAsset(loadParam(value), 'b');
    return asset?.type === 'behavior' ? asset.graph.nodes[0]?.params.value : undefined;
  };

  it('keeps a tagged texture an item of its own', () => {
    expect(paramOf([tagged('texture', 'frame-26'), 'frame-26'])).toEqual([
      tagged('texture', 'frame-26'),
      'frame-26',
    ]);
  });

  it('and one inside a struct item as well', () => {
    expect(paramOf([{ pic: tagged('texture', 'frame-26'), n: 1 }])).toEqual([
      { pic: tagged('texture', 'frame-26'), n: 1 },
    ]);
  });
});