feuerwerk/tests/core/list-of-structs.test.ts

import { describe, expect, it } from 'vitest';
import { Fill } from '../../src/core/graph/nodes/data/Fill';
import { IndexOf } from '../../src/core/graph/nodes/data/IndexOf';
import { ItemAt } from '../../src/core/graph/nodes/data/ItemAt';
import { SetItem } from '../../src/core/graph/nodes/data/SetItem';
import { sameValue, tagged, textOf } from '../../src/core/model/Properties';
import { coerceValue, variableDef } from '../../src/core/properties/PropertySchema';
import { makeBehavior, makeSpriteScene, roundTrip } from '../helpers';

const cells = (...pairs: [number, number][]) => pairs.map(([x, y]) => ({ x, y }));

/** A `list` variable holding struct items, the way a seeder writes it. */
const shapesDef = (value: unknown) => variableDef('shapes', 'list', value as never);

/** The node interface only needs `run`; nothing here reads the context. */
const run = (def: { run?: unknown }, inputs: Record<string, unknown>) =>
  (def.run as (ctx: unknown, i: Record<string, unknown>) => { outputs: Record<string, unknown> })({}, inputs)
    .outputs;

describe('a list whose items are structs', () => {
  /** Each item keeps the fields it carries: there is no declaration left to fill or drop any. */
  it('keeps every item the shape it arrived with', () => {
    const def = shapesDef([{ x: 1, y: 2 }, { x: 3 }, { x: 4, y: 5, z: 9 }]);
    expect(def.default).toEqual([{ x: 1, y: 2 }, { x: 3 }, { x: 4, y: 5, z: 9 }]);
  });

  it('keeps a field value as the kind it is, text included', () => {
    expect(coerceValue(shapesDef([]), [{ x: '3', y: 4 }])).toEqual([{ x: '3', y: 4 }]);
  });

  it('leaves a number beside them a number, since an item answers for itself', () => {
    expect(coerceValue(shapesDef([]), [7, { x: 1, y: 2 }])).toEqual([7, { x: 1, y: 2 }]);
  });

  it('survives a save and load with its items intact', () => {
    const f = makeSpriteScene();
    const behavior = makeBehavior(f, 'B');
    const asset = f.project.assets.find((a) => a.id === behavior.id);
    if (asset?.type !== 'behavior') throw new Error('behavior expected');
    asset.variables = [shapesDef(cells([0, 1], [1, 1]))];
    asset.props.shapes = cells([2, 3], [4, 5]);

    const loaded = roundTrip(f.project).assets.find((a) => a.id === behavior.id);
    if (loaded?.type !== 'behavior') throw new Error('behavior expected');
    const def = loaded.variables.find((v) => v.key === 'shapes');
    expect(def?.kind).toBe('list');
    expect(def?.default).toEqual(cells([0, 1], [1, 1]));
    expect(loaded.props.shapes).toEqual(cells([2, 3], [4, 5]));
  });

  it('compares by content, so an unchanged list is not reported as an override', () => {
    expect(sameValue(cells([1, 2]), cells([1, 2]))).toBe(true);
    expect(sameValue(cells([1, 2]), cells([1, 3]))).toBe(false);
    expect(sameValue(cells([1, 2]), cells([1, 2], [3, 4]))).toBe(false);
  });

  it('reads as its items rather than as "[object Object]"', () => {
    expect(textOf(cells([1, 2], [3, 4]))).toBe('x: 1, y: 2, x: 3, y: 4');
  });
});

/**
 * Node params have no schema to coerce against, so the loader alone decides how deep a value may
 * be. The bound has to be the model's own: a list of structs of primitives, and no further.
 */
describe('an untyped slot on load', () => {
  const paramsAfterLoad = (params: Record<string, unknown>) => {
    const f = makeSpriteScene();
    const behavior = makeBehavior(f, 'B');
    const asset = f.project.assets.find((a) => a.id === behavior.id);
    if (asset?.type !== 'behavior') throw new Error('behavior expected');
    asset.graph.nodes.push({ id: 'n1', type: 'List', x: 0, y: 0, params: params as never });

    const loaded = roundTrip(f.project).assets.find((a) => a.id === behavior.id);
    if (loaded?.type !== 'behavior') throw new Error('behavior expected');
    return loaded.graph.nodes.find((n) => n.id === 'n1')?.params ?? {};
  };

  it('keeps a list of structs', () => {
    expect(paramsAfterLoad({ items: cells([1, 2], [3, 4]) }).items).toEqual(cells([1, 2], [3, 4]));
  });

  it('still keeps a struct holding a flat list, which it always did', () => {
    expect(paramsAfterLoad({ v: { tags: ['a', 'b'], n: 1 } }).v).toEqual({ tags: ['a', 'b'], n: 1 });
  });

  it('drops a struct inside a struct, which no declaration can ask for', () => {
    expect(paramsAfterLoad({ v: { inner: { x: 1 }, n: 1 } }).v).toEqual({ n: 1 });
  });

  it('drops a list inside a list item, the level below what a field may hold', () => {
    expect(paramsAfterLoad({ items: [{ deep: [1, 2], x: 1 }] }).items).toEqual([{ x: 1 }]);
  });
});

/**
 * A tagged item is an editor thing: the graph has no colours and no pictures, only numbers and
 * texts. Reading one out therefore hands over what it wraps – the id a sprite can be made to wear.
 */
describe('the list nodes with tagged items', () => {
  it('hands a texture item out as the plain id it holds', () => {
    expect(
      run(ItemAt, { list: [tagged('texture', 'walk-up'), tagged('texture', 'fr-0-1')], index: 1 }),
    ).toEqual({
      item: 'fr-0-1',
    });
  });

  it('and a colour item as its number', () => {
    expect(run(ItemAt, { list: [tagged('color', 0xff0000)], index: 0 })).toEqual({ item: 0xff0000 });
  });

  /** Or searching a list of pictures with the id a `Properties` node just read would never hit. */
  it('finds a texture item by the id beside it', () => {
    expect(run(IndexOf, { list: [tagged('texture', 'a'), tagged('texture', 'b')], value: 'b' })).toEqual({
      index: 1,
    });
  });

  /** The slot keeps its kind, so a list of pictures stays one after the graph has written to it. */
  it('keeps a texture slot a texture when the graph writes a plain id into it', () => {
    expect(run(SetItem, { list: [tagged('texture', 'a')], index: 0, value: 'b' })).toEqual({
      result: [tagged('texture', 'b')],
    });
  });
});

describe('the list nodes with struct items', () => {
  it('hands a whole item out of the list', () => {
    expect(run(ItemAt, { list: cells([1, 2], [3, 4]), index: 1 })).toEqual({ item: { x: 3, y: 4 } });
  });

  it('puts a struct back into a list instead of turning it into text', () => {
    expect(run(SetItem, { list: cells([1, 2], [3, 4]), index: 0, value: { x: 9, y: 9 } })).toEqual({
      result: cells([9, 9], [3, 4]),
    });
  });

  it('finds a struct by its content, since two equal structs are never the same object', () => {
    expect(run(IndexOf, { list: cells([1, 2], [3, 4]), value: { x: 3, y: 4 } })).toEqual({ index: 1 });
    expect(run(IndexOf, { list: cells([1, 2]), value: { x: 9, y: 9 } })).toEqual({ index: -1 });
  });

  it('fills a list with a struct', () => {
    expect(run(Fill, { value: { x: 1, y: 2 }, count: 2 })).toEqual({ result: cells([1, 2], [1, 2]) });
  });
});