feuerwerk/tools/e2e/23-variable-nodes.mjs

import { edge, node, port, variable } from '../lib/builders.mjs';
import { MAKE_OBJECT } from './lib/scaffold.mjs';

/**
 * Get variables / Set variables: one node for several of them. Their ports are the behavior's
 * variables, so the step checks all three sides of that – the run, the picking of a port from the
 * variable list, and pointing an existing port at another variable without losing its edge.
 *
 * The step brings its own box and behavior; everything it adds is removed at the end.
 */

const SCALE = 100;

/**
 * `On update → Set variables{vx = 2, vy = 3} → Move(owner, dx = vx, dy = vy)`, where the two
 * numbers reach Move through the *variables* – one node writes both, one node reads both back.
 * Neither speed is on the Move node, so a node that dropped a port would leave the box still.
 */
const logicGraph = {
  nodes: [
    node('vp-update', 'OnUpdate', 0, 0),
    node('vp-owner', 'Owner', 0, 300),
    node('vp-set', 'SetVariables', 260, 0, { vx: 2, vy: 3 }, [port('vx', 'number'), port('vy', 'number')]),
    node('vp-get', 'GetVariables', 260, 180, {}, [port('vx', 'number'), port('vy', 'number')]),
    node('vp-move', 'Move', 560, 0, { scale: SCALE }),
  ],
  edges: [
    edge('vp-e1', 'vp-update', 'exec', 'vp-set', 'exec'),
    edge('vp-e2', 'vp-set', 'exec', 'vp-move', 'exec'),
    edge('vp-e3', 'vp-get', 'vx', 'vp-move', 'dx'),
    edge('vp-e4', 'vp-get', 'vy', 'vp-move', 'dy'),
    edge('vp-e5', 'vp-update', 'dt', 'vp-move', 'dt'),
    edge('vp-e6', 'vp-owner', 'object', 'vp-move', 'object'),
  ],
};

export async function variableNodes(t) {
  const { check, sleep, evaluate, json, shot, click, locate, undo, entity, asset, mutate, stop } = t;
  const portAt = (nodeId, key, isOutput) =>
    json(`__gm.graph.portAt(${JSON.stringify(nodeId)}, ${JSON.stringify(key)}, ${isOutput})`);
  const portsOf = async (nodeId) =>
    (await asset('vp-logic')).graph.nodes.find((n) => n.id === nodeId).ports ?? [];
  const select = async (nodeId) => {
    await evaluate(
      `__gm.state.select({ kind: 'node', assetId: 'vp-logic', nodeId: ${JSON.stringify(nodeId)}, nodeIds: [${JSON.stringify(nodeId)}] })`,
    );
    await sleep(300);
  };
  /** The inspector is drawn over the graph, so the last match is the row rather than the port. */
  const clickLast = async (text) => {
    const p = await locate(text, true);
    await click(p.x, p.y);
    await sleep(200);
  };

  // 23a. A box wearing a behavior whose two speeds travel through its variables.
  await mutate(`
    const p = __gm.state.project;
    const scene = __gm.state.activeScene;
    const mover = p.assets.find((a) => a.id === 'mover');
    const a = structuredClone(mover);
    Object.assign(a, {
      id: 'vp-logic',
      name: 'Speeds',
      props: { enabled: true, runInEditor: false, vx: 0, vy: 0, vz: 0 },
      variables: ${JSON.stringify([variable('vx', 'number', 0), variable('vy', 'number', 0), variable('vz', 'number', 0)])},
      graph: ${JSON.stringify(logicGraph)},
    });
    p.assets.unshift(a);
    ${MAKE_OBJECT}
    scene.objects.push(make('vp-box', 'crate', '', 900, 'Speedy box'), make('vp-brain', 'vp-logic', 'vp-box', 900, 'Speeds'));
  `);
  await sleep(400);

  // 23b. The run: both variables are written by one node and read back by another, and the two
  //      speeds stay apart – 2 to the right for every 3 down.
  await t.play();
  await sleep(300);
  const before = await entity('vp-box');
  await sleep(1000);
  const after = await entity('vp-box');
  const dx = after.x - before.x;
  const dy = after.y - before.y;
  check(
    'one node writes both variables, another reads both back, and the run uses them',
    dx > SCALE * 1.4 && dx < SCALE * 2.6 && dy > SCALE * 2.4 && dy < SCALE * 3.6,
    `moved (${dx.toFixed(1)}, ${dy.toFixed(1)}) px in ~1 s – (200, 300) means both ports carried their own variable`,
  );
  await stop();
  await sleep(300);

  // 23c. The node draws one port per variable it names, on the side its type says.
  await select('vp-set');
  const vxIn = await portAt('vp-set', 'vx', false);
  const vyIn = await portAt('vp-set', 'vy', false);
  const vxOut = await portAt('vp-get', 'vx', true);
  check(
    'the picked variables are ports: inputs on Set, outputs on Get',
    Boolean(vxIn) && Boolean(vyIn) && vyIn.y > vxIn.y && Boolean(vxOut),
    JSON.stringify({ vxIn, vyIn, vxOut }),
  );

  // 23d. The inspector picks a port from the behavior's variables instead of having it typed.
  const add = await locate('+ Variable');
  check('the node offers its variables in the inspector', Boolean(add), JSON.stringify(add));
  await shot('01-variable-ports');
  await click(add.x, add.y);
  await sleep(200);
  await clickLast('vz');
  await sleep(300);
  const grown = await portsOf('vp-set');
  check(
    'picking one adds it as a port, typed from the variable',
    grown.length === 3 && grown[2].key === 'vz' && grown[2].kind === 'number',
    JSON.stringify(grown),
  );
  check('and the node grew that input', Boolean(await portAt('vp-set', 'vz', false)));
  await shot('02-variable-added');
  await undo();
  await sleep(300);
  check('undo takes it back', (await portsOf('vp-set')).length === 2);

  // 23e. Pointing a port at another variable keeps the edge hanging on it – a correction, not a
  //      rewiring. `vp-e3` runs from this port to Move's dx.
  await select('vp-get');
  await clickLast('vx');
  await sleep(200);
  await clickLast('vz');
  await sleep(300);
  const swapped = await portsOf('vp-get');
  const edgeStill = await json(
    `(__gm.state.project.assets.find((a) => a.id === 'vp-logic').graph.edges.find((e) => e.id === 'vp-e3') || {}).from`,
  );
  check(
    'a port pointed at another variable keeps its edge',
    swapped[0].key === 'vz' && edgeStill.port === 'vz',
    JSON.stringify({ swapped, edgeStill }),
  );
  await undo();
  await sleep(300);
  check('and undo points it back', (await portsOf('vp-get'))[0].key === 'vx');

  // 23f. A Pack keeps declaring its own fields, but a variable that already carries the shape can
  //      hand it over. A color field arrives as a number port – the graph has no colors.
  await mutate(`
    const a = __gm.state.project.assets.find((x) => x.id === 'vp-logic');
    a.variables.push(
      ${JSON.stringify(
        variable('piece', 'struct', { shape: 0, tint: 0, cells: [] }, undefined, [
          { key: 'shape', kind: 'number' },
          { key: 'tint', kind: 'color' },
          { key: 'cells', kind: 'list', items: 'number' },
        ]),
      )},
      ${JSON.stringify(
        variable('shapes', 'list', [], 'struct', [
          { key: 'x', kind: 'number' },
          { key: 'y', kind: 'number' },
        ]),
      )},
    );
    a.props.piece = { shape: 0, tint: 0, cells: [] };
    a.props.shapes = [];
    a.graph.nodes.push(${JSON.stringify(node('vp-pack', 'PackStruct', 560, 400))});
  `);
  await sleep(300);

  await select('vp-pack');
  const from = await locate('From variable');
  check('a Pack offers the shapes its behavior declares', Boolean(from), JSON.stringify(from));
  await click(from.x, from.y);
  await sleep(200);
  await shot('03-from-variable');
  await clickLast('piece');
  await sleep(300);
  const seeded = await portsOf('vp-pack');
  check(
    'picking a struct variable declares every field at once, a color among them as a number',
    JSON.stringify(seeded) ===
      '[{"key":"shape","kind":"number"},{"key":"tint","kind":"number"},{"key":"cells","kind":"list"}]',
    JSON.stringify(seeded),
  );
  check('and the node grew those inputs', Boolean(await portAt('vp-pack', 'cells', false)));
  await shot('04-fields-seeded');
  await undo();
  await sleep(300);
  check('one undo takes all of them back', (await portsOf('vp-pack')).length === 0);

  // 23g. A list of structs declares the shape of its items, which is the bundle a Pack builds for it.
  await click(from.x, from.y);
  await sleep(200);
  await clickLast('shapes (item)');
  await sleep(300);
  const fromItem = await portsOf('vp-pack');
  check(
    'a list of structs offers its item shape too',
    fromItem.map((p) => p.key).join(',') === 'x,y',
    JSON.stringify(fromItem),
  );
  await undo();
  await sleep(300);

  // 23h. A behavior's own inputs are not fields of a bundle, so the helper stays out of that section.
  await mutate(`
    __gm.state.project.assets.find((x) => x.id === 'vp-logic').graph.nodes.push(
      ${JSON.stringify(node('vp-start', 'BehaviorStart', 560, 600))},
    );
  `);
  await sleep(200);
  await select('vp-start');
  // `locate` throws when the text is absent, which is the wrong shape for "is it there?".
  const helper = await json(`__gm.locate('From variable', false)`);
  check(
    'a behavior start declares inputs, not fields, and is not offered a shape',
    Boolean(await locate('+ Input')) && helper === null,
    JSON.stringify(helper),
  );

  await mutate(`
    const p = __gm.state.project;
    p.assets = p.assets.filter((a) => a.id !== 'vp-logic');
    const scene = __gm.state.activeScene;
    scene.objects = scene.objects.filter((o) => o.id !== 'vp-box' && o.id !== 'vp-brain');
    __gm.state.select(null);
    __gm.state.preview();
  `);
  await sleep(300);
  const left = await json('__gm.state.project.assets.filter((a) => a.id === "vp-logic").length');
  check('the step leaves the fixture as it found it', left === 0, String(left));
}