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

/**
 * Shared state: a Variables asset holds one value per key for the whole run, and a state machine
 * declared `global` one current state. The step checks the run (two objects counting into one
 * number), that the node offers the asset's declarations, and the switch on the machine.
 *
 * The step brings its own boxes, behavior, Variables asset and machine; everything goes at the end.
 */

const SOURCE = { variablesAsset: 'sc-vars' };

/** `On start → Variables{set score} ← Add(score, 1)`, counting on the shared asset rather than its own. */
const counterGraph = {
  nodes: [
    node('sc-start', 'OnStart', 0, 0),
    node('sc-read', 'Variables', 0, 200, SOURCE, [port('score', 'number')]),
    node('sc-add', 'Add', 260, 200, { b: 1 }),
    node('sc-write', 'Variables', 560, 0, SOURCE, [written('score', 'number')]),
  ],
  edges: [
    edge('sc-e1', 'sc-start', 'exec', 'sc-write', 'exec'),
    edge('sc-e2', 'sc-read', 'score', 'sc-add', 'a'),
    edge('sc-e3', 'sc-add', 'result', 'sc-write', 'score'),
  ],
};

export async function scope(t) {
  const { check, sleep, json, shot, click, locate, asset, mutate, stop, has } = t;

  const selectAsset = async (id) => {
    await t.select({ kind: 'asset', assetId: id });
  };
  const selectNode = async (nodeId) => {
    await t.select({ kind: 'node', assetId: 'sc-logic', nodeId });
  };
  /** The inspector is drawn over the graph, so the last match is the row rather than a port. */
  const clickLast = async (text) => {
    const p = await locate(text, true);
    await click(p.x, p.y);
  };

  // 32a. A Variables asset, a behavior counting on it, and two boxes wearing that behavior.
  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: 'sc-logic',
      name: 'Counter',
      props: { enabled: true, runInEditor: false },
      variables: [],
      graph: ${JSON.stringify(counterGraph)},
    });
    p.assets.unshift(a, {
      id: 'sc-vars',
      type: 'variables',
      name: 'Score',
      props: { score: 0 },
      variables: ${JSON.stringify([variable('score', 'number', 0)])},
    });
    ${MAKE_OBJECT}
    scene.objects.push(
      make('sc-box-a', 'crate', '', 1500, 'Counter box A'),
      make('sc-brain-a', 'sc-logic', 'sc-box-a', 0, 'Counter A'),
      make('sc-box-b', 'crate', '', 1700, 'Counter box B'),
      make('sc-brain-b', 'sc-logic', 'sc-box-b', 0, 'Counter B'),
    );
  `);

  // 32b. The run: two instances, one number. A per-instance variable would stand at 1.
  await t.play();
  await sleep(600);
  const world = await json('__gm.world()');
  const carriers = world.entities.filter((e) => e.props && 'score' in e.props).map((e) => e.name);
  const shared = world.shared.variables['sc-vars'];
  check(
    'two behavior instances count into one shared variable',
    shared && shared.score === 2,
    `score = ${JSON.stringify(shared && shared.score)} after both started – 1 would mean each kept its own`,
  );
  check(
    'and the value belongs to the run, not to either placed object',
    carriers.length === 0,
    `objects carrying "score": ${JSON.stringify(carriers)}`,
  );
  await stop();

  // 32c. The asset is where the declaration lives, and it says what it is for.
  await selectAsset('sc-vars');
  const declared = await has('score');
  const explains = await has('Every graph pointing here shares them.');
  check(
    'the Variables asset lists its declarations and says what they are',
    declared && explains,
    `row: ${declared}, note: ${explains}`,
  );
  await shot('01-variables-asset');

  // 32d. The node picks its ports from the asset it names – the whole point of naming one.
  await selectNode('sc-read');
  const offersShared = await has('score');
  const complains = await has('"score" is not a variable of this behavior.');
  check(
    'a node naming the asset offers its variables instead of the behavior’s',
    offersShared && !complains,
    `row: ${offersShared}, warning shown: ${complains}`,
  );
  await shot('02-node-source');

  // Emptying the setting points the node back at the behavior, which declares nothing – so the
  // very same port is now a stranger. That is the switch doing something visible.
  await mutate(`
    const g = __gm.state.project.assets.find((a) => a.id === 'sc-logic').graph;
    g.nodes.find((n) => n.id === 'sc-read').params.variablesAsset = '';
  `);
  const complainsNow = await has('"score" is not a variable of this behavior.');
  check(
    'and clearing it points the node back at the behavior, which has no such variable',
    complainsNow,
    `warning after clearing: ${complainsNow}`,
  );

  // 32e. A machine carries its scope on the asset too, with its own switch.
  await mutate(`
    const p = __gm.state.project;
    p.assets.unshift({
      id: 'sc-machine',
      type: 'statemachine',
      name: 'Shared doors',
      props: {},
      graph: { nodes: [], edges: [] },
    });
  `);
  await selectAsset('sc-machine');
  const machineScope = await has('Local');
  const pick = await locate('Local', true);
  await click(pick.x, pick.y);
  await clickLast('Global');
  const machine = await asset('sc-machine');
  check(
    'a state machine is switched between one current state per object and one for the run',
    machineScope && machine.scope === 'global',
    `dropdown found: ${machineScope}, scope now ${JSON.stringify(machine.scope)}`,
  );
  await shot('03-machine-scope');

  // 32f. Everything this step added goes again.
  await mutate(`
    const p = __gm.state.project;
    const scene = __gm.state.activeScene;
    scene.objects = scene.objects.filter((o) => !o.id.startsWith('sc-'));
    p.assets = p.assets.filter((a) => !a.id.startsWith('sc-'));
    __gm.state.select(null);
  `);
}