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

/**
 * Scopes: a variable or a state machine declared `global` keeps one value for the whole run instead
 * of one per behavior instance. The step checks the run (two objects counting into one number), the
 * switch in the inspector, and that a global variable stops being a property of the placed object.
 *
 * The step brings its own boxes, behavior and machine; everything it adds is removed at the end.
 */

/** `On start → Variables{set score} ← Add(score, 1)`: every instance adds one to the same number. */
const counterGraph = {
  nodes: [
    node('sc-start', 'OnStart', 0, 0),
    node('sc-read', 'Variables', 0, 200, {}, [port('score', 'number')]),
    node('sc-add', 'Add', 260, 200, { b: 1 }),
    node('sc-write', 'Variables', 560, 0, {}, [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'),
  ],
};

const globalScore = { ...variable('score', 'number', 0), scope: 'global' };

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

  const selectAsset = async (id) => {
    await evaluate(`__gm.state.select({ kind: 'asset', assetId: ${JSON.stringify(id)} })`);
    await sleep(300);
  };
  const selectObject = async (id) => {
    await evaluate(
      `__gm.state.select({ kind: 'object', holderId: __gm.state.activeScene.id, objectId: ${JSON.stringify(id)} })`,
    );
    await sleep(300);
  };
  /** 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);
    await sleep(250);
  };
  const scopeOfVariable = async () => (await asset('sc-logic')).variables[0].scope ?? 'local';

  // 32a. Two boxes wearing one behavior whose `score` is global.
  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, score: 0 },
      variables: ${JSON.stringify([globalScore])},
      graph: ${JSON.stringify(counterGraph)},
    });
    p.assets.unshift(a);
    ${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'),
    );
  `);
  await sleep(400);

  // 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);
  check(
    'two behavior instances count into one global variable',
    world.shared.variables.score === 2,
    `score = ${JSON.stringify(world.shared.variables.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();
  await sleep(400);

  // 32c. A global variable shows no row on the object placed from the behavior – overriding one
  //      value of something every object shares would mean nothing.
  await selectObject('sc-brain-a');
  const rowWhileGlobal = await has('score');
  const saysWhereItWent = await has('Shared by the whole run: score.');
  check(
    'the object names the variable it no longer holds, instead of claiming there is none',
    saysWhereItWent && !(await has('The behavior declares no variables.')),
    `note found: ${saysWhereItWent}`,
  );
  await shot('01-object-without-global');

  // 32d. The switch sits on the declaration, in the behavior's own inspector.
  await selectAsset('sc-logic');
  const picker = await locate('⊕');
  check(
    'a global variable is marked as shared where it is declared',
    Boolean(picker),
    JSON.stringify(picker),
  );
  await shot('02-declaration');
  await click(picker.x, picker.y);
  await sleep(250);
  await clickLast('Local – one value per object');
  await sleep(350);
  check(
    'and the menu switches it back to one value per object',
    (await scopeOfVariable()) === 'local',
    `scope is now ${await scopeOfVariable()}`,
  );

  await selectObject('sc-brain-a');
  const rowWhileLocal = await has('score');
  check(
    'the row appears on the placed object exactly while the variable is local',
    !rowWhileGlobal && rowWhileLocal,
    `global: ${rowWhileGlobal}, local: ${rowWhileLocal}`,
  );

  // 32e. A machine carries the same switch, and its own inspector is where it lives.
  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 sleep(250);
  await clickLast('Global – one current state for the whole run');
  await sleep(350);
  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);
  `);
  await sleep(300);
}