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

/**
 * The Variables node: its ports are the behavior's variables, each read at any time and written
 * where it is switched to Set. The step checks the run, picking a port from the variable list,
 * switching Set, 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 → Variables{set 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', 'Variables', 260, 0, { vx: 2, vy: 3 }, [written('vx', 'number'), written('vy', 'number')]),
    node('vp-get', 'Variables', 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, json, shot, click, locate, undo, entity, asset, mutate, stop, typeText, press, has } =
    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 t.select({ kind: 'node', assetId: 'vp-logic', nodeId, nodeIds: [nodeId] });
  };
  /** 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);
  };
  /** The Set checkbox of the newest variable row: the control right of the last "Set" label. */
  const clickLastSet = async () => {
    const box = await json(`__gm.inspectorField('Set', true)`);
    await click(box.x, box.y);
    return box;
  };

  // 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'));
  `);

  // 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();
  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();

  // 23c. Every variable is an output; a written one is an input too, and only a writing node has
  //      flow pins.
  await select('vp-set');
  const pins = {
    setIn: Boolean(await portAt('vp-set', 'vx', false)),
    setOut: Boolean(await portAt('vp-set', 'vx', true)),
    getOut: Boolean(await portAt('vp-get', 'vx', true)),
    getIn: Boolean(await portAt('vp-get', 'vx', false)),
    getFlow: Boolean(await portAt('vp-get', 'exec', false)),
  };
  check(
    'a written variable is an input and an output, a read one only an output, without flow pins',
    pins.setIn && pins.setOut && pins.getOut && !pins.getIn && !pins.getFlow,
    JSON.stringify(pins),
  );

  // 23d. The inspector picks a port from the behavior's variables instead of having it typed, and
  //      a picked one is read until it is switched to Set.
  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 clickLast('vz');
  const grown = await portsOf('vp-set');
  check(
    'picking one adds it as a read port, typed from the variable',
    grown.length === 3 && grown[2].key === 'vz' && grown[2].kind === 'number' && !grown[2].write,
    JSON.stringify(grown),
  );
  check(
    'and the node grew that output only',
    Boolean(await portAt('vp-set', 'vz', true)) && !(await portAt('vp-set', 'vz', false)),
  );
  await clickLastSet();
  check(
    'switching it to Set gives it an input as well',
    (await portsOf('vp-set'))[2]?.write === true && Boolean(await portAt('vp-set', 'vz', false)),
    JSON.stringify(await portsOf('vp-set')),
  );
  const drawn = await json(`__gm.graph.nodeInputs('vp-set')`);
  check(
    'with nothing typed the node shows the value it writes beside the name, as the inspector does',
    drawn?.includes('vz  0') && drawn.includes('vx  2'),
    JSON.stringify(drawn),
  );
  await shot('02-variable-set');
  await undo();
  await undo();
  check('undo takes both 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 clickLast('vz');
  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();
  check('and undo points it back', (await portsOf('vp-get'))[0].key === 'vx');

  // 23f. Collapsed, the ports are out of sight, so the title says what the node does – and only then.
  const titleOf = (id) => json(`__gm.graph.nodeLabel(${JSON.stringify(id)})`);
  const toggle = async (id) => {
    const chevron = await json(`__gm.graph.chevronAt(${JSON.stringify(id)})`);
    await click(chevron.x, chevron.y);
  };
  /** `locate` matches exactly, so a title cut short by a too-narrow node is not found. */
  const drawnWhole = async (text) => {
    const canvas = await json('__gm.graph.canvasRect()');
    const hits = await json(`__gm.locateAll(${JSON.stringify(text)})`);
    return hits.some((p) => p.x > canvas.x && p.x < canvas.x + canvas.w);
  };
  await toggle('vp-set');
  await toggle('vp-get');
  const shut = { set: await titleOf('vp-set'), get: await titleOf('vp-get') };
  check(
    'collapsed, a node writing two variables says so, and one only reading two says that',
    shut.set === 'Set 2 variables' &&
      shut.get === 'Get 2 variables' &&
      (await drawnWhole('Set 2 variables')) &&
      (await drawnWhole('Get 2 variables')),
    JSON.stringify(shut),
  );
  await shot('02b-collapsed-titles');
  const narrow = (await json(`__gm.graph.nodeRect('vp-get')`)).w;
  await clickLastSet();
  const switched = await titleOf('vp-get');
  check(
    'switching one to Set while collapsed retitles it and resizes it to the new title',
    switched === 'Set vy' &&
      (await drawnWhole('Set vy')) &&
      (await json(`__gm.graph.nodeRect('vp-get')`)).w < narrow,
    JSON.stringify({ switched, narrow }),
  );
  await undo();
  await toggle('vp-set');
  await toggle('vp-get');
  const open = [await titleOf('vp-set'), await titleOf('vp-get')];
  check(
    'expanded again, both are plain Variables nodes',
    open.join() === 'Variables,Variables',
    JSON.stringify(open),
  );

  // 23g. 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: [] }, [
          { key: 'shape', kind: 'number' },
          { key: 'tint', kind: 'color' },
          { key: 'cells', kind: 'list' },
        ]),
      )},
      ${JSON.stringify(variable('shapes', 'list', [{ x: 0, y: 0 }]))},
    );
    a.props.piece = { shape: 0, tint: 0, cells: [] };
    a.props.shapes = [{ x: 0, y: 0 }];
    a.graph.nodes.push(${JSON.stringify(node('vp-pack', 'PackStruct', 560, 400))});
  `);

  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 shot('03-from-variable');
  await clickLast('piece');
  const seeded = await portsOf('vp-pack');
  check(
    'picking a struct variable declares every field at once, each of its own kind',
    JSON.stringify(seeded) ===
      '[{"key":"shape","kind":"number"},{"key":"tint","kind":"color"},{"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();
  check('one undo takes all of them back', (await portsOf('vp-pack')).length === 0);

  // 23h. A list declares nothing, so the shape comes off the struct items in it – the bundle a Pack
  //      builds for such a list.
  await click(from.x, from.y);
  await clickLast('shapes (item)');
  const fromItem = await portsOf('vp-pack');
  check(
    'a list offers the shape of the struct items it holds',
    fromItem.map((p) => p.key).join(',') === 'x,y',
    JSON.stringify(fromItem),
  );
  await undo();

  // 23i. 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 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),
  );

  // 23j. From the palette the node comes empty; picking a variable keeps its title, and switched to Set
  //      it runs `vz = vz + 1` once a frame – its own output feeding its input via Add.
  const nodeIds = async () => (await asset('vp-logic')).graph.nodes.map((n) => n.id);
  const idsBefore = await nodeIds();
  // Bare canvas below every node, so the click cannot land on the Pack.
  const bareSpot = await json('__gm.graph.emptySpot()');
  await click(bareSpot.x, bareSpot.y, 'right');
  // Enter takes the first hit in category order, so search by a phrase only its description has.
  await typeText('switched to Set');
  await press('Enter');
  const added = (await asset('vp-logic')).graph.nodes.find((n) => !idsBefore.includes(n.id));
  check('the palette offers the Variables node', added?.type === 'Variables', JSON.stringify(added));
  const variableId = added?.id ?? '';
  const untitled = await titleOf(variableId);
  const bare = !(await portAt(variableId, 'exec', false));
  await clickLast('+ Variable');
  await clickLast('vz');
  await clickLastSet();
  check(
    'it starts without pins, and picking its variable leaves the title Variables',
    untitled === 'Variables' && bare && (await titleOf(variableId)) === 'Variables',
    JSON.stringify({ untitled, bare, titled: await titleOf(variableId) }),
  );
  check('switched to Set it grows its flow pins', Boolean(await portAt(variableId, 'exec', false)));
  await shot('05-variable-node');

  await mutate(`
    const g = __gm.state.project.assets.find((x) => x.id === 'vp-logic').graph;
    g.nodes.push(
      ${JSON.stringify(node('vp-add', 'Add', 800, 200, { b: 1 }))},
      ${JSON.stringify(node('vp-gone', 'Variables', 800, 500, {}, [port('gone', 'number')]))},
    );
    g.edges.push(
      ${JSON.stringify(edge('vp-e7', 'vp-move', 'exec', variableId, 'exec'))},
      ${JSON.stringify(edge('vp-e8', variableId, 'vz', 'vp-add', 'a'))},
      ${JSON.stringify(edge('vp-e9', 'vp-add', 'result', variableId, 'vz'))},
    );
  `);
  await select('vp-gone');
  check(
    'a port naming a variable the behavior does not have is marked in the inspector',
    await has('"gone" is not a variable of this behavior.'),
  );

  await t.play();
  await sleep(1000);
  const counted = (await entity('vp-brain'))?.props.vz;
  await stop();
  check(
    'in the run it reads through its own output and writes the sum back, so vz climbs',
    typeof counted === 'number' && counted > 20,
    `vz = ${counted} after ~1 s`,
  );

  // 23k. An object variable: declared from the menu like any other, but with nothing to type – it is
  //      set by a graph while the game runs, so the row says (null) and the file keeps only the
  //      empty object's place.
  await t.select({ kind: 'asset', assetId: 'vp-logic' });
  await clickLast('+ Variable');
  await clickLast('Object');
  const declared = (await asset('vp-logic')).variables.at(-1);
  check(
    'an Object variable is declared from the menu and stores nothing as its value',
    declared?.kind === 'object' && declared.default?.$object === '' && (await has('(null)')),
    JSON.stringify(declared),
  );
  await shot('06-object-variable');
  await undo();
  check(
    'undo takes it back',
    (await asset('vp-logic')).variables.every((v) => v.kind !== 'object'),
  );

  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();
  `);
  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));
}