/**
 * The behavior graph editor: binding to the selection, dragging nodes, the palette (row click
 * and Enter), connecting ports, deleting, the live highlight while playing, variables.
 */
export async function graph(t) {
  const {
    check,
    sleep,
    evaluate,
    json,
    shot,
    click,
    clickText,
    drag,
    locate,
    typeText,
    press,
    holdKey,
    undo,
    state,
    select,
    stop,
    asset,
  } = t;
  const nodeOf = async (id) => (await asset('mover')).graph.nodes.find((n) => n.id === id);
  const graphCounts = async () => {
    const g = (await asset('mover')).graph;
    return { nodes: g.nodes.length, edges: g.edges.length };
  };
  const variableKeys = async () => (await asset('mover')).variables.map((v) => v.key).join(',');

  // 13. Selecting the Mover asset binds the graph; the Graph tab shows it.
  await clickText('Mover');
  await evaluate(`__gm.showTab('graph')`);
  await sleep(250);
  check(
    'graph editor shows the selected behavior',
    (await evaluate(`__gm.graph.current()`)) === 'mover' && (await evaluate('__gm.tab()')) === 'graph',
  );
  await shot('16-graph');

  // 13a. Drag a node: clicking its title selects it, dragging moves it (undoable).
  const axisBefore = await nodeOf('n-axis');
  const axisPos = await json(`__gm.graph.nodeAt('n-axis')`);
  await drag(axisPos.x, axisPos.y, axisPos.x + 60, axisPos.y + 40);
  let s = await state();
  const axisAfter = await nodeOf('n-axis');
  check(
    'dragging a node selects and moves it',
    s.selection?.kind === 'node' &&
      s.selection.nodeId === 'n-axis' &&
      axisAfter.x === axisBefore.x + 60 &&
      axisAfter.y === axisBefore.y + 40,
    `${JSON.stringify(s.selection)} ${axisBefore.x},${axisBefore.y} → ${axisAfter.x},${axisAfter.y}`,
  );
  check(
    'node inspector shows the node',
    Boolean(await evaluate(`__gm.locate('Axis input')`)) &&
      Boolean(await evaluate(`__gm.locate('DATA NODE')`)),
  );
  await undo();
  const axisUndone = await nodeOf('n-axis');
  check(
    'undo moves the node back',
    axisUndone.x === axisBefore.x && axisUndone.y === axisBefore.y,
    `${axisUndone.x},${axisUndone.y}`,
  );

  // 13b. Regression: typing a query and then *clicking* a row must add exactly one node.
  //      (The search field's blur-commit once picked the first match and the row click picked
  //      it again → two nodes.)
  const gcenter = await json('__gm.graph.center()');
  const beforeClickPick = await graphCounts();
  await click(gcenter.x + 250, gcenter.y + 250, 'right');
  await sleep(100);
  check('node palette opens (row-click case)', Boolean(await evaluate(`__gm.locate('Search nodes…')`)));
  await typeText('stop');
  await sleep(150);
  const stopRow = await locate('Stop game'); // nothing else on screen shows this label
  await click(stopRow.x, stopRow.y);
  await sleep(100);
  const afterClickPick = await graphCounts();
  check(
    'clicking a palette row adds exactly one node',
    afterClickPick.nodes === beforeClickPick.nodes + 1,
    JSON.stringify({ beforeClickPick, afterClickPick }),
  );
  check('palette closed after row click', !(await evaluate(`__gm.locate('Search nodes…')`)));
  await undo(); // so the next step finds the same empty spot and the expected graph
  check('undo removes the clicked node again', (await graphCounts()).nodes === beforeClickPick.nodes);

  // 13c. Right-click the empty canvas → palette → search "log" → Enter adds a Log node.
  const before13 = await graphCounts();
  await click(gcenter.x + 250, gcenter.y + 250, 'right');
  await sleep(100);
  check('node palette opens', Boolean(await evaluate(`__gm.locate('Search nodes…')`)));
  await typeText('log');
  await sleep(100);
  await press('Enter');
  await sleep(250);
  const after13 = await graphCounts();
  s = await state();
  const newNode = s.selection?.kind === 'node' ? await nodeOf(s.selection.nodeId) : null;
  check(
    'palette adds a Log node and selects it',
    after13.nodes === before13.nodes + 1 && newNode?.type === 'Log',
    JSON.stringify({ after13, newNode }),
  );
  await shot('17-node-added');

  // 13d. Connect: drag from the Move node's exec output onto the Log node's exec input. An
  //      exec output must not connect to a data input: dragging onto "message" does nothing.
  const fromPort = await json(`__gm.graph.portAt('n-move', 'exec', true)`);
  const toPort = await json(`__gm.graph.portAt(${JSON.stringify(newNode.id)}, 'exec', false)`);
  await drag(fromPort.x, fromPort.y, toPort.x, toPort.y, 16);
  const connected = await graphCounts();
  check(
    'dragging port to port connects the nodes',
    connected.edges === before13.edges + 1,
    JSON.stringify(connected),
  );
  const dataPort = await json(`__gm.graph.portAt(${JSON.stringify(newNode.id)}, 'message', false)`);
  await drag(fromPort.x, fromPort.y, dataPort.x, dataPort.y, 16);
  check(
    'incompatible ports are rejected',
    (await graphCounts()).edges === before13.edges + 1 && s.mode === 'edit',
  );
  await shot('18-connected');

  // 13e. Delete removes the selected node together with its edge; undo brings both back.
  await select({ kind: 'node', assetId: 'mover', nodeId: newNode.id });
  await press('Delete');
  await sleep(150);
  const deleted = await graphCounts();
  check(
    'Delete removes the node and its edge',
    deleted.nodes === before13.nodes && deleted.edges === before13.edges,
    JSON.stringify(deleted),
  );
  await undo();
  const restored = await graphCounts();
  check(
    'undo restores node and edge',
    restored.nodes === before13.nodes + 1 && restored.edges === before13.edges + 1,
    JSON.stringify(restored),
  );

  // 13f. The fps readout runs in both modes. Play always starts on the Game tab; switching to
  //      Graph while playing shows the live highlight: hold ArrowRight → the exec edge is hot.
  const fpsEdit = await evaluate('__gm.fps()');
  check('fps readout is measured in edit mode', typeof fpsEdit === 'number' && fpsEdit > 0, `fps=${fpsEdit}`);
  // Single evaluate: the readout refreshes twice a second, so read value and label together.
  check(
    'fps label is visible in the toolbar',
    (await evaluate(`!!__gm.locate(__gm.fps() + ' fps')`)) === true,
  );
  await t.play();
  check('play switches to the game tab', (await evaluate('__gm.tab()')) === 'game');
  await sleep(600);
  const fpsPlay = await evaluate('__gm.fps()');
  check(
    'fps readout keeps running in play mode',
    typeof fpsPlay === 'number' && fpsPlay > 0,
    `fps=${fpsPlay}`,
  );
  await evaluate(`__gm.showTab('graph')`);
  await sleep(100);
  const holding = holdKey('ArrowRight', 300);
  await sleep(250);
  await shot('19-graph-live');
  await holding;
  await stop();

  // 13g. Variables: the "+ Variable" dropdown → Number adds "var1" with default 0; undo removes it.
  await select({ kind: 'asset', assetId: 'mover' });
  await sleep(150);
  await clickText('+ Variable');
  await clickText('Number');
  await sleep(100);
  check(
    'adding a variable declares it on the behavior',
    (await variableKeys()) === 'speed,var1',
    await variableKeys(),
  );
  await shot('20-variable-added');
  await undo();
  check('undo removes the variable', (await variableKeys()) === 'speed', await variableKeys());

  // 13h. The tab keeps its subject: selecting something else leaves the graph alone, and the
  //      header picker switches behaviors without any selection at all.
  const size = await graphCounts();
  const readout = `${size.nodes} nodes · ${size.edges} links`;
  check(
    'the header reports the size of the shown graph',
    Boolean(await evaluate(`__gm.locate(${JSON.stringify(readout)})`)),
    readout,
  );
  await select(null);
  await sleep(100);
  check(
    'graph editor keeps its behavior when nothing is selected',
    (await evaluate(`__gm.graph.current()`)) === 'mover',
  );
  await select({ kind: 'asset', assetId: 'cam' });
  await sleep(100);
  check(
    'graph editor keeps its behavior for a non-behavior asset',
    (await evaluate(`__gm.graph.current()`)) === 'mover',
  );
  // The picker is the *last* "Mover" on screen: the assets panel shows one too.
  const pickerAt = await locate('Mover', true);
  await click(pickerAt.x, pickerAt.y);
  await sleep(150);
  const spawnerRow = await locate('Spawner', true);
  await click(spawnerRow.x, spawnerRow.y);
  await sleep(200);
  check(
    'the header picker switches the graph to another behavior',
    (await evaluate(`__gm.graph.current()`)) === 'spawner',
    String(await evaluate(`__gm.graph.current()`)),
  );
  await select({ kind: 'asset', assetId: 'mover' });
  await sleep(100);
  check(
    'graph editor rebinds when a behavior is selected again',
    (await evaluate(`__gm.graph.current()`)) === 'mover',
  );
  await evaluate(`__gm.showTab('scene')`);
}