/**
 * W5.8 — Playwright e2e for the 3 NEW Wave-5 thressgame-100 economy
 * recipes shipped by W5.7 (`recipes.ts` lines 2904-3032).
 *
 * Coverage shape (mirrors `wave4-topology-pairing.spec.ts`, scaled to
 * the Wave-5 batch):
 *
 *   1. Three LOAD-AND-VALIDATE tests — one per recipe id. Same pattern
 *      as the prior wave specs: open the Custom Modifier Editor →
 *      click Templates → click the recipe's row →
 *      assert the modal closes, the descriptor name matches, and the
 *      validation footer reports "Valid Custom Descriptor".
 *
 *   2. Two RUNTIME-BEHAVIOR tests:
 *
 *        Batch M-A — `tpl-summoning-ritual` (full runtime, success path):
 *          Pre-seed `WhiteScore = 15` by applying a mini-descriptor
 *          containing a single top-level `add-resource(white, 15)`.
 *          `__test__.apply-descriptor` bypasses the validator's
 *          imperative-in-passive gate (per W1.11 learnings) so the
 *          top-level imperative applies cleanly via `applyCustomDescriptor`'s
 *          walker. The walker has no childPrimitives to recurse for
 *          `add-resource`, so it fires exactly once → WhiteScore=15.
 *
 *          Then apply the real `tpl-summoning-ritual` recipe. Its
 *          activation arm contains `on-rule-activated → spend-resource(...)`.
 *          The walker recurses into `on-rule-activated.childPrimitives()`
 *          (selfRecurse !== true), reaching `spend-resource` — which has
 *          `selfRecurse: true`, so the walker calls its `apply()` ONCE
 *          and stops. Then `fireOnRuleActivatedHooks` fires the arm a
 *          SECOND time (the documented W1.11 walker-double-fire
 *          artifact). Net effect: spend-resource runs twice, each spending
 *          5 → WhiteScore = 15 - 5 - 5 = 5. The `then` arm's
 *          `place-piece(knight, white, sq=28)` also runs twice, but
 *          place-piece writes Position to a fresh entity each call and
 *          the renderer dedupes by square, so the DOM shows ONE white
 *          knight at e4.
 *
 *          Assertions: score chip visible with text containing "5";
 *          a white knight rendered at e4; engine WhiteScore === 5.
 *
 *        Batch M-B — `tpl-cash-grab` (full runtime, turn-end driven):
 *          Activate the recipe (no pre-seed). The activation arm is
 *          `on-turn-end(both) → add-resource(white,1) + add-resource(black,1)`.
 *          The walker recurses into on-turn-end's children and fires
 *          BOTH add-resource primitives once — so post-apply scores are
 *          white=1, black=1.
 *
 *          Drive 2 plies (1 white move + 1 black move). Each ply ends
 *          a turn → fires `OnTurnEndHooks` → +1 to each player. Final
 *          scores: white=3, black=3.
 *
 *          Assertions: score chips visible with non-zero text values
 *          BOTH after activation (1/1) AND after 2 plies (3/3).
 *
 * ─────────────────────────────────────────────────────────────────────
 * Driving infrastructure
 * ─────────────────────────────────────────────────────────────────────
 *
 * Per the precedent set by all prior wave specs, e2e helpers are
 * duplicated rather than extracted into a shared module — Playwright's
 * worker model loads each spec in isolation and `e2e/` is in `testMatch`
 * so a shared module under `e2e/` would itself be treated as a test file.
 *
 * Helper script:
 *   `.sisyphus/scripts/run-pw.sh /tmp/<log> <spec> <args>` (NEVER
 *   set CI=true — it flips reuseExistingServer:false and collides
 *   with the docker compose dev stack on :5173 / :7357).
 */

import { test, expect, type Browser, type Page } from '@playwright/test';
import { spawn, type ChildProcess } from 'node:child_process';
import { setTimeout as sleep } from 'node:timers/promises';

// ---------------------------------------------------------------------------
// LocalStorage / SessionStorage hygiene keys (mirror prior wave specs)
// ---------------------------------------------------------------------------

const PROFILE_LIBRARY_KEY = 'houserules:modifier-profiles:v1';
const CUSTOM_LIBRARY_KEY = 'houserules:custom-modifiers:v1';

// ---------------------------------------------------------------------------
// The 3 new W5 recipe ids + canonical descriptor.name strings (sourced
// from recipes.ts lines 2921-3032). Pinned constants — must stay in sync
// with `descriptorForRecipe(id, name, ...)` in recipes.ts.
// ---------------------------------------------------------------------------

const NEW_RECIPE_IDS = [
  'tpl-treasure-chest',
  'tpl-cash-grab',
  'tpl-summoning-ritual',
] as const;

type NewRecipeId = (typeof NEW_RECIPE_IDS)[number];

const RECIPE_NAMES: Record<NewRecipeId, string> = {
  'tpl-treasure-chest': 'Treasure Chest',
  'tpl-cash-grab': 'Cash Grab',
  'tpl-summoning-ritual': 'Summoning Ritual',
};

// ---------------------------------------------------------------------------
// Inline copies of the 2 runtime-tested descriptors. Hard-coded so the
// spec doesn't need to import from chess source (the e2e runner doesn't
// bundle TS). Drift surfaces as a name-mismatch in load-and-validate.
//
// MUST stay in sync with `packages/chess/src/modifiers/custom/recipes.ts`:
//   - tpl-cash-grab          (lines 2966-2994)
//   - tpl-summoning-ritual   (lines 2995-3031)
// ---------------------------------------------------------------------------

const CASH_GRAB_DESCRIPTOR = {
  type: 'data',
  id: 'tpl-cash-grab',
  name: 'Cash Grab',
  description:
    'At every turn end, both players gain +1 score. Simplified passive-income demo of on-turn-end → add-resource (the random-pick-and-compare canonical shape is blocked by the missing `eq` resolver).',
  version: 1,
  primitives: [
    {
      kind: 'on-turn-end',
      params: {
        color: 'both',
        primitives: [
          {
            kind: 'add-resource',
            params: { player: 'white', amount: 1 },
          },
          {
            kind: 'add-resource',
            params: { player: 'black', amount: 1 },
          },
        ],
      },
    },
  ],
  targetAttrs: [],
  uiForm: 'primitive-composer',
  source: 'custom',
} as const;

const SUMMONING_RITUAL_DESCRIPTOR = {
  type: 'data',
  id: 'tpl-summoning-ritual',
  name: 'Summoning Ritual',
  description:
    'Pay 5 score (from WhiteScore) to summon a white knight at e4. Single-shot on rule activation: spend-resource(white, 5, then=[place-piece(knight, white, 28)]).',
  version: 1,
  primitives: [
    {
      kind: 'on-rule-activated',
      params: {
        primitives: [
          {
            kind: 'spend-resource',
            params: {
              player: 'white',
              amount: 5,
              then: [
                {
                  kind: 'place-piece',
                  params: {
                    pieceType: 'knight',
                    color: 'white',
                    square: 28,
                  },
                },
              ],
            },
          },
        ],
      },
    },
  ],
  targetAttrs: [],
  uiForm: 'primitive-composer',
  source: 'custom',
} as const;

/**
 * Mini-descriptor used to pre-seed `WhiteScore = 15` before applying
 * `tpl-summoning-ritual`. A single top-level `add-resource` would
 * normally fail the validator's `descriptor.primitives.imperative-in-passive`
 * gate, but `__test__.apply-descriptor` bypasses validation (W1.11
 * learnings § "Imperative-in-passive validator gate is bypassed on
 * apply-descriptor"). The walker fires `add-resource` exactly once
 * (no childPrimitives, no on-rule-activated double-fire path).
 *
 * 15 (rather than 10) is chosen because the summoning ritual's
 * spend-resource fires TWICE through the walker-double-fire artifact
 * (walker descent + fireOnRuleActivatedHooks), each spending 5. So
 * 15 - 5 - 5 = 5 — the locked target value asserted in the test.
 */
const SEED_WHITE_SCORE_15_DESCRIPTOR = {
  type: 'data',
  id: 'test-seed-white-score-15',
  name: 'Seed White Score 15',
  description: 'Test fixture — pre-seeds WhiteScore=15 via top-level add-resource.',
  version: 1,
  primitives: [
    {
      kind: 'add-resource',
      params: { player: 'white', amount: 15 },
    },
  ],
  targetAttrs: [],
  uiForm: 'primitive-composer',
  source: 'custom',
} as const;

// ---------------------------------------------------------------------------
// Server lifecycle (mirrors wave4-topology-pairing.spec.ts)
// ---------------------------------------------------------------------------

let wsServerProcess: ChildProcess | null = null;

async function isWsServerRunning(): Promise<boolean> {
  try {
    const res = await fetch('http://localhost:7357/healthz');
    return res.ok;
  } catch {
    return false;
  }
}

test.beforeAll(async () => {
  if (await isWsServerRunning()) return;
  wsServerProcess = spawn('bun', ['run', 'packages/server/src/index.ts'], {
    stdio: 'pipe',
    env: { ...process.env, PORT: '7357' },
  });
  for (let i = 0; i < 40; i++) {
    await sleep(250);
    if (await isWsServerRunning()) break;
  }
});

test.afterAll(async () => {
  if (wsServerProcess) {
    wsServerProcess.kill('SIGINT');
    await sleep(200);
    wsServerProcess = null;
  }
});

// ---------------------------------------------------------------------------
// LOAD-PATH helpers (lobby → profile editor → custom-modifier editor).
// Mirrors wave4-topology-pairing.spec.ts.
// ---------------------------------------------------------------------------

async function freshLobby(page: Page): Promise<void> {
  await page.goto('/');
  await page.evaluate(
    ({ profileKey, customKey }) => {
      localStorage.removeItem(profileKey);
      localStorage.removeItem(customKey);
      sessionStorage.removeItem('room-code');
      sessionStorage.removeItem('room-token');
      sessionStorage.removeItem('player-color');
      sessionStorage.removeItem('layout-name');
      sessionStorage.removeItem('modifier-profile-name');
    },
    { profileKey: PROFILE_LIBRARY_KEY, customKey: CUSTOM_LIBRARY_KEY },
  );
  await page.reload();
}

async function openProfileEditor(page: Page): Promise<void> {
  const picker = page.getByTestId('profile-picker');
  await expect(picker).toBeVisible();
  await picker.selectOption('custom');
  await expect(
    page
      .getByTestId('per-type-panel-paste')
      .or(page.locator('[role="dialog"], .fixed.inset-0').first()),
  ).toBeVisible({ timeout: 3000 });
}

async function openCustomModifierEditor(page: Page): Promise<void> {
  await page.getByTestId('open-custom-modifier-editor').click();
  await expect(page.getByTestId('custom-modifier-editor')).toBeVisible({
    timeout: 3000,
  });
}

// ---------------------------------------------------------------------------
// RUNTIME-PATH helpers (raw WS room creation + apply-descriptor + sendMove).
// Mirrors wave4-topology-pairing.spec.ts + parity-rules.spec.ts.
// ---------------------------------------------------------------------------

async function wsCreateRoom(
  page: Page,
): Promise<{ code: string; token: string; color: string }> {
  return page.evaluate(async () => {
    return new Promise<{ code: string; token: string; color: string }>(
      (resolve, reject) => {
        const ws = new WebSocket('ws://localhost:7357/ws');
        const timer = setTimeout(
          () => reject(new Error('wsCreateRoom: timeout')),
          5000,
        );
        ws.onopen = () => {
          ws.send(
            JSON.stringify({
              v: 1,
              seq: 1,
              ts: Date.now(),
              type: 'room.create',
              payload: {},
            }),
          );
        };
        ws.onmessage = (e: MessageEvent) => {
          const msg = JSON.parse(e.data as string) as {
            type: string;
            payload: {
              code: string;
              token: string;
              color: string;
              message?: string;
            };
          };
          if (msg.type === 'room.created') {
            clearTimeout(timer);
            ws.close();
            resolve(msg.payload);
          } else if (msg.type === 'error') {
            clearTimeout(timer);
            ws.close();
            reject(new Error(msg.payload.message ?? 'room.create error'));
          }
        };
        ws.onerror = () => {
          clearTimeout(timer);
          reject(new Error('wsCreateRoom: WebSocket error'));
        };
      },
    );
  });
}

async function joinAsHost(
  page: Page,
): Promise<{ code: string; token: string; color: string }> {
  await page.goto('http://localhost:5173/');
  await page.waitForSelector('[data-testid="page-home"]');
  const room = await wsCreateRoom(page);
  await page.evaluate((r) => {
    sessionStorage.setItem('room-code', r.code);
    sessionStorage.setItem('room-token', r.token);
    sessionStorage.setItem('player-color', r.color);
  }, room);
  await page.goto('http://localhost:5173/game');
  await expect(page.locator('[data-testid="turn-indicator"]')).toBeVisible();
  await page.waitForFunction(
    () =>
      Boolean(
        (globalThis as { __paratypeChessClient?: unknown })
          .__paratypeChessClient,
      ) &&
      Boolean(
        (globalThis as { __paratypeChessPrediction?: unknown })
          .__paratypeChessPrediction,
      ),
    null,
    { timeout: 5000 },
  );
  return room;
}

/**
 * Drive `__test__.apply-descriptor` through the page's existing GameClient
 * socket. Mirror of parity-rules.spec.ts § applyDescriptor.
 */
async function applyDescriptor(
  page: Page,
  args: { code: string; descriptor: unknown; targetSquare?: number },
): Promise<void> {
  await page.evaluate((a) => {
    const client = (
      globalThis as {
        __paratypeChessClient?: {
          send: (msg: { type: string; payload: unknown }) => void;
        };
      }
    ).__paratypeChessClient;
    if (!client)
      throw new Error('applyDescriptor: __paratypeChessClient not present');
    client.send({
      type: '__test__.apply-descriptor',
      payload: {
        roomCode: a.code,
        descriptor: a.descriptor,
        targetSquare: a.targetSquare,
      },
    });
  }, args);
}

/**
 * Read a session attr via the page's PredictionManager.
 * GAME_ENTITY = 0 (per `schema.ts` § "GAME_ENTITY: EntityId = 0").
 */
async function readGameAttr(
  page: Page,
  attr: string,
  entityId: number = 0,
): Promise<unknown> {
  return page.evaluate(
    (a) => {
      const mgr = (
        globalThis as {
          __paratypeChessPrediction?: {
            getCurrentEngine: () => {
              session: {
                get: (id: unknown, attr: string) => unknown;
              };
            };
          };
        }
      ).__paratypeChessPrediction;
      if (!mgr) throw new Error('readGameAttr: PredictionManager not exposed');
      const engine = mgr.getCurrentEngine();
      return engine.session.get(a.entityId, a.attr);
    },
    { attr, entityId },
  );
}

/**
 * Send `game.move` through the page's connected GameClient.
 * Cribbed from parity-rules.spec.ts § sendMove.
 */
async function sendMove(page: Page, from: string, to: string): Promise<void> {
  await page.evaluate(
    async (a) => {
      type Client = {
        send: (msg: { type: string; payload: unknown }) => void;
        sendMove?: (from: string, to: string) => void;
        readonly isConnected?: boolean;
      };
      const getClient = (): Client | undefined =>
        (globalThis as { __paratypeChessClient?: Client })
          .__paratypeChessClient;
      const deadline = Date.now() + 3000;
      let client = getClient();
      while (Date.now() < deadline) {
        client = getClient();
        if (client && client.isConnected === true) break;
        await new Promise((r) => setTimeout(r, 50));
      }
      if (!client || client.isConnected !== true) {
        throw new Error('sendMove: GameClient never became connected');
      }
      if (typeof client.sendMove === 'function') {
        client.sendMove(a.from, a.to);
        return;
      }
      client.send({
        type: 'game.move',
        payload: { from: a.from, to: a.to },
      });
    },
    { from, to },
  );
}

/**
 * Open a second context as the black guest in the host's room. Returns
 * the guest's page handle. Used by the `tpl-cash-grab` runtime test —
 * the engine enforces turn alternation, so we need a real black peer
 * to drive the second ply that fires the second turn-end.
 */
async function joinAsGuest(
  browser: Browser,
  roomCode: string,
): Promise<{ page: Page; close: () => Promise<void> }> {
  const ctxB = await browser.newContext();
  const pageB = await ctxB.newPage();
  await pageB.goto('http://localhost:5173/');
  await pageB.evaluate((c: string) => {
    const ws = new WebSocket('ws://localhost:7357/ws');
    return new Promise<void>((resolve, reject) => {
      const t = setTimeout(() => reject(new Error('join timeout')), 5000);
      ws.onopen = () =>
        ws.send(
          JSON.stringify({
            v: 1,
            seq: 1,
            ts: Date.now(),
            type: 'room.join',
            payload: { code: c },
          }),
        );
      ws.onmessage = (e: MessageEvent) => {
        const msg = JSON.parse(e.data as string) as {
          type: string;
          payload: { code: string; token: string; color: string };
        };
        if (msg.type === 'room.joined') {
          clearTimeout(t);
          sessionStorage.setItem('room-code', msg.payload.code);
          sessionStorage.setItem('room-token', msg.payload.token);
          sessionStorage.setItem('player-color', msg.payload.color);
          ws.close();
          resolve();
        } else if (msg.type === 'error') {
          clearTimeout(t);
          ws.close();
          reject(new Error('join error'));
        }
      };
      ws.onerror = () => {
        clearTimeout(t);
        reject(new Error('ws error'));
      };
    });
  }, roomCode);
  await pageB.goto('http://localhost:5173/game');
  await expect(pageB.locator('[data-testid="my-color"]')).toContainText(
    'black',
  );
  await pageB.waitForFunction(
    () =>
      Boolean(
        (globalThis as { __paratypeChessClient?: unknown })
          .__paratypeChessClient,
      ),
    null,
    { timeout: 5000 },
  );
  return {
    page: pageB,
    close: async () => {
      await ctxB.close();
    },
  };
}

// ---------------------------------------------------------------------------
// Test suite — 3 load-and-validate + 2 runtime
// ---------------------------------------------------------------------------

test.describe('W5.8 — Wave-5 thressgame-100 economy recipes (3 load + 2 runtime)', () => {
  // ── 3 LOAD-AND-VALIDATE tests ────────────────────────────────────────
  for (const id of NEW_RECIPE_IDS) {
    test(`loads ${id} into the editor without error`, async ({ page }) => {
      const pageErrors: Error[] = [];
      page.on('pageerror', (err) => pageErrors.push(err));

      await freshLobby(page);
      await openProfileEditor(page);
      await openCustomModifierEditor(page);

      // Open the templates modal.
      await page.getByTestId('custom-templates').click();
      await expect(page.getByTestId('custom-templates-modal')).toBeVisible();

      // Click the recipe's row.
      await page.getByTestId(`custom-template-${id}`).click();

      // Modal closes after pick.
      await expect(page.getByTestId('custom-templates-modal')).toHaveCount(0);

      // The descriptor name field reflects the recipe's `descriptor.name`.
      await expect(
        page.locator('input[placeholder="Modifier Name"]'),
      ).toHaveValue(RECIPE_NAMES[id]);

      // Footer reports the descriptor as VALID.
      await expect(page.getByText('Valid Custom Descriptor')).toBeVisible();

      // Page-side runtime check.
      expect(pageErrors).toEqual([]);
    });
  }

  // ── RUNTIME 1 (Batch M-A) — tpl-summoning-ritual (success-path full runtime) ──
  //
  // Pre-seed WhiteScore=15 via mini-descriptor (top-level add-resource;
  // apply-descriptor bypasses validator). The walker fires it once →
  // WhiteScore=15.
  //
  // Then apply tpl-summoning-ritual. The walker recurses into
  // on-rule-activated.childPrimitives() and reaches spend-resource
  // (selfRecurse=true → walker calls apply ONCE and stops).
  // fireOnRuleActivatedHooks then fires the arm AGAIN (the documented
  // W1.11 walker-double-fire artifact for trigger primitives).
  //
  // Net: spend-resource fires twice, each spending 5 → WhiteScore =
  // 15 - 5 - 5 = 5. place-piece(knight, white, 28) also fires twice
  // but place-piece writes Position to a fresh entity each call and
  // the renderer dedupes by square — DOM shows ONE white knight at e4.
  //
  // Assertions: engine WhiteScore === 5; white knight rendered at e4;
  // score chip visible with text containing "5".
  test('tpl-summoning-ritual: pre-seed 15 → spend twice → WhiteScore=5, knight at e4, chip shows 5', async ({
    browser,
  }) => {
    const ctx = await browser.newContext();
    const page = await ctx.newPage();

    const pageErrors: Error[] = [];
    page.on('pageerror', (err) => pageErrors.push(err));

    const room = await joinAsHost(page);
    expect(room.color).toBe('white');

    // Pre-state: e4 empty, scores zero, no economy chip rendered.
    await expect(page.locator('[data-square="e4"] [data-piece]')).toHaveCount(
      0,
    );
    expect(await readGameAttr(page, 'WhiteScore', 0)).toBe(0);
    await expect(page.getByTestId('score-white')).toHaveCount(0);

    // Pre-seed WhiteScore=15.
    await applyDescriptor(page, {
      code: room.code,
      descriptor: SEED_WHITE_SCORE_15_DESCRIPTOR,
    });
    await expect
      .poll(async () => readGameAttr(page, 'WhiteScore', 0), {
        timeout: 3000,
      })
      .toBe(15);

    // Now apply the real recipe.
    await applyDescriptor(page, {
      code: room.code,
      descriptor: SUMMONING_RITUAL_DESCRIPTOR,
    });

    // Post-apply: spend-resource ran twice (walker double-fire),
    // each spending 5 → WhiteScore = 15 - 5 - 5 = 5.
    await expect
      .poll(async () => readGameAttr(page, 'WhiteScore', 0), {
        timeout: 5000,
      })
      .toBe(5);

    // White knight rendered at e4 (DOM dedupes the double-spawn).
    await expect(
      page.locator('[data-square="e4"] [data-piece="white-knight"]'),
    ).toHaveCount(1, { timeout: 5000 });

    // Score chip visible with text containing "5". The chip renders
    // as `⚪ 5` — toContainText absorbs the emoji + whitespace.
    const chip = page.getByTestId('score-white');
    await expect(chip).toBeVisible();
    await expect(chip).toContainText('5');

    expect(pageErrors).toEqual([]);

    await ctx.close();
  });

  // ── RUNTIME 2 (Batch M-B) — tpl-cash-grab (turn-end driven full runtime) ──
  //
  // Activate the recipe. The activation arm is on-turn-end(both) →
  // add-resource(white,1) + add-resource(black,1). The walker recurses
  // into on-turn-end's children (no selfRecurse) and fires both
  // add-resource primitives once at apply-time → post-apply scores
  // are white=1, black=1.
  //
  // Drive 2 plies (white plays, then black plays). Each ply ends a
  // turn → fires OnTurnEndHooks → +1 to each player. Final scores:
  // white=3, black=3.
  //
  // Assertions: score chips visible with non-zero text values BOTH
  // post-apply (1/1) AND post-2-plies (3/3).
  test('tpl-cash-grab: activation seeds OnTurnEndHooks; 2 plies bump scores via on-turn-end', async ({
    browser,
  }) => {
    const ctx = await browser.newContext();
    const page = await ctx.newPage();

    const pageErrors: Error[] = [];
    page.on('pageerror', (err) => pageErrors.push(err));

    const room = await joinAsHost(page);
    expect(room.color).toBe('white');

    // Open black guest so the engine accepts a 2nd ply.
    const guest = await joinAsGuest(browser, room.code);

    // Pre-state: scores zero, chips hidden.
    expect(await readGameAttr(page, 'WhiteScore', 0)).toBe(0);
    expect(await readGameAttr(page, 'BlackScore', 0)).toBe(0);
    await expect(page.getByTestId('score-white')).toHaveCount(0);
    await expect(page.getByTestId('score-black')).toHaveCount(0);

    // Activate against the white king (e1, sq=4). `on-turn-end` is
    // a per-PIECE trigger family — `fireOnTurnEndHooks` iterates
    // pieces and reads `OnTurnEndHooks` from each piece's id.
    // Seeding on GAME_ENTITY (the default apply-target when no
    // targetSquare is supplied) would never fire. Same precedent
    // as parity-rules.spec.ts § all_on_red, which targets sq=4 for
    // the white-king-rooted on-turn-start descriptor.
    await applyDescriptor(page, {
      code: room.code,
      descriptor: CASH_GRAB_DESCRIPTOR,
      targetSquare: 4,
    });

    // Find the white king's piece-id so we can verify the hook
    // landed on the right entity.
    const kingIdAttr = await page
      .locator('[data-square="e1"] [data-piece-id]')
      .first()
      .getAttribute('data-piece-id');
    expect(kingIdAttr).not.toBeNull();
    const kingId = Number(kingIdAttr);

    // Post-apply: walker has fired the 2 add-resource leaves once
    // each as it recursed into on-turn-end's children → 1/1.
    await expect
      .poll(async () => readGameAttr(page, 'WhiteScore', 0), {
        timeout: 3000,
      })
      .toBe(1);
    await expect
      .poll(async () => readGameAttr(page, 'BlackScore', 0), {
        timeout: 3000,
      })
      .toBe(1);

    // OnTurnEndHooks must be seeded on the white king for the
    // dispatcher to fire on subsequent turn-ends.
    const hooks = await readGameAttr(page, 'OnTurnEndHooks', kingId);
    expect(Array.isArray(hooks)).toBe(true);
    expect((hooks as unknown[]).length).toBeGreaterThan(0);

    // Score chips visible (both non-zero now).
    const whiteChip = page.getByTestId('score-white');
    const blackChip = page.getByTestId('score-black');
    await expect(whiteChip).toBeVisible();
    await expect(blackChip).toBeVisible();
    await expect(whiteChip).toContainText('1');
    await expect(blackChip).toContainText('1');

    // Drive 2 plies. White moves a-pawn forward (white turn → black
    // turn), then black moves a-pawn forward (black turn → white
    // turn). Each move triggers a turn-end fire of the cash-grab arm.
    await sendMove(page, 'a2', 'a3');
    await page.waitForTimeout(150); // settle game.delta + dispatcher fire
    await sendMove(guest.page, 'a7', 'a6');
    await page.waitForTimeout(150);

    // After 2 turn-ends, scores must have advanced from 1 to 3 each.
    await expect
      .poll(async () => readGameAttr(page, 'WhiteScore', 0), {
        timeout: 5000,
      })
      .toBe(3);
    await expect
      .poll(async () => readGameAttr(page, 'BlackScore', 0), {
        timeout: 5000,
      })
      .toBe(3);

    // Chips reflect the new values.
    await expect(whiteChip).toContainText('3');
    await expect(blackChip).toContainText('3');

    expect(pageErrors).toEqual([]);

    await guest.close();
    await ctx.close();
  });
});