(function attachBackgroundMessageRouter(root, factory) {
  root.MultiPageBackgroundMessageRouter = factory();
})(typeof self !== 'undefined' ? self : globalThis, function createBackgroundMessageRouterModule() {
  function createMessageRouter(deps = {}) {
    const {
      addLog,
      appendAccountRunRecord,
      batchUpdateLuckmailPurchases,
      buildLocalhostCleanupPrefix,
      buildLuckmailSessionSettingsPayload,
      buildPersistentSettingsPayload,
      broadcastDataUpdate,
      cancelScheduledAutoRun,
      checkIcloudSession,
      clearAccountRunHistory,
      deleteAccountRunHistoryRecords,
      clearAutoRunTimerAlarm,
      clearLuckmailRuntimeState,
      clearStopRequest,
      closeLocalhostCallbackTabs,
      closeTabsByUrlPrefix,
      deleteHotmailAccount,
      deleteHotmailAccounts,
      deleteIcloudAlias,
      deleteUsedIcloudAliases,
      disableUsedLuckmailPurchases,
      doesStepUseCompletionSignal,
      ensureMail2925MailboxSession,
      ensureManualInteractionAllowed,
      executeStep,
      executeStepViaCompletionSignal,
      exportSettingsBundle,
      fetchGeneratedEmail,
      finalizeStep3Completion,
      finalizeIcloudAliasAfterSuccessfulFlow,
      findHotmailAccount,
      flushCommand,
      getCurrentLuckmailPurchase,
      getCurrentMail2925Account,
      getPendingAutoRunTimerPlan,
      getSourceLabel,
      getState,
      getStopRequested,
      handleAutoRunLoopUnhandledError,
      importSettingsBundle,
      invalidateDownstreamAfterStepRestart,
      isCloudflareSecurityBlockedError,
      isAutoRunLockedState,
      isHotmailProvider,
      isLocalhostOAuthCallbackUrl,
      isLuckmailProvider,
      isStopError,
      launchAutoRunTimerPlan,
      listIcloudAliases,
      listLuckmailPurchasesForManagement,
      normalizeHotmailAccounts,
      normalizeMail2925Accounts,
      normalizeRunCount,
      AUTO_RUN_TIMER_KIND_SCHEDULED_START,
      notifyStepComplete,
      notifyStepError,
      patchMail2925Account,
      patchHotmailAccount,
      pollContributionStatus,
      registerTab,
      requestStop,
      handleCloudflareSecurityBlocked,
      resetState,
      resumeAutoRun,
      scheduleAutoRun,
      selectLuckmailPurchase,
      setCurrentMail2925Account,
      setCurrentHotmailAccount,
      setContributionMode,
      setEmailState,
      setEmailStateSilently,
      setIcloudAliasPreservedState,
      setIcloudAliasUsedState,
      setLuckmailPurchaseDisabledState,
      setLuckmailPurchasePreservedState,
      setLuckmailPurchaseUsedState,
      setPersistentSettings,
      setState,
      setStepStatus,
      skipAutoRunCountdown,
      skipStep,
      startContributionFlow,
      startAutoRunLoop,
      deleteMail2925Account,
      deleteMail2925Accounts,
      syncHotmailAccounts,
      testHotmailAccountMailAccess,
      upsertMail2925Account,
      upsertHotmailAccount,
      verifyHotmailAccount,
    } = deps;

    async function appendManualAccountRunRecordIfNeeded(status, stateOverride = null, reason = '') {
      if (typeof appendAccountRunRecord !== 'function') {
        return null;
      }

      const state = stateOverride || await getState();
      if (isAutoRunLockedState(state)) {
        return null;
      }

      return appendAccountRunRecord(status, state, reason);
    }

    async function handleStepData(step, payload) {
      switch (step) {
        case 1: {
          const updates = {};
          if (payload.oauthUrl) {
            updates.oauthUrl = payload.oauthUrl;
            broadcastDataUpdate({ oauthUrl: payload.oauthUrl });
          }
          if (payload.sub2apiSessionId !== undefined) updates.sub2apiSessionId = payload.sub2apiSessionId || null;
          if (payload.sub2apiOAuthState !== undefined) updates.sub2apiOAuthState = payload.sub2apiOAuthState || null;
          if (payload.sub2apiGroupId !== undefined) updates.sub2apiGroupId = payload.sub2apiGroupId || null;
          if (payload.sub2apiDraftName !== undefined) updates.sub2apiDraftName = payload.sub2apiDraftName || null;
          if (payload.sub2apiProxyId !== undefined) updates.sub2apiProxyId = payload.sub2apiProxyId || null;
          if (Object.keys(updates).length) {
            await setState(updates);
          }
          break;
        }
        case 2:
          if (payload.email) {
            await setEmailState(payload.email);
          }
          if (payload.skippedPasswordStep) {
            const latestState = await getState();
            const step3Status = latestState.stepStatuses?.[3];
            if (step3Status !== 'running' && step3Status !== 'completed' && step3Status !== 'manual_completed') {
              await setStepStatus(3, 'skipped');
              await addLog('步骤 2：提交邮箱后页面直接进入邮箱验证码页，已自动跳过步骤 3。', 'warn');
            }
          }
          break;
        case 3:
          if (payload.email) await setEmailState(payload.email);
          if (payload.signupVerificationRequestedAt) {
            await setState({ signupVerificationRequestedAt: payload.signupVerificationRequestedAt });
          }
          if (payload.loginVerificationRequestedAt) {
            await setState({ loginVerificationRequestedAt: payload.loginVerificationRequestedAt });
          }
          break;
        case 7:
          if (payload.loginVerificationRequestedAt) {
            await setState({ loginVerificationRequestedAt: payload.loginVerificationRequestedAt });
          }
          break;
        case 4:
          await setState({
            lastEmailTimestamp: payload.emailTimestamp || null,
            signupVerificationRequestedAt: null,
          });
          break;
        case 8:
          await setState({
            lastEmailTimestamp: payload.emailTimestamp || null,
            loginVerificationRequestedAt: null,
          });
          break;
        case 9:
          if (payload.localhostUrl) {
            if (!isLocalhostOAuthCallbackUrl(payload.localhostUrl)) {
              throw new Error('步骤 9 返回了无效的 localhost OAuth 回调地址。');
            }
            await setState({ localhostUrl: payload.localhostUrl });
            broadcastDataUpdate({ localhostUrl: payload.localhostUrl });
          }
          break;
        case 10: {
          if (payload.localhostUrl) {
            await closeLocalhostCallbackTabs(payload.localhostUrl);
          }
          const latestState = await getState();
          if (latestState.currentHotmailAccountId && isHotmailProvider(latestState)) {
            await patchHotmailAccount(latestState.currentHotmailAccountId, {
              used: true,
              lastUsedAt: Date.now(),
            });
            await addLog('当前 Hotmail 账号已自动标记为已用。', 'ok');
          }
          if (String(latestState.mailProvider || '').trim().toLowerCase() === '2925' && latestState.currentMail2925AccountId) {
            await patchMail2925Account(latestState.currentMail2925AccountId, {
              lastUsedAt: Date.now(),
              lastError: '',
            });
            await addLog('当前 2925 账号已记录最近使用时间。', 'ok');
          }
          if (isLuckmailProvider(latestState)) {
            const currentPurchase = getCurrentLuckmailPurchase(latestState);
            if (currentPurchase?.id) {
              await setLuckmailPurchaseUsedState(currentPurchase.id, true);
              await addLog(`当前 LuckMail 邮箱 ${currentPurchase.email_address} 已在本地标记为已用。`, 'ok');
            }
            await clearLuckmailRuntimeState({ clearEmail: true });
            await addLog('当前 LuckMail 邮箱运行态已清空，下轮将优先复用未用邮箱或重新购买邮箱。', 'ok');
          }
          const localhostPrefix = buildLocalhostCleanupPrefix(payload.localhostUrl);
          if (localhostPrefix) {
            await closeTabsByUrlPrefix(localhostPrefix, {
              excludeUrls: [payload.localhostUrl],
              excludeLocalhostCallbacks: true,
            });
          }
          await finalizeIcloudAliasAfterSuccessfulFlow(latestState);
          break;
        }
        default:
          break;
      }
    }

    async function handleMessage(message, sender) {
      switch (message.type) {
        case 'CONTENT_SCRIPT_READY': {
          const tabId = sender.tab?.id;
          if (tabId && message.source) {
            await registerTab(message.source, tabId);
            flushCommand(message.source, tabId);
            await addLog(`内容脚本已就绪：${getSourceLabel(message.source)}（标签页 ${tabId}）`);
          }
          return { ok: true };
        }

        case 'LOG': {
          const { message: msg, level } = message.payload;
          await addLog(`[${getSourceLabel(message.source)}] ${msg}`, level);
          return { ok: true };
        }

        case 'STEP_COMPLETE': {
          if (getStopRequested()) {
            await setStepStatus(message.step, 'stopped');
            await appendManualAccountRunRecordIfNeeded(`step${message.step}_stopped`, null, '流程已被用户停止。');
            notifyStepError(message.step, '流程已被用户停止。');
            return { ok: true };
          }
          try {
            if (message.step === 3 && typeof finalizeStep3Completion === 'function') {
              await finalizeStep3Completion(message.payload || {});
            }
          } catch (error) {
            if (typeof isCloudflareSecurityBlockedError === 'function' && isCloudflareSecurityBlockedError(error)) {
              const userMessage = typeof handleCloudflareSecurityBlocked === 'function'
                ? await handleCloudflareSecurityBlocked(error)
                : (error?.message || String(error || ''));
              notifyStepError(message.step, '流程已被用户停止。');
              return { ok: true, error: userMessage };
            }
            const errorMessage = error?.message || String(error || '步骤 3 提交后确认失败');
            await setStepStatus(message.step, 'failed');
            await addLog(`步骤 ${message.step} 失败：${errorMessage}`, 'error');
            await appendManualAccountRunRecordIfNeeded(`step${message.step}_failed`, null, errorMessage);
            notifyStepError(message.step, errorMessage);
            return { ok: true, error: errorMessage };
          }

          const completionState = message.step === 10 ? await getState() : null;
          await setStepStatus(message.step, 'completed');
          await addLog(`步骤 ${message.step} 已完成`, 'ok');
          await handleStepData(message.step, message.payload);
          if (message.step === 10 && typeof appendAccountRunRecord === 'function') {
            await appendAccountRunRecord('success', completionState);
          }
          notifyStepComplete(message.step, message.payload);
          return { ok: true };
        }

        case 'STEP_ERROR': {
          if (typeof isCloudflareSecurityBlockedError === 'function' && isCloudflareSecurityBlockedError(message.error)) {
            const userMessage = typeof handleCloudflareSecurityBlocked === 'function'
              ? await handleCloudflareSecurityBlocked(message.error)
              : (typeof message.error === 'string' ? message.error : String(message.error || ''));
            notifyStepError(message.step, '流程已被用户停止。');
            return { ok: true, error: userMessage };
          }
          if (isStopError(message.error)) {
            await setStepStatus(message.step, 'stopped');
            await addLog(`步骤 ${message.step} 已被用户停止`, 'warn');
            await appendManualAccountRunRecordIfNeeded(`step${message.step}_stopped`, null, message.error);
            notifyStepError(message.step, message.error);
          } else {
            await setStepStatus(message.step, 'failed');
            await addLog(`步骤 ${message.step} 失败：${message.error}`, 'error');
            await appendManualAccountRunRecordIfNeeded(`step${message.step}_failed`, null, message.error);
            notifyStepError(message.step, message.error);
          }
          return { ok: true };
        }

        case 'GET_STATE': {
          return await getState();
        }

        case 'RESET': {
          clearStopRequest();
          await clearAutoRunTimerAlarm();
          await resetState();
          await addLog('流程已重置', 'info');
          return { ok: true };
        }

        case 'SET_CONTRIBUTION_MODE': {
          const enabled = Boolean(message.payload?.enabled);
          const state = await ensureManualInteractionAllowed(enabled ? '进入贡献模式' : '退出贡献模式');
          if (Object.values(state.stepStatuses || {}).some((status) => status === 'running')) {
            throw new Error(enabled ? '当前有步骤正在执行，无法进入贡献模式。' : '当前有步骤正在执行，无法退出贡献模式。');
          }
          if (typeof setContributionMode !== 'function') {
            throw new Error('贡献模式切换能力未接入。');
          }
          return {
            ok: true,
            state: await setContributionMode(enabled),
          };
        }

        case 'START_CONTRIBUTION_FLOW': {
          const state = await ensureManualInteractionAllowed('开始贡献');
          if (Object.values(state.stepStatuses || {}).some((status) => status === 'running')) {
            throw new Error('当前有步骤正在执行，无法开始贡献流程。');
          }
          if (typeof startContributionFlow !== 'function') {
            throw new Error('贡献 OAuth 流程尚未接入。');
          }
          return {
            ok: true,
            state: await startContributionFlow({
              nickname: message.payload?.nickname,
              qq: message.payload?.qq,
            }),
          };
        }

        case 'SET_CONTRIBUTION_PROFILE': {
          const state = await getState();
          if (!state?.contributionMode) {
            throw new Error('请先进入贡献模式。');
          }
          const nickname = String(message.payload?.nickname || '').trim();
          const qq = String(message.payload?.qq || '').trim();
          if (qq && !/^\d{1,20}$/.test(qq)) {
            throw new Error('QQ 只能填写数字，且长度不能超过 20 位。');
          }
          await setState({
            contributionNickname: nickname,
            contributionQq: qq,
          });
          return {
            ok: true,
            state: await getState(),
          };
        }

        case 'POLL_CONTRIBUTION_STATUS': {
          if (typeof pollContributionStatus !== 'function') {
            throw new Error('贡献状态轮询能力尚未接入。');
          }
          return {
            ok: true,
            state: await pollContributionStatus({
              reason: message.payload?.reason || 'sidepanel_poll',
            }),
          };
        }

        case 'CLEAR_ACCOUNT_RUN_HISTORY': {
          const state = await getState();
          if (isAutoRunLockedState(state)) {
            throw new Error('自动流程运行中，当前不能清理邮箱记录。');
          }
          if (typeof clearAccountRunHistory !== 'function') {
            return { ok: true, clearedCount: 0 };
          }
          const result = await clearAccountRunHistory(state);
          return { ok: true, ...result };
        }

        case 'DELETE_ACCOUNT_RUN_HISTORY_RECORDS': {
          const state = await getState();
          if (isAutoRunLockedState(state)) {
            throw new Error('自动流程运行中，当前不能删除邮箱记录。');
          }
          if (typeof deleteAccountRunHistoryRecords !== 'function') {
            return { ok: true, deletedCount: 0, remainingCount: 0 };
          }
          const recordIds = Array.isArray(message.payload?.recordIds) ? message.payload.recordIds : [];
          const result = await deleteAccountRunHistoryRecords(recordIds, state);
          return { ok: true, ...result };
        }

        case 'EXECUTE_STEP': {
          clearStopRequest();
          if (message.source === 'sidepanel') {
            await ensureManualInteractionAllowed('手动执行步骤');
          }
          const step = message.payload.step;
          if (message.source === 'sidepanel') {
            await invalidateDownstreamAfterStepRestart(step, { logLabel: `步骤 ${step} 重新执行` });
          }
          if (message.payload.email) {
            await setEmailState(message.payload.email);
          }
          if (message.payload.emailPrefix !== undefined) {
            await setPersistentSettings({ emailPrefix: message.payload.emailPrefix });
            await setState({ emailPrefix: message.payload.emailPrefix });
          }
          if (doesStepUseCompletionSignal(step)) {
            await executeStepViaCompletionSignal(step);
          } else {
            await executeStep(step);
          }
          return { ok: true };
        }

        case 'AUTO_RUN': {
          clearStopRequest();
          if (Boolean(message.payload?.contributionMode) && typeof setContributionMode === 'function') {
            await setContributionMode(true);
            if (typeof setState === 'function') {
              const contributionNickname = String(message.payload?.contributionNickname || '').trim();
              const contributionQq = String(message.payload?.contributionQq || '').trim();
              await setState({
                contributionNickname,
                contributionQq,
              });
            }
          }
          const state = await getState();
          if (getPendingAutoRunTimerPlan(state)) {
            throw new Error('已有自动运行倒计时计划，请先取消或立即开始。');
          }
          const totalRuns = normalizeRunCount(message.payload?.totalRuns || 1);
          const autoRunSkipFailures = Boolean(message.payload?.autoRunSkipFailures);
          const mode = message.payload?.mode === 'continue' ? 'continue' : 'restart';
          await setState({ autoRunSkipFailures });
          startAutoRunLoop(totalRuns, { autoRunSkipFailures, mode });
          return { ok: true };
        }

        case 'SCHEDULE_AUTO_RUN': {
          clearStopRequest();
          if (Boolean(message.payload?.contributionMode) && typeof setContributionMode === 'function') {
            await setContributionMode(true);
            if (typeof setState === 'function') {
              const contributionNickname = String(message.payload?.contributionNickname || '').trim();
              const contributionQq = String(message.payload?.contributionQq || '').trim();
              await setState({
                contributionNickname,
                contributionQq,
              });
            }
          }
          const totalRuns = normalizeRunCount(message.payload?.totalRuns || 1);
          return await scheduleAutoRun(totalRuns, {
            delayMinutes: message.payload?.delayMinutes,
            autoRunSkipFailures: Boolean(message.payload?.autoRunSkipFailures),
            mode: message.payload?.mode,
          });
        }

        case 'START_SCHEDULED_AUTO_RUN_NOW': {
          clearStopRequest();
          const started = await launchAutoRunTimerPlan('manual', {
            expectedKinds: [AUTO_RUN_TIMER_KIND_SCHEDULED_START],
          });
          if (!started) {
            throw new Error('当前没有可立即开始的倒计时计划。');
          }
          return { ok: true };
        }

        case 'CANCEL_SCHEDULED_AUTO_RUN': {
          const cancelled = await cancelScheduledAutoRun();
          if (!cancelled) {
            throw new Error('当前没有可取消的倒计时计划。');
          }
          return { ok: true };
        }

        case 'SKIP_AUTO_RUN_COUNTDOWN': {
          clearStopRequest();
          const skipped = await skipAutoRunCountdown();
          if (!skipped) {
            throw new Error('当前没有可立即开始的倒计时。');
          }
          return { ok: true };
        }

        case 'RESUME_AUTO_RUN': {
          clearStopRequest();
          if (message.payload.email) {
            await setEmailState(message.payload.email);
          }
          resumeAutoRun().catch((error) => {
            handleAutoRunLoopUnhandledError(error).catch(() => {});
          });
          return { ok: true };
        }

        case 'TAKEOVER_AUTO_RUN': {
          await requestStop({ logMessage: '已确认手动接管，正在停止自动流程并切换为手动控制...' });
          await addLog('自动流程已切换为手动控制。', 'warn');
          return { ok: true };
        }

        case 'SKIP_STEP': {
          const step = Number(message.payload?.step);
          return await skipStep(step);
        }

        case 'SAVE_SETTING': {
          const updates = buildPersistentSettingsPayload(message.payload || {});
          const sessionUpdates = buildLuckmailSessionSettingsPayload(message.payload || {});
          await setPersistentSettings(updates);
          await setState({
            ...updates,
            ...sessionUpdates,
          });
          return { ok: true, state: await getState() };
        }

        case 'EXPORT_SETTINGS': {
          return { ok: true, ...(await exportSettingsBundle()) };
        }

        case 'IMPORT_SETTINGS': {
          const state = await importSettingsBundle(message.payload?.config || null);
          return { ok: true, state };
        }

        case 'UPSERT_HOTMAIL_ACCOUNT': {
          const account = await upsertHotmailAccount(message.payload || {});
          return { ok: true, account };
        }

        case 'DELETE_HOTMAIL_ACCOUNT': {
          await deleteHotmailAccount(String(message.payload?.accountId || ''));
          return { ok: true };
        }

        case 'DELETE_HOTMAIL_ACCOUNTS': {
          const result = await deleteHotmailAccounts(String(message.payload?.mode || 'all'));
          return { ok: true, ...result };
        }

        case 'SELECT_HOTMAIL_ACCOUNT': {
          const account = await setCurrentHotmailAccount(String(message.payload?.accountId || ''), {
            markUsed: false,
            syncEmail: true,
          });
          return { ok: true, account };
        }

        case 'PATCH_HOTMAIL_ACCOUNT': {
          const account = await patchHotmailAccount(
            String(message.payload?.accountId || ''),
            message.payload?.updates || {}
          );
          return { ok: true, account };
        }

        case 'VERIFY_HOTMAIL_ACCOUNT':
        case 'AUTHORIZE_HOTMAIL_ACCOUNT': {
          const accountId = String(message.payload?.accountId || '');
          try {
            const result = await verifyHotmailAccount(accountId);
            await setCurrentHotmailAccount(result.account.id, { markUsed: false, syncEmail: true });
            await addLog(`Hotmail 账号 ${result.account.email} 校验通过，可直接用于收信。`, 'ok');
            return { ok: true, account: result.account, messageCount: result.messageCount };
          } catch (err) {
            const state = await getState();
            const accounts = normalizeHotmailAccounts(state.hotmailAccounts);
            const target = findHotmailAccount(accounts, accountId);
            if (target) {
              target.status = 'error';
              target.lastError = err.message;
              await syncHotmailAccounts(accounts.map((item) => (item.id === target.id ? target : item)));
            }
            throw err;
          }
        }

        case 'TEST_HOTMAIL_ACCOUNT': {
          const result = await testHotmailAccountMailAccess(String(message.payload?.accountId || ''));
          return { ok: true, ...result };
        }

        case 'UPSERT_MAIL2925_ACCOUNT': {
          const account = await upsertMail2925Account(message.payload || {});
          return { ok: true, account };
        }

        case 'DELETE_MAIL2925_ACCOUNT': {
          await deleteMail2925Account(String(message.payload?.accountId || ''));
          return { ok: true };
        }

        case 'DELETE_MAIL2925_ACCOUNTS': {
          const result = await deleteMail2925Accounts(String(message.payload?.mode || 'all'));
          return { ok: true, ...result };
        }

        case 'SELECT_MAIL2925_ACCOUNT': {
          const account = await setCurrentMail2925Account(String(message.payload?.accountId || ''), {
            updateLastUsedAt: false,
          });
          return { ok: true, account };
        }

        case 'PATCH_MAIL2925_ACCOUNT': {
          const account = await patchMail2925Account(
            String(message.payload?.accountId || ''),
            message.payload?.updates || {}
          );
          return { ok: true, account };
        }

        case 'LOGIN_MAIL2925_ACCOUNT': {
          const accountId = String(message.payload?.accountId || '');
          const account = await setCurrentMail2925Account(accountId, {
            updateLastUsedAt: false,
          });
          if (typeof deps.ensureMail2925MailboxSession !== 'function') {
            throw new Error('2925 登录能力尚未接入。');
          }
          await deps.ensureMail2925MailboxSession({
            accountId: account.id,
            forceRelogin: Boolean(message.payload?.forceRelogin),
            actionLabel: '侧边栏手动登录 2925 账号',
          });
          return { ok: true, account };
        }

        case 'LIST_LUCKMAIL_PURCHASES': {
          const purchases = await listLuckmailPurchasesForManagement();
          return { ok: true, purchases };
        }

        case 'SELECT_LUCKMAIL_PURCHASE': {
          const purchase = await selectLuckmailPurchase(message.payload?.purchaseId);
          return { ok: true, purchase };
        }

        case 'SET_LUCKMAIL_PURCHASE_USED_STATE': {
          const result = await setLuckmailPurchaseUsedState(message.payload?.purchaseId, Boolean(message.payload?.used));
          return { ok: true, ...result };
        }

        case 'SET_LUCKMAIL_PURCHASE_PRESERVED_STATE': {
          const purchase = await setLuckmailPurchasePreservedState(message.payload?.purchaseId, Boolean(message.payload?.preserved));
          return { ok: true, purchase };
        }

        case 'SET_LUCKMAIL_PURCHASE_DISABLED_STATE': {
          const purchase = await setLuckmailPurchaseDisabledState(message.payload?.purchaseId, Boolean(message.payload?.disabled));
          return { ok: true, purchase };
        }

        case 'BATCH_UPDATE_LUCKMAIL_PURCHASES': {
          const result = await batchUpdateLuckmailPurchases(message.payload || {});
          return { ok: true, ...result };
        }

        case 'DISABLE_USED_LUCKMAIL_PURCHASES': {
          const result = await disableUsedLuckmailPurchases();
          return { ok: true, ...result };
        }

        case 'SET_EMAIL_STATE': {
          const state = await getState();
          if (isAutoRunLockedState(state)) {
            throw new Error('自动流程运行中，当前不能手动修改邮箱。');
          }
          const email = String(message.payload?.email || '').trim() || null;
          await setEmailStateSilently(email);
          return { ok: true, email };
        }

        case 'SAVE_EMAIL': {
          const state = await getState();
          if (isAutoRunLockedState(state)) {
            throw new Error('自动流程运行中，当前不能手动修改邮箱。');
          }
          await setEmailState(message.payload.email);
          await resumeAutoRun();
          return { ok: true, email: message.payload.email };
        }

        case 'FETCH_GENERATED_EMAIL': {
          clearStopRequest();
          const state = await getState();
          if (isAutoRunLockedState(state)) {
            throw new Error('自动流程运行中，当前不能手动获取邮箱。');
          }
          const email = await fetchGeneratedEmail(state, message.payload || {});
          await resumeAutoRun();
          return { ok: true, email };
        }

        case 'FETCH_DUCK_EMAIL': {
          clearStopRequest();
          const state = await getState();
          if (isAutoRunLockedState(state)) {
            throw new Error('自动流程运行中，当前不能手动获取邮箱。');
          }
          const email = await fetchGeneratedEmail(state, { ...(message.payload || {}), generator: 'duck' });
          await resumeAutoRun();
          return { ok: true, email };
        }

        case 'CHECK_ICLOUD_SESSION': {
          clearStopRequest();
          return await checkIcloudSession();
        }

        case 'LIST_ICLOUD_ALIASES': {
          clearStopRequest();
          const aliases = await listIcloudAliases();
          return { ok: true, aliases };
        }

        case 'SET_ICLOUD_ALIAS_USED_STATE': {
          clearStopRequest();
          const result = await setIcloudAliasUsedState(message.payload || {});
          return { ok: true, ...result };
        }

        case 'SET_ICLOUD_ALIAS_PRESERVED_STATE': {
          clearStopRequest();
          const result = await setIcloudAliasPreservedState(message.payload || {});
          return { ok: true, ...result };
        }

        case 'DELETE_ICLOUD_ALIAS': {
          clearStopRequest();
          const result = await deleteIcloudAlias(message.payload || {});
          return { ok: true, ...result };
        }

        case 'DELETE_USED_ICLOUD_ALIASES': {
          clearStopRequest();
          const result = await deleteUsedIcloudAliases();
          return { ok: true, ...result };
        }

        case 'STOP_FLOW': {
          await requestStop();
          return { ok: true };
        }

        default:
          console.warn('Unknown message type:', message.type);
          return { error: `Unknown message type: ${message.type}` };
      }
    }

    return {
      handleMessage,
      handleStepData,
    };
  }

  return {
    createMessageRouter,
  };
});