(function attachBackgroundStep2(root, factory) {
  root.MultiPageBackgroundStep2 = factory();
})(typeof self !== 'undefined' ? self : globalThis, function createBackgroundStep2Module() {
  function createStep2Executor(deps = {}) {
    const {
      addLog,
      chrome,
      completeStepFromBackground,
      ensureContentScriptReadyOnTab,
      ensureSignupEntryPageReady,
      ensureSignupPostEmailPageReadyInTab,
      getTabId,
      isTabAlive,
      resolveSignupEmailForFlow,
      sendToContentScriptResilient,
      SIGNUP_PAGE_INJECT_FILES,
    } = deps;

    async function executeStep2(state) {
      const resolvedEmail = await resolveSignupEmailForFlow(state);
      const maxAttempts = 2;
      let lastError = null;

      for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
        let signupTabId = await getTabId('signup-page');
        if (!signupTabId || !(await isTabAlive('signup-page'))) {
          await addLog('步骤 2：未发现可用的注册页标签，正在重新打开 ChatGPT 官网...', 'warn');
          signupTabId = (await ensureSignupEntryPageReady(2, { reloadIfSameUrl: true })).tabId;
        } else if (attempt > 1) {
          await addLog(`步骤 2：第 ${attempt}/${maxAttempts} 次尝试，正在重新打开注册入口后重试邮箱提交...`, 'warn');
          signupTabId = (await ensureSignupEntryPageReady(2, { reloadIfSameUrl: true })).tabId;
        } else {
          await chrome.tabs.update(signupTabId, { active: true });
          await ensureContentScriptReadyOnTab('signup-page', signupTabId, {
            inject: SIGNUP_PAGE_INJECT_FILES,
            injectSource: 'signup-page',
            timeoutMs: 45000,
            retryDelayMs: 900,
            logMessage: '步骤 2：注册入口页内容脚本未就绪，正在等待页面恢复...',
          });
        }

        try {
          const step2Result = await sendToContentScriptResilient('signup-page', {
            type: 'EXECUTE_STEP',
            step: 2,
            source: 'background',
            payload: { email: resolvedEmail },
          }, {
            timeoutMs: 20000,
            retryDelayMs: 700,
            logMessage: '步骤 2：官网注册入口正在切换，等待页面恢复后继续输入邮箱...',
          });

          if (step2Result?.error) {
            throw new Error(step2Result.error);
          }

          if (!step2Result?.alreadyOnPasswordPage) {
            await addLog(`步骤 2：邮箱 ${resolvedEmail} 已提交，正在等待页面加载并确认下一步入口...`);
          }

          const landingResult = await ensureSignupPostEmailPageReadyInTab(signupTabId, 2, {
            skipUrlWait: Boolean(step2Result?.alreadyOnPasswordPage),
          });

          await completeStepFromBackground(2, {
            email: resolvedEmail,
            nextSignupState: landingResult?.state || 'password_page',
            nextSignupUrl: landingResult?.url || step2Result?.url || '',
            skippedPasswordStep: landingResult?.state === 'verification_page',
          });
          return;
        } catch (error) {
          lastError = error;
          if (attempt >= maxAttempts) {
            throw error;
          }
          await addLog(`步骤 2：当前尝试未能稳定进入下一页面，准备重新打开注册入口后重试。原因：${error?.message || error}`, 'warn');
        }
      }

      throw lastError || new Error('步骤 2：邮箱提交流程失败。');
    }

    return { executeStep2 };
  }

  return { createStep2Executor };
});