console.log('[MultiPage:kiro-register-page] Content script loaded on', location.href);

const KIRO_REGISTER_PAGE_LISTENER_SENTINEL = 'data-multipage-kiro-register-page-listener';
const DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS = globalThis.MultiPageKiroTimeouts?.DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS || (3 * 60 * 1000);
const KIRO_CONTINUE_TEXT_PATTERN = /continue|继续/i;
const KIRO_BUILDER_ID_TEXT_PATTERN = /aws\s*builder\s*id|builder\s*id/i;
const KIRO_CONFIRM_CONTINUE_TEXT_PATTERN = /confirm and continue|确认并继续/i;
const KIRO_ALLOW_ACCESS_TEXT_PATTERN = /allow access|允许访问/i;
const KIRO_SUCCESS_TEXT_PATTERN = /authorization successful|you may now close this window|you are now signed in|授权成功|可以关闭此窗口|已登录/i;
const KIRO_CLOUDFRONT_403_TEXT_PATTERN = /403 error|the request could not be satisfied|generated by cloudfront/i;
const KIRO_AWS_REQUEST_ERROR_TEXT_PATTERN = /sorry,\s*there was an error processing your request\.?\s*please try again\.?|抱歉，处理您的请求时出错。请重试。?/i;
const KIRO_EMAIL_TEXT_PATTERN = /[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}/gi;
const KIRO_NON_ACCOUNT_EMAIL_DOMAINS = new Set([
  'amazon.com',
  'aws.amazon.com',
  'example.com',
  'kiro.dev',
]);

const KIRO_EMAIL_INPUT_SELECTOR = [
  'input[placeholder="username@example.com"]',
  'input[type="email"]',
  'input[name="email"]',
  'input[autocomplete="username"]',
  'input[placeholder*="example.com" i]',
].join(', ');

const KIRO_NAME_INPUT_SELECTOR = [
  'input[placeholder*="Silva" i]',
  'input[autocomplete="name"]',
  'input[name="name"]',
  'input[name="fullName"]',
].join(', ');

const KIRO_OTP_INPUT_SELECTOR = [
  'input[autocomplete="one-time-code"]',
  'input[inputmode="numeric"]',
  'input[placeholder*="6-digit" i]',
  'input[placeholder*="6 位" i]',
  'input[name*="otp" i]',
  'input[name*="code" i]',
].join(', ');

const KIRO_PASSWORD_FIELD_SELECTOR = 'input:not([type="hidden"]):not([type="checkbox"]):not([type="radio"]):not([type="submit"]):not([type="button"]):not([type="file"])';
const KIRO_PASSWORD_TEXT_PATTERN = /password|\u5bc6\u7801/i;
const KIRO_CONFIRM_PASSWORD_TEXT_PATTERN = /confirm\s*password|re[-\s]*enter\s*password|repeat\s*password|verify\s*password|\u786e\u8ba4\s*\u5bc6\u7801|\u518d\u6b21.*\u5bc6\u7801|\u91cd\u590d.*\u5bc6\u7801/i;
const KIRO_PRIMARY_PASSWORD_HINT_PATTERN = /enter\s*password|create\s*password|new\s*password|\u8f93\u5165.*\u5bc6\u7801|\u521b\u5efa.*\u5bc6\u7801|^\s*\u5bc6\u7801\s*$/i;
const KIRO_SIGN_IN_TEXT_PATTERN = /sign\s*in\s*with\s*your\s*aws\s*builder\s*id|aws\s*builder\s*id\s*sign\s*in/i;
const KIRO_CODE_INVALID_TEXT_PATTERN = /code\s*(?:is\s*)?invalid|invalid\s*code|\u4ee3\u7801\u65e0\u6548|\u9a8c\u8bc1\u7801\u65e0\u6548/i;
const KIRO_RESEND_CODE_TEXT_PATTERN = /resend|send\s*again|\u91cd\u65b0\u53d1\u9001/i;

function isVisibleKiroElement(element) {
  if (!element) return false;
  const style = window.getComputedStyle(element);
  const rect = element.getBoundingClientRect();
  return style.display !== 'none'
    && style.visibility !== 'hidden'
    && rect.width > 0
    && rect.height > 0;
}

function getKiroPageText() {
  return String(document.body?.textContent || '')
    .replace(/\s+/g, ' ')
    .trim();
}

function normalizeKiroEmailCandidate(value = '') {
  const matched = String(value || '').match(/[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}/i);
  return matched ? matched[0].trim().toLowerCase() : '';
}

function isLikelyKiroAccountEmail(value = '') {
  const normalized = normalizeKiroEmailCandidate(value);
  if (!normalized) {
    return false;
  }
  const [, domain = ''] = normalized.split('@');
  const normalizedDomain = domain.toLowerCase();
  if (KIRO_NON_ACCOUNT_EMAIL_DOMAINS.has(normalizedDomain)) {
    return false;
  }
  return !normalized.startsWith('no-reply@')
    && !normalized.startsWith('noreply@')
    && !normalized.startsWith('support@')
    && !normalizedDomain.endsWith('.amazon.com')
    && !normalizedDomain.endsWith('.amazonaws.com')
    && !normalizedDomain.endsWith('.kiro.dev')
    && !normalizedDomain.endsWith('.signin.aws')
    && !normalizedDomain.endsWith('.profile.aws');
}

function extractFirstKiroAccountEmailFromText(text = '') {
  const matches = String(text || '').match(KIRO_EMAIL_TEXT_PATTERN) || [];
  return matches.map((entry) => normalizeKiroEmailCandidate(entry)).find(isLikelyKiroAccountEmail) || '';
}

function findKiroSignedInAccountEmail(pageText = '') {
  const selector = [
    'input[type="email"]',
    'input[name*="email" i]',
    '[data-testid*="email" i]',
    '[aria-label*="email" i]',
    '[title*="email" i]',
  ].join(', ');
  for (const element of collectVisibleElements(selector)) {
    const candidate = extractFirstKiroAccountEmailFromText([
      element?.value,
      element?.textContent,
      element?.getAttribute?.('aria-label'),
      element?.getAttribute?.('title'),
    ].filter(Boolean).join(' '));
    if (candidate) {
      return candidate;
    }
  }
  return extractFirstKiroAccountEmailFromText(pageText);
}

function findKiroPageAccountEmail(pageText = '') {
  const selector = [
    'input[type="email"]',
    'input[name*="email" i]',
    '[data-testid*="email" i]',
    '[aria-label*="email" i]',
    '[title*="email" i]',
    'dd',
    'span',
    'div',
    'p',
  ].join(', ');
  for (const element of collectVisibleElements(selector)) {
    const candidate = extractFirstKiroAccountEmailFromText([
      element?.value,
      element?.textContent,
      element?.getAttribute?.('aria-label'),
      element?.getAttribute?.('title'),
    ].filter(Boolean).join(' '));
    if (candidate) {
      return candidate;
    }
  }
  return extractFirstKiroAccountEmailFromText(pageText);
}

function collectVisibleElements(selector) {
  return Array.from(document.querySelectorAll(selector))
    .filter((element) => isVisibleKiroElement(element));
}

function findFirstVisible(selector) {
  return collectVisibleElements(selector)[0] || null;
}

function getElementActionText(element) {
  return [
    element?.textContent,
    element?.value,
    element?.getAttribute?.('aria-label'),
    element?.getAttribute?.('title'),
    element?.getAttribute?.('data-testid'),
  ]
    .filter(Boolean)
    .join(' ')
    .replace(/\s+/g, ' ')
    .trim();
}

function findActionButton(options = {}) {
  const {
    preferredSelectors = [],
    textPattern = null,
    formOwner = null,
  } = options;

  for (const selector of preferredSelectors) {
    const preferred = findFirstVisible(selector);
    if (preferred && !preferred.disabled && preferred.getAttribute('aria-disabled') !== 'true') {
      return preferred;
    }
  }

  const candidates = collectVisibleElements('button, [role="button"], input[type="submit"], input[type="button"]')
    .filter((element) => !element.disabled && element.getAttribute('aria-disabled') !== 'true');

  const prioritized = formOwner
    ? candidates.filter((element) => (element.form || element.closest?.('form') || null) === formOwner)
    : [];
  const pool = prioritized.length ? prioritized : candidates;

  if (textPattern instanceof RegExp) {
    return pool.find((element) => textPattern.test(getElementActionText(element))) || null;
  }

  return pool[0] || null;
}

function findVisibleEmailInput() {
  return findFirstVisible(KIRO_EMAIL_INPUT_SELECTOR);
}

function findVisibleNameInput() {
  return findFirstVisible(KIRO_NAME_INPUT_SELECTOR);
}

function findVisibleOtpInput() {
  return findFirstVisible(KIRO_OTP_INPUT_SELECTOR);
}

function getKiroElementText(element) {
  return String(element?.textContent || '')
    .replace(/\s+/g, ' ')
    .trim();
}

function cssEscapeKiroValue(value = '') {
  if (globalThis.CSS?.escape) {
    return globalThis.CSS.escape(String(value));
  }
  return String(value).replace(/["\\]/g, '\\$&');
}

function getKiroInputLabelText(input) {
  const labels = [];
  for (const label of Array.from(input?.labels || [])) {
    const text = getKiroElementText(label);
    if (text) labels.push(text);
  }

  const id = String(input?.id || '').trim();
  if (id) {
    for (const label of Array.from(document.querySelectorAll(`label[for="${cssEscapeKiroValue(id)}"]`))) {
      const text = getKiroElementText(label);
      if (text) labels.push(text);
    }
  }

  const labelledBy = String(input?.getAttribute?.('aria-labelledby') || '').trim();
  if (labelledBy) {
    for (const labelId of labelledBy.split(/\s+/).filter(Boolean)) {
      const label = document.getElementById?.(labelId);
      const text = getKiroElementText(label);
      if (text) labels.push(text);
    }
  }

  const parentLabel = input?.closest?.('label');
  const parentLabelText = getKiroElementText(parentLabel);
  if (parentLabelText) labels.push(parentLabelText);

  return Array.from(new Set(labels)).join(' ');
}

function getKiroPasswordInputContext(input) {
  const describedBy = String(input?.getAttribute?.('aria-describedby') || '').trim();
  const describedByText = describedBy
    ? describedBy
      .split(/\s+/)
      .map((id) => getKiroElementText(document.getElementById?.(id)))
      .filter(Boolean)
      .join(' ')
    : '';

  return [
    input?.getAttribute?.('placeholder'),
    input?.getAttribute?.('name'),
    input?.id,
    input?.getAttribute?.('aria-label'),
    input?.getAttribute?.('data-testid'),
    input?.getAttribute?.('autocomplete'),
    getKiroInputLabelText(input),
    describedByText,
  ]
    .filter(Boolean)
    .join(' ')
    .replace(/\s+/g, ' ')
    .trim();
}

function createKiroPasswordCandidate(input, index) {
  const context = getKiroPasswordInputContext(input);
  const type = String(input?.getAttribute?.('type') || input?.type || '').trim().toLowerCase();
  const isConfirm = KIRO_CONFIRM_PASSWORD_TEXT_PATTERN.test(context);
  const hasPasswordHint = KIRO_PASSWORD_TEXT_PATTERN.test(context) || type === 'password';
  if (!hasPasswordHint && !isConfirm) {
    return null;
  }

  let primaryScore = 0;
  let confirmScore = 0;
  if (type === 'password') primaryScore += 5;
  if (KIRO_PASSWORD_TEXT_PATTERN.test(context)) primaryScore += 20;
  if (KIRO_PRIMARY_PASSWORD_HINT_PATTERN.test(context)) primaryScore += 40;
  if (isConfirm) {
    primaryScore -= 100;
    confirmScore += 100;
  }
  if (/^password$/i.test(String(input?.getAttribute?.('name') || ''))) primaryScore += 40;
  if (/^password$/i.test(String(input?.id || ''))) primaryScore += 20;

  return {
    input,
    index,
    context,
    isConfirm,
    primaryScore,
    confirmScore,
  };
}

function findKiroPasswordFields() {
  const candidates = collectVisibleElements(KIRO_PASSWORD_FIELD_SELECTOR)
    .map((input, index) => createKiroPasswordCandidate(input, index))
    .filter(Boolean);
  if (!candidates.length) {
    return {
      passwordInput: null,
      confirmPasswordInput: null,
      passwordInputs: [],
    };
  }

  const confirmCandidate = candidates
    .filter((candidate) => candidate.isConfirm)
    .sort((left, right) => right.confirmScore - left.confirmScore || left.index - right.index)[0] || null;

  let passwordCandidate = candidates
    .filter((candidate) => !candidate.isConfirm)
    .sort((left, right) => right.primaryScore - left.primaryScore || left.index - right.index)[0] || null;

  if (!passwordCandidate) {
    passwordCandidate = candidates
      .filter((candidate) => !confirmCandidate || candidate.input !== confirmCandidate.input)
      .sort((left, right) => left.index - right.index)[0] || null;
  }

  let resolvedConfirmCandidate = confirmCandidate;
  if (
    (!resolvedConfirmCandidate || resolvedConfirmCandidate.input === passwordCandidate?.input)
    && passwordCandidate
  ) {
    resolvedConfirmCandidate = candidates
      .filter((candidate) => candidate.input !== passwordCandidate.input)
      .sort((left, right) => left.index - right.index)[0] || null;
  }

  return {
    passwordInput: passwordCandidate?.input || null,
    confirmPasswordInput: resolvedConfirmCandidate?.input || null,
    passwordInputs: candidates.map((candidate) => candidate.input),
  };
}

function findVisiblePasswordInputs() {
  return findKiroPasswordFields().passwordInputs;
}

function findVisibleConfirmPasswordInput() {
  return findKiroPasswordFields().confirmPasswordInput;
}

function findEmailContinueButton(emailInput = null) {
  const form = emailInput?.form || emailInput?.closest?.('form') || null;
  return findActionButton({
    preferredSelectors: ['button[data-testid="test-primary-button"]'],
    textPattern: KIRO_CONTINUE_TEXT_PATTERN,
    formOwner: form,
  });
}

function findNameContinueButton(nameInput = null) {
  const form = nameInput?.form || nameInput?.closest?.('form') || null;
  return findActionButton({
    preferredSelectors: ['button[data-testid="signup-next-button"]'],
    textPattern: KIRO_CONTINUE_TEXT_PATTERN,
    formOwner: form,
  });
}

function findOtpVerifyButton(otpInput = null) {
  const form = otpInput?.form || otpInput?.closest?.('form') || null;
  return findActionButton({
    preferredSelectors: ['button[data-testid="email-verification-verify-button"]'],
    textPattern: KIRO_CONTINUE_TEXT_PATTERN,
    formOwner: form,
  });
}

function findOtpResendButton(otpInput = null) {
  const form = otpInput?.form || otpInput?.closest?.('form') || null;
  return findActionButton({
    textPattern: KIRO_RESEND_CODE_TEXT_PATTERN,
    formOwner: form,
  });
}

function findPasswordContinueButton(passwordInput = null) {
  const form = passwordInput?.form || passwordInput?.closest?.('form') || null;
  return findActionButton({
    preferredSelectors: ['button[data-testid="test-primary-button"]'],
    textPattern: KIRO_CONTINUE_TEXT_PATTERN,
    formOwner: form,
  });
}

function isKiroWebHost(hostname = '') {
  const normalized = String(hostname || '').trim().toLowerCase();
  return normalized === 'app.kiro.dev'
    || normalized === 'kiro.dev';
}

function parseCurrentUrl() {
  try {
    return new URL(location.href);
  } catch (_error) {
    return null;
  }
}

function getKiroAuthPathKind() {
  const parsed = parseCurrentUrl();
  const pathname = String(parsed?.pathname || '').toLowerCase();
  if (/(^|\/)login(\/|$)/.test(pathname)) {
    return 'login';
  }
  if (/(^|\/)signup(\/|$)/.test(pathname)) {
    return 'signup';
  }
  return '';
}

function findBuilderIdButton() {
  return findActionButton({
    textPattern: KIRO_BUILDER_ID_TEXT_PATTERN,
  });
}

function isKiroWebSignedInPage(pageText = '') {
  const parsedUrl = parseCurrentUrl();
  const pathname = String(parsedUrl?.pathname || '').replace(/\/+$/, '') || '/';
  const authStatus = String(parsedUrl?.searchParams?.get('auth_status') || '').trim().toLowerCase();
  if (authStatus === 'success') {
    return true;
  }
  if (pathname !== '/signin') {
    return true;
  }
  return /signed\s*in|authorization\s*successful|登录成功|已登录|授权成功/i.test(pageText);
}

function getAuthorizationActionKind(text = '') {
  if (KIRO_CONFIRM_CONTINUE_TEXT_PATTERN.test(text)) {
    return 'confirm_continue';
  }
  if (KIRO_ALLOW_ACCESS_TEXT_PATTERN.test(text)) {
    return 'allow_access';
  }
  return 'unknown';
}

function findAuthorizationActionButton() {
  return findActionButton({
    preferredSelectors: [
      'button[data-testid="confirm-button"]',
      'button[data-testid="allow-access-button"]',
    ],
    textPattern: /confirm and continue|allow access|确认并继续|允许访问/i,
  });
}

function isKiroAwsAuthHost(hostname = '') {
  const normalized = String(hostname || '').trim().toLowerCase();
  return normalized === 'view.awsapps.com'
    || normalized === 'login.awsapps.com'
    || normalized === 'profile.aws.amazon.com'
    || normalized === 'profile.aws'
    || normalized.endsWith('.profile.aws.amazon.com')
    || normalized.endsWith('.profile.aws')
    || normalized === 'signin.aws.amazon.com'
    || normalized === 'signin.aws'
    || normalized.endsWith('.signin.aws.amazon.com')
    || normalized.endsWith('.signin.aws');
}

function detectKiroFatalPageState(pageText = '', currentUrl = '', pageTitle = '') {
  const combinedText = `${pageTitle} ${pageText}`.replace(/\s+/g, ' ').trim();
  const normalizedHost = String(location.hostname || '').trim().toLowerCase();
  const isKiroAuthHost = isKiroAwsAuthHost(normalizedHost);
  const matchedSignals = [
    /403 error/i.test(combinedText),
    /the request could not be satisfied/i.test(combinedText),
    /generated by cloudfront/i.test(combinedText),
  ].filter(Boolean).length;

  if (isKiroAuthHost && KIRO_AWS_REQUEST_ERROR_TEXT_PATTERN.test(combinedText)) {
    return {
      state: 'proxy_error_page',
      url: currentUrl,
      fatalMessage: 'Kiro 注册页出现 AWS 请求异常，通常是当前代理 IP 或出口区域异常，请先切换代理后再重试。',
    };
  }

  if (matchedSignals >= 2 || (isKiroAuthHost && matchedSignals >= 1 && KIRO_CLOUDFRONT_403_TEXT_PATTERN.test(combinedText))) {
    return {
      state: 'cloudfront_403_page',
      url: currentUrl,
      fatalMessage: 'Kiro 注册页返回 403（CloudFront 拒绝请求），通常是当前代理 IP 或区域触发了 AWS 风控，请更换代理后重试。',
    };
  }

  return null;
}

function isKiroFatalState(state = '') {
  return state === 'cloudfront_403_page'
    || state === 'proxy_error_page';
}

function getKiroFatalStateMessage(snapshot = {}) {
  if (snapshot?.fatalMessage) {
    return snapshot.fatalMessage;
  }
  switch (snapshot?.state) {
    case 'cloudfront_403_page':
      return 'Kiro 注册页返回 403（CloudFront 拒绝请求），通常是当前代理 IP 或区域触发了 AWS 风控，请更换代理后重试。';
    case 'proxy_error_page':
      return 'Kiro 注册页出现 AWS 请求异常，通常是当前代理 IP 或出口区域异常，请先切换代理后再重试。';
    default:
      return `Kiro 页面出现异常状态：${snapshot?.state || 'unknown'}`;
  }
}

function detectKiroRegisterPageState() {
  const pageText = getKiroPageText();
  const currentUrl = location.href;
  const authPathKind = getKiroAuthPathKind();
  const pageEmail = findKiroPageAccountEmail(pageText);
  const fatalState = detectKiroFatalPageState(pageText, currentUrl, document.title || '');
  if (fatalState) {
    return fatalState;
  }

  if (isKiroWebHost(location.hostname || '')) {
    const builderIdButton = findBuilderIdButton();
    if (builderIdButton) {
      return {
        state: 'kiro_signin_page',
        url: currentUrl,
        email: pageEmail,
        accountEmail: pageEmail,
        actionButton: builderIdButton,
        actionText: getElementActionText(builderIdButton),
      };
    }
    if (isKiroWebSignedInPage(pageText)) {
      const accountEmail = findKiroSignedInAccountEmail(pageText);
      return {
        state: 'kiro_web_signed_in',
        url: currentUrl,
        accountEmail,
        email: accountEmail,
      };
    }
  }

  const passwordFields = findKiroPasswordFields();
  if (passwordFields.passwordInput) {
    const passwordInput = passwordFields.passwordInput;
    const isLoginPasswordPage = authPathKind === 'login'
      || (!passwordFields.confirmPasswordInput && KIRO_SIGN_IN_TEXT_PATTERN.test(pageText));
    return {
      state: isLoginPasswordPage ? 'login_password_page' : 'create_password_page',
      url: currentUrl,
      email: pageEmail,
      accountEmail: pageEmail,
      passwordInput,
      confirmPasswordInput: passwordFields.confirmPasswordInput,
      continueButton: findPasswordContinueButton(passwordInput),
    };
  }

  const authorizationButton = findAuthorizationActionButton();
  if (authorizationButton) {
    const authorizationActionText = getElementActionText(authorizationButton);
    return {
      state: 'authorization_page',
      url: currentUrl,
      email: pageEmail,
      accountEmail: pageEmail,
      actionButton: authorizationButton,
      authorizationActionKind: getAuthorizationActionKind(authorizationActionText),
      authorizationActionText,
    };
  }

  if (
    KIRO_SUCCESS_TEXT_PATTERN.test(pageText)
    || /request approved|access your data|请求已批准|访问你的数据/i.test(pageText)
  ) {
    return {
      state: 'success_page',
      url: currentUrl,
      email: pageEmail,
      accountEmail: pageEmail,
    };
  }

  const otpInput = findVisibleOtpInput();
  if (otpInput) {
    return {
      state: authPathKind === 'login' ? 'login_otp_page' : 'register_otp_page',
      url: currentUrl,
      email: pageEmail,
      accountEmail: pageEmail,
      otpInput,
      verifyButton: findOtpVerifyButton(otpInput),
      resendButton: findOtpResendButton(otpInput),
      codeInvalid: KIRO_CODE_INVALID_TEXT_PATTERN.test(pageText),
    };
  }

  const nameInput = findVisibleNameInput();
  if (nameInput) {
    return {
      state: 'name_entry',
      url: currentUrl,
      email: pageEmail,
      accountEmail: pageEmail,
      nameInput,
      continueButton: findNameContinueButton(nameInput),
    };
  }

  const emailInput = findVisibleEmailInput();
  if (emailInput) {
    return {
      state: 'email_entry',
      url: currentUrl,
      email: pageEmail,
      accountEmail: pageEmail,
      emailInput,
      continueButton: findEmailContinueButton(emailInput),
    };
  }

  return {
    state: 'loading',
    url: currentUrl,
    email: pageEmail,
    accountEmail: pageEmail,
  };
}

async function waitForKiroState(predicate, options = {}) {
  const timeoutMs = Math.max(1000, Math.floor(Number(options.timeoutMs) || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS));
  const retryDelayMs = Math.max(100, Math.floor(Number(options.retryDelayMs) || 250));
  const start = Date.now();

  while (Date.now() - start < timeoutMs) {
    throwIfStopped();
    const detected = detectKiroRegisterPageState();
    if (isKiroFatalState(detected.state)) {
      throw new Error(getKiroFatalStateMessage(detected));
    }
    if (predicate(detected)) {
      return detected;
    }
    await sleep(retryDelayMs);
  }

  const finalState = detectKiroRegisterPageState();
  if (isKiroFatalState(finalState.state)) {
    throw new Error(getKiroFatalStateMessage(finalState));
  }
  throw new Error(options.timeoutMessage || `等待 Kiro 页面状态超时：${finalState.state}`);
}

async function ensureKiroRegisterPageState(payload = {}) {
  const targetStates = Array.isArray(payload?.targetStates)
    ? payload.targetStates.map((entry) => String(entry || '').trim()).filter(Boolean)
    : [];
  if (!targetStates.length) {
    throw new Error('缺少 Kiro 目标页面状态。');
  }

  return waitForKiroState(
    (detected) => targetStates.includes(detected.state),
    {
      timeoutMs: payload?.timeoutMs,
      retryDelayMs: payload?.retryDelayMs,
      timeoutMessage: payload?.timeoutMessage || `等待 Kiro 页面进入 ${targetStates.join(' / ')} 超时，当前页面：${location.href}`,
    }
  );
}

async function waitForKiroRegisterStateChange(payload = {}) {
  const fromStates = Array.isArray(payload?.fromStates)
    ? payload.fromStates.map((entry) => String(entry || '').trim()).filter(Boolean)
    : [];
  if (!fromStates.length) {
    throw new Error('缺少 Kiro 原始页面状态。');
  }

  return waitForKiroState(
    (detected) => {
      if (detected.state === 'loading') {
        return false;
      }
      if (payload?.returnOnCodeInvalid && detected.state === 'register_otp_page' && detected.codeInvalid) {
        return true;
      }
      return !fromStates.includes(detected.state);
    },
    {
      timeoutMs: payload?.timeoutMs,
      retryDelayMs: payload?.retryDelayMs,
      timeoutMessage: payload?.timeoutMessage || `等待 Kiro 页面离开 ${fromStates.join(' / ')} 超时，当前页面：${location.href}`,
    }
  );
}

async function waitForKiroAuthorizationAdvance(previousState = {}, options = {}) {
  return waitForKiroState(
    (detected) => {
      if (detected.state === 'success_page' || detected.state === 'kiro_web_signed_in') {
        return true;
      }
      if (detected.state !== 'authorization_page') {
        return false;
      }
      const previousKind = String(previousState?.authorizationActionKind || '').trim();
      const previousText = String(previousState?.authorizationActionText || '').trim();
      const previousUrl = String(previousState?.url || '').trim();
      const nextKind = String(detected.authorizationActionKind || '').trim();
      const nextText = String(detected.authorizationActionText || '').trim();
      return nextKind !== previousKind
        || nextText !== previousText
        || String(detected.url || '').trim() !== previousUrl;
    },
    {
      timeoutMs: options.timeoutMs,
      retryDelayMs: options.retryDelayMs,
      timeoutMessage: options.timeoutMessage || `等待 Kiro 授权页进入下一步超时：${location.href}`,
    }
  );
}

async function selectKiroBuilderId() {
  const readyState = await ensureKiroRegisterPageState({
    targetStates: ['kiro_signin_page'],
    timeoutMs: DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
    retryDelayMs: 250,
  });
  if (!readyState.actionButton) {
    throw new Error('Kiro 官方登录页未找到 Builder ID 登录按钮。');
  }
  simulateClick(readyState.actionButton);
  return {
    submitted: true,
    state: 'builder_id_selected',
    url: location.href,
    actionText: readyState.actionText || '',
  };
}

async function submitKiroEmail(payload = {}) {
  const email = String(payload?.email || '').trim();
  if (!email) {
    throw new Error('缺少 Kiro 注册邮箱，无法继续提交。');
  }

  const readyState = await ensureKiroRegisterPageState({
    targetStates: ['email_entry'],
    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
    retryDelayMs: payload?.retryDelayMs || 250,
  });
  if (!readyState.emailInput || !readyState.continueButton) {
    throw new Error('Kiro 邮箱页未找到可用的输入框或继续按钮。');
  }

  fillInput(readyState.emailInput, email);
  await sleep(200);
  simulateClick(readyState.continueButton);
  return {
    submitted: true,
    state: 'email_submitted',
    url: location.href,
  };
}

async function submitKiroName(payload = {}) {
  const fullName = String(payload?.fullName || '').trim();
  if (!fullName) {
    throw new Error('缺少 Kiro 注册姓名，无法继续提交。');
  }

  const readyState = await ensureKiroRegisterPageState({
    targetStates: ['name_entry'],
    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
    retryDelayMs: payload?.retryDelayMs || 250,
  });
  if (!readyState.nameInput || !readyState.continueButton) {
    throw new Error('Kiro 姓名页未找到可用的输入框或继续按钮。');
  }

  fillInput(readyState.nameInput, fullName);
  await sleep(200);
  simulateClick(readyState.continueButton);
  return {
    submitted: true,
    state: 'name_submitted',
    url: location.href,
  };
}

async function submitKiroVerificationCode(payload = {}) {
  const code = String(payload?.code || '').trim();
  if (!code) {
    throw new Error('缺少 Kiro 邮箱验证码，无法继续提交。');
  }

  const readyState = await ensureKiroRegisterPageState({
    targetStates: ['register_otp_page'],
    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
    retryDelayMs: payload?.retryDelayMs || 250,
  });
  if (!readyState.otpInput || !readyState.verifyButton) {
    throw new Error('Kiro 验证码页未找到可用的输入框或继续按钮。');
  }

  fillInput(readyState.otpInput, code);
  await sleep(200);
  simulateClick(readyState.verifyButton);
  return {
    submitted: true,
    state: 'verification_submitted',
    url: location.href,
  };
}

async function submitKiroPassword(payload = {}) {
  const password = String(payload?.password || '');
  if (!password) {
    throw new Error('缺少 Kiro 账户密码，无法继续提交。');
  }

  const readyState = await ensureKiroRegisterPageState({
    targetStates: ['create_password_page'],
    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
    retryDelayMs: payload?.retryDelayMs || 250,
  });
  if (!readyState.passwordInput || !readyState.continueButton) {
    throw new Error('Kiro 密码页未找到可用的密码框或继续按钮。');
  }

  fillInput(readyState.passwordInput, password);
  await sleep(150);
  if (String(readyState.passwordInput.value || '') !== password) {
    throw new Error('Kiro \u5bc6\u7801\u9875\u4e3b\u5bc6\u7801\u6846\u586b\u5165\u5931\u8d25\uff0c\u5df2\u505c\u6b62\u63d0\u4ea4\uff0c\u8bf7\u68c0\u67e5\u9875\u9762\u5b57\u6bb5\u7ed3\u6784\u3002');
  }

  const confirmPasswordInput = readyState.confirmPasswordInput
    || (() => {
      const passwordInputs = findVisiblePasswordInputs();
      return passwordInputs.find((input) => input !== readyState.passwordInput) || null;
    })();
  if (confirmPasswordInput && confirmPasswordInput !== readyState.passwordInput) {
    fillInput(confirmPasswordInput, password);
    await sleep(150);
    if (String(confirmPasswordInput.value || '') !== password) {
      throw new Error('Kiro \u5bc6\u7801\u9875\u786e\u8ba4\u5bc6\u7801\u6846\u586b\u5165\u5931\u8d25\uff0c\u5df2\u505c\u6b62\u63d0\u4ea4\uff0c\u8bf7\u68c0\u67e5\u9875\u9762\u5b57\u6bb5\u7ed3\u6784\u3002');
    }
  }

  if (
    confirmPasswordInput
    && confirmPasswordInput !== readyState.passwordInput
    && String(confirmPasswordInput.value || '') !== String(readyState.passwordInput.value || '')
  ) {
    throw new Error('Kiro \u5bc6\u7801\u9875\u4e24\u4e2a\u5bc6\u7801\u6846\u5185\u5bb9\u4e0d\u4e00\u81f4\uff0c\u5df2\u505c\u6b62\u63d0\u4ea4\u3002');
  }

  simulateClick(readyState.continueButton);
  return {
    submitted: true,
    state: 'password_submitted',
    url: location.href,
  };
}

async function confirmKiroRegisterConsent(payload = {}) {
  let currentState = await ensureKiroRegisterPageState({
    targetStates: ['authorization_page', 'success_page', 'kiro_web_signed_in'],
    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
    retryDelayMs: payload?.retryDelayMs || 250,
  });

  const maxActions = Math.max(1, Math.min(4, Number(payload?.maxActions) || 3));
  const actions = [];
  while (currentState.state === 'authorization_page' && actions.length < maxActions) {
    if (!currentState.actionButton) {
      throw new Error('Kiro 授权页未找到可用的授权按钮。');
    }

    actions.push({
      kind: currentState.authorizationActionKind || 'unknown',
      text: currentState.authorizationActionText || getElementActionText(currentState.actionButton),
    });
    simulateClick(currentState.actionButton);
    currentState = await waitForKiroAuthorizationAdvance(currentState, {
      timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
      retryDelayMs: payload?.retryDelayMs || 250,
      timeoutMessage: 'Kiro 授权按钮点击后页面未继续，请检查当前授权页状态。',
    });
  }

  if (currentState.state !== 'success_page' && currentState.state !== 'kiro_web_signed_in') {
    throw new Error('Kiro 授权页未完成确认访问流程。');
  }

  return {
    submitted: true,
    state: currentState.state,
    url: currentState.url || location.href,
    actions,
  };
}

async function handleKiroRegisterCommand(message) {
  switch (message.type) {
    case 'GET_KIRO_REGISTER_PAGE_STATE': {
      const detected = detectKiroRegisterPageState();
      return {
        state: detected?.state || '',
        url: detected?.url || location.href,
        accountEmail: detected?.accountEmail || '',
        email: detected?.email || detected?.accountEmail || '',
        fatalMessage: detected?.fatalMessage || '',
        authorizationActionKind: detected?.authorizationActionKind || '',
        authorizationActionText: detected?.authorizationActionText || '',
        actionText: detected?.actionText || '',
        codeInvalid: Boolean(detected?.codeInvalid),
      };
    }
    case 'ENSURE_KIRO_PAGE_STATE':
      return ensureKiroRegisterPageState(message.payload || {});
    case 'ENSURE_KIRO_STATE_CHANGE':
      return waitForKiroRegisterStateChange(message.payload || {});
    case 'EXECUTE_NODE': {
      const nodeId = String(message.nodeId || message.payload?.nodeId || '').trim();
      if (nodeId === 'kiro-open-register-page') {
        return selectKiroBuilderId();
      }
      if (nodeId === 'kiro-submit-email') {
        return submitKiroEmail(message.payload || {});
      }
      if (nodeId === 'kiro-submit-name') {
        return submitKiroName(message.payload || {});
      }
      if (nodeId === 'kiro-submit-verification-code') {
        return submitKiroVerificationCode(message.payload || {});
      }
      if (nodeId === 'kiro-submit-password') {
        return submitKiroPassword(message.payload || {});
      }
      if (nodeId === 'kiro-complete-register-consent') {
        return confirmKiroRegisterConsent(message.payload || {});
      }
      throw new Error(`register-page.js 不处理节点：${nodeId}`);
    }
    default:
      return null;
  }
}

if (document.documentElement.getAttribute(KIRO_REGISTER_PAGE_LISTENER_SENTINEL) !== '1') {
  document.documentElement.setAttribute(KIRO_REGISTER_PAGE_LISTENER_SENTINEL, '1');
  chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
    if (
      message.type === 'ENSURE_KIRO_PAGE_STATE'
      || message.type === 'ENSURE_KIRO_STATE_CHANGE'
      || message.type === 'GET_KIRO_REGISTER_PAGE_STATE'
      || message.type === 'EXECUTE_NODE'
    ) {
      resetStopState();
      handleKiroRegisterCommand(message)
        .then((result) => {
          sendResponse({ ok: true, ...(result || {}) });
        })
        .catch((error) => {
          if (isStopError(error)) {
            sendResponse({ stopped: true, error: error.message });
            return;
          }
          sendResponse({ error: error?.message || String(error || '未知错误') });
        });
      return true;
    }
    return false;
  });
}