function cleanText(value) {
  return String(value || '')
    .replace(/\s+/g, ' ')
    .replace(/\u200b/g, '')
    .trim();
}

function pageText() {
  const body = document.body;
  return cleanText(body && (body.innerText || body.textContent || ''));
}

function isLoginBlocked(url, text) {
  return /\/signin\b|\/signup\b/.test(url) ||
    /登录|注册|验证码|安全验证|验证后继续|请先登录/.test(text);
}

function isVisible(node) {
  if (!node) {
    return false;
  }
  const rect = typeof node.getBoundingClientRect === 'function' ? node.getBoundingClientRect() : null;
  return !rect || rect.width > 0 || rect.height > 0;
}

function attrText(node, name) {
  if (!node || typeof node.getAttribute !== 'function') {
    return '';
  }
  return cleanText(node.getAttribute(name) || '');
}

function looksLikeTitleInput(node) {
  const signals = [
    attrText(node, 'placeholder'),
    attrText(node, 'data-placeholder'),
    attrText(node, 'aria-label'),
  ].filter(Boolean);
  return signals.some((value) => value.includes('标题'));
}

function findVisibleTitleInput() {
  const selectors = [
    "textarea[placeholder*='标题']",
    "input[placeholder*='标题']",
    "textarea[data-placeholder*='标题']",
    "input[data-placeholder*='标题']",
    "[role='textbox'][aria-label*='标题']",
    "[contenteditable='true'][aria-label*='标题']",
    "[contenteditable='true'][data-placeholder*='标题']",
  ];
  for (const selector of selectors) {
    const node = document.querySelector(selector);
    if (isVisible(node)) {
      return node;
    }
  }
  return null;
}

function findBodyEditor(titleInput) {
  const selectors = [
    "div[contenteditable='true'][role='textbox']",
    "div.public-DraftEditor-content[contenteditable='true']",
    "[role='textbox'][contenteditable='true']",
    "[contenteditable='true'][data-placeholder]",
    "div[contenteditable='true']",
  ];
  for (const selector of selectors) {
    const nodes = Array.from(document.querySelectorAll(selector));
    const visible = nodes.find((node) => {
      return isVisible(node) && node !== titleInput && !looksLikeTitleInput(node);
    });
    if (visible) {
      return visible;
    }
  }
  return null;
}

const currentUrl = location.href;
const text = pageText();

if (isLoginBlocked(currentUrl, text)) {
  return {
    status: 'login_required',
    current_url: currentUrl,
  };
}

const titleInput = findVisibleTitleInput();
const bodyEditor = findBodyEditor(titleInput);

if (titleInput && bodyEditor) {
  return {
    status: 'editor_ready',
    current_url: currentUrl,
    title_placeholder: titleInput.getAttribute('placeholder') || '',
  };
}

return {
  status: 'editor_unavailable',
  current_url: currentUrl,
  desired_mode: String(args.desired_mode || 'draft'),
};