export const MINDSPACE_PAGE_TAG_ATTR = 'data-mindspace-page-tag';
export const MINDSPACE_PAGE_TAG_PLATFORM_BRAND = 'platform-brand';
export const PLATFORM_BRAND_TEXT = 'TKMind · 智趣';

const PLATFORM_BRAND_INNER_RE = /(?:TKMind\s*·\s*智趣|contact@tkmind\.(?:ai|cn)|📧[^<]*tkmind)/i;
const SIMPLE_BRAND_ELEMENT_RE =
  /<(p|div|span|small|footer|a)(\s[^>]*)?>([^<]*(?:TKMind\s*·\s*智趣|contact@tkmind\.(?:ai|cn)|📧[^<]*tkmind)[^<]*)<\/\1>/gi;

export function normalizePlatformDomainText(text) {
  return String(text ?? '').replace(/tkmind\.ai/gi, 'tkmind.cn');
}

export function normalizePlatformBrandHtml(html) {
  let next = normalizePlatformDomainText(html);
  next = next.replace(/mailto:([^"'>\s]+@tkmind)\.ai/gi, 'mailto:$1.cn');
  next = next.replace(/https?:\/\/([a-z0-9.-]*\.)?tkmind\.ai/gi, (match) =>
    match.replace(/tkmind\.ai/gi, 'tkmind.cn'),
  );
  next = next.replace(/(?:📧\s*)?contact@tkmind\.cn/gi, PLATFORM_BRAND_TEXT);
  return next;
}

export function ensurePlatformBrandPageTags(html) {
  const normalized = normalizePlatformBrandHtml(html);
  return normalized.replace(SIMPLE_BRAND_ELEMENT_RE, (match, tag, attrs, inner) => {
    const attrStr = attrs ?? '';
    if (attrStr.includes(MINDSPACE_PAGE_TAG_ATTR)) return match;
    if (!PLATFORM_BRAND_INNER_RE.test(inner)) return match;
    const spacer = attrStr ? '' : ' ';
    return `<${tag}${attrStr}${spacer}${MINDSPACE_PAGE_TAG_ATTR}="${MINDSPACE_PAGE_TAG_PLATFORM_BRAND}">${inner}</${tag}>`;
  });
}

export function prepareHtmlPageBrandMarkers(html) {
  return ensurePlatformBrandPageTags(html);
}