import { extractPageTitle } from './wechat/verify/share-preview-repair.mjs';
import { isWeakNewsMorningImageUrl } from './wechat-news-morning-images.mjs';

const MAX_WECHAT_CONTENT_CHARS = 20000;
const MAX_WECHAT_CONTENT_TARGET_CHARS = 19600;
const DEFAULT_PORTAL_URL = 'https://m.tkmind.cn';
const FOLLOW_QRCODE_SIZE_PX = 120;

/**
 * 公众号正文只保留内联 style，微信会 strip <style> 块。
 * flex 在部分微信版本会被降级，两列统一用 inline-block + vertical-align。
 */
const BRAND = Object.freeze({
  red: '#c8102e',
  redDeep: '#9b0c22',
  navy: '#0d2b5c',
  navyMid: '#1a4a8a',
  navySoft: '#3a5f92',
  ink: '#222',
  body: '#555',
  muted: '#999',
  faint: '#ccc',
  hair: '#e8e8e8',
  line: '#eee',
  tintRed: '#fff5f6',
  tintBlue: '#f4f8ff',
  onDark: '#f6e9eb',
  onDarkSoft: '#e8c2c8',
});

/** 紧凑 inline 样式，降低 HTML 开销以便在 2 万字内塞入更多资讯条。 */
const WX = Object.freeze({
  hero: `background:linear-gradient(135deg,${BRAND.red},${BRAND.navy});border-radius:14px;padding:22px 16px 20px;text-align:center;color:#fff`,
  heroTitle: 'margin:0;font-size:24px;font-weight:700;line-height:1.35',
  heroMeta: `margin:8px 0 0;font-size:12px;color:${BRAND.onDark}`,
  heroSub: `margin:12px 0 0;font-size:12px;line-height:1.8;color:${BRAND.onDark};text-align:left`,
  digest: `margin:12px 0 0;background:${BRAND.tintRed};border-radius:10px;padding:12px 14px`,
  digestLabel: `margin:0 0 6px;font-size:11px;font-weight:700;color:${BRAND.red}`,
  digestBody: `margin:0;font-size:12px;color:${BRAND.body};line-height:1.85`,
  section: `margin:20px 0 10px;padding-bottom:6px;border-bottom:1px solid ${BRAND.line};font-size:16px;font-weight:700;color:${BRAND.ink}`,
  feature: 'margin:0 0 12px;border-radius:12px;padding:14px 14px 12px;color:#fff',
  featureTag: `margin:0 0 6px;font-size:10px;color:${BRAND.onDarkSoft}`,
  featureTitle: 'margin:0;font-size:15px;font-weight:700;line-height:1.5',
  featureBody: `margin:8px 0 0;font-size:13px;line-height:1.75;color:${BRAND.onDark}`,
  listWrap: 'margin:0 0 12px',
  listTitle: `margin:0;font-size:14px;font-weight:700;color:${BRAND.ink};line-height:1.5`,
  listBody: `margin:5px 0 0;font-size:13px;color:${BRAND.body};line-height:1.75`,
  compactWrap: 'margin:0 0 12px',
  compactThumb: 'display:inline-block;vertical-align:top;width:72px;margin-right:10px',
  compactThumbImg: 'display:block;width:72px;height:54px;object-fit:cover;border-radius:8px',
  compactBody: 'display:inline-block;vertical-align:top;width:calc(100% - 82px);max-width:calc(100% - 82px)',
  compactTag: `margin:0 0 4px;font-size:10px;font-weight:700;color:${BRAND.red}`,
  compactLeadTitle: `margin:0;font-size:15px;font-weight:700;color:${BRAND.ink};line-height:1.5`,
  rankWrap: `margin:0 0 12px;background:${BRAND.tintRed};border-radius:10px;padding:12px 12px 8px`,
  rankTitle: `margin:0 0 8px;font-size:14px;font-weight:700;color:${BRAND.ink};line-height:1.5`,
  rankBody: `margin:0;font-size:13px;color:${BRAND.body};line-height:1.85`,
});

const SECTION_LABELS = {
  headlines: 'TOP NEWS',
  weather: 'WEATHER',
  world: 'WORLD',
  domestic: 'CHINA',
  google: 'GLOBAL',
  x: 'SOCIAL',
  asia_pacific: 'ASIA',
  commodities: 'ENERGY',
  ai_chips: 'AI',
  policy: 'POLICY',
  universities: 'CAMPUS',
  global_markets: 'MARKETS',
  community: 'COMMUNITY',
  science: 'SCIENCE',
  culture: 'CULTURE',
  startup: 'STARTUP',
  crypto: 'CRYPTO',
  geopolitics: 'GEOPOL',
  local_life: 'CITIES',
  official_feeds: 'WIRE',
  finance: 'FINANCE',
  tech: 'TECH',
  technews: 'TECH',
  sports: 'SPORTS',
  knowledge: 'INSIGHT',
};

const FEATURE_CARD_THEMES = {
  'highlight-box': `linear-gradient(135deg,${BRAND.red},${BRAND.redDeep})`,
  'highlight-box-orange': `linear-gradient(135deg,${BRAND.red},${BRAND.redDeep} 70%,#7d0a1c)`,
  'highlight-box-gold': `linear-gradient(135deg,${BRAND.navy},${BRAND.navyMid})`,
  'highlight-box-blue': `linear-gradient(135deg,${BRAND.navy},${BRAND.navyMid})`,
  'highlight-box-teal': `linear-gradient(135deg,${BRAND.navy},#123a6b)`,
};

function extractMetaDescription(html) {
  const match = String(html ?? '').match(
    /<meta[^>]+name=["']description["'][^>]+content=["']([^"']*)["']/i,
  );
  return match?.[1]?.trim() ?? '';
}

function stripScripts(html) {
  return String(html ?? '').replace(/<script[\s\S]*?<\/script>/gi, '');
}

function sanitizeInlineHtml(html) {
  return stripScripts(String(html ?? ''))
    .replace(/<(?!\/?(a\b|br\b|strong\b|span\b|b\b|em\b|i\b)\b)[^>]+>/gi, '')
    .replace(/\son\w+="[^"]*"/gi, '')
    .trim();
}

function extractInnerHtml(block, pattern) {
  const match = String(block ?? '').match(pattern);
  return match?.[1] ? sanitizeInlineHtml(match[1]) : '';
}

function extractBodyInner(html) {
  return String(html ?? '').match(/<body[^>]*>([\s\S]*?)<\/body>/i)?.[1] ?? String(html ?? '');
}

function stripInlineText(value) {
  return sanitizeInlineHtml(String(value ?? ''))
    .replace(/<span class="icon"[^>]*>([\s\S]*?)<\/span>/gi, '$1')
    .replace(/<[^>]+>/g, '')
    .replace(/\s+/g, ' ')
    .trim();
}

function truncatePlainText(value, maxChars) {
  const text = String(value ?? '').replace(/\s+/g, ' ').trim();
  if (!maxChars || text.length <= maxChars) return text;
  return `${text.slice(0, Math.max(0, maxChars - 1))}…`;
}

function extractDivBlock(html, className) {
  const source = String(html ?? '');
  const openRe = new RegExp(`<div class="${className}"[^>]*>`, 'i');
  const openMatch = openRe.exec(source);
  if (!openMatch) return '';
  let pos = openMatch.index + openMatch[0].length;
  let depth = 1;
  while (pos < source.length && depth > 0) {
    const nextOpen = source.indexOf('<div', pos);
    const nextClose = source.indexOf('</div>', pos);
    if (nextClose === -1) break;
    if (nextOpen !== -1 && nextOpen < nextClose) {
      depth += 1;
      pos = nextOpen + 4;
    } else {
      depth -= 1;
      pos = nextClose + 6;
    }
  }
  return source.slice(openMatch.index, pos);
}

function extractClassDivBlocks(parentHtml, classPrefix) {
  const source = String(parentHtml ?? '');
  const blocks = [];
  const openRe = new RegExp(`<div class="${classPrefix}[^"]*"[^>]*>`, 'gi');
  let openMatch = openRe.exec(source);
  while (openMatch) {
    let pos = openMatch.index + openMatch[0].length;
    let depth = 1;
    while (pos < source.length && depth > 0) {
      const nextOpen = source.indexOf('<div', pos);
      const nextClose = source.indexOf('</div>', pos);
      if (nextClose === -1) break;
      if (nextOpen !== -1 && nextOpen < nextClose) {
        depth += 1;
        pos = nextOpen + 4;
      } else {
        depth -= 1;
        pos = nextClose + 6;
      }
    }
    blocks.push(source.slice(openMatch.index, pos));
    openMatch = openRe.exec(source);
  }
  return blocks;
}

function extractHistoryItemBlocks(parentHtml) {
  const source = String(parentHtml ?? '');
  const blocks = [];
  const re = /<(?:div|li)\s+class="history-item[^"]*"[^>]*>[\s\S]*?<\/(?:div|li)>/gi;
  let match = re.exec(source);
  while (match) {
    blocks.push(match[0]);
    match = re.exec(source);
  }
  return blocks;
}

function isNews002Html(html) {
  const source = String(html ?? '');
  if (/\bclass="[^"]*\bmasthead\b/u.test(source)) return true;
  return /\bclass="[^"]*\blead-card\b/u.test(source) && !/\bclass="hero\b/u.test(source);
}

/** feature=渐变头条卡，rank=多行榜单卡，list=带序号的列表条目，lead=news002 头条小图卡。 */
function classifyCard(cardHtml, { news002Mode = false } = {}) {
  if (news002Mode && /\blead-card\b/u.test(cardHtml)) return 'lead';
  if (detectFeatureTheme(cardHtml, { news002Mode })) return 'feature';
  const rawBody = extractInnerHtml(cardHtml, /<p[^>]*>([\s\S]*?)<\/p>/i);
  return /<br\s*\/?>/i.test(rawBody) ? 'rank' : 'list';
}

function detectFeatureTheme(cardHtml, { news002Mode = false } = {}) {
  // news002 草稿与静态页统一为左上角小图，不走 news001 渐变头条卡。
  if (news002Mode && /\blead-card\b/u.test(cardHtml)) return '';
  // news002 用 .lead-card 取代 news001 的 .highlight-box 系列做头条卡。
  if (/\blead-card\b/u.test(cardHtml)) return FEATURE_CARD_THEMES['highlight-box'];
  if (/highlight-box-orange/u.test(cardHtml)) return FEATURE_CARD_THEMES['highlight-box-orange'];
  if (/highlight-box-gold/u.test(cardHtml)) return FEATURE_CARD_THEMES['highlight-box-gold'];
  if (/highlight-box-blue/u.test(cardHtml)) return FEATURE_CARD_THEMES['highlight-box-blue'];
  if (/highlight-box-teal/u.test(cardHtml)) return FEATURE_CARD_THEMES['highlight-box-teal'];
  if (/highlight-box/u.test(cardHtml)) return FEATURE_CARD_THEMES['highlight-box'];
  return '';
}

function extractTagLabel(cardHtml) {
  const match = String(cardHtml).match(/<span class="tag[^"]*"[^>]*>([\s\S]*?)<\/span>/i);
  return match ? stripInlineText(match[1]) : '';
}

function extractSourceLabel(sourceRaw, maxChars = 34) {
  const plain = String(sourceRaw ?? '')
    .replace(/<a[^>]*>([\s\S]*?)<\/a>/gi, '$1')
    .replace(/<[^>]+>/g, '')
    .replace(/^\s*来源[：:]?\s*/u, '')
    .replace(/\s+/g, ' ')
    .trim();
  const firstSource = plain.split(/\s*·\s*/u)[0] ?? plain;
  return truncatePlainText(firstSource, maxChars);
}

function formatCardIndex(index) {
  return String(index + 1).padStart(2, '0');
}

/** 榜单型卡片（含 <br> 多行），保留逐行结构而不是压成一段。 */
function renderRankListBody(bodyHtml, { maxRows = 14 } = {}) {
  if (!/<br\s*\/?>/i.test(String(bodyHtml))) return '';
  const rows = String(bodyHtml)
    .split(/<br\s*\/?>/i)
    .map((row) => sanitizeInlineHtml(row).replace(/^[\s🔥•·-]+/u, '').trim())
    .filter(Boolean)
    .slice(0, maxRows);
  if (rows.length < 3) return '';
  // 整段用一个 <p> + <br> 分行，逐行独立 <p> 会多出几百字符的样式开销。
  const lines = rows
    .map((row, index) => {
      const text = row.replace(/<\/?(?:span|em|i|b)[^>]*>/gi, '');
      return `<span style="color:${BRAND.red};font-weight:700">${String(index + 1).padStart(2, '0')}</span> ${text}`;
    })
    .join('<br>');
  return `<p style="${WX.rankBody}">${lines}</p>`;
}

function renderFeatureCard(cardHtml, { theme, title, body, imageUrl = '' }) {
  const tag = extractTagLabel(cardHtml);
  return [
    `<section style="${WX.feature};background:${theme};overflow:hidden">`,
    imageUrl
      ? `<img src="${imageUrl}" alt="${stripInlineText(title)}" style="display:block;width:calc(100% + 28px);max-width:none;height:auto;margin:-14px -14px 12px" />`
      : '',
    tag ? `<p style="${WX.featureTag}">${tag}</p>` : '',
    `<p style="${WX.featureTitle}"><strong>${title}</strong></p>`,
    body ? `<p style="${WX.featureBody}">${body}</p>` : '',
    '</section>',
  ].filter(Boolean).join('');
}

function renderListCard({ title, body, index, imageUrl = '' }) {
  const thumb = imageUrl
    ? `<img src="${imageUrl}" alt="${stripInlineText(title)}" style="flex-shrink:0;width:92px;height:69px;object-fit:cover;border-radius:8px;display:block" />`
    : '';
  const textBlock = [
    `<p style="${WX.listTitle}"><span style="color:${BRAND.red}">${formatCardIndex(index)}</span>　<strong>${title}</strong></p>`,
    body ? `<p style="${WX.listBody}">${body}</p>` : '',
  ].filter(Boolean).join('');
  if (thumb) {
    return [
      `<section style="${WX.listWrap};display:flex;gap:10px;align-items:flex-start">`,
      thumb,
      `<div style="flex:1;min-width:0">${textBlock}</div>`,
      '</section>',
    ].join('');
  }
  return [
    `<section style="${WX.listWrap}">`,
    textBlock,
    '</section>',
  ].join('');
}

/** news002：左侧 72×54 缩略图 + 右侧标题正文，与静态页 .card/.lead-card 一致。 */
function renderNews002CompactCard({
  title,
  body,
  tag = '',
  index = 0,
  imageUrl = '',
  isLead = false,
}) {
  const thumbBlock = imageUrl
    ? [
      `<span style="${WX.compactThumb}">`,
      `<img src="${imageUrl}" alt="${stripInlineText(title)}" style="${WX.compactThumbImg}" />`,
      '</span>',
    ].join('')
    : '';
  const titleStyle = isLead ? WX.compactLeadTitle : WX.listTitle;
  const titleHtml = isLead
    ? `<p style="${titleStyle}"><strong>${title}</strong></p>`
    : `<p style="${titleStyle}"><span style="color:${BRAND.red}">${formatCardIndex(index)}</span>　<strong>${title}</strong></p>`;
  return [
    `<section style="${WX.compactWrap}">`,
    thumbBlock,
    `<span style="${thumbBlock ? WX.compactBody : 'display:block'}">`,
    tag ? `<p style="${WX.compactTag}">${tag}</p>` : '',
    titleHtml,
    body ? `<p style="${WX.listBody}">${body}</p>` : '',
    '</span>',
    '</section>',
  ].filter(Boolean).join('');
}

function renderCard(cardHtml, {
  maxBodyChars = null,
  index = 0,
  imageUrlMap = new Map(),
  news002Mode = false,
} = {}) {
  const title = extractInnerHtml(cardHtml, /<h3[^>]*>([\s\S]*?)<\/h3>/i);
  if (!title) return '';
  const rawBody = extractInnerHtml(cardHtml, /<p[^>]*>([\s\S]*?)<\/p>/i);
  const theme = detectFeatureTheme(cardHtml, { news002Mode });

  const rankBody = theme ? '' : renderRankListBody(rawBody);
  if (rankBody) {
    return [
      `<section style="${WX.rankWrap}">`,
      `<p style="${WX.rankTitle}"><strong>${stripInlineText(title)}</strong></p>`,
      rankBody,
      '</section>',
    ].join('');
  }

  const body = maxBodyChars
    ? truncatePlainText(rawBody.replace(/<[^>]+>/g, ''), maxBodyChars)
    : rawBody;
  const imageUrl = extractMappedCardImage(cardHtml, imageUrlMap);

  if (news002Mode) {
    return renderNews002CompactCard({
      title,
      body,
      tag: extractTagLabel(cardHtml),
      index,
      imageUrl,
      isLead: /\blead-card\b/u.test(cardHtml),
    });
  }

  if (theme) {
    return renderFeatureCard(cardHtml, {
      theme,
      title,
      body,
      imageUrl,
    });
  }
  return renderListCard({
    title,
    body,
    index,
    imageUrl,
  });
}

function renderSectionTitle(titleHtml, sectionId = '') {
  const text = stripInlineText(titleHtml);
  if (!text) return '';
  const label = SECTION_LABELS[sectionId] ?? '';
  const suffix = label
    ? `<span style="font-size:11px;color:${BRAND.faint};font-weight:400"> ${label}</span>`
    : '';
  return `<p style="${WX.section}"><span style="color:${BRAND.red}">▎</span>${text}${suffix}</p>`;
}

function resolveMappedImageUrl(src, imageUrlMap = new Map()) {
  const ref = String(src ?? '').trim();
  if (!ref) return '';
  return imageUrlMap.get(ref) ?? imageUrlMap.get(ref.replace(/^\.\//, '')) ?? '';
}

function extractMappedCardImage(cardHtml, imageUrlMap = new Map()) {
  const src = String(cardHtml ?? '').match(
    /<div\b[^>]*class="[^"]*\bmedia\b[^"]*"[^>]*>[\s\S]*?<img\b[^>]*src=["']([^"']+)["']/i,
  )?.[1] ?? '';
  const mapped = resolveMappedImageUrl(src, imageUrlMap);
  return mapped && !isWeakNewsMorningImageUrl(mapped) && !isWeakNewsMorningImageUrl(src) ? mapped : '';
}

function extractHeroSubtitle(html) {
  // news001 用 .subtitle，news002 用 .lede。
  const source = String(html);
  return stripInlineText(
    source.match(/<div class="subtitle"[^>]*>([\s\S]*?)<\/div>/i)?.[1]
    ?? source.match(/<div class="lede"[^>]*>([\s\S]*?)<\/div>/i)?.[1]
    ?? '',
  );
}

function extractHeroDateLine(html) {
  // news001 用 .date-badge，news002 用 .masthead .meta。
  const source = String(html);
  return stripInlineText(
    source.match(/<div class="date-badge"[^>]*>([\s\S]*?)<\/div>/i)?.[1]
    ?? source.match(/<div class="meta"[^>]*>([\s\S]*?)<\/div>/i)?.[1]
    ?? '',
  );
}

/**
 * Hero 里的摘要通常是「要点·要点·要点」的长串，拆成导读列表比整段文字好读得多。
 * 拆不出两条以上时返回空，由 Hero 继续以整段展示。
 */
function renderTodayDigest(html, { maxItems = 6, maxItemChars = 30 } = {}) {
  const raw = extractHeroSubtitle(html);
  if (!raw) return '';
  const items = raw
    .split(/\s*[·|、]\s*/u)
    .map((item) => item.trim())
    .filter((item) => item.length >= 4)
    .slice(0, maxItems)
    .map((item) => truncatePlainText(item, maxItemChars));
  if (items.length < 2) return '';
  const lines = items.map((item) => `<span style="color:${BRAND.red}">·</span> ${item}`).join('<br>');
  return [
    `<section style="${WX.digest}">`,
    `<p style="${WX.digestLabel}">今日导读</p>`,
    `<p style="${WX.digestBody}">${lines}</p>`,
    '</section>',
  ].join('');
}

function renderHero(html, _imageUrlMap = new Map(), { includeSubtitle = true } = {}) {
  const title = stripInlineText(String(html).match(/<h1[^>]*>([\s\S]*?)<\/h1>/i)?.[1] ?? '')
    || '每日新闻早报';
  const dateBadge = extractHeroDateLine(html);
  const subtitle = includeSubtitle ? truncatePlainText(extractHeroSubtitle(html), 150) : '';
  return [
    `<section style="${WX.hero}">`,
    `<p style="${WX.heroTitle}"><strong>${title.replace(/^[📰\s]+/u, '')}</strong></p>`,
    dateBadge ? `<p style="${WX.heroMeta}">${dateBadge}</p>` : '',
    subtitle ? `<p style="${WX.heroSub}">${subtitle}</p>` : '',
    '</section>',
  ].filter(Boolean).join('');
}

function renderBriefStats(entries = []) {
  const items = entries.filter((item) => item && item.value);
  if (items.length === 0) return '';
  const width = Math.floor(100 / items.length) - 1;
  const cells = items.map((item) => [
    `<section style="display:inline-block;width:${width}%;vertical-align:top">`,
    `<p style="margin:0;font-size:21px;font-weight:700;color:${BRAND.red}"><strong>${item.value}</strong></p>`,
    `<p style="margin:4px 0 0;font-size:11px;color:${BRAND.muted}">${item.label}</p>`,
    '</section>',
  ].join('')).join('');
  return `<section style="margin:14px 0 2px;padding:14px 0;border-top:1px solid ${BRAND.line};border-bottom:1px solid ${BRAND.line};text-align:center;font-size:0">${cells}</section>`;
}

const WEATHER_MAX_CITY_CARDS = 6;

/** 热门旅游城市优先序；微信天气区只展示这些城市的 weather-card。 */
const POPULAR_TOURIST_CITIES = Object.freeze([
  '北京', '上海', '广州', '深圳', '成都', '杭州', '西安', '重庆', '武汉', '南京',
  '厦门', '三亚', '青岛', '大连', '苏州', '丽江', '桂林', '福州', '海口', '长沙',
  '昆明', '哈尔滨', '沈阳', '郑州', '天津', '宁波', '无锡', '珠海', '拉萨', '乌鲁木齐',
  '泉州', '南昌', '济南', '合肥', '南宁', '贵阳', '兰州', '西宁', '银川', '呼和浩特',
  '漳州', '梅州', '东莞', '佛山', '温州', '绍兴', '黄山', '张家界', '敦煌', '秦皇岛',
]);

const POPULAR_TOURIST_CITY_INDEX = new Map(
  POPULAR_TOURIST_CITIES.map((city, index) => [city, index]),
);

const REGION_WEATHER_NAME_RE = /(西部|东部|南部|北部|大部|地区|区域|平原|流域|棉区|秋收|华南|华北|江汉|西南|江南|黄淮|西北|东北|概况)/u;

function normalizeWeatherCityLabel(raw) {
  return stripInlineText(String(raw ?? ''))
    .replace(/^📍\s*/u, '')
    .split(/[·•]/u)[0]
    .replace(/市$/u, '')
    .trim();
}

function isPopularTouristCityName(raw) {
  const city = normalizeWeatherCityLabel(raw);
  if (!city || city.length > 6 || REGION_WEATHER_NAME_RE.test(city)) return false;
  return POPULAR_TOURIST_CITY_INDEX.has(city);
}

function extractWeatherCityName(cardHtml) {
  const fromLegacy = normalizeWeatherCityLabel(
    extractInnerHtml(cardHtml, /<span class="w-city">([\s\S]*?)<\/span>/i),
  );
  if (fromLegacy) return fromLegacy;
  return normalizeWeatherCityLabel(
    extractInnerHtml(cardHtml, /<div class="wc">([\s\S]*?)<\/div>/i),
  );
}

function extractWeatherCondAndTemp(cardHtml) {
  const cond = stripInlineText(extractInnerHtml(cardHtml, /<span class="w-cond">([\s\S]*?)<\/span>/i))
    || stripInlineText(extractInnerHtml(cardHtml, /<div class="we">([\s\S]*?)<\/div>/i));
  const temp = stripInlineText(extractInnerHtml(cardHtml, /<span class="w-temp">([\s\S]*?)<\/span>/i))
    || stripInlineText(extractInnerHtml(cardHtml, /<div class="wt">([\s\S]*?)<\/div>/i));
  return { cond, temp };
}

function selectTouristWeatherCards(cards = []) {
  return cards
    .filter((card) => isPopularTouristCityName(extractWeatherCityName(card)))
    .sort((left, right) => {
      const leftIndex = POPULAR_TOURIST_CITY_INDEX.get(extractWeatherCityName(left)) ?? 999;
      const rightIndex = POPULAR_TOURIST_CITY_INDEX.get(extractWeatherCityName(right)) ?? 999;
      return leftIndex - rightIndex;
    })
    .slice(0, WEATHER_MAX_CITY_CARDS);
}

function formatTouristWeatherSectionTitle(sourceTitleHtml) {
  const text = stripInlineText(sourceTitleHtml);
  const dateMatch = text.match(/(\d{1,2}月\d{1,2}日)/u);
  return dateMatch ? `🌤️ 热门旅游城市天气 · ${dateMatch[1]}` : '🌤️ 热门旅游城市天气';
}

function renderWeatherCityCard(cardHtml) {
  const city = extractWeatherCityName(cardHtml)
    || stripInlineText(extractInnerHtml(cardHtml, /<span class="w-city">([\s\S]*?)<\/span>/i));
  const { cond, temp } = extractWeatherCondAndTemp(cardHtml);
  if (!city) return '';
  const detail = [cond, temp && temp.length <= 12 ? temp : ''].filter(Boolean).join(' · ');
  return `<p style="margin:0;font-size:13px;color:${BRAND.navyMid};line-height:1.55"><strong style="color:${BRAND.navy}">${city}</strong>${detail ? `<br>${detail}` : ''}</p>`;
}

/**
 * 微信部分版本会降级 flex，两列统一用 inline-block。
 * 外层格子只吃 50% 宽度（border-box + padding 做列间距），背景和内边距放在内层，
 * 这样即使 box-sizing 被 strip 也不会因为 padding 撑破 50% 而掉到下一行。
 */
function renderTwoColumnGrid(cells, { background = '', padding = '' } = {}) {
  if (cells.length === 0) return '';
  const innerStyle = [
    background ? `background:${background}` : '',
    background ? 'border-radius:10px' : '',
    padding ? `padding:${padding}` : '',
  ].filter(Boolean).join(';');
  const inner = cells.map((cell, index) => {
    const gutter = index % 2 === 0 ? 'padding:0 4px 8px 0' : 'padding:0 0 8px 4px';
    const content = innerStyle ? `<section style="${innerStyle}">${cell}</section>` : cell;
    return `<section style="display:inline-block;width:50%;box-sizing:border-box;vertical-align:top;${gutter}">${content}</section>`;
  }).join('');
  return `<section style="font-size:0;margin:0 0 6px">${inner}</section>`;
}

function renderWeatherSection(sectionHtml, { sectionId = 'weather', maxDetailChars = 96 } = {}) {
  const sourceTitle = extractInnerHtml(sectionHtml, /<div class="section-title"[^>]*>([\s\S]*?)<\/div>/i);
  const title = formatTouristWeatherSectionTitle(sourceTitle);
  const parts = [renderSectionTitle(title, sectionId)];

  const todayBlock = extractDivBlock(sectionHtml, 'weather-today');
  if (todayBlock) {
    const cityRaw = extractInnerHtml(todayBlock, /<div class="wt-city">([\s\S]*?)<\/div>/i)
      || extractInnerHtml(todayBlock, /<div class="c">([\s\S]*?)<\/div>/i);
    const cityName = normalizeWeatherCityLabel(cityRaw);
    const cityLabel = stripInlineText(cityRaw).replace(/^📍\s*/u, '📍 ');
    const detail = truncatePlainText(
      stripInlineText(extractInnerHtml(todayBlock, /<div class="wt-detail">([\s\S]*?)<\/div>/i))
        || stripInlineText(extractInnerHtml(todayBlock, /<div class="d">([\s\S]*?)<\/div>/i)),
      maxDetailChars,
    );
    if (isPopularTouristCityName(cityName) && (cityLabel || detail)) {
      parts.push(
        `<section style="margin:0 0 11px;background:${BRAND.tintBlue};border-left:3px solid ${BRAND.navy};border-radius:10px;padding:12px 13px">`,
        cityLabel ? `<p style="margin:0;font-size:15px;font-weight:700;color:${BRAND.navy};line-height:1.5">${cityLabel}</p>` : '',
        detail ? `<p style="margin:6px 0 0;font-size:13px;color:${BRAND.navySoft};line-height:1.8">${detail}</p>` : '',
        '</section>',
      );
    }
  }

  const gridBlock = extractDivBlock(sectionHtml, 'weather-grid');
  const cityCells = gridBlock
    ? selectTouristWeatherCards(extractClassDivBlocks(gridBlock, 'weather-card'))
      .map(renderWeatherCityCard)
      .filter(Boolean)
    : [];
  if (cityCells.length > 0) {
    parts.push(renderTwoColumnGrid(cityCells, {
      background: BRAND.tintBlue,
      padding: '10px 11px',
    }));
  } else {
    const summary = stripInlineText(extractInnerHtml(todayBlock ?? '', /<div class="d">([\s\S]*?)<\/div>/i));
    if (summary) {
      parts.push(
        `<section style="margin:0 0 11px;background:${BRAND.tintBlue};border-left:3px solid ${BRAND.navy};border-radius:10px;padding:12px 13px">`,
        `<p style="margin:0;font-size:13px;color:${BRAND.navySoft};line-height:1.8">${truncatePlainText(summary, maxDetailChars)}</p>`,
        '</section>',
      );
    }
  }
  return parts.filter(Boolean).join('');
}

function renderHistorySection(sectionHtml, { maxItems = 3, maxBodyChars = 72 } = {}) {
  const title = extractInnerHtml(sectionHtml, /<div class="section-title"[^>]*>([\s\S]*?)<\/div>/i);
  const items = extractHistoryItemBlocks(sectionHtml)
    .slice(0, maxItems)
    .map((item) => {
      const year = stripInlineText(extractInnerHtml(item, /<span class="hy"[^>]*>([\s\S]*?)<\/span>/i));
      const event = truncatePlainText(
        stripInlineText(extractInnerHtml(item, /<span class="he"[^>]*>([\s\S]*?)<\/span>/i)),
        maxBodyChars,
      );
      if (!year || !event) return '';
      return [
        `<section style="margin:0 0 8px;background:${BRAND.tintRed};border-radius:10px;padding:11px 12px">`,
        `<p style="margin:0;font-size:14px;color:${BRAND.ink};line-height:1.65"><strong style="color:${BRAND.red}">${year}</strong> · ${event}</p>`,
        '</section>',
      ].join('');
    })
    .filter(Boolean);
  if (items.length === 0) return '';
  return [renderSectionTitle(title, 'history'), ...items].join('');
}

function renderKnowledgeSection(sectionHtml, { maxItems = 4, maxBodyChars = 130 } = {}) {
  const title = extractInnerHtml(sectionHtml, /<div class="section-title"[^>]*>([\s\S]*?)<\/div>/i);
  const items = extractClassDivBlocks(sectionHtml, 'knowledge-item')
    .slice(0, maxItems)
    .map((item) => {
      const icon = stripInlineText(extractInnerHtml(item, /<div class="k-icon"[^>]*>([\s\S]*?)<\/div>/i));
      const heading = stripInlineText(extractInnerHtml(item, /<h4[^>]*>([\s\S]*?)<\/h4>/i));
      const body = truncatePlainText(
        stripInlineText(extractInnerHtml(item, /<p[^>]*>([\s\S]*?)<\/p>/i)),
        maxBodyChars,
      );
      if (!heading) return '';
      return [
        `<section style="margin:0 0 10px;background:${BRAND.tintRed};border-radius:10px;padding:13px 14px">`,
        `<p style="margin:0;font-size:15px;font-weight:700;color:${BRAND.ink};line-height:1.55"><strong>${icon ? `${icon} ` : ''}${heading}</strong></p>`,
        body ? `<p style="margin:7px 0 0;font-size:13px;color:${BRAND.body};line-height:1.8">${body}</p>` : '',
        '</section>',
      ].filter(Boolean).join('');
    })
    .filter(Boolean);
  if (items.length === 0) return '';
  return [renderSectionTitle(title, 'knowledge'), ...items].join('');
}

function renderSectionFigure(figureHtml, imageUrlMap = new Map()) {
  const src = String(figureHtml).match(/<img[^>]+src=["']([^"']+)["']/i)?.[1] ?? '';
  const mapped = resolveMappedImageUrl(src, imageUrlMap);
  if (!mapped) return '';
  const alt = stripInlineText(String(figureHtml).match(/\balt=["']([^"']*)["']/i)?.[1] ?? '');
  const caption = stripInlineText(
    extractInnerHtml(figureHtml, /<figcaption[^>]*>([\s\S]*?)<\/figcaption>/i),
  );
  // margin 刻意避开 INLINE_CARD_SECTION_RE 识别的卡片区间。
  return [
    '<section style="margin:0 0 18px;text-align:center">',
    `<img src="${mapped}" alt="${alt}" style="width:100%;border-radius:10px;display:block" />`,
    caption ? `<p style="margin:8px 0 0;font-size:12px;color:${BRAND.muted};line-height:1.6">${caption}</p>` : '',
    '</section>',
  ].filter(Boolean).join('');
}

function renderQuickLinks(html) {
  const block = extractDivBlock(extractBodyInner(html), 'quick-links');
  if (!block) return '';
  const labels = [...block.matchAll(/<a[^>]*>([\s\S]*?)<\/a>/gi)]
    .map((item) => stripInlineText(item[1]))
    .filter(Boolean)
    .filter((label) => !/^(🔥|𝕏\s*)?热搜/u.test(label) && !/热门事件/u.test(label));
  if (labels.length === 0) return '';
  const pills = labels
    .map((label) => `<span style="display:inline-block;padding:5px 12px;margin:0 6px 7px 0;border:1px solid ${BRAND.hair};border-radius:20px;font-size:12px;color:${BRAND.body}">${label}</span>`)
    .join('');
  return `<section style="margin:14px 0 0;line-height:1.6">${pills}</section>`;
}

function splitSections(html) {
  const body = extractBodyInner(html);
  const sections = [];
  const openRe = /<div class="section"([^>]*)>/gi;
  let match = openRe.exec(body);
  while (match) {
    const start = match.index + match[0].length;
    const attrs = match[1] ?? '';
    const id = attrs.match(/\bid="([^"]+)"/i)?.[1] ?? '';
    const nextBoundary = body.slice(start).search(
      /<div class="section"|<div class="footer"|<div[^>]*data-mindspace-public-share/i,
    );
    const inner = nextBoundary === -1 ? body.slice(start) : body.slice(start, start + nextBoundary);
    const htmlChunk = `<div class="section"${attrs}>${inner}`;
    const title = stripInlineText(extractInnerHtml(htmlChunk, /<div class="section-title"[^>]*>([\s\S]*?)<\/div>/i));
    sections.push({ id, title, html: htmlChunk });
    openRe.lastIndex = nextBoundary === -1 ? body.length : start + nextBoundary;
    match = openRe.exec(body);
  }
  return sections;
}

function renderGenericSection(
  sectionHtml,
  {
    sectionId = '',
    maxCards = null,
    maxBodyChars = null,
    imageUrlMap = new Map(),
    news002Mode = false,
  } = {},
) {
  const title = extractInnerHtml(sectionHtml, /<div class="section-title"[^>]*>([\s\S]*?)<\/div>/i);
  if (/近7天新闻早报/u.test(stripInlineText(title))) return '';
  const body = String(sectionHtml).replace(
    /^[\s\S]*?<div class="section-title"[^>]*>[\s\S]*?<\/div>/i,
    '',
  );
  // news001 用 div.card / div.highlight-box；news002 还会用 a.lead-card 做头条卡。
  const tokens = body
    .split(/(?=<figure class="section-figure"|<div class="(?:card|highlight-box)|<a class="lead-card)/i)
    .filter(Boolean);
  const parts = [renderSectionTitle(title, sectionId)];
  let cardCount = 0;
  let listIndex = 0;
  for (const token of tokens) {
    if (/^<figure class="section-figure"/i.test(token)) {
      const rendered = renderSectionFigure(token, imageUrlMap);
      if (rendered) parts.push(rendered);
      continue;
    }
    const isLeadCard = /^<a class="lead-card/i.test(token);
    if (!isLeadCard && !/^<div class="(?:card|highlight-box)/i.test(token)) continue;
    if (maxCards != null && cardCount >= maxCards) continue;
    const cardChunk = token.replace(/^(?:<div class="(?:card|highlight-box)|<a class="lead-card)(?:\s|")/i, '');
    const cardHtml = `<div class="card ${isLeadCard ? 'lead-card ' : ''}${cardChunk}`;
    // 序号只给列表条目，头条卡与榜单卡靠自身样式区分，不占号。
    const rendered = renderCard(cardHtml, {
      maxBodyChars,
      index: listIndex,
      imageUrlMap,
      news002Mode,
    });
    if (rendered) {
      parts.push(rendered);
      cardCount += 1;
      if (classifyCard(cardHtml, { news002Mode }) === 'list') listIndex += 1;
    }
  }
  if (cardCount === 0) return '';
  return parts.join('');
}

const DEFAULT_SECTION_CARD_LIMITS = {
  headlines: 7,
  world: 5,
  domestic: 5,
  google: 3,
  x: 3,
  asia_pacific: 3,
  commodities: 3,
  ai_chips: 3,
  policy: 3,
  universities: 3,
  global_markets: 3,
  community: 3,
  science: 3,
  culture: 3,
  startup: 3,
  crypto: 2,
  geopolitics: 3,
  local_life: 3,
  official_feeds: 3,
  finance: 5,
  tech: 5,
  sports: 3,
  technews: 2,
  knowledge: 3,
};

const DEFAULT_CARD_BODY_CHARS = 132;
const MIN_CARDS_TO_KEEP = 16;

const BASE_TRIM_FLAGS = Object.freeze({
  skipHistory: false,
  skipKnowledge: false,
  skipWeather: false,
  skipQuickLinks: true,
  skipPageFooter: true,
});

function mergeSectionCardLimits(fullCounts = {}, caps = DEFAULT_SECTION_CARD_LIMITS) {
  const merged = { ...caps };
  for (const [id, count] of Object.entries(fullCounts)) {
    const cap = caps[id];
    merged[id] = cap == null ? count : Math.min(count, cap);
  }
  return merged;
}

/** 每档栏目容量，从「较全量」到「精简」。 */
const CARD_LIMIT_TIERS = [
  DEFAULT_SECTION_CARD_LIMITS,
  DEFAULT_SECTION_CARD_LIMITS,
  { ...DEFAULT_SECTION_CARD_LIMITS, headlines: 6, world: 4, domestic: 4, finance: 4, tech: 4, knowledge: 3 },
  { headlines: 5, world: 3, domestic: 3, google: 2, finance: 3, tech: 3, sports: 2, technews: 1, knowledge: 3 },
  { headlines: 4, world: 3, domestic: 3, google: 1, finance: 2, tech: 2, sports: 2, technews: 1, knowledge: 2 },
];

/** 每档卡片摘要字数，标题信息已足够时优先压缩摘要来换取更多条目。 */
const BODY_CHAR_TIERS = [DEFAULT_CARD_BODY_CHARS, 120, 108, 96];

const TRIM_PROFILES = CARD_LIMIT_TIERS.map((sectionCardLimits, index) => ({
  ...BASE_TRIM_FLAGS,
  sectionCardLimits,
  maxBodyChars: BODY_CHAR_TIERS[Math.min(index, BODY_CHAR_TIERS.length - 1)],
}));

/**
 * 缩容权重：数值越大越先被砍。要闻权重最低（最后才动），
 * 知识小卡片、体育、热搜等补充栏目先让位，保证各栏目都还有内容。
 */
const SECTION_SHRINK_WEIGHTS = {
  knowledge: 1.7,
  culture: 1.65,
  community: 1.62,
  crypto: 1.6,
  local_life: 1.58,
  startup: 1.55,
  science: 1.5,
  sports: 1.45,
  x: 1.38,
  google: 1.35,
  official_feeds: 1.33,
  asia_pacific: 1.3,
  commodities: 1.28,
  universities: 1.25,
  ai_chips: 1.2,
  geopolitics: 1.15,
  policy: 1.1,
  global_markets: 1.08,
  technews: 1.05,
  tech: 1,
  finance: 0.95,
  world: 0.9,
  domestic: 0.9,
  headlines: 0.65,
};

const MIN_SECTION_CARDS = { headlines: 3, knowledge: 2 };

function countSectionCards(sections) {
  const counts = {};
  for (const section of sections) {
    if (!section.id || section.id === 'weather' || section.id === 'history') continue;
    if (/历史上的今天|近7天新闻早报/u.test(section.title)) continue;
    const total = section.id === 'knowledge'
      ? extractClassDivBlocks(section.html, 'knowledge-item').length
      : (section.html.match(/<div class="(?:card|highlight-box)/gi) ?? []).length;
    if (total > 0) counts[section.id] = total;
  }
  return counts;
}

function pickShrinkTarget(limits) {
  let bestId = null;
  let bestScore = 0;
  for (const [id, count] of Object.entries(limits)) {
    const floor = MIN_SECTION_CARDS[id] ?? 1;
    if (count <= floor) continue;
    const score = count * (SECTION_SHRINK_WEIGHTS[id] ?? 1.1);
    if (score > bestScore) {
      bestId = id;
      bestScore = score;
    }
  }
  return bestId;
}

function resolveSectionCardLimit(section, sectionCardLimits) {
  if (!sectionCardLimits) return null;
  return sectionCardLimits[section.id] ?? 3;
}

function shouldSkipSection(section, trimProfile) {
  if (!section) return true;
  if (section.id === 'hot') return true;
  if (section.id === 'history') return trimProfile?.skipHistory === true;
  if (section.id === 'knowledge' && trimProfile?.skipKnowledge === true) return true;
  if (trimProfile?.skipSectionIds?.includes(section.id)) return true;
  if (/近7天新闻早报/u.test(section.title)) return true;
  if (/历史上的今天/u.test(section.title) && trimProfile?.skipHistory !== false) return true;
  return false;
}

function renderPageFooter(html) {
  const footer = String(html).match(/<div class="footer"[^>]*>([\s\S]*?)<\/div>/i)?.[1] ?? '';
  if (!footer) return '';
  const lines = [...footer.matchAll(/<p[^>]*>([\s\S]*?)<\/p>/gi)]
    .map((item) => stripInlineText(item[1]))
    .filter(Boolean)
    .slice(0, 2);
  if (lines.length === 0) return '';
  return [
    `<section style="margin:22px 0 0;padding:16px 0 0;border-top:1px solid ${BRAND.line};text-align:center">`,
    ...lines.map((line) => `<p style="margin:0 0 6px;font-size:12px;color:${BRAND.muted};line-height:1.7">${line}</p>`),
    '</section>',
  ].join('');
}

/** 与 wechat-draft-article-layout.mjs 的同名函数保持一致，改动需同步两处。 */
export function renderReadOriginalLink(publicUrl) {
  if (!publicUrl) return '';
  return [
    `<section style="text-align:center;margin:28px 0 14px;padding:24px 18px;background:${BRAND.tintBlue};border:1px dashed ${BRAND.navyMid};border-radius:16px">`,
    `<p style="margin:0;font-size:15px;font-weight:700;color:${BRAND.navy};line-height:1.6">完整网页版更精彩</p>`,
    `<p style="margin:8px 0 0;font-size:12px;color:${BRAND.navySoft};line-height:1.6">全部资讯 · 高清配图 · 来源直达 · 历史早报</p>`,
    `<p style="margin:15px 0 0;font-size:19px;line-height:1;color:${BRAND.navyMid};letter-spacing:8px">⬇ ⬇ ⬇</p>`,
    '<p style="margin:15px 0 0">',
    `<a href="${publicUrl}" style="display:inline-block;padding:13px 36px;border-radius:999px;background:linear-gradient(135deg,${BRAND.navy},${BRAND.navyMid});color:#fff;font-size:16px;font-weight:700;text-decoration:none">📖 阅读原文</a>`,
    '</p>',
    `<p style="margin:14px 0 0;font-size:12px;color:${BRAND.navySoft};line-height:1.5">点击上方按钮，查看完整早报</p>`,
    '</section>',
  ].join('');
}

export function renderCreatePortalCTA(portalUrl = DEFAULT_PORTAL_URL) {
  return `<p style="margin:18px 0 0;font-size:13px;color:${BRAND.muted};text-align:center;line-height:1.7">✨ 一起创作 → <a href="${portalUrl}" style="color:${BRAND.red};font-weight:600;text-decoration:underline">点我</a></p>`;
}

/** 与 wechat-draft-article-layout.mjs 的关注区保持一致，改动需同步两处。 */
function renderFollowMpSection(qrcodeImageUrl = '') {
  const qrcodeBlock = qrcodeImageUrl
    ? `<img src="${qrcodeImageUrl}" alt="TKMind 服务号二维码" style="width:${FOLLOW_QRCODE_SIZE_PX}px;height:${FOLLOW_QRCODE_SIZE_PX}px;display:block;margin:14px auto 0;border-radius:10px" />`
    : '';
  return [
    `<section style="text-align:center;padding:24px 16px;margin:18px 0 8px;background:${BRAND.tintRed};border-radius:14px">`,
    `<p style="margin:0;font-size:16px;font-weight:700;color:${BRAND.red};line-height:1.5">欢迎关注 TKMind 智趣</p>`,
    `<p style="margin:8px 0 0;font-size:12px;color:${BRAND.muted};line-height:1.6">每日早报 · 智能创作 · 一键成页</p>`,
    qrcodeBlock,
    qrcodeImageUrl
      ? `<p style="margin:12px 0 0;font-size:12px;color:${BRAND.muted}">长按扫描关注</p>`
      : `<p style="margin:12px 0 0;font-size:12px;color:${BRAND.muted}">关注 TKMind 服务号</p>`,
    '</section>',
  ].filter(Boolean).join('');
}

/**
 * 内容卡统一以 `margin:0 0 12px` 开头（见 WX.listWrap / WX.feature / WX.rankWrap），
 * 便于按整卡统计与裁剪。调整 margin 时必须同步这里。
 */
const INLINE_CARD_SECTION_RE = /<section style="margin:0 0 12px[^"]*">[\s\S]*?<strong>[\s\S]*?<\/section>/g;
const INLINE_SECTION_TITLE_PREFIX = '<p style="margin:20px 0 10px;padding-bottom:6px;border-bottom:1px solid';

function countInlineCards(body) {
  return (String(body ?? '').match(INLINE_CARD_SECTION_RE) ?? []).length;
}

/**
 * 超预算时按整张卡片从尾部删除，避免 clip 把最后一张卡截成半段。
 * 一个栏目只剩一张卡时连栏目标题一起删掉，不留孤立标题。
 */
export function trimWechatInlineBodyByRemovingCards(body, maxLen, {
  minCards = MIN_CARDS_TO_KEEP,
} = {}) {
  let result = String(body ?? '');
  if (!maxLen || result.length <= maxLen) return result;

  while (result.length > maxLen) {
    const matches = [...result.matchAll(INLINE_CARD_SECTION_RE)];
    if (matches.length <= minCards) break;

    const last = matches[matches.length - 1];
    let start = last.index ?? 0;
    const end = start + last[0].length;
    const before = result.slice(0, start);

    // 被删卡片紧跟在栏目标题后面时，该栏目已经空了，标题一起删掉。
    const titleStart = before.lastIndexOf(INLINE_SECTION_TITLE_PREFIX);
    if (titleStart >= 0) {
      const titleEnd = before.indexOf('</p>', titleStart);
      const between = titleEnd === -1 ? 'keep' : before.slice(titleEnd + 4).trim();
      const cardsBeforeTitle = [...before.slice(0, titleStart).matchAll(INLINE_CARD_SECTION_RE)];
      if (between === '' && cardsBeforeTitle.length > 0) {
        start = titleStart;
      }
    }
    result = `${result.slice(0, start)}${result.slice(end)}`.trimEnd();
  }

  return result;
}

function buildWechatInlineContent(html, {
  publicUrl = '',
  qrcodeImageUrl = '',
  portalUrl = DEFAULT_PORTAL_URL,
  trimProfile = TRIM_PROFILES[0],
  includeFixedLayout = true,
  imageUrlMap = new Map(),
} = {}) {
  const sections = splitSections(html);
  const news002Mode = isNews002Html(html);
  const digest = renderTodayDigest(html);
  const isNews002 = /class="[^"]*\bmasthead\b/i.test(String(html ?? ''));
  const bodyParts = [renderHero(html, imageUrlMap, { includeSubtitle: !digest })];
  if (digest) bodyParts.push(digest);

  const contentParts = [];
  let renderedSectionCount = 0;

  for (const section of sections) {
    if (shouldSkipSection(section, trimProfile)) continue;
    if (resolveSectionCardLimit(section, trimProfile.sectionCardLimits) === 0) continue;

    if (section.id === 'weather') {
      if (trimProfile.skipWeather) continue;
      const rendered = renderWeatherSection(section.html, { sectionId: section.id });
      if (rendered) {
        contentParts.push(rendered);
        renderedSectionCount += 1;
      }
      continue;
    }

    if (section.id === 'history') {
      const rendered = renderHistorySection(section.html);
      if (rendered) {
        contentParts.push(rendered);
        renderedSectionCount += 1;
      }
      continue;
    }

    if (section.id === 'knowledge') {
      const rendered = renderKnowledgeSection(section.html, {
        maxItems: resolveSectionCardLimit(section, trimProfile.sectionCardLimits) ?? 4,
        maxBodyChars: Math.min(trimProfile.maxBodyChars ?? 130, 130),
      });
      if (rendered) {
        contentParts.push(rendered);
        renderedSectionCount += 1;
      }
      continue;
    }

    const rendered = renderGenericSection(section.html, {
      sectionId: section.id,
      maxCards: resolveSectionCardLimit(section, trimProfile.sectionCardLimits),
      maxBodyChars: trimProfile.maxBodyChars,
      imageUrlMap,
      news002Mode,
    });
    if (rendered) {
      contentParts.push(rendered);
      renderedSectionCount += 1;
    }
  }

  if (!trimProfile.skipQuickLinks) {
    bodyParts.push(renderQuickLinks(html));
  }
  bodyParts.push(...contentParts);
  if (!trimProfile.skipPageFooter) {
    bodyParts.push(renderPageFooter(html));
  }

  const ordered = bodyParts.filter(Boolean);
  if (includeFixedLayout) {
    if (publicUrl) ordered.push(renderReadOriginalLink(publicUrl));
    ordered.push(renderFollowMpSection(qrcodeImageUrl));
    ordered.push(renderCreatePortalCTA(portalUrl));
  }

  return {
    content: ordered.join(''),
    sectionCount: sections.length,
    renderedSectionCount,
  };
}

/**
 * 从「全部栏目全部卡片」出发，按缩容权重逐条让位，直到正文压进预算。
 * 相比固定档位，这样能精确填满预算并保持各栏目都有内容。
 * 外层再扫几档摘要字数，取资讯条数最多（条数相同时摘要更长）的一版。
 */
function fitInlineContentToBudget(html, bodyBudget, {
  publicUrl = '',
  qrcodeImageUrl = '',
  portalUrl = DEFAULT_PORTAL_URL,
  imageUrlMap = new Map(),
} = {}) {
  const fullCounts = countSectionCards(splitSections(html));
  const cappedCounts = mergeSectionCardLimits(fullCounts, DEFAULT_SECTION_CARD_LIMITS);
  const render = (trimProfile) => buildWechatInlineContent(html, {
    publicUrl,
    qrcodeImageUrl,
    portalUrl,
    trimProfile,
    includeFixedLayout: false,
    imageUrlMap,
  });

  let best = null;
  for (const [tier, maxBodyChars] of BODY_CHAR_TIERS.entries()) {
    const tierCaps = CARD_LIMIT_TIERS[tier] ?? DEFAULT_SECTION_CARD_LIMITS;
    const sectionCardLimits = mergeSectionCardLimits(fullCounts, tierCaps ?? cappedCounts);
    let built = render({ ...BASE_TRIM_FLAGS, sectionCardLimits, maxBodyChars });
    let guard = 0;
    while (built.content.length > bodyBudget && guard < 80) {
      guard += 1;
      const target = pickShrinkTarget(sectionCardLimits);
      if (!target) break;
      sectionCardLimits[target] -= 1;
      built = render({ ...BASE_TRIM_FLAGS, sectionCardLimits, maxBodyChars });
    }
    if (built.content.length > bodyBudget) continue;
    const cards = countInlineCards(built.content);
    const length = built.content.length;
    if (!best || cards > best.cards || (cards === best.cards && length > best.length)) {
      best = { built, cards, length, bodyCharTier: tier, sectionCardLimits, usedFallback: false };
    }
  }

  if (best) return best;

  const fallbackProfile = {
    ...BASE_TRIM_FLAGS,
    skipKnowledge: true,
    sectionCardLimits: {
      headlines: 3,
      world: 2,
      domestic: 2,
      google: 1,
      x: 1,
      asia_pacific: 1,
      finance: 2,
      tech: 2,
      ai_chips: 1,
      global_markets: 1,
      sports: 1,
      technews: 1,
      knowledge: 0,
    },
    maxBodyChars: 80,
  };
  const built = render(fallbackProfile);
  return {
    built,
    cards: countInlineCards(built.content),
    length: built.content.length,
    bodyCharTier: BODY_CHAR_TIERS.length,
    sectionCardLimits: fallbackProfile.sectionCardLimits,
    usedFallback: true,
  };
}

function estimateQrcodeUrlForLayout(qrcodeImageUrl = '') {
  const url = String(qrcodeImageUrl ?? '');
  if (!url) return '';
  if (url.length >= 180) return url;
  return `${url}${'x'.repeat(180 - url.length)}`;
}

function estimateFixedLayoutLength({
  publicUrl = '',
  qrcodeImageUrl = '',
  portalUrl = DEFAULT_PORTAL_URL,
} = {}) {
  const qrcodeForEstimate = estimateQrcodeUrlForLayout(qrcodeImageUrl);
  return (
    (publicUrl ? renderReadOriginalLink(publicUrl).length : 0)
    + renderFollowMpSection(qrcodeForEstimate).length
    + renderCreatePortalCTA(portalUrl).length
  );
}

export function convertDailyNewsHtmlToWechatInlineArticle(html, {
  publicUrl = '',
  qrcodeImageUrl = '',
  portalUrl = DEFAULT_PORTAL_URL,
  imageUrlMap = new Map(),
  includeFixedLayout = true,
  fixedLayoutLength = null,
} = {}) {
  const title = (extractPageTitle(html) || '每日新闻早报').slice(0, 32);
  const digest = (extractMetaDescription(html) || title).slice(0, 120);

  const fixedLayoutLengthResolved = Number.isFinite(fixedLayoutLength)
    ? fixedLayoutLength
    : estimateFixedLayoutLength({ publicUrl, qrcodeImageUrl, portalUrl });
  const bodyBudget = Math.max(
    8000,
    MAX_WECHAT_CONTENT_CHARS - fixedLayoutLengthResolved - 120,
  );

  const fitted = fitInlineContentToBudget(html, bodyBudget, {
    publicUrl,
    qrcodeImageUrl,
    portalUrl,
    imageUrlMap,
  });
  const trimLevel = fitted.bodyCharTier;
  const built = fitted.built;
  let usedFallback = fitted.usedFallback;
  let content = built?.content ?? '';
  const maxBodyChars = includeFixedLayout
    ? Math.max(6000, MAX_WECHAT_CONTENT_CHARS - fixedLayoutLengthResolved)
    : bodyBudget;
  if (content.length > maxBodyChars) {
    content = trimWechatInlineBodyByRemovingCards(content, maxBodyChars, {
      minCards: MIN_CARDS_TO_KEEP,
    });
    usedFallback = true;
  }

  const bodyLength = content.length;
  if (includeFixedLayout) {
    const ordered = [content];
    if (publicUrl) ordered.push(renderReadOriginalLink(publicUrl));
    ordered.push(renderFollowMpSection(qrcodeImageUrl));
    ordered.push(renderCreatePortalCTA(portalUrl));
    content = ordered.join('');
  }

  if (includeFixedLayout && content.length > MAX_WECHAT_CONTENT_CHARS) {
    throw new Error(
      `微信正文超过 ${MAX_WECHAT_CONTENT_CHARS} 字符（当前 ${content.length}），请缩短 HTML 页面后重试`,
    );
  }

  return {
    title,
    digest,
    content,
    contentSourceUrl: publicUrl || undefined,
    contentMode: 'inline_html',
    contentLength: content.length,
    bodyLength,
    cardCount: countInlineCards(content),
    sectionCount: built?.sectionCount ?? 0,
    renderedSectionCount: built?.renderedSectionCount ?? 0,
    trimLevel,
    trimmed: trimLevel > 0 || usedFallback,
    usedFallbackTrim: usedFallback,
  };
}

export const wechatDailyNewsInlineInternals = {
  isNews002Html,
  renderCard,
  renderNews002CompactCard,
  renderHero,
  renderTodayDigest,
  renderBriefStats,
  renderWeatherSection,
  renderHistorySection,
  selectTouristWeatherCards,
  isPopularTouristCityName,
  renderKnowledgeSection,
  renderQuickLinks,
  renderGenericSection,
  renderSectionFigure,
  renderSectionTitle,
  renderCreatePortalCTA,
  buildWechatInlineContent,
  splitSections,
  trimWechatInlineBodyByRemovingCards,
  countInlineCards,
  TRIM_PROFILES,
  MAX_WECHAT_CONTENT_CHARS,
  MAX_WECHAT_CONTENT_TARGET_CHARS,
};