/**
 * OmniCard AI (CRMmp) - 深度洞见文章详情业务驱动层
 * 严格遵循 uts 强类型规范与 AGENTS.md 约束
 */

import { BentoBlockPublic, CardPortalDetail, RadarTrack } from '../../common/types.uts';
import { fetchPortalCard, recordRadarTrack } from '../../common/api.uts';
import { getCurrentLocale, getOmniText, OmniLocale } from '../../common/locale.uts';

export type ArticleDetailPageOptions = {
  cardId?: string;
  blockId?: string;
  id?: string;
};

export type ArticleOpenGraph = {
  title: string;
  description: string;
  image: string;
};

export type ArticleShareFields = {
  ctaLabel: string;
  copiedToast: string;
  shareUrl: string;
  title: string;
  description: string;
  image: string;
};

export type ArticleDetailState = {
  cardId: string;
  blockId: string;
  loading: boolean;
  article: BentoBlockPublic | null;
  title: string;
  content: string;
  mediaUrl: string;
  linkUrl: string;
  isHtmlContent: boolean;
  empty: boolean;
  errorMessage: string;
  openGraph: ArticleOpenGraph;
  authorName: string;
  authorTitle: string;
  authorCompany: string;
  authorAvatar: string;
  readTimeMinutes: number;
  summaryText: string;
  scrollDepth: number;
  enterTime: number;
  visitorId: string;
};

const BACK_LABEL = '返回';
const OG_DESC_MAX = 160;
const VISITOR_STORAGE_KEY = 'omni_visitor_id';

/**
 * 创建文章详情初始状态
 */
export function createArticleDetailState(): ArticleDetailState {
  return {
    cardId: '',
    blockId: '',
    loading: false,
    article: null,
    title: '',
    content: '',
    mediaUrl: '',
    linkUrl: '',
    isHtmlContent: false,
    empty: false,
    errorMessage: '',
    openGraph: {
      title: '',
      description: '',
      image: '',
    },
    authorName: '',
    authorTitle: '',
    authorCompany: '',
    authorAvatar: '',
    readTimeMinutes: 1,
    summaryText: '',
    scrollDepth: 0,
    enterTime: Date.now(),
    visitorId: '',
  };
}

/**
 * 将详情状态复位为空
 */
export function applyEmptyArticle(state: ArticleDetailState): void {
  state.article = null;
  state.title = '';
  state.content = '';
  state.mediaUrl = '';
  state.linkUrl = '';
  state.isHtmlContent = false;
  state.empty = true;
  state.openGraph = {
    title: '',
    description: '',
    image: '',
  };
  state.authorName = '';
  state.authorTitle = '';
  state.authorCompany = '';
  state.authorAvatar = '';
  state.readTimeMinutes = 1;
  state.summaryText = '';
  state.scrollDepth = 0;
}

/**
 * 从 onLoad options 写入 cardId / blockId
 */
export function applyArticleDetailOptions(
  state: ArticleDetailState,
  options: ArticleDetailPageOptions | null
): boolean {
  const cardIdRaw = options != null ? options.cardId || options.id || '' : '';
  const blockIdRaw = options != null ? options.blockId || '' : '';
  state.cardId = String(cardIdRaw).trim();
  state.blockId = String(blockIdRaw).trim();

  if (state.cardId === '' || state.blockId === '') {
    applyEmptyArticle(state);
    return false;
  }
  return true;
}

/**
 * 从 bentoBlocks 中选出指定 article 块
 */
export function pickArticleBlock(
  blocks: BentoBlockPublic[] | null | undefined,
  blockId: string
): BentoBlockPublic | null {
  if (blocks == null || !Array.isArray(blocks) || blocks.length === 0) {
    return null;
  }
  const targetId = blockId != null ? String(blockId).trim() : '';
  if (targetId === '') {
    return null;
  }
  for (let i = 0; i < blocks.length; i++) {
    const block = blocks[i];
    if (block != null && String(block.id) === targetId && block.type === 'article') {
      return block;
    }
  }
  return null;
}

/**
 * 正文是否像 HTML，供 rich-text / text 分流
 */
export function looksLikeHtml(content: string): boolean {
  if (content == null || content.trim() === '') {
    return false;
  }
  return /<\s*\/?\s*[a-zA-Z][^>]*>/.test(content);
}

/**
 * 去掉 HTML 标签，折叠空白
 */
export function stripHtmlToText(raw: string): string {
  if (raw == null || raw === '') {
    return '';
  }
  return raw.replace(/<[^>]+>/g, ' ').replace(/\s+/g, ' ').trim();
}

/**
 * 供后续 H5 meta 使用的 OpenGraph 三件套
 */
export function buildArticleOpenGraph(article: BentoBlockPublic | null): ArticleOpenGraph {
  if (article == null) {
    return {
      title: '',
      description: '',
      image: '',
    };
  }
  const desc = stripHtmlToText(article.content != null ? article.content : '');
  let description = desc;
  if (description.length > OG_DESC_MAX) {
    description = description.substring(0, OG_DESC_MAX - 3) + '...';
  }
  return {
    title: article.title != null ? article.title : '',
    description,
    image: article.mediaUrl != null ? article.mediaUrl : '',
  };
}

/**
 * 分享链接：优先块 linkUrl，否则当前页 URL
 */
export function resolveShareUrl(linkUrl: string, pageUrl: string): string {
  const fromBlock = linkUrl != null ? linkUrl.trim() : '';
  if (fromBlock !== '') {
    return fromBlock;
  }
  return pageUrl != null ? pageUrl.trim() : '';
}

/**
 * 构造当前页路径兜底
 */
export function buildArticlePagePath(cardId: string, blockId: string): string {
  return `/pages/portal/article-detail?cardId=${cardId}&blockId=${blockId}`;
}

type UniStackPage = {
  route?: string;
};

/**
 * 读取当前页 URL：优先页面栈，否则构造本地路径
 */
export function getCurrentPageUrl(state: ArticleDetailState): string {
  try {
    if (typeof getCurrentPages !== 'function') {
      return buildArticlePagePath(state.cardId, state.blockId);
    }
    const pages = getCurrentPages();
    if (pages != null && pages.length > 0) {
      const page = pages[pages.length - 1] as UniStackPage;
      const route = page != null && page.route != null ? String(page.route) : '';
      if (route !== '') {
        const path = route.startsWith('/') ? route : `/${route}`;
        return `${path}?cardId=${state.cardId}&blockId=${state.blockId}`;
      }
    }
  } catch (_e) {}

  return buildArticlePagePath(state.cardId, state.blockId);
}

/**
 * 分享文案与 OpenGraph 字段（CTA / Toast / URL / title / description / image）
 */
export function getArticleShareFields(
  state: ArticleDetailState,
  pageUrl: string
): ArticleShareFields {
  const og = state.openGraph;
  return {
    ctaLabel: resolveArticleDetailText('shareCta'),
    copiedToast: getOmniText(getCurrentLocale(), 'portal.copied_link'),
    shareUrl: resolveShareUrl(state.linkUrl, pageUrl),
    title: og.title,
    description: og.description,
    image: og.image,
  };
}

export function getArticleBackLabel(): string {
  return BACK_LABEL;
}

export function getArticleEmptyMessage(): string {
  return getOmniText(getCurrentLocale(), 'common.empty');
}

export type ArticleDetailTextKey =
  | 'kicker'
  | 'shareCta'
  | 'shareSuccess'
  | 'shareFailed'
  | 'copyFailed'
  | 'back'
  | 'empty'
  | 'emptyHint'
  | 'summary'
  | 'readTime'
  | 'minRead'
  | 'author'
  | 'viewPortal';

/**
 * 文章详情展示文案。严格遵循 AGENTS.md 多语言自然表达规范。
 */
export function resolveArticleDetailText(
  key: ArticleDetailTextKey,
  customLocale?: OmniLocale
): string {
  const locale = customLocale != null ? customLocale : getCurrentLocale();
  if (key === 'empty') {
    return getOmniText(locale, 'common.empty');
  }

  if (locale === 'zh-CN') {
    if (key === 'kicker') {
      return '深度洞见';
    }
    if (key === 'summary') {
      return '核心导读';
    }
    if (key === 'readTime') {
      return '预计阅读';
    }
    if (key === 'minRead') {
      return '分钟';
    }
    if (key === 'author') {
      return '专栏作者';
    }
    if (key === 'viewPortal') {
      return '查看微官网';
    }
    if (key === 'shareCta') {
      return '复制分享链接';
    }
    if (key === 'shareSuccess') {
      return '已分享';
    }
    if (key === 'shareFailed') {
      return '分享失败';
    }
    if (key === 'copyFailed') {
      return '复制失败';
    }
    if (key === 'back') {
      return '返回';
    }
    return '返回上一页继续浏览';
  }

  if (locale === 'ar-SA') {
    if (key === 'kicker') {
      return 'رؤى متعمقة';
    }
    if (key === 'summary') {
      return 'أبرز النقاط';
    }
    if (key === 'readTime') {
      return 'وقت القراءة';
    }
    if (key === 'minRead') {
      return 'دقائق';
    }
    if (key === 'author') {
      return 'كاتب المقال';
    }
    if (key === 'viewPortal') {
      return 'عرض الملف التعريفي';
    }
    if (key === 'shareCta') {
      return 'نسخ رابط المشاركة';
    }
    if (key === 'shareSuccess') {
      return 'تمت المشاركة';
    }
    if (key === 'shareFailed') {
      return 'فشلت المشاركة';
    }
    if (key === 'copyFailed') {
      return 'فشل النسخ';
    }
    if (key === 'back') {
      return 'رجوع';
    }
    return 'ارجع للصفحة السابقة للمتابعة';
  }

  if (locale === 'es-ES') {
    if (key === 'kicker') {
      return 'Perspectivas';
    }
    if (key === 'summary') {
      return 'Puntos clave';
    }
    if (key === 'readTime') {
      return 'Tiempo de lectura';
    }
    if (key === 'minRead') {
      return 'min';
    }
    if (key === 'author') {
      return 'Autor';
    }
    if (key === 'viewPortal') {
      return 'Ver perfil';
    }
    if (key === 'shareCta') {
      return 'Copiar enlace para compartir';
    }
    if (key === 'shareSuccess') {
      return 'Compartido';
    }
    if (key === 'shareFailed') {
      return 'Error al compartir';
    }
    if (key === 'copyFailed') {
      return 'Error al copiar';
    }
    if (key === 'back') {
      return 'Volver';
    }
    return 'Vuelve para seguir leyendo';
  }

  if (locale === 'de-DE') {
    if (key === 'kicker') {
      return 'Brancheneinblick';
    }
    if (key === 'summary') {
      return 'Kernaussagen';
    }
    if (key === 'readTime') {
      return 'Lesezeit';
    }
    if (key === 'minRead') {
      return 'Min.';
    }
    if (key === 'author') {
      return 'Autor';
    }
    if (key === 'viewPortal') {
      return 'Profil ansehen';
    }
    if (key === 'shareCta') {
      return 'Freigabelink kopieren';
    }
    if (key === 'shareSuccess') {
      return 'Geteilt';
    }
    if (key === 'shareFailed') {
      return 'Teilen fehlgeschlagen';
    }
    if (key === 'copyFailed') {
      return 'Kopieren fehlgeschlagen';
    }
    if (key === 'back') {
      return 'Zurück';
    }
    return 'Gehen Sie zurück, um weiterzulesen';
  }

  if (locale === 'fr-FR') {
    if (key === 'kicker') {
      return 'Éclairage d’expert';
    }
    if (key === 'summary') {
      return 'Points clés';
    }
    if (key === 'readTime') {
      return 'Temps de lecture';
    }
    if (key === 'minRead') {
      return 'min';
    }
    if (key === 'author') {
      return 'Auteur';
    }
    if (key === 'viewPortal') {
      return 'Voir le profil';
    }
    if (key === 'shareCta') {
      return 'Copier le lien de partage';
    }
    if (key === 'shareSuccess') {
      return 'Partagé';
    }
    if (key === 'shareFailed') {
      return 'Échec du partage';
    }
    if (key === 'copyFailed') {
      return 'Échec de la copie';
    }
    if (key === 'back') {
      return 'Retour';
    }
    return 'Revenez en arrière pour continuer';
  }

  if (locale === 'ja-JP') {
    if (key === 'kicker') {
      return 'インサイト';
    }
    if (key === 'summary') {
      return '要約';
    }
    if (key === 'readTime') {
      return '読了目安';
    }
    if (key === 'minRead') {
      return '分';
    }
    if (key === 'author') {
      return '執筆者';
    }
    if (key === 'viewPortal') {
      return 'プロフィールを見る';
    }
    if (key === 'shareCta') {
      return '共有リンクをコピー';
    }
    if (key === 'shareSuccess') {
      return '共有しました';
    }
    if (key === 'shareFailed') {
      return '共有に失敗しました';
    }
    if (key === 'copyFailed') {
      return 'コピーに失敗しました';
    }
    if (key === 'back') {
      return '戻る';
    }
    return '前のページに戻って続きを見る';
  }

  if (key === 'kicker') {
    return 'Thought Leadership';
  }
  if (key === 'summary') {
    return 'Key Takeaways';
  }
  if (key === 'readTime') {
    return 'Read time';
  }
  if (key === 'minRead') {
    return 'min';
  }
  if (key === 'author') {
    return 'Author';
  }
  if (key === 'viewPortal') {
    return 'View Profile';
  }
  if (key === 'shareCta') {
    return 'Copy share link';
  }
  if (key === 'shareSuccess') {
    return 'Shared';
  }
  if (key === 'shareFailed') {
    return 'Share failed';
  }
  if (key === 'copyFailed') {
    return 'Copy failed';
  }
  if (key === 'back') {
    return 'Back';
  }
  return 'Go back to keep reading';
}

function applyArticle(
  state: ArticleDetailState,
  article: BentoBlockPublic,
  card?: CardPortalDetail | null
): void {
  state.article = article;
  state.title = article.title != null ? article.title : '';
  state.content = article.content != null ? article.content : '';
  state.mediaUrl = article.mediaUrl != null ? article.mediaUrl : '';
  state.linkUrl = article.linkUrl != null ? article.linkUrl : '';
  state.isHtmlContent = looksLikeHtml(state.content);
  state.empty = false;
  state.openGraph = buildArticleOpenGraph(article);

  const cleanText = stripHtmlToText(state.content);
  state.readTimeMinutes = Math.max(1, Math.ceil(cleanText.length / 350));
  state.summaryText = state.openGraph.description;

  if (card != null) {
    state.authorName = card.name != null ? String(card.name) : '';
    state.authorTitle = card.title != null ? String(card.title) : '';
    state.authorCompany = card.company != null ? String(card.company) : '';
    state.authorAvatar = card.avatarUrl != null ? String(card.avatarUrl) : '';
  }
}

/**
 * fetchPortalCard 后从 bentoBlocks 选出 article 并绑定作者与元信息
 */
export async function loadArticleDetail(
  state: ArticleDetailState
): Promise<BentoBlockPublic | null> {
  if (state.cardId === '' || state.blockId === '') {
    applyEmptyArticle(state);
    return null;
  }

  state.loading = true;
  state.errorMessage = '';
  state.enterTime = Date.now();

  try {
    const card = await fetchPortalCard(state.cardId);
    const blocks = card != null && card.bentoBlocks != null ? card.bentoBlocks : [];
    const article = pickArticleBlock(blocks, state.blockId);
    state.loading = false;

    if (article == null) {
      applyEmptyArticle(state);
      return null;
    }

    applyArticle(state, article, card);
    return article;
  } catch (err) {
    state.loading = false;
    applyEmptyArticle(state);
    if (err instanceof Error) {
      state.errorMessage = err.message;
    } else {
      state.errorMessage = getOmniText(getCurrentLocale(), 'portal.unavailable');
    }
    return null;
  }
}

/**
 * 获取或初始化访客唯一识别码 (持久化在本地 Storage)
 */
export function getOrCreateVisitorId(): string {
  let visitorId = '';
  try {
    visitorId = uni.getStorageSync(VISITOR_STORAGE_KEY) as string;
  } catch (_e) {
    visitorId = '';
  }

  if (!visitorId || visitorId.trim() === '') {
    const randomPart = Math.random().toString(36).substring(2, 10);
    visitorId = `vis_${Date.now()}_${randomPart}`;
    try {
      uni.setStorageSync(VISITOR_STORAGE_KEY, visitorId);
    } catch (_e) {}
  }
  return visitorId;
}

/**
 * 记录并更新滑屏深度 (0 - 100%)
 */
export function updateArticleScrollDepth(
  state: ArticleDetailState,
  scrollTop: number,
  scrollHeight: number,
  windowHeight: number
): number {
  if (scrollHeight <= 0) {
    return state.scrollDepth;
  }
  const maxScroll = Math.max(1, scrollHeight - windowHeight);
  const currentRatio = Math.min(1, Math.max(0, scrollTop / maxScroll));
  const depth = Math.round(currentRatio * 100);
  if (depth > state.scrollDepth) {
    state.scrollDepth = depth;
  }
  return state.scrollDepth;
}

/**
 * 上报文章阅读停留时长与滑屏深度至访客雷达 CRM
 */
export async function reportArticleStay(
  state: ArticleDetailState,
  scrollDepth?: number
): Promise<RadarTrack | null> {
  if (state.cardId === '' || state.blockId === '') {
    return null;
  }
  const currentDepth = scrollDepth != null ? scrollDepth : state.scrollDepth;
  const enter = state.enterTime > 0 ? state.enterTime : Date.now();
  const stayDurationMs = Math.max(0, Date.now() - enter);
  const visitorId = state.visitorId !== '' ? state.visitorId : getOrCreateVisitorId();

  try {
    const track = await recordRadarTrack({
      cardId: state.cardId,
      visitorId,
      touchType: 'link',
      stayDurationMs,
      scrollDepth: currentDepth,
      viewedBlocks: [state.blockId],
    });
    return track;
  } catch (_e) {
    return null;
  }
}

/**
 * 导航至专栏作者的名片主微官网
 */
export function navToAuthorPortal(state: ArticleDetailState): void {
  if (state.cardId === '') {
    return;
  }
  uni.navigateTo({
    url: `/pages/portal/index?id=${state.cardId}`,
    fail: () => {
      uni.reLaunch({
        url: `/pages/portal/index?id=${state.cardId}`,
      });
    },
  });
}

type ShareWithSystemOption = {
  type?: string;
  summary?: string;
  href?: string;
  success?: () => void;
  fail?: (err: { errCode?: number; errMsg?: string } | null) => void;
};

type UniWithSystemShare = {
  shareWithSystem?: (options: ShareWithSystemOption) => void;
};

/**
 * 是否具备系统分享 API（uni.shareWithSystem）
 */
export function hasArticleSystemShare(): boolean {
  const uniShare = uni as UniWithSystemShare;
  return uniShare.shareWithSystem != null;
}

/**
 * 系统分享：仅 uni.shareWithSystem 明确 success 才提示「已分享」；
 * 失败 / 用户取消不得提示已分享。
 */
export function shareArticleViaSystem(
  state: ArticleDetailState,
  pageUrl?: string
): Promise<boolean> {
  const fallback = pageUrl != null ? pageUrl : getCurrentPageUrl(state);
  const shareUrl = resolveShareUrl(state.linkUrl, fallback);
  if (shareUrl === '') {
    return Promise.resolve(false);
  }

  const uniShare = uni as UniWithSystemShare;
  if (uniShare.shareWithSystem == null) {
    return Promise.resolve(false);
  }

  const summary = state.title !== '' ? state.title : shareUrl;

  return new Promise<boolean>(resolve => {
    uniShare.shareWithSystem!({
      type: 'text',
      summary: summary,
      href: shareUrl,
      success: () => {
        uni.showToast({
          title: resolveArticleDetailText('shareSuccess'),
          icon: 'none',
        });
        resolve(true);
      },
      fail: (err: { errCode?: number; errMsg?: string } | null) => {
        // 取消（1310600）静默；其它失败只提示 shareFailed
        const code = err != null && err.errCode != null ? err.errCode : 0;
        if (code !== 1310600) {
          uni.showToast({
            title: resolveArticleDetailText('shareFailed'),
            icon: 'none',
          });
        }
        resolve(false);
      },
    });
  });
}

/**
 * 主 CTA：复制 linkUrl 或当前页 URL。
 * 仅剪贴板 success 才提示直链已复制（P22）；失败只提示 copyFailed。
 */
export function copyArticleShareLink(state: ArticleDetailState, pageUrl?: string): boolean {
  const fallback = pageUrl != null ? pageUrl : getCurrentPageUrl(state);
  const shareUrl = resolveShareUrl(state.linkUrl, fallback);
  if (shareUrl === '') {
    return false;
  }

  uni.setClipboardData({
    data: shareUrl,
    success: () => {
      uni.showToast({
        title: getOmniText(getCurrentLocale(), 'portal.copied_link'),
        icon: 'none',
      });
    },
    fail: () => {
      uni.showToast({
        title: resolveArticleDetailText('copyFailed'),
        icon: 'none',
      });
    },
  });
  return true;
}

/**
 * 底栏主动作：有系统分享则走系统分享；否则回退复制链接。
 * 分享失败/取消不回退复制，避免把失败伪装成已分享或已复制。
 */
export async function performArticleShareAction(
  state: ArticleDetailState,
  pageUrl?: string
): Promise<boolean> {
  if (hasArticleSystemShare()) {
    return await shareArticleViaSystem(state, pageUrl);
  }
  return copyArticleShareLink(state, pageUrl);
}

/**
 * 空状态返回：优先回退上一页
 */
export function goBackFromArticle(state: ArticleDetailState): void {
  uni.navigateBack({
    delta: 1,
    fail: () => {
      const query = state.cardId !== '' ? `?id=${state.cardId}` : '';
      uni.reLaunch({
        url: `/pages/portal/index${query}`,
      });
    },
  });
}