/**
 * OmniCard AI (CRMmp) - 移动端 App / H5 智能数字名片 Universal Link 深度链接路由分发解析器
 * 严格遵循 AGENTS.md 与 uts 强类型跨端开发规范
 */

export interface DeepLinkRouteInfo {
  isValid: boolean;
  cardId?: number;
  cardSlug?: string;
  sceneMode: 'business' | 'social' | 'exhibition';
  locale: string;
  focusTab?: string;
  source: string;
  rawUrl?: string;
}

/**
 * 解析 URL 参数为 Key-Value 映射
 */
function parseQueryParams(queryString: string): Record<string, string> {
  const params: Record<string, string> = {};
  if (!queryString) return params;

  const pairs = queryString.replace(/^\?/, '').split('&');
  for (const pair of pairs) {
    if (!pair) continue;
    const [key, value] = pair.split('=');
    if (key) {
      params[decodeURIComponent(key)] = value ? decodeURIComponent(value) : '';
    }
  }
  return params;
}

/**
 * 解析 Universal Link 或 App Custom Scheme
 */
export function parseDeepLink(url?: string): DeepLinkRouteInfo {
  const fallback: DeepLinkRouteInfo = {
    isValid: false,
    sceneMode: 'business',
    locale: 'en',
    source: 'direct',
  };

  if (!url || typeof url !== 'string' || !url.trim()) {
    return fallback;
  }

  const clean = url.trim();

  // 1. 检查是否为 Universal Link (如 https://omnicard.ai/p/xxx 或 /c/xxx)
  if (clean.startsWith('http://') || clean.startsWith('https://')) {
    const isDomainMatch = clean.includes('omnicard.ai') || clean.includes('omni.me') || clean.includes('/p/');
    if (!isDomainMatch) {
      return fallback;
    }

    const questionIdx = clean.indexOf('?');
    const pathPart = questionIdx !== -1 ? clean.slice(0, questionIdx) : clean;
    const queryPart = questionIdx !== -1 ? clean.slice(questionIdx + 1) : '';

    const query = parseQueryParams(queryPart);

    // 提取 slug (例如 /p/alex-zheng -> alex-zheng)
    const pMatch = pathPart.match(/\/p\/([^/?#]+)/);
    const slug = pMatch ? pMatch[1] : undefined;

    return {
      isValid: true,
      cardSlug: slug,
      cardId: query.id ? Number(query.id) : undefined,
      sceneMode: (query.scene === 'social' || query.scene === 'exhibition') ? query.scene : 'exhibition',
      locale: query.lang || 'en',
      focusTab: query.tab,
      source: query.from || 'direct',
      rawUrl: clean,
    };
  }

  // 2. 检查是否为 App Scheme (omnicard://card/view?id=...)
  if (clean.startsWith('omnicard://')) {
    const questionIdx = clean.indexOf('?');
    const queryPart = questionIdx !== -1 ? clean.slice(questionIdx + 1) : '';
    const query = parseQueryParams(queryPart);

    return {
      isValid: true,
      cardId: query.id ? Number(query.id) : undefined,
      cardSlug: query.slug,
      sceneMode: (query.scene === 'social' || query.scene === 'exhibition') ? query.scene : 'business',
      locale: query.lang || 'en',
      focusTab: query.tab,
      source: query.from || 'direct',
      rawUrl: clean,
    };
  }

  return fallback;
}

/**
 * 将深度链接解析结果构建为应用内路由路径
 */
export function buildAppPageRoute(info: DeepLinkRouteInfo): string {
  if (!info || !info.isValid) {
    return '/pages/owner/hall/index';
  }

  const queryParts: string[] = [];
  if (info.cardSlug) queryParts.push(`slug=${encodeURIComponent(info.cardSlug)}`);
  if (info.cardId) queryParts.push(`id=${info.cardId}`);
  if (info.sceneMode) queryParts.push(`scene=${info.sceneMode}`);
  if (info.locale) queryParts.push(`lang=${info.locale}`);
  if (info.focusTab) queryParts.push(`tab=${info.focusTab}`);
  if (info.source) queryParts.push(`source=${info.source}`);

  const queryString = queryParts.length > 0 ? `?${queryParts.join('&')}` : '';
  return `/pages/portal/index${queryString}`;
}