/**
 * OmniCard AI (CRMmp) - 移动微官网离线 LocalStorage 极速预加载 Composable
 * 严格遵循 UTS 强类型规范与 AGENTS.md 准则
 */

import { CardPortalDetail } from '../../common/types.uts';

export interface CachedPortalData {
  version: string;
  timestamp: number;
  ttlMs: number;
  slug: string;
  data: CardPortalDetail;
}

export const PORTAL_CACHE_PREFIX = 'omni_portal_cache_';
export const DEFAULT_PORTAL_CACHE_TTL_MS: number = 86400000;
export const PORTAL_CACHE_VERSION = '1.0.0';

export function getPortalCacheKey(slug: string): string {
  return `${PORTAL_CACHE_PREFIX}${slug}`;
}

/**
 * 校验缓存时效与完整性（默认24小时）
 */
export function isCacheValid(cache: CachedPortalData | null): boolean {
  if (cache == null) {
    return false;
  }
  if (cache.version !== PORTAL_CACHE_VERSION) {
    return false;
  }
  if (cache.data == null || cache.data.id == null) {
    return false;
  }
  const now = Date.now();
  const age = now - cache.timestamp;
  if (age < 0 || age > cache.ttlMs) {
    return false;
  }
  return true;
}

/**
 * 秒级从本地 Storage 读取名片快照
 */
export function getCachedPortal(slug: string): CachedPortalData | null {
  if (slug == null || slug.trim() === '') {
    return null;
  }
  const key = getPortalCacheKey(slug.trim());
  try {
    const raw = uni.getStorageSync(key) as string;
    if (raw == null || raw.trim() === '') {
      return null;
    }
    const parsed = JSON.parse(raw) as CachedPortalData;
    if (parsed == null || typeof parsed !== 'object') {
      return null;
    }
    if (
      parsed.version == null ||
      parsed.timestamp == null ||
      parsed.ttlMs == null ||
      parsed.data == null ||
      parsed.data.id == null
    ) {
      return null;
    }
    return parsed;
  } catch (_e) {
    return null;
  }
}

/**
 * 写入缓存快照带时间戳、版本与 TTL
 */
export function setCachedPortal(
  slug: string,
  data: CardPortalDetail,
  ttlMs?: number
): boolean {
  if (slug == null || slug.trim() === '' || data == null || data.id == null) {
    return false;
  }
  const effectiveTtlMs =
    ttlMs != null && ttlMs > 0 ? ttlMs : DEFAULT_PORTAL_CACHE_TTL_MS;
  const cacheObj: CachedPortalData = {
    version: PORTAL_CACHE_VERSION,
    timestamp: Date.now(),
    ttlMs: effectiveTtlMs,
    slug: slug.trim(),
    data: data,
  };

  try {
    const key = getPortalCacheKey(slug.trim());
    uni.setStorageSync(key, JSON.stringify(cacheObj));
    return true;
  } catch (_e) {
    return false;
  }
}

/**
 * 清除指定名片本地缓存
 */
export function clearCachedPortal(slug: string): void {
  if (slug == null || slug.trim() === '') {
    return;
  }
  try {
    uni.removeStorageSync(getPortalCacheKey(slug.trim()));
  } catch (_e) {}
}