type CacheItem = {
  promise: Promise<any> | null;
};

class GlobalCacheManager {
  private static instance: GlobalCacheManager;
  private cacheMap: Map<string, CacheItem>;

  private constructor() {
    this.cacheMap = new Map();
  }

  static getInstance() {
    if (!GlobalCacheManager.instance) {
      GlobalCacheManager.instance = new GlobalCacheManager();
    }
    return GlobalCacheManager.instance;
  }

  get(cacheKey: string): CacheItem | undefined {
    return this.cacheMap.get(cacheKey);
  }

  set(cacheKey: string, item: CacheItem) {
    this.cacheMap.set(cacheKey, item);
  }

  delete(cacheKey: string) {
    this.cacheMap.delete(cacheKey);
  }
}

export const globalCache = GlobalCacheManager.getInstance();