// Simple in-memory cache with TTL
interface CacheEntry<T> {
  data: T;
  timestamp: number;
  ttl: number;
}

class SimpleCache {
  private cache: Map<string, CacheEntry<any>> = new Map();

  set<T>(key: string, data: T, ttlMinutes: number = 5): void {
    this.cache.set(key, {
      data,
      timestamp: Date.now(),
      ttl: ttlMinutes * 60 * 1000, // Convert to milliseconds
    });
  }

  get<T>(key: string): T | null {
    const entry = this.cache.get(key);
    
    if (!entry) {
      return null;
    }

    // Check if expired
    if (Date.now() - entry.timestamp > entry.ttl) {
      this.cache.delete(key);
      return null;
    }

    return entry.data as T;
  }

  delete(key: string): void {
    this.cache.delete(key);
  }

  clear(): void {
    this.cache.clear();
  }

  // Clean up expired entries
  cleanup(): void {
    const now = Date.now();
    for (const [key, entry] of this.cache.entries()) {
      if (now - entry.timestamp > entry.ttl) {
        this.cache.delete(key);
      }
    }
  }
}

// Global cache instance
export const apiCache = new SimpleCache();

// Run cleanup every 5 minutes (server-side only)
if (typeof window === 'undefined') {
  setInterval(() => {
    apiCache.cleanup();
  }, 5 * 60 * 1000);
}