src/utils/LRUCache.ts

/**
 * LRU Cache otimizado para evitar memory leaks
 */

export class LRUCache<K, V> {
  private maxSize: number;
  private cache = new Map<K, V>();

  constructor(maxSize: number = 10) {
    this.maxSize = maxSize;
  }

  get(key: K): V | undefined {
    const value = this.cache.get(key);
    if (value !== undefined) {
      // Move para o final (mais recente)
      this.cache.delete(key);
      this.cache.set(key, value);
    }
    return value;
  }

  set(key: K, value: V): void {
    if (this.cache.has(key)) {
      // Atualizar valor existente
      this.cache.delete(key);
      this.cache.set(key, value);
      return;
    }

    if (this.cache.size >= this.maxSize) {
      // Remover o mais antigo (primeiro)
      const firstKey = this.cache.keys().next().value;
      this.cache.delete(firstKey);
    }

    this.cache.set(key, value);
  }

  has(key: K): boolean {
    return this.cache.has(key);
  }

  delete(key: K): boolean {
    return this.cache.delete(key);
  }

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

  size(): number {
    return this.cache.size;
  }

  keys(): IterableIterator<K> {
    return this.cache.keys();
  }

  values(): IterableIterator<V> {
    return this.cache.values();
  }

  // Método para cleanup automático baseado em tempo
  cleanup(maxAge: number = 5 * 60 * 1000): void {
    const now = Date.now();
    const toDelete: K[] = [];

    this.cache.forEach((value, key) => {
      if (typeof value === 'object' && value !== null && 'timestamp' in value) {
        const timestamp = (value as any).timestamp;
        if (now - timestamp > maxAge) {
          toDelete.push(key);
        }
      }
    });

    toDelete.forEach(key => this.cache.delete(key));
  }

  // Estatísticas de uso
  getStats() {
    return {
      size: this.cache.size,
      maxSize: this.maxSize,
      usage: (this.cache.size / this.maxSize) * 100
    };
  }
}