import type { CacheService } from "./cache-service";

export class MemoryCacheService implements CacheService {
  private cache = new Map<string, { value: unknown; expiry: number | null }>();

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

    if (item.expiry && item.expiry < Date.now()) {
      this.cache.delete(key);
      return null;
    }

    return item.value as T;
  }

  async set<T>(key: string, value: T, ttlSeconds?: number): Promise<void> {
    const expiry = ttlSeconds ? Date.now() + ttlSeconds * 1000 : null;
    this.cache.set(key, { value, expiry });
  }

  async delete(key: string): Promise<void> {
    this.cache.delete(key);
  }
}