import { LRUCache } from 'lru-cache';

/**
 * In-memory TTL cache backed by an LRU cache to prevent memory leaks.
 */
export class MemoryCache<T extends {}> {
	private lru: LRUCache<string, T>;

	constructor(ttlMs: number, max = 1000) {
		this.lru = new LRUCache<string, T>({
			max,
			ttl: ttlMs,
			ttlAutopurge: true
		});
	}

	get(key: string): T | undefined {
		return this.lru.get(key);
	}

	set(key: string, value: T): void {
		this.lru.set(key, value);
	}

	has(key: string): boolean {
		return this.lru.has(key);
	}

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

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