import * as NodeCache from 'node-cache';
import { IAuthentication } from './types/Authentication';

/**
 * this is just a simple abstraction to provide
 * an application layer for caching credentials
 */
export class Authentication implements IAuthentication {
	cache = new NodeCache();

	constructor(private authenticator: IAuthentication) {}

	async authenticate(username: string, password: string): Promise<boolean> {
		const cacheKey = `usr:${username}|pwd:${password}`;
		const fromCache = this.cache.get(cacheKey) as undefined | boolean;
		if (fromCache !== undefined) {
			return fromCache;
		}

		const authResult = await this.authenticator.authenticate(username, password);
		this.cache.set(cacheKey, authResult, 86400); // cache for one day

		return authResult;
	}
}