import * as _ from "lodash";
import { AppConfigType } from '../../entities/AppConfig';
import { StorageService } from './StorageService';
import { Parser } from './Parsers';
import { Marshaller } from './Marshallers';

export class CachedStorageService implements StorageService {
  constructor(private appConfig: AppConfigType, private localStorage: StorageService) {
  }

  contains(key: string): boolean {
    return !!this[`_${key}`] || this.localStorage.contains(key);
  }

  get<T extends string>(key: string): T;
  get<T>(key: string, parse?: Parser<T>): T {
    // Use cached value if there is one
    if (_.isNil(this[`_${key}`]))
      this[`_${key}`] = this.localStorage.get<T>(key, parse);
    return this[`_${key}`];
  }

  set<T extends string>(key: string, value: T): void;
  set<T>(key: string, value: T, marshal?: Marshaller<T>): void {
    this[`_${key}`] = value;
    // Don't put into local storage, if in CSA mode
    if (!this.appConfig.csa) this.localStorage.set<T>(key, value, marshal);
  }
}