import { Common } from '../common';

export abstract class Storage {
  protected baseKey: string;

  constructor(baseKey?: string) {
    this.baseKey = baseKey;
  }

  /**
   * Determines if the current browser supports this storage type.
   * @returns true if the storage type is supported
   */
  public static supported() {
    return true;
  }

  public has(name: string): boolean {
    return !Common.includes([undefined, null], this.get(name));
  }

  /**
   * Returns a scoped key for storage.
   * @param key - The storage key.
   *
   * @example Storage.key('hello') // 'salte.auth.handler.redirect.hello'
   */
  protected key(key = ''): string {
    if (this.baseKey && key.indexOf(this.baseKey) === -1) {
      return `${this.baseKey}.${key}`;
    }

    return key;
  }
}

export interface Storage {
  get(name: string, defaultValue?: string): string | null;
  set(name: string, value: any): void;
  delete(name: string): void;
  clear(): void;
}