import { Injectable, Self, Inject, InjectionToken } from '@angular/core';

export function _localStorage() {
  return localStorage;
}

export const BROWSER_LOCALSTORAGE = new InjectionToken<Storage>('Browser LocalStorage', {
  providedIn: 'root',
  factory: _localStorage
});

/**
 * localStorage生命周期是永久
 * 只能存储字符串类型的对象
 *
 * @export
 */
@Injectable()
export class NaLocalStorageService {

  constructor(@Inject(BROWSER_LOCALSTORAGE) public storage: any) { }

  public set(key: string, value: string): void {
    this.storage.setItem(key, value);
  }

  public get(key: string): string {
    return this.storage.getItem(key);
  }

  public setObject(key: string, value: any): void {
    // 将value转变为字符串存储
    this.storage.setItem(key, ((value == null) ? null : JSON.stringify(value)));
  }

  public getObject(key: string): any {
    return JSON.parse(this.storage.getItem(key));
  }

  public remove(key: string): any {
    this.storage.removeItem(key);
  }

}