store.service.ts

import { Injectable } from '@angular/core';
import { Storage } from '@ionic/storage';

@Injectable({
  providedIn: 'root'
})
export class StoreService {

  private readonly _prefix: string;
  private readonly AUTH_TOKEN = 'authToken';
  private readonly TRACK_NUMBER = 'trackNumber';
  private readonly DEVICE_ID = 'deviceId';

  constructor(private _storage: Storage) {
    this._prefix = 'shuntassistant';
  }

  public setAuthToken(value: string): Promise<any> {
    return this.setValue(this.AUTH_TOKEN, value);
  }
    
  public getAuthToken(): Promise<string> {
    return this.readValue(this.AUTH_TOKEN);
  }

  public removeAuthToken(): Promise<any> {
    return this.removeValue(this.AUTH_TOKEN);
  }

  public setTrackNumber(value: string): Promise<any> {
    return this.setValue(this.TRACK_NUMBER, value);
  }
    
  public getTrackNumber(): Promise<string> {
    return this.readValue(this.TRACK_NUMBER);
  }

  public removeTrackNumber(): Promise<any> {
    return this.removeValue(this.TRACK_NUMBER);
  }

  public setDeviceId(value: string): Promise<any> {
    return this.setValue(this.DEVICE_ID, value);
  }

  public getDeviceId(): Promise<string> {
    return this.readValue(this.DEVICE_ID);
  }

  public removeDeviceId(): Promise<any> {
    return this.removeValue(this.DEVICE_ID);
  }

  private setValue(prop: any, value: any): Promise<any> {
    const key = `${this._prefix}-${prop}`;
    return this._storage.set(key, value);
  }

  private readValue(prop: keyof CoreState): Promise<any> {
    const key = `${this._prefix}-${prop}`;
    return this._storage.get(key);
  }

  private removeValue(prop: keyof CoreState): Promise<any> {
    const key = `${this._prefix}-${prop}`;
    return this._storage.remove(key);
  }
}