import { Injectable } from '@angular/core';
import { BackgroundMode } from '@ionic-native/background-mode';
import { Platform } from 'ionic-angular';
import { PowerManagement } from '@ionic-native/power-management';

@Injectable()
export class BackgroundProvider {


  private onPauseSubscription = undefined;
  constructor(private backgroundMode: BackgroundMode,
              private platform: Platform,
              private powerManagement: PowerManagement) { }

  public paused() {
    // push us to the background in this case so that we're not driving the screen...
    this.backgroundMode.moveToBackground();
  }

  public enableBackground(forceBackgroundOnPause) {
    // https://forum.ionicframework.com/t/i-found-a-solution-for-some-regular-background-activity/27012

    this.backgroundMode.setDefaults({
      title: "Radios App",
      hidden: false,
      silent: true,
      resume: false,
    });
    if (this.platform.is('android')) {
      this.backgroundMode.enable();
      this.backgroundMode.on('enable').subscribe(() => {
        this.backgroundMode.disableWebViewOptimizations();
      })
      if (forceBackgroundOnPause) {
        this.onPauseSubscription = this.platform.pause.subscribe(() => {
          console.log('paused')
          this.paused(); // when we pause, some apps are better left in the background so as to not keep the screen lit..
        });
      } else {
        this.onPauseSubscription = undefined;
      }

      this.powerManagement.dim()
        .then(() => {
          console.log('enablebackground: Wakelock acquired');
          this.powerManagement.setReleaseOnPause(false)
            .then(() => console.log('enablebackground: setReleaseOnPause success'))
            .catch(() => console.log('enablebackground: setReleaseOnPause Failed to set'));
        })
        .catch(() => console.log('enablebackground: Failed to acquire wakelock'));
    } else {
      this.backgroundMode.enable();
    }
  }

  public disableBackground() {
    console.log("Disabling Background Mode");
    if (this.platform.is('android')) {
      if (this.onPauseSubscription != undefined) {
        this.onPauseSubscription.unsubscribe();
      }
      this.backgroundMode.disable();
      this.powerManagement.release()
        .then(() => console.log('disableBackground: Wakelock released'))
        .catch(() => console.log('disableBackground: Failed to release wakelock'));
    } else {
      this.backgroundMode.disable();
    }
  }
}