Countdown timer

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  countdown: Ember.inject.service(),
  
  actions: {
    startTimer: function() {
      this.get('countdown').start();
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}, time left: {{countdown.timeLeft}}</h1>
<h1>Current time: {{countdown.currentTime}}</h1>
<h1>Last time: {{countdown.previousTime}}</h1>
<h1>Times: {{countdown.times}}</h1>
<br>
<button disabled={{countdown.running}} {{action 'startTimer'}}>Respawn</button>
<br>
{{outlet}}
<br>
<br>

countdown.service.js

import Ember from 'ember';

export default Ember.Service.extend({
  times: [1],
  
  currentTime: Ember.computed.alias('times.lastObject'),
  
  previousTime: Ember.computed('times.length', function() {
    var length = this.get('times.length');
    return this.get('times').objectAt(length - 2) || 1;
  }),
  
  timeLeft: null,
  
  running: Ember.computed.gt('timeLeft', 0),
  
  run: function(){
    var countdown = this;
    
    if(this.get('running')) {
      Ember.Logger.debug('Setting timer run');
      Ember.run.later(countdown, function() {
        this.decrementProperty('timeLeft');
        this.run();
      }, 1000);
    }
  },
  
  start() {
    var newTime = this.get('currentTime') + this.get('previousTime');
    this.set('timeLeft', this.get('currentTime'));
    this.get('times').pushObject(newTime);
    this.run();
  }
});

twiddle.json

{
  "version": "0.5.3",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.3.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}