(() => {
  let storage = require('Storage');

  var settings;
  var interval =  0; //used for the 1 second interval timer
  var diff;


  //Convert ms to time
  function getTime(t)  {
    var milliseconds = parseInt((t % 1000) / 100),
      seconds = Math.floor((t / 1000) % 60),
      minutes = Math.floor((t / (1000 * 60)) % 60),
      hours = Math.floor((t / (1000 * 60 * 60)) % 24);
    return hours.toString().padStart(2,0) + ":" + minutes.toString().padStart(2,0) + ":" + seconds.toString().padStart(2,0);
  }


  //counts down, calculates and displays
  function countDown() {
    var now = new Date();
    diff = settings.goal - now; //calculate difference
    // time is up
    if (settings.started && diff < 1000) {
      Bangle.buzz(1500);
      //write timer off to file
      settings.started = false;
      storage.writeJSON('widtmr.json', settings);
      clearInterval(interval); //stop interval
      interval = undefined;
    }
    // calculates width and redraws accordingly
    WIDGETS["widtmr"].redraw();
  }


  function updateSettings(){
    var now = new Date();
    const goal = new Date(now.getFullYear(), now.getMonth(), now.getDate(),
    now.getHours(), now.getMinutes() + settings.minutes, now.getSeconds());
    settings.goal = goal.getTime();

    settings.goal = goal.getTime();
    storage.writeJSON('widtmr.json', settings);
    WIDGETS["widtmr"].reload();
  }


  /*
   * Add the widgets and functions for other apps
   */
  WIDGETS["widtmr"]={area:"tl",width:0,draw:function() {
    if (!this.width) {
      return;
    }

    g.reset().setFontAlign(0,0).clearRect(this.x,this.y,this.x+this.width,this.y+23);

    var scale;
    var timeStr;
    if (diff < 3600000) { //less than 1 hour left
      width = 58;
      scale = 2;
      timeStr = getTime(diff).substring(3); // remove hour part 00:00:00 -> 00:00
    } else { //one hour or more left
      width = 48;
      scale = 1;
      timeStr = getTime(diff); //display hour 00:00:00 but small
    }

    // Font5x9Numeric7Seg - just build this in as it's tiny
    g.setFontCustom(atob("AAAAAAAAAAIAAAQCAQAAAd0BgMBdwAAAAAAAdwAB0RiMRcAAAERiMRdwAcAQCAQdwAcERiMRBwAd0RiMRBwAAEAgEAdwAd0RiMRdwAcERiMRdwAFAAd0QiEQdwAdwRCIRBwAd0BgMBAAABwRCIRdwAd0RiMRAAAd0QiEQAAAAAAAAAA="), 32, atob("BgAAAAAAAAAAAAAAAAYCAAYGBgYGBgYGBgYCAAAAAAAABgYGBgYG"), 9 + (scale<<8));
    g.drawString(timeStr, this.x+this.width/2, this.y+12);

  }, redraw:function() {
    var last = this.width;
    if (!settings.started) {
      this.width = 0;
    } else {
      this.width = (diff < 3600000) ? 58 : 48;
    }

    if (last != this.width) {
      Bangle.drawWidgets();
    } else {
      this.draw();
    }

  }, reload:function() {
    settings = storage.readJSON("widtmr.json",1)||{};
    if (interval) {
      clearInterval(interval);
    }
    interval = undefined;

    // start countdown each second
    if (settings.started) {
      interval = setInterval(countDown, 1000);
    }

    // reset everything
    countDown();

  }, isStarted: function(){
    settings = storage.readJSON("widtmr.json",1)||{started: false};
    return settings.started;

  }, setStarted: function(started){
    settings.started=started;
    updateSettings();

  }, increaseTimer: function(m){
    settings.minutes += m;
    updateSettings();

  }, decreaseTimer: function(m){
    settings.minutes -= m;
    if(settings.minutes <= 0){
      settings.started=false;
      settings.minutes=0;
    }
    updateSettings();

  }, setTime: function(t){
    settings.minutes = Math.max(0, t);
    settings.started = t > 0;
    updateSettings();

  }, getRemainingMinutes: function(){
    settings = storage.readJSON("widtmr.json",1)||{started: false};
    if(!settings.started){
      return -1;
    }

    var now = new Date();
    var diff = settings.goal - now;
    return  Math.round(diff / (1000*60));

  }, getRemainingTimeStr: function(){
    settings = storage.readJSON("widtmr.json",1)||{started: false};
    if(!settings.started){
      return;
    }

    var now = new Date();
    var diff = settings.goal - now;
    var timeStr = getTime(diff);
    if(diff < 3600000){
      timeStr = timeStr.substring(3); // remove hour part 00:00:00 -> 00:00
    }
    return timeStr;

  }, getRemainingTime: function(){
    settings = storage.readJSON("widtmr.json",1)||{started: false};
    if(!settings.started){
      return;
    }

    var now = new Date();
    var diff = settings.goal - now;
    return diff;
  }
};

  // set width correctly, start countdown each second
  WIDGETS["widtmr"].reload();
})();