'use strict';

!function($) {

function Timer(elem, options, cb) {
  var _this = this,
      duration = options.duration,//options is an object for easily adding features later.
      nameSpace = Object.keys(elem.data())[0] || 'timer',
      remain = -1,
      start,
      timer;

  this.isPaused = false;

  this.restart = function() {
    remain = -1;
    clearTimeout(timer);
    this.start();
  }

  this.start = function() {
    this.isPaused = false;
    // if(!elem.data('paused')){ return false; }//maybe implement this sanity check if used for other things.
    clearTimeout(timer);
    remain = remain <= 0 ? duration : remain;
    elem.data('paused', false);
    start = Date.now();
    timer = setTimeout(function(){
      if(options.infinite){
        _this.restart();//rerun the timer.
      }
      cb();
    }, remain);
    elem.trigger(`timerstart.zf.${nameSpace}`);
  }

  this.pause = function() {
    this.isPaused = true;
    //if(elem.data('paused')){ return false; }//maybe implement this sanity check if used for other things.
    clearTimeout(timer);
    elem.data('paused', true);
    var end = Date.now();
    remain = remain - (end - start);
    elem.trigger(`timerpaused.zf.${nameSpace}`);
  }
}

/**
 * Runs a callback function when images are fully loaded.
 * @param {Object} images - Image(s) to check if loaded.
 * @param {Func} callback - Function to execute when image is fully loaded.
 */
function onImagesLoaded(images, callback){
  var self = this,
      unloaded = images.length;

  if (unloaded === 0) {
    callback();
  }

  images.each(function() {
    if (this.complete) {
      singleImageLoaded();
    }
    else if (typeof this.naturalWidth !== 'undefined' && this.naturalWidth > 0) {
      singleImageLoaded();
    }
    else {
      $(this).one('load', function() {
        singleImageLoaded();
      });
    }
  });

  function singleImageLoaded() {
    unloaded--;
    if (unloaded === 0) {
      callback();
    }
  }
}

Foundation.Timer = Timer;
Foundation.onImagesLoaded = onImagesLoaded;

}(jQuery);
