import Ember from 'ember';

import humanTime from '../utils/human-time';

var $ = Ember.$;

export default {
  name: 'human-time-updater',
  initialize: function(container) {

    // Livestamp.js / v1.1.2 / (c) 2012 Matt Bradley / MIT License
    // @todo rewrite this to be simpler and cleaner
	(function($, moment) {
	  var updateInterval = 1e3,
	      paused = false,
	      $livestamps = $([]),

	  init = function() {
	    livestampGlobal.resume();
	  },

	  prep = function($el, timestamp) {
	    var oldData = $el.data('livestampdata');
	    if (typeof timestamp == 'number')
	      timestamp *= 1e3;

	    $el.removeAttr('data-livestamp')
	      .removeData('livestamp');

	    timestamp = moment(timestamp);
	    if (moment.isMoment(timestamp) && !isNaN(+timestamp)) {
	      var newData = $.extend({ }, { 'original': $el.contents() }, oldData);
	      newData.moment = moment(timestamp);

	      $el.data('livestampdata', newData).empty();
	      $livestamps.push($el[0]);
	    }
	  },

	  run = function() {
	    if (paused) return;
	    livestampGlobal.update();
	    setTimeout(run, updateInterval);
	  },

	  livestampGlobal = {
	    update: function() {
	      $('[data-humantime]').each(function() {
	        var $this = $(this);
	        prep($this, $this.attr('datetime'));
	      });

	      var toRemove = [];
	      $livestamps.each(function() {
	        var $this = $(this),
	            data = $this.data('livestampdata');

	        if (data === undefined)
	          toRemove.push(this);
	        else if (moment.isMoment(data.moment)) {
	          var from = $this.html(),
	          	to = humanTime(data.moment);
	              // to = data.moment.fromNow();

	          if (from != to) {
	            var e = $.Event('change.livestamp');
	            $this.trigger(e, [from, to]);
	            if (!e.isDefaultPrevented())
	              $this.html(to);
	          }
	        }
	      });

	      $livestamps = $livestamps.not(toRemove);
	    },

	    pause: function() {
	      paused = true;
	    },

	    resume: function() {
	      paused = false;
	      run();
	    },

	    interval: function(interval) {
	      if (interval === undefined)
	        return updateInterval;
	      updateInterval = interval;
	    }
	  },

	  livestampLocal = {
	    add: function($el, timestamp) {
	      if (typeof timestamp == 'number')
	        timestamp *= 1e3;
	      timestamp = moment(timestamp);

	      if (moment.isMoment(timestamp) && !isNaN(+timestamp)) {
	        $el.each(function() {
	          prep($(this), timestamp);
	        });
	        livestampGlobal.update();
	      }

	      return $el;
	    },

	    destroy: function($el) {
	      $livestamps = $livestamps.not($el);
	      $el.each(function() {
	        var $this = $(this),
	            data = $this.data('livestampdata');

	        if (data === undefined)
	          return $el;

	        $this
	          .html(data.original ? data.original : '')
	          .removeData('livestampdata');
	      });

	      return $el;
	    },

	    isLivestamp: function($el) {
	      return $el.data('livestampdata') !== undefined;
	    }
	  };

	  $.livestamp = livestampGlobal;
	  $(init);
	  $.fn.livestamp = function(method, options) {
	    if (!livestampLocal[method]) {
	      options = method;
	      method = 'add';
	    }

	    return livestampLocal[method](this, options);
	  };
	})(jQuery, moment);

  }
};