;(function ($, window, document, undefined) {
  'use strict';

  Foundation.libs.equalizer = {
    name : 'equalizer',

    version : '{{VERSION}}',

    settings : {
      use_tallest : true,
      before_height_change : $.noop,
      after_height_change : $.noop,
      equalize_on_stack : false,
      act_on_hidden_el: false
    },

    init : function (scope, method, options) {
      Foundation.inherit(this, 'image_loaded');
      this.bindings(method, options);
      this.reflow();
    },

    events : function () {
      this.S(window).off('.equalizer').on('resize.fndtn.equalizer', function (e) {
        this.reflow();
      }.bind(this));
    },

    equalize : function (equalizer) {
      var isStacked = false,
          group = equalizer.data('equalizer'),
          settings = equalizer.data(this.attr_name(true)+'-init') || this.settings,
          vals,
          firstTopOffset;

      if (settings.act_on_hidden_el) {
        vals = group ? equalizer.find('['+this.attr_name()+'-watch="'+group+'"]') : equalizer.find('['+this.attr_name()+'-watch]');
      }
      else {
        vals = group ? equalizer.find('['+this.attr_name()+'-watch="'+group+'"]:visible') : equalizer.find('['+this.attr_name()+'-watch]:visible');
      }
      
      if (vals.length === 0) {
        return;
      }

      settings.before_height_change();
      equalizer.trigger('before-height-change.fndth.equalizer');
      vals.height('inherit');

      if (settings.equalize_on_stack === false) {
        firstTopOffset = vals.first().offset().top;
        vals.each(function () {
          if ($(this).offset().top !== firstTopOffset) {
            isStacked = true;
            return false;
          }
        });
        if (isStacked) {
          return;
        }
      }

      var heights = vals.map(function () { return $(this).outerHeight(false) }).get();

      if (settings.use_tallest) {
        var max = Math.max.apply(null, heights);
        vals.css('height', max);
      } else {
        var min = Math.min.apply(null, heights);
        vals.css('height', min);
      }

      settings.after_height_change();
      equalizer.trigger('after-height-change.fndtn.equalizer');
    },

    reflow : function () {
      var self = this;

      this.S('[' + this.attr_name() + ']', this.scope).each(function () {
        var $eq_target = $(this),
            media_query = $eq_target.data('equalizer-mq'),
            ignore_media_query = true;

        if (media_query) {
          media_query = 'is_' + media_query.replace(/-/g, '_');
          if (Foundation.utils.hasOwnProperty(media_query)) {
            ignore_media_query = false;
          }
        }

        self.image_loaded(self.S('img', this), function () {
          if (ignore_media_query || Foundation.utils[media_query]()) {
            self.equalize($eq_target)
          } else {
            var vals = $eq_target.find('[' + self.attr_name() + '-watch]:visible');
            vals.css('height', 'auto');
          }
        });
      });
    }
  };
})(jQuery, window, window.document);