+function ($) {
  'use strict';

  // BUTTON PUBLIC CLASS DEFINITION
  // ==============================

  var Button = function (element, options) {
    this.$element = $(element);
    this.options = $.extend({}, Button.DEFAULTS, options);

    this.$isLoading = false;
  };

  Button.VERSION = '1.0.0';
  Button.DEFAULTS = {
    loadingText: 'Loading...'
  };

  Button.prototype.constructor = Button;

  Button.prototype.setState = function (state) {
    var d = 'disabled';
    var $el = this.$element;
    var val = $el.is('input') ? 'val' : 'html';
    var data = $el.data();

    state = state + 'Text';

    if (data.resetText === null) $el.data('resetText', $el[val]());

    setTimeout($.proxy(function () {
      $el[val](data[state] === null ? this.options[state] : data[state]);

      if (state === 'loadingText') {
        this.$isLoading = true;
        $el.addClass(d)
          .attr(d, d);
      } else if (this.$isLoading) {
        this.$isLoading = false;
        $el.removeClass(d)
          .removeAttr(d);
      }
    }, this), 0);
  };

  Button.prototype.toggle = function () {
    var changed = true;
    var $parent = this.$element.closest('[data-toggle="buttons"]');

    if ($parent.length) {
      var $input = this.$element.find('input');

      if ($input.prop('type') === 'radio') {
        if ($input.prop('checked') && this.$element.hasClass('active')) {
          changed = false;
        } else {
         $parent.find('.active').removeClass('active');
        }
      }

      if (changed) {
        $input.prop('checked', !this.$element.hasClass('active'))
          .trigger('change');
      }
    } else {
      this.$element.attr('aria-pressed', !this.$element.hasClass('active'));
    }

    if (changed) this.$element.toggleClass('active');
  };

  // BUTTON PLUGIN DEFINITION
  // ========================

  function Plugin(option) {
    return this.each(function () {
      var $this = $(this);
      var data = $this.data('bs.button');
      var options = typeof option === 'object' && option;

      if (!data) $this.data('bs.button', (data = new Button(this, options)));

      if (option === 'toggle') {
        data.toggle();
      } else if (option) {
        data.setState(option);
      }
    });
  }

  var old = $.fn.button;

  $.fn.button = Plugin;
  $.fn.button.Constructor = Button;

  // BUTTON NO CONFLICT
  // ==================

  $.fn.button.noConflict = function () {
    $.fn.button = old;
    return this;
  };

  // BUTTON DATA-API
  // ===============

  $(document)
    .on('click.bs.button.data-api', '[data-toggle^="button"]', function (e) {
      var $btn = $(e.target);

      if (!$btn.hasClass('btn')) {
        $btn = $btn.closest('.btn');
      }

      Plugin.call($btn, 'toggle');
      e.preventDefault();
    })
    .on('focus.bs.button.data-api blur.bs.button.data-api', '[data-toggle^="button"]', function (e) {
      $(e.target).closest('.btn')
        .toggleClass('focus', /^focus(in)?$/.test(e.type));
    });

}(jQuery);