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/* jshint forin:true, noarg:true, noempty:true, eqeqeq:true, boss:true, undef:true, curly:true, browser:true, jquery:true */

/*

 * jQuery MultiSelect UI Widget 1.14pre

 * Copyright (c) 2012 Eric Hynds

 *

 * http://www.erichynds.com/jquery/jquery-ui-multiselect-widget/

 *

 * Depends:

 *   - jQuery 1.4.2+

 *   - jQuery UI 1.8 widget factory

 *

 * Optional:

 *   - jQuery UI effects

 *   - jQuery UI position utility

 *

 * Dual licensed under the MIT and GPL licenses:

 *   http://www.opensource.org/licenses/mit-license.php

 *   http://www.gnu.org/licenses/gpl.html

 *

 */

(function($, undefined) {

  var multiselectID = 0;

  var $doc = $(document);

  $.widget("ech.multiselect", {

    // default options

    options: {

      header: true,

      height: 175,

      minWidth: 225,

      classes: '',

      checkAllText: 'Check all',

      uncheckAllText: 'Uncheck all',

      noneSelectedText: 'Select options',

      selectedText: '# selected',

      selectedList: 0,

      show: null,

      hide: null,

      autoOpen: false,

      multiple: true,

      position: {},

      appendTo: "body"

    },

    _create: function() {

      var el = this.element.hide();

      var o = this.options;

      this.speed = $.fx.speeds._default; // default speed for effects

      this._isOpen = false; // assume no

      // create a unique namespace for events that the widget

      // factory cannot unbind automatically. Use eventNamespace if on

      // jQuery UI 1.9+, and otherwise fallback to a custom string.

      this._namespaceID = this.eventNamespace || ('multiselect' + multiselectID);

      var button = (this.button = $('<button type="button"><span class="ui-icon ui-icon-triangle-1-s"></span></button>'))

        .addClass('ui-multiselect ui-widget ui-state-default ui-corner-all')

        .addClass(o.classes)

        .attr({ 'title':el.attr('title'), 'aria-haspopup':true, 'tabIndex':el.attr('tabIndex') })

        .insertAfter(el),

        buttonlabel = (this.buttonlabel = $('<span />'))

          .html(o.noneSelectedText)

          .appendTo(button),

        menu = (this.menu = $('<div />'))

          .addClass('ui-multiselect-menu ui-widget ui-widget-content ui-corner-all')

          .addClass(o.classes)

          .appendTo($(o.appendTo)),

        header = (this.header = $('<div />'))

          .addClass('ui-widget-header ui-corner-all ui-multiselect-header ui-helper-clearfix')

          .appendTo(menu),

        headerLinkContainer = (this.headerLinkContainer = $('<ul />'))

          .addClass('ui-helper-reset')

          .html(function() {

            if(o.header === true) {

              return '<li><a class="ui-multiselect-all" href="#"><span class="ui-icon ui-icon-check"></span><span>' + o.checkAllText + '</span></a></li><li><a class="ui-multiselect-none" href="#"><span class="ui-icon ui-icon-closethick"></span><span>' + o.uncheckAllText + '</span></a></li>';

            } else if(typeof o.header === "string") {

              return '<li>' + o.header + '</li>';

            } else {

              return '';

            }

          })

          .append('<li class="ui-multiselect-close"><a href="#" class="ui-multiselect-close"><span class="ui-icon ui-icon-circle-close"></span></a></li>')

          .appendTo(header),

        checkboxContainer = (this.checkboxContainer = $('<ul />'))

          .addClass('ui-multiselect-checkboxes ui-helper-reset')

          .appendTo(menu);

        // perform event bindings

        this._bindEvents();

        // build menu

        this.refresh(true);

        // some addl. logic for single selects

        if(!o.multiple) {

          menu.addClass('ui-multiselect-single');

        }

        // bump unique ID

        multiselectID++;

    },

    _init: function() {

      if(this.options.header === false) {

        this.header.hide();

      }

      if(!this.options.multiple) {

        this.headerLinkContainer.find('.ui-multiselect-all, .ui-multiselect-none').hide();

      }

      if(this.options.autoOpen) {

        this.open();

      }

      if(this.element.is(':disabled')) {

        this.disable();

      }

    },

    refresh: function(init) {

      var el = this.element;

      var o = this.options;

      var menu = this.menu;

      var checkboxContainer = this.checkboxContainer;

      var optgroups = [];

      var html = "";

      var id = el.attr('id') || multiselectID++; // unique ID for the label & option tags

      // build items

      el.find('option').each(function(i) {

        var $this = $(this);

        var parent = this.parentNode;

        var description = this.innerHTML;

        var title = this.title;

        var value = this.value;

        var inputID = 'ui-multiselect-' + (this.id || id + '-option-' + i);

        var isDisabled = this.disabled;

        var isSelected = this.selected;

        var labelClasses = [ 'ui-corner-all' ];

        var liClasses = (isDisabled ? 'ui-multiselect-disabled ' : ' ') + this.className;

        var optLabel;

        // is this an optgroup?

        if(parent.tagName === 'OPTGROUP') {

          optLabel = parent.getAttribute('label');

          // has this optgroup been added already?

          if($.inArray(optLabel, optgroups) === -1) {

            html += '<li class="ui-multiselect-optgroup-label ' + parent.className + '"><a href="#">' + optLabel + '</a></li>';

            optgroups.push(optLabel);

          }

        }

        if(isDisabled) {

          labelClasses.push('ui-state-disabled');

        }

        // browsers automatically select the first option

        // by default with single selects

        if(isSelected && !o.multiple) {

          labelClasses.push('ui-state-active');

        }

        html += '<li class="' + liClasses + '">';

        // create the label

        html += '<label for="' + inputID + '" title="' + title + '" class="' + labelClasses.join(' ') + '">';

        html += '<input id="' + inputID + '" name="multiselect_' + id + '" type="' + (o.multiple ? "checkbox" : "radio") + '" value="' + value + '" title="' + title + '"';

        // pre-selected?

        if(isSelected) {

          html += ' checked="checked"';

          html += ' aria-selected="true"';

        }

        // disabled?

        if(isDisabled) {

          html += ' disabled="disabled"';

          html += ' aria-disabled="true"';

        }

        // add the title and close everything off

        html += ' /><span>' + description + '</span></label></li>';

      });

      // insert into the DOM

      checkboxContainer.html(html);

      // cache some moar useful elements

      this.labels = menu.find('label');

      this.inputs = this.labels.children('input');

      // set widths

      this._setButtonWidth();

      this._setMenuWidth();

      // remember default value

      this.button[0].defaultValue = this.update();

      // broadcast refresh event; useful for widgets

      if(!init) {

        this._trigger('refresh');

      }

    },

    // updates the button text. call refresh() to rebuild

    update: function() {

      var o = this.options;

      var $inputs = this.inputs;

      var $checked = $inputs.filter(':checked');

      var numChecked = $checked.length;

      var value;

      if(numChecked === 0) {

        value = o.noneSelectedText;

      } else {

        if($.isFunction(o.selectedText)) {

          value = o.selectedText.call(this, numChecked, $inputs.length, $checked.get());

        } else if(/\d/.test(o.selectedList) && o.selectedList > 0 && numChecked <= o.selectedList) {

          value = $checked.map(function() { return $(this).next().html(); }).get().join(', ');

        } else {

          value = o.selectedText.replace('#', numChecked).replace('#', $inputs.length);

        }

      }

      this._setButtonValue(value);

      return value;

    },

    // this exists as a separate method so that the developer 

    // can easily override it.

    _setButtonValue: function(value) {

      this.buttonlabel.text(value);

    },

    // binds events

    _bindEvents: function() {

      var self = this;

      var button = this.button;

      function clickHandler() {

        self[ self._isOpen ? 'close' : 'open' ]();

        return false;

      }

      // webkit doesn't like it when you click on the span :(

      button

        .find('span')

        .bind('click.multiselect', clickHandler);

      // button events

      button.bind({

        click: clickHandler,

        keypress: function(e) {

          switch(e.which) {

            case 27: // esc

              case 38: // up

              case 37: // left

              self.close();

            break;

            case 39: // right

              case 40: // down

              self.open();

            break;

          }

        },

        mouseenter: function() {

          if(!button.hasClass('ui-state-disabled')) {

            $(this).addClass('ui-state-hover');

          }

        },

        mouseleave: function() {

          $(this).removeClass('ui-state-hover');

        },

        focus: function() {

          if(!button.hasClass('ui-state-disabled')) {

            $(this).addClass('ui-state-focus');

          }

        },

        blur: function() {

          $(this).removeClass('ui-state-focus');

        }

      });

      // header links

      this.header.delegate('a', 'click.multiselect', function(e) {

        // close link

        if($(this).hasClass('ui-multiselect-close')) {

          self.close();

          // check all / uncheck all

        } else {

          self[$(this).hasClass('ui-multiselect-all') ? 'checkAll' : 'uncheckAll']();

        }

        e.preventDefault();

      });

      // optgroup label toggle support

      this.menu.delegate('li.ui-multiselect-optgroup-label a', 'click.multiselect', function(e) {

        e.preventDefault();

        var $this = $(this);

        var $inputs = $this.parent().nextUntil('li.ui-multiselect-optgroup-label').find('input:visible:not(:disabled)');

        var nodes = $inputs.get();

        var label = $this.parent().text();

        // trigger event and bail if the return is false

        if(self._trigger('beforeoptgrouptoggle', e, { inputs:nodes, label:label }) === false) {

          return;

        }

        // toggle inputs

        self._toggleChecked(

          $inputs.filter(':checked').length !== $inputs.length,

          $inputs

        );

        self._trigger('optgrouptoggle', e, {

          inputs: nodes,

          label: label,

          checked: nodes[0].checked

        });

      })

      .delegate('label', 'mouseenter.multiselect', function() {

        if(!$(this).hasClass('ui-state-disabled')) {

          self.labels.removeClass('ui-state-hover');

          $(this).addClass('ui-state-hover').find('input').focus();

        }

      })

      .delegate('label', 'keydown.multiselect', function(e) {

        e.preventDefault();

        switch(e.which) {

          case 9: // tab

            case 27: // esc

            self.close();

          break;

          case 38: // up

            case 40: // down

            case 37: // left

            case 39: // right

            self._traverse(e.which, this);

          break;

          case 13: // enter

            $(this).find('input')[0].click();

          break;

        }

      })

      .delegate('input[type="checkbox"], input[type="radio"]', 'click.multiselect', function(e) {

        var $this = $(this);

        var val = this.value;

        var checked = this.checked;

        var tags = self.element.find('option');

        // bail if this input is disabled or the event is cancelled

        if(this.disabled || self._trigger('click', e, { value: val, text: this.title, checked: checked }) === false) {

          e.preventDefault();

          return;

        }

        // make sure the input has focus. otherwise, the esc key

        // won't close the menu after clicking an item.

        $this.focus();

        // toggle aria state

        $this.attr('aria-selected', checked);

        // change state on the original option tags

        tags.each(function() {

          if(this.value === val) {

            this.selected = checked;

          } else if(!self.options.multiple) {

            this.selected = false;

          }

        });

        // some additional single select-specific logic

        if(!self.options.multiple) {

          self.labels.removeClass('ui-state-active');

          $this.closest('label').toggleClass('ui-state-active', checked);

          // close menu

          self.close();

        }

        // fire change on the select box

        self.element.trigger("change");

        // setTimeout is to fix multiselect issue #14 and #47. caused by jQuery issue #3827

        // http://bugs.jquery.com/ticket/3827

        setTimeout($.proxy(self.update, self), 10);

      });

      // close each widget when clicking on any other element/anywhere else on the page

      $doc.bind('mousedown.' + this._namespaceID, function(event) {

        var target = event.target;

        if(self._isOpen

            && target !== self.button[0]

            && target !== self.menu[0]

            && !$.contains(self.menu[0], target)

            && !$.contains(self.button[0], target)

          ) {

          self.close();

        }

      });

      // deal with form resets.  the problem here is that buttons aren't

      // restored to their defaultValue prop on form reset, and the reset

      // handler fires before the form is actually reset.  delaying it a bit

      // gives the form inputs time to clear.

      $(this.element[0].form).bind('reset.multiselect', function() {

        setTimeout($.proxy(self.refresh, self), 10);

      });

    },

    // set button width

    _setButtonWidth: function() {

      var width = this.element.outerWidth();

      var o = this.options;

      if(/\d/.test(o.minWidth) && width < o.minWidth) {

        width = o.minWidth;

      }

      // set widths

      this.button.outerWidth(width);

    },

    // set menu width

    _setMenuWidth: function() {

      var m = this.menu;

      m.outerWidth(this.button.outerWidth());

    },

    // move up or down within the menu

    _traverse: function(which, start) {

      var $start = $(start);

      var moveToLast = which === 38 || which === 37;

      // select the first li that isn't an optgroup label / disabled

      var $next = $start.parent()[moveToLast ? 'prevAll' : 'nextAll']('li:not(.ui-multiselect-disabled, .ui-multiselect-optgroup-label)').first();

      // if at the first/last element

      if(!$next.length) {

        var $container = this.menu.find('ul').last();

        // move to the first/last

        this.menu.find('label')[ moveToLast ? 'last' : 'first' ]().trigger('mouseover');

        // set scroll position

        $container.scrollTop(moveToLast ? $container.height() : 0);

      } else {

        $next.find('label').trigger('mouseover');

      }

    },

    // This is an internal function to toggle the checked property and

    // other related attributes of a checkbox.

    //

    // The context of this function should be a checkbox; do not proxy it.

    _toggleState: function(prop, flag) {

      return function() {

        if(!this.disabled) {

          this[ prop ] = flag;

        }

        if(flag) {

          this.setAttribute('aria-selected', true);

        } else {

          this.removeAttribute('aria-selected');

        }

      };

    },

    _toggleChecked: function(flag, group) {

      var $inputs = (group && group.length) ?  group : this.inputs;

      var self = this;

      // toggle state on inputs

      $inputs.each(this._toggleState('checked', flag));

      // give the first input focus

      $inputs.eq(0).focus();

      // update button text

      this.update();

      // gather an array of the values that actually changed

      var values = $inputs.map(function() {

        return this.value;

      }).get();

      // toggle state on original option tags

      this.element

        .find('option')

        .each(function() {

          if(!this.disabled && $.inArray(this.value, values) > -1) {

            self._toggleState('selected', flag).call(this);

          }

        });

      // trigger the change event on the select

      if($inputs.length) {

        this.element.trigger("change");

      }

    },

    _toggleDisabled: function(flag) {

      this.button.attr({ 'disabled':flag, 'aria-disabled':flag })[ flag ? 'addClass' : 'removeClass' ]('ui-state-disabled');

      var inputs = this.menu.find('input');

      var key = "ech-multiselect-disabled";

      if(flag) {

        // remember which elements this widget disabled (not pre-disabled)

        // elements, so that they can be restored if the widget is re-enabled.

        inputs = inputs.filter(':enabled').data(key, true)

      } else {

        inputs = inputs.filter(function() {

          return $.data(this, key) === true;

        }).removeData(key);

      }

      inputs

        .attr({ 'disabled':flag, 'arial-disabled':flag })

        .parent()[ flag ? 'addClass' : 'removeClass' ]('ui-state-disabled');

      this.element.attr({

        'disabled':flag,

        'aria-disabled':flag

      });

    },

    // open the menu

    open: function(e) {

      var self = this;

      var button = this.button;

      var menu = this.menu;

      var speed = this.speed;

      var o = this.options;

      var args = [];

      // bail if the multiselectopen event returns false, this widget is disabled, or is already open

      if(this._trigger('beforeopen') === false || button.hasClass('ui-state-disabled') || this._isOpen) {

        return;

      }

      var $container = menu.find('ul').last();

      var effect = o.show;

      // figure out opening effects/speeds

      if($.isArray(o.show)) {

        effect = o.show[0];

        speed = o.show[1] || self.speed;

      }

      // if there's an effect, assume jQuery UI is in use

      // build the arguments to pass to show()

      if(effect) {

        args = [ effect, speed ];

      }

      // set the scroll of the checkbox container

      $container.scrollTop(0).height(o.height);

      // positon

      this.position();

      // show the menu, maybe with a speed/effect combo

      $.fn.show.apply(menu, args);

      // select the first not disabled option

      // triggering both mouseover and mouseover because 1.4.2+ has a bug where triggering mouseover

      // will actually trigger mouseenter.  the mouseenter trigger is there for when it's eventually fixed

      this.labels.filter(':not(.ui-state-disabled)').eq(0).trigger('mouseover').trigger('mouseenter').find('input').trigger('focus');

      button.addClass('ui-state-active');

      this._isOpen = true;

      this._trigger('open');

    },

    // close the menu

    close: function() {

      if(this._trigger('beforeclose') === false) {

        return;

      }

      var o = this.options;

      var effect = o.hide;

      var speed = this.speed;

      var args = [];

      // figure out opening effects/speeds

      if($.isArray(o.hide)) {

        effect = o.hide[0];

        speed = o.hide[1] || this.speed;

      }

      if(effect) {

        args = [ effect, speed ];

      }

      $.fn.hide.apply(this.menu, args);

      this.button.removeClass('ui-state-active').trigger('blur').trigger('mouseleave');

      this._isOpen = false;

      this._trigger('close');

    },

    enable: function() {

      this._toggleDisabled(false);

    },

    disable: function() {

      this._toggleDisabled(true);

    },

    checkAll: function(e) {

      this._toggleChecked(true);

      this._trigger('checkAll');

    },

    uncheckAll: function() {

      this._toggleChecked(false);

      this._trigger('uncheckAll');

    },

    getChecked: function() {

      return this.menu.find('input').filter(':checked');

    },

    destroy: function() {

      // remove classes + data

      $.Widget.prototype.destroy.call(this);

      // unbind events

      $doc.unbind(this._namespaceID);

      this.button.remove();

      this.menu.remove();

      this.element.show();

      return this;

    },

    isOpen: function() {

      return this._isOpen;

    },

    widget: function() {

      return this.menu;

    },

    getButton: function() {

      return this.button;

    },

    position: function() {

      var o = this.options;

      // use the position utility if it exists and options are specifified

      if($.ui.position && !$.isEmptyObject(o.position)) {

        o.position.of = o.position.of || this.button;

        this.menu

          .show()

          .position(o.position)

          .hide();

        // otherwise fallback to custom positioning

      } else {

        var pos = this.button.offset();

        this.menu.css({

          top: pos.top + this.button.outerHeight(),

          left: pos.left

        });

      }

    },

    // react to option changes after initialization

    _setOption: function(key, value) {

      var menu = this.menu;

      switch(key) {

        case 'header':

          menu.find('div.ui-multiselect-header')[value ? 'show' : 'hide']();

          break;

        case 'checkAllText':

          menu.find('a.ui-multiselect-all span').eq(-1).text(value);

          break;

        case 'uncheckAllText':

          menu.find('a.ui-multiselect-none span').eq(-1).text(value);

          break;

        case 'height':

          menu.find('ul').last().height(parseInt(value, 10));

          break;

        case 'minWidth':

          this.options[key] = parseInt(value, 10);

          this._setButtonWidth();

          this._setMenuWidth();

          break;

        case 'selectedText':

        case 'selectedList':

        case 'noneSelectedText':

          this.options[key] = value; // these all needs to update immediately for the update() call

          this.update();

          break;

        case 'classes':

          menu.add(this.button).removeClass(this.options.classes).addClass(value);

          break;

        case 'multiple':

          menu.toggleClass('ui-multiselect-single', !value);

          this.options.multiple = value;

          this.element[0].multiple = value;

          this.refresh();

          break;

        case 'position':

          this.position();

      }

      $.Widget.prototype._setOption.apply(this, arguments);

    }

  });

})(jQuery);