/*
* jQuery UI selectmenu
*
* Copyright (c) 2009 AUTHORS.txt (http://jqueryui.com/about)
* Dual licensed under the MIT (MIT-LICENSE.txt)
* and GPL (GPL-LICENSE.txt) licenses.
*
* http://docs.jquery.com/UI
*/

(function($) {

  $.widget("ui.selectmenu", {
    _init: function() {
      var self = this, o = this.options;

      //quick array of button and menu id's
      var num = Math.round(Math.random() * 1000);
      this.ids = [this.element.attr('id') + '_' + 'button' + '_' + num, this.element.attr('id') + '_' + 'menu' + '_' + num];

      //define safe mouseup for future toggling
      this._safemouseup = true;

      //create menu button wrapper
      this.newelement = $('<a class="' + this.widgetBaseClass + ' ui-widget ui-state-default ui-corner-all" id="' + this.ids[0] + '" role="button" href="#" aria-haspopup="true" aria-owns="' + this.ids[1] + '" aria-expanded="false"></a>')
			.insertAfter(this.element);

      //transfer tabindex
      var tabindex = this.element.attr('tabindex') || '0';
      this.newelement.attr('tabindex', tabindex);

      //save reference to select in data for ease in calling methods
      this.newelement.data('selectelement', this.element);

      //menu icon
      this.selectmenuIcon = $('<span class="' + this.widgetBaseClass + '-icon ui-icon"></span>')
			.prependTo(this.newelement)
			.addClass((o.style == "popup") ? 'ui-icon-triangle-2-n-s' : 'ui-icon-triangle-1-s');


      //make associated form label trigger focus
      $('label[for=' + this.element.attr('id') + ']')
			.attr('for', this.ids[0])
			.bind('click', function() {
			  self.newelement.focus();
			  return false;
			});

      //click toggle for menu visibility
      this.newelement
			.bind('mousedown', function(event) {
			  self._toggle(event);
			  //make sure a click won't open/close instantly
			  if (o.style == "popup") {
			    self._safemouseup = false;
			    setTimeout(function() { self._safemouseup = true; }, 300);
			  }
			  return false;
			})
			.bind('click', function() {
			  return false;
			})
			.keydown(function(event) {
			  var ret = true;
			  switch (event.keyCode) {
			    case $.ui.keyCode.ENTER:
			      ret = true;
			      break;
			    case $.ui.keyCode.SPACE:
			      ret = false;
			      self._toggle(event);
			      break;
			    case $.ui.keyCode.UP:
			    case $.ui.keyCode.LEFT:
			      ret = false;
			      self._moveSelection(-1);
			      break;
			    case $.ui.keyCode.DOWN:
			    case $.ui.keyCode.RIGHT:
			      ret = false;
			      self._moveSelection(1);
			      break;
			    case $.ui.keyCode.TAB:
			      ret = true;
			      break;
			    default:
			      ret = false;
			      self._typeAhead(event.keyCode, 'mouseup');
			      break;
			  }
			  return ret;
			})
			.bind('mouseover focus', function() {
			  $(this).addClass(self.widgetBaseClass + '-focus ui-state-hover');
			})
			.bind('mouseout blur', function() {
			  $(this).removeClass(self.widgetBaseClass + '-focus ui-state-hover');
			});

      //document click closes menu
      $(document)
			.mousedown(function(event) {
			  self.close(event);
			});

      //change event on original selectmenu
      this.element
			.click(function() { this._refreshValue(); })
			.focus(function() { this.newelement.focus(); });

      //create menu portion, append to body
      var cornerClass = (o.style == "dropdown") ? " ui-corner-bottom" : " ui-corner-all"
      this.list = $('<ul class="' + self.widgetBaseClass + '-menu ui-widget ui-widget-content' + cornerClass + '" aria-hidden="true" role="listbox" aria-multiselectable="false" aria-labelledby="' + this.ids[0] + '" id="' + this.ids[1] + '"></ul>').appendTo('body');

      //serialize selectmenu element options	
      var selectOptionData = [];
      this.element
			.find('option')
			.each(function() {
			  selectOptionData.push({
			    value: $(this).attr('value'),
			    text: self._formatText(jQuery(this).text()),
			    selected: $(this).attr('selected'),
			    classes: $(this).attr('class'),
			    parentOptGroup: $(this).parent('optgroup').attr('label')
			  });
			});

      //active state class is only used in popup style
      var activeClass = (self.options.style == "popup") ? " ui-state-active" : "";

      //write li's
      for (var i in selectOptionData) {
        var thisLi = $('<li><a href="#" tabindex="-1" role="option" aria-selected="false">' + selectOptionData[i].text + '</a></li>')
				.data('index', i)
				.addClass(selectOptionData[i].classes)
				.data('optionClasses', selectOptionData[i].classes)
				.mouseup(function(event) {
				  if (self._safemouseup) {
				    var changed = $(this).data('index') != self._selectedIndex();
				    self.value($(this).data('index'));
				    self.select(event);
				    if (changed) { self.change(event); }
				    self.close(event, true);
				  }
				  return false;
				})
				.click(function() {
				  return false;
				})
				.bind('mouseover focus', function() {
				  self._selectedOptionLi().addClass(activeClass);
				  self._focusedOptionLi().removeClass(self.widgetBaseClass + '-item-focus ui-state-hover');
				  $(this).removeClass('ui-state-active').addClass(self.widgetBaseClass + '-item-focus ui-state-hover');
				})
				.bind('mouseout blur', function() {
				  if ($(this).is(self._selectedOptionLi())) { $(this).addClass(activeClass); }
				  $(this).removeClass(self.widgetBaseClass + '-item-focus ui-state-hover');
				});

        //optgroup or not...
        if (selectOptionData[i].parentOptGroup) {
          var optGroupName = self.widgetBaseClass + '-group-' + selectOptionData[i].parentOptGroup;
          if (this.list.find('li.' + optGroupName).size()) {
            this.list.find('li.' + optGroupName + ':last ul').append(thisLi);
          }
          else {
            $('<li class="' + self.widgetBaseClass + '-group ' + optGroupName + '"><span class="' + self.widgetBaseClass + '-group-label">' + selectOptionData[i].parentOptGroup + '</span><ul></ul></li>')
						.appendTo(this.list)
						.find('ul')
						.append(thisLi);
          }
        }
        else {
          thisLi.appendTo(this.list);
        }

        //this allows for using the scrollbar in an overflowed list
        this.list.bind('mousedown mouseup', function() { return false; });

        //append icon if option is specified
        if (o.icons) {
          for (var j in o.icons) {
            if (thisLi.is(o.icons[j].find)) {
              thisLi
							.data('optionClasses', selectOptionData[i].classes + ' ' + self.widgetBaseClass + '-hasIcon')
							.addClass(self.widgetBaseClass + '-hasIcon');
              var iconClass = o.icons[j].icon || "";

              thisLi
							.find('a:eq(0)')
							.prepend('<span class="' + self.widgetBaseClass + '-item-icon ui-icon ' + iconClass + '"></span>');
            }
          }
        }
      }

      //add corners to top and bottom menu items
      this.list.find('li:last').addClass("ui-corner-bottom");
      if (o.style == 'popup') { this.list.find('li:first').addClass("ui-corner-top"); }

      //transfer classes to selectmenu and list
      if (o.transferClasses) {
        var transferClasses = this.element.attr('class') || '';
        this.newelement.add(this.list).addClass(transferClasses);
      }

      //original selectmenu width
      var selectWidth = this.element.width();

      //set menu button width
      this.newelement.width((o.width) ? o.width : selectWidth);

      //set menu width to either menuWidth option value, width option value, or select width 
      if (o.style == 'dropdown') { this.list.width((o.menuWidth) ? o.menuWidth : ((o.width) ? o.width : selectWidth)); }
      else { this.list.width((o.menuWidth) ? o.menuWidth : ((o.width) ? o.width - o.handleWidth : selectWidth - o.handleWidth)); }

      //set max height from option 
      if (o.maxHeight && o.maxHeight < this.list.height()) { this.list.height(o.maxHeight); }

      //save reference to actionable li's (not group label li's)
      this._optionLis = this.list.find('li:not(.' + self.widgetBaseClass + '-group)');

      //transfer menu click to menu button
      this.list
			.keydown(function(event) {
			  var ret = true;
			  switch (event.keyCode) {
			    case $.ui.keyCode.UP:
			    case $.ui.keyCode.LEFT:
			      ret = false;
			      self._moveFocus(-1);
			      break;
			    case $.ui.keyCode.DOWN:
			    case $.ui.keyCode.RIGHT:
			      ret = false;
			      self._moveFocus(1);
			      break;
			    case $.ui.keyCode.HOME:
			      ret = false;
			      self._moveFocus(':first');
			      break;
			    case $.ui.keyCode.PAGE_UP:
			      ret = false;
			      self._scrollPage('up');
			      break;
			    case $.ui.keyCode.PAGE_DOWN:
			      ret = false;
			      self._scrollPage('down');
			      break;
			    case $.ui.keyCode.END:
			      ret = false;
			      self._moveFocus(':last');
			      break;
			    case $.ui.keyCode.ENTER:
			    case $.ui.keyCode.SPACE:
			      ret = false;
			      self.close(event, true);
			      $(event.target).parents('li:eq(0)').trigger('mouseup');
			      break;
			    case $.ui.keyCode.TAB:
			      ret = true;
			      self.close(event);
			      break;
			    case $.ui.keyCode.ESCAPE:
			      ret = false;
			      self.close(event, true);
			      break;
			    default:
			      ret = false;
			      self._typeAhead(event.keyCode, 'focus');
			      break;
			  }
			  return ret;
			});

      //selectmenu style
      if (o.style == 'dropdown') {
        this.newelement
				.addClass(self.widgetBaseClass + "-dropdown");
        this.list
				.addClass(self.widgetBaseClass + "-menu-dropdown");
      }
      else {
        this.newelement
				.addClass(self.widgetBaseClass + "-popup");
        this.list
				.addClass(self.widgetBaseClass + "-menu-popup");
      }

      //append status span to button
      this.newelement.prepend('<span class="' + self.widgetBaseClass + '-status">' + selectOptionData[this._selectedIndex()].text + '</span>');

      //hide original selectmenu element
      this.element.hide();

      //transfer disabled state
      if (this.element.attr('disabled') == true) { this.disable(); }

      //update value
      this.value(this._selectedIndex());
    },
    destroy: function() {
      this.element.removeData(this.widgetName)
			.removeClass(this.widgetBaseClass + '-disabled' + ' ' + this.namespace + '-state-disabled')
			.removeAttr('aria-disabled');

      //unbind click on label, reset its for attr
      $('label[for=' + this.newelement.attr('id') + ']')
			.attr('for', this.element.attr('id'))
			.unbind('click');
      this.newelement.remove();
      this.list.remove();
      this.element.show();
    },
    _typeAhead: function(code, eventType) {
      var self = this;
      //define self._prevChar if needed
      if (!self._prevChar) { self._prevChar = ['', 0]; }
      var C = String.fromCharCode(code);
      c = C.toLowerCase();
      var focusFound = false;
      function focusOpt(elem, ind) {
        focusFound = true;
        $(elem).trigger(eventType);
        self._prevChar[1] = ind;
      };
      this.list.find('li a').each(function(i) {
        if (!focusFound) {
          var thisText = $(this).text();
          if (thisText.indexOf(C) == 0 || thisText.indexOf(c) == 0) {
            if (self._prevChar[0] == C) {
              if (self._prevChar[1] < i) { focusOpt(this, i); }
            }
            else { focusOpt(this, i); }
          }
        }
      });
      this._prevChar[0] = C;
    },
    _uiHash: function() {
      return {
        value: this.value()
      };
    },
    open: function(event) {
      var self = this;
      this._refreshPosition();
      this._closeOthers(event);
      this.newelement
			.attr('aria-expanded', true)
			.addClass('ui-state-active');

      this.list
			.appendTo('body')
			.addClass(self.widgetBaseClass + '-open')
			.attr('aria-hidden', false)
			.find('li:not(.' + self.widgetBaseClass + '-group):eq(' + this._selectedIndex() + ') a').focus();
      if (this.options.style == "dropdown") { this.newelement.removeClass('ui-corner-all').addClass('ui-corner-top'); }
      this._refreshPosition();
      this._trigger("open", event, this._uiHash());
    },
    close: function(event, retainFocus) {
      if (this.newelement.is('.ui-state-active')) {
        this.newelement
				.attr('aria-expanded', false)
				.removeClass('ui-state-active');
        this.list
				.attr('aria-hidden', true)
				.removeClass(this.widgetBaseClass + '-open');
        if (this.options.style == "dropdown") { this.newelement.removeClass('ui-corner-top').addClass('ui-corner-all'); }
        if (retainFocus) { this.newelement.focus(); }
        this._trigger("close", event, this._uiHash());
      }
    },
    change: function(event) {
      this.element.trigger('change');
      this._trigger("change", event, this._uiHash());
    },
    select: function(event) {
      this._trigger("select", event, this._uiHash());
    },
    _closeOthers: function(event) {
      $('.' + this.widgetBaseClass + '.ui-state-active').not(this.newelement).each(function() {
        $(this).data('selectelement').selectmenu('close', event);
      });
      $('.' + this.widgetBaseClass + '.ui-state-hover').trigger('mouseout');
    },
    _toggle: function(event, retainFocus) {
      if (this.list.is('.' + this.widgetBaseClass + '-open')) { this.close(event, retainFocus); }
      else { this.open(event); }
    },
    _formatText: function(text) {
      return this.options.format ? this.options.format(text) : text;
    },
    _selectedIndex: function() {
      return this.element[0].selectedIndex;
    },
    _selectedOptionLi: function() {
      return this._optionLis.eq(this._selectedIndex());
    },
    _focusedOptionLi: function() {
      return this.list.find('.' + this.widgetBaseClass + '-item-focus');
    },
    _moveSelection: function(amt) {
      var currIndex = parseInt(this._selectedOptionLi().data('index'), 10);
      var newIndex = currIndex + amt;
      return this._optionLis.eq(newIndex).trigger('mouseup');
    },
    _moveFocus: function(amt) {
      if (!isNaN(amt)) {
        var currIndex = parseInt(this._focusedOptionLi().data('index'), 10);
        var newIndex = currIndex + amt;
      }
      else { var newIndex = parseInt(this._optionLis.filter(amt).data('index'), 10); }

      if (newIndex < 0) { newIndex = 0; }
      if (newIndex > this._optionLis.size() - 1) {
        newIndex = this._optionLis.size() - 1;
      }
      this._focusedOptionLi().find('a:eq(0)').blur();
      this._optionLis.eq(newIndex).find('a:eq(0)').focus();
    },
    _scrollPage: function(direction) {
      var numPerPage = Math.floor(this.list.outerHeight() / this.list.find('li:first').outerHeight());
      numPerPage = (direction == 'up') ? -numPerPage : numPerPage;
      this._moveFocus(numPerPage);
    },
    _setData: function(key, value) {
      this.options[key] = value;
      if (key == 'disabled') {
        this.element
				.add(this.newelement)
				.add(this.list)
					[value ? 'addClass' : 'removeClass'](
						this.widgetBaseClass + '-disabled' + ' ' +
						this.namespace + '-state-disabled')
					.attr("aria-disabled", value);
      }
    },
    value: function(newValue) {
      if (arguments.length) {
        this.element[0].selectedIndex = newValue;
        this._refreshValue();
        this._refreshPosition();
      }
      return this.element[0].selectedIndex;
    },
    _refreshValue: function() {
      var activeClass = (this.options.style == "popup") ? " ui-state-active" : "";
      //deselect previous
      this.list
			.find('.' + this.widgetBaseClass + '-item-selected')
			.removeClass(this.widgetBaseClass + "-item-selected" + activeClass)
			.find('a')
			.attr('aria-selected', 'false');
      //select new
      this._selectedOptionLi()
			.addClass(this.widgetBaseClass + "-item-selected" + activeClass)
			.find('a')
			.attr('aria-selected', 'true');
      //toggle any class brought in from option
      var currentOptionClasses = this.newelement.data('optionClasses') ? this.newelement.data('optionClasses') : "";
      var newOptionClasses = this._selectedOptionLi().data('optionClasses') ? this._selectedOptionLi().data('optionClasses') : "";
      this.newelement
			.removeClass(currentOptionClasses)
			.data('optionClasses', newOptionClasses)
			.addClass(newOptionClasses)
			.find('.' + this.widgetBaseClass + '-status')
			.html(
				this._selectedOptionLi()
					.find('a:eq(0)')
					.html()
			);
    },
    _refreshPosition: function() {
      //set left value
      this.list.css('left', this.newelement.offset().left);

      //set top value
      var menuTop = this.newelement.offset().top;
      var scrolledAmt = this.list[0].scrollTop;
      this.list.find('li:lt(' + this._selectedIndex() + ')').each(function() {
        scrolledAmt -= $(this).outerHeight();
      });

      if (this.newelement.is('.' + this.widgetBaseClass + '-popup')) {
        menuTop += scrolledAmt;
        this.list.css('top', menuTop);
      }
      else {
        menuTop += this.newelement.height();
        this.list.css('top', menuTop);
      }
    }
  });

  $.extend($.ui.selectmenu, {
    getter: "value",
    version: "@VERSION",
    eventPrefix: "selectmenu",
    defaults: {
      transferClasses: true,
      style: 'popup',
      width: null,
      menuWidth: null,
      handleWidth: 26,
      maxHeight: null,
      icons: null,
      format: null
    }
  });

})(jQuery);