/*
Stylish Select 0.3 - $ plugin to replace a select drop down box with a stylable unordered list
http://scottdarby.com/

Copyright (c) 2009 Scott Darby

Requires: $ 1.3

Licensed under the GPL license:
http://www.gnu.org/licenses/gpl.html
*/
(function($){

  //add class of js to html tag
  $('html').addClass('js');

  //create cross-browser indexOf
  Array.prototype.indexOf = function (obj, start) {
    for (var i = (start || 0); i < this.length; i++) {
      if (this[i] == obj) {
        return i;
      }
    }
  }
  
  //utility methods
  $.fn.extend({
    getSetSSValue: function(value){
            if (value){
              //set value and trigger change event
              $(this).val(value).change();
              return this;
            } else {
              return selText = $(this).find(':selected').text();
            }
          },
    resetSS: function(){
            $this = $(this);
            $this.next().remove();
            //unbind all events and redraw
            $this.unbind().sSelect();
          }
  });

  $.fn.sSelect = function(options) {
  
    return this.each(function(){
      
      var defaults = {
        defaultText: 'Please select',
        animationSpeed: 0, //set speed of dropdown
        ddMaxHeight: '' //set css max-height value of dropdown
      };

      //initial variables
      var opts = $.extend(defaults, options),
        $input = $(this),
        $containerDivText = $('<div class="selectedTxt"></div>'),
        $containerDiv = $('<div class="newListSelected" tabindex="0"></div>'),
        $newUl = $('<ul class="newList"></ul>'),
        itemIndex = -1,
        currentIndex = -1,
        keys = [],
        prevKey = false,
        newListItems = '',
        prevented = false;
        
      //build new list
      $containerDiv.insertAfter($input);
      $containerDivText.prependTo($containerDiv);
      $newUl.appendTo($containerDiv);
      $input.hide();
    
      //test for optgroup
      if ($input.children('optgroup').length == 0){
        $input.children().each(function(i){
          var option = $(this).text();
          //add first letter of each word to array
          keys.push(option.charAt(0).toLowerCase());
          if ($(this).attr('selected') == true){
            opts.defaultText = option;
            currentIndex = i;
          }
          newListItems += '<li>'+option+'</li>';
        });
        //add new list items to ul
        $newUl.html(newListItems);
        newListItems = '';
        //cache list items object
        var $newLi = $newUl.children();
                
      } else { //optgroup
        $input.children('optgroup').each(function(i){
        
          var optionTitle = $(this).attr('label'),
            $optGroup = $('<li class="newListOptionTitle">'+optionTitle+'</li>');
            
          $optGroup.appendTo($newUl);

          var $optGroupList = $('<ul></ul>');

          $optGroupList.appendTo($optGroup);

          $(this).children().each(function(){
            ++itemIndex;
            var option = $(this).text();
            //add first letter of each word to array
            keys.push(option.charAt(0).toLowerCase());
            if ($(this).attr('selected') == true){
              opts.defaultText = option;
              currentIndex = itemIndex;
            }
            newListItems += '<li>'+option+'</li>';
          })
          //add new list items to ul
          $optGroupList.html(newListItems);
          newListItems = '';
        });
        //cache list items object
        var $newLi = $newUl.find('ul li');
      
      }
      
      //get heights of new elements for use later
      var newUlHeight = $newUl.height()+3,
        containerHeight = $containerDiv.height()+3,
        newLiLength = $newLi.length;
    
      //check if a value is selected
      if (currentIndex != -1){
        navigateList(currentIndex, true);
      } else {
        //set placeholder text
        $containerDivText.text(opts.defaultText);
      }

      //decide if to place the new list above or below the drop-down
      function newUlPos(){
        var containerPosY = $containerDiv.offset().top,
          docHeight = jQuery(window).height(),
          scrollTop = jQuery(window).scrollTop();

          //if height of list is greater then max height, set list height to max height value
          if (newUlHeight > parseInt(opts.ddMaxHeight)) {
            newUlHeight = parseInt(opts.ddMaxHeight);
          }  

        containerPosY = containerPosY-scrollTop;
        if (containerPosY+newUlHeight >= docHeight){
          $newUl.css({top: '-'+newUlHeight+'px', height: newUlHeight});
          $input.onTop = true;
        } else {
          $newUl.css({top: containerHeight+'px', height: newUlHeight});
          $input.onTop = false;
        }
      }

      //run function on page load
      newUlPos();
      
      //run function on browser window resize
      $(window).resize(function(){
        newUlPos();
      });
      
      $(window).scroll(function(){
        newUlPos();
      });

      //positioning
      function positionFix(){
        $containerDiv.css('position','relative');
      }

      function positionHideFix(){
        $containerDiv.css('position','static');
      }
      
      $containerDivText.click(function(){
      
        if ($newUl.is(':visible')){
          $newUl.hide();
          positionHideFix()
          return false;
        }

        $containerDiv.focus();

        //show list
        $newUl.slideDown(opts.animationSpeed);
        positionFix();
        //scroll list to selected item
        $newUl.scrollTop($input.liOffsetTop);

      });
      
      $newLi.hover(
        function (e) {
        var $hoveredLi = $(e.target);
        $hoveredLi.addClass('newListHover');
        },
        function (e) {
        var $hoveredLi = $(e.target);
        $hoveredLi.removeClass('newListHover');
        }
      );

      $newLi.click(function(e){
        var $clickedLi = $(e.target);
        //update counter
        currentIndex = $newLi.index($clickedLi);
        //remove all hilites, then add hilite to selected item
        prevented = true;
        navigateList(currentIndex);
        $newUl.hide();
        $containerDiv.css('position','static');//ie
      });

      function navigateList(currentIndex, init){

        //get offsets
        var containerOffsetTop = $containerDiv.offset().top,
          liOffsetTop = $newLi.eq(currentIndex).offset().top,
          ulScrollTop = $newUl.scrollTop();
        
        //get distance of current li from top of list        
        if ($input.onTop == true){
          //if list is above select box, add max height value
          $input.liOffsetTop = (((liOffsetTop-containerOffsetTop)-containerHeight)+ulScrollTop)+parseInt(opts.ddMaxHeight);
        } else {
          $input.liOffsetTop = ((liOffsetTop-containerOffsetTop)-containerHeight)+ulScrollTop;
        }
        
        //scroll list to focus on current item
        $newUl.scrollTop($input.liOffsetTop);
        
        $newLi.removeClass('hiLite')
          .eq(currentIndex)
          .addClass('hiLite');
        var text = $newLi.eq(currentIndex).text();
        //page load
        if (init == true){
          $input.val(text);
          $containerDivText.text(text);
          return false;
        }
        $input.val(text).change();
        $containerDivText.text(text);

      };

      $input.change(function(event){
          $targetInput = $(event.target);
          //stop change function from firing 
          if (prevented == true){
            prevented = false;
            return false;
          }
          $currentOpt = $targetInput.find(':selected');
          currentIndex = $targetInput.find('option').index($currentOpt);
          navigateList(currentIndex, true);
        }
      );
      
      //handle up and down keys
      function keyPress(element) {
        //when keys are pressed
        element.onkeydown = function(e){
          if (e == null) { //ie
            var keycode = event.keyCode;
          } else { //everything else
            var keycode = e.which;
          }
          
          //prevent change function from firing
          prevented = true;

          switch(keycode)
          {
          case 40: //down
          case 39: //right
            incrementList();
            return false;
            break;
          case 38: //up
          case 37: //left
            decrementList();
            return false;
            break;
          case 33: //page up
          case 36: //home
            gotoFirst();
            return false;
            break;
          case 34: //page down
          case 35: //end
            gotoLast();
            return false;
            break;
          case 13:
          case 27:
            $newUl.hide();
            positionHideFix();
            return false;
            break;
          }

          //check for keyboard shortcuts
          keyPressed = String.fromCharCode(keycode).toLowerCase();
          var currentKeyIndex = keys.indexOf(keyPressed);
          if (typeof currentKeyIndex != 'undefined') { //if key code found in array
            ++currentIndex;
            currentIndex = keys.indexOf(keyPressed, currentIndex); //search array from current index
            if (currentIndex == -1 || currentIndex == null || prevKey != keyPressed) currentIndex = keys.indexOf(keyPressed); //if no entry was found or new key pressed search from start of array
            navigateList(currentIndex);
            //store last key pressed
            prevKey = keyPressed;
            return false;
          }
        }
      }

      function incrementList(){
        if (currentIndex < (newLiLength-1)) {
          ++currentIndex;
          navigateList(currentIndex);
        }
      }

      function decrementList(){
        if (currentIndex > 0) {
          --currentIndex;
          navigateList(currentIndex);
        }
      }

      function gotoFirst(){
        currentIndex = 0;
        navigateList(currentIndex);
      }
      
      function gotoLast(){
        currentIndex = newLiLength-1;
        navigateList(currentIndex);
      }

      $containerDiv.click(function(){
        keyPress(this);
      });

      $containerDiv.focus(function(){
        $(this).addClass('newListSelFocus');
        keyPress(this);
      });
      
      //hide list on blur
      $containerDiv.blur(function(){
         $(this).removeClass('newListSelFocus');
         $newUl.hide();
         positionHideFix();
      });

      //add classes on hover
      $containerDivText.hover(function(e) {
        var $hoveredTxt = $(e.target);
        $hoveredTxt.parent().addClass('newListSelHover');
        }, 
        function(e) {
        var $hoveredTxt = $(e.target);
        $hoveredTxt.parent().removeClass('newListSelHover');
        }
      );

      //reset left property and hide
      $newUl.css('left','0').hide();
      
    });
    
  };

})(jQuery);