/*
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 inputWidth = $(this).width();
            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();

            $containerDivText.width(inputWidth);
            $containerDiv.css({ width: $containerDivText.outerWidth() + 'px' }).addClass($input.attr("class"));
            $newUl.css({ width: $containerDiv.outerWidth() + 'px' });
            
            //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);