(function($) {

$.jScrollPane = {
	active : []
};
$.fn.jScrollPane = function(settings)
{
	settings = $.extend({}, $.fn.jScrollPane.defaults, settings);

	var rf = function() { return false; };
	
	return this.each(
		function()
		{
			var $this = $(this);
			var paneEle = this;
			var currentScrollPosition = 0;
			var paneWidth;
			var paneHeight;
			var trackHeight;
			var trackOffset = settings.topCapHeight;
			
			if ($(this).parent().is('.jScrollPaneContainer')) {
				currentScrollPosition = settings.maintainPosition ? $this.position().top : 0;
				var $c = $(this).parent();
				paneWidth = $c.innerWidth();
				paneHeight = $c.outerHeight();
				$('>.jScrollPaneTrack, >.jScrollArrowUp, >.jScrollArrowDown, >.jScrollCap', $c).remove();
				$this.css({'top':0});
			} else {
				$this.data('originalStyleTag', $this.attr('style'));
				$this.css('overflow', 'hidden');
				this.originalPadding = $this.css('paddingTop') + ' ' + $this.css('paddingRight') + ' ' + $this.css('paddingBottom') + ' ' + $this.css('paddingLeft');
				this.originalSidePaddingTotal = (parseInt($this.css('paddingLeft')) || 0) + (parseInt($this.css('paddingRight')) || 0);
				paneWidth = $this.innerWidth();
				paneHeight = $this.innerHeight();
				var $container = $('<div></div>')
					.attr({'className':'jScrollPaneContainer'})
					.css(
						{
							'height':paneHeight+'px', 
							'width':paneWidth+'px'
						}
					);
				if (settings.enableKeyboardNavigation) {
					$container.attr(
						'tabindex', 
						settings.tabIndex
					);
				}
				$this.wrap($container);
				$(document).bind(
					'emchange', 
					function(e, cur, prev)
					{
						$this.jScrollPane(settings);
					}
				);
				
			}
			trackHeight = paneHeight;
			
			if (settings.reinitialiseOnImageLoad) {
				var $imagesToLoad = $.data(paneEle, 'jScrollPaneImagesToLoad') || $('img', $this);
				var loadedImages = [];
				
				if ($imagesToLoad.length) {
					$imagesToLoad.each(function(i, val)	{
						$(this).bind('load readystatechange', function() {
							if($.inArray(i, loadedImages) == -1){ 
								loadedImages.push(val); 
								$imagesToLoad = $.grep($imagesToLoad, function(n, i) {
									return n != val;
								});
								$.data(paneEle, 'jScrollPaneImagesToLoad', $imagesToLoad);
								var s2 = $.extend(settings, {reinitialiseOnImageLoad:false});
								$this.jScrollPane(s2);
							}
						}).each(function(i, val) {
							if(this.complete || this.complete===undefined) { 
								this.src = this.src; 
							} 
						});
					});
				};
			}

			var p = this.originalSidePaddingTotal;
			var realPaneWidth = paneWidth - settings.scrollbarWidth - settings.scrollbarMargin - p;

			var cssToApply = {
				'height':'auto',
				'width': realPaneWidth + 'px'
			}

			if(settings.scrollbarOnLeft) {
				cssToApply.paddingLeft = settings.scrollbarMargin + settings.scrollbarWidth + 'px';
			} else {
				cssToApply.paddingRight = settings.scrollbarMargin + 'px';
			}

			$this.css(cssToApply);

			var contentHeight = $this.outerHeight();
			var percentInView = paneHeight / contentHeight;

			if (percentInView < .99) {
				var $container = $this.parent();
				$container.append(
					$('<div></div>').addClass('jScrollCap jScrollCapTop').css({height:settings.topCapHeight}),
					$('<div></div>').attr({'className':'jScrollPaneTrack'}).css({'width':settings.scrollbarWidth+'px'}).append(
						$('<div></div>').attr({'className':'jScrollPaneDrag'}).css({'width':settings.scrollbarWidth+'px'}).append(
							$('<div></div>').attr({'className':'jScrollPaneDragTop'}).css({'width':settings.scrollbarWidth+'px'}),
							$('<div></div>').attr({'className':'jScrollPaneDragBottom'}).css({'width':settings.scrollbarWidth+'px'})
						)
					),
					$('<div></div>').addClass('jScrollCap jScrollCapBottom').css({height:settings.bottomCapHeight})
				);
				
				var $track = $('>.jScrollPaneTrack', $container);
				var $drag = $('>.jScrollPaneTrack .jScrollPaneDrag', $container);
				
				
				var currentArrowDirection;
				var currentArrowTimerArr = [];
				var currentArrowInc;
				var whileArrowButtonDown = function() 
				{
					if (currentArrowInc > 4 || currentArrowInc % 4 == 0) {
						positionDrag(dragPosition + currentArrowDirection * mouseWheelMultiplier);
					}
					currentArrowInc++;
				};

				if (settings.enableKeyboardNavigation) {
					$container.bind(
						'keydown.jscrollpane',
						function(e) 
						{
							switch (e.keyCode) {
								case 38: //up
									currentArrowDirection = -1;
									currentArrowInc = 0;
									whileArrowButtonDown();
									currentArrowTimerArr[currentArrowTimerArr.length] = setInterval(whileArrowButtonDown, 100);
									return false;
								case 40: //down
									currentArrowDirection = 1;
									currentArrowInc = 0;
									whileArrowButtonDown();
									currentArrowTimerArr[currentArrowTimerArr.length] = setInterval(whileArrowButtonDown, 100);
									return false;
								case 33: // page up
								case 34: // page down
									return false;
								default:
							}
						}
					).bind(
						'keyup.jscrollpane',
						function(e) 
						{
							if (e.keyCode == 38 || e.keyCode == 40) {
								for (var i = 0; i < currentArrowTimerArr.length; i++) {
									clearInterval(currentArrowTimerArr[i]);
								}
								return false;
							}
						}
					);
				}

				if (settings.showArrows) {
					
					var currentArrowButton;
					var currentArrowInterval;

					var onArrowMouseUp = function(event)
					{
						$('html').unbind('mouseup', onArrowMouseUp);
						currentArrowButton.removeClass('jScrollActiveArrowButton');
						clearInterval(currentArrowInterval);
					};
					var onArrowMouseDown = function() {
						$('html').bind('mouseup', onArrowMouseUp);
						currentArrowButton.addClass('jScrollActiveArrowButton');
						currentArrowInc = 0;
						whileArrowButtonDown();
						currentArrowInterval = setInterval(whileArrowButtonDown, 100);
					};
					$container
						.append(
							$('<a></a>')
								.attr(
									{
										'href':'javascript:;', 
										'className':'jScrollArrowUp', 
										'tabindex':-1
									}
								)
								.css(
									{
										'width':settings.scrollbarWidth+'px',
										'top':settings.topCapHeight + 'px'
									}
								)
								.html('Scroll up')
								.bind('mousedown', function()
								{
									currentArrowButton = $(this);
									currentArrowDirection = -1;
									onArrowMouseDown();
									this.blur();
									return false;
								})
								.bind('click', rf),
							$('<a></a>')
								.attr(
									{
										'href':'javascript:;', 
										'className':'jScrollArrowDown', 
										'tabindex':-1
									}
								)
								.css(
									{
										'width':settings.scrollbarWidth+'px',
										'bottom':settings.bottomCapHeight + 'px'
									}
								)
								.html('Scroll down')
								.bind('mousedown', function()
								{
									currentArrowButton = $(this);
									currentArrowDirection = 1;
									onArrowMouseDown();
									this.blur();
									return false;
								})
								.bind('click', rf)
						);
					var $upArrow = $('>.jScrollArrowUp', $container);
					var $downArrow = $('>.jScrollArrowDown', $container);
				}
				
				if (settings.arrowSize) {
					trackHeight = paneHeight - settings.arrowSize - settings.arrowSize;
					trackOffset += settings.arrowSize;
				} else if ($upArrow) {
					var topArrowHeight = $upArrow.height();
					settings.arrowSize = topArrowHeight;
					trackHeight = paneHeight - topArrowHeight - $downArrow.height();
					trackOffset += topArrowHeight;
				}
				trackHeight -= settings.topCapHeight + settings.bottomCapHeight;
				$track.css({'height': trackHeight+'px', top:trackOffset+'px'})
				
				var $pane = $(this).css({'position':'absolute', 'overflow':'visible'});
				
				var currentOffset;
				var maxY;
				var mouseWheelMultiplier;
				var dragPosition = 0;
				var dragMiddle = percentInView*paneHeight/2;
				
				var getPos = function (event, c) {
					var p = c == 'X' ? 'Left' : 'Top';
					return event['page' + c] || (event['client' + c] + (document.documentElement['scroll' + p] || document.body['scroll' + p])) || 0;
				};
				
				var ignoreNativeDrag = function() {	return false; };
				
				var initDrag = function()
				{
					ceaseAnimation();
					currentOffset = $drag.offset(false);
					currentOffset.top -= dragPosition;
					maxY = trackHeight - $drag[0].offsetHeight;
					mouseWheelMultiplier = 2 * settings.wheelSpeed * maxY / contentHeight;
				};
				
				var onStartDrag = function(event)
				{
					initDrag();
					dragMiddle = getPos(event, 'Y') - dragPosition - currentOffset.top;
					$('html').bind('mouseup', onStopDrag).bind('mousemove', updateScroll);
					if ($.browser.msie) {
						$('html').bind('dragstart', ignoreNativeDrag).bind('selectstart', ignoreNativeDrag);
					}
					return false;
				};
				var onStopDrag = function()
				{
					$('html').unbind('mouseup', onStopDrag).unbind('mousemove', updateScroll);
					dragMiddle = percentInView*paneHeight/2;
					if ($.browser.msie) {
						$('html').unbind('dragstart', ignoreNativeDrag).unbind('selectstart', ignoreNativeDrag);
					}
				};
				var positionDrag = function(destY)
				{
					$container.scrollTop(0);
					destY = destY < 0 ? 0 : (destY > maxY ? maxY : destY);
					dragPosition = destY;
					$drag.css({'top':destY+'px'});
					var p = destY / maxY;
					$this.data('jScrollPanePosition', (paneHeight-contentHeight)*-p);
					$pane.css({'top':((paneHeight-contentHeight)*p) + 'px'});
					$this.trigger('scroll');
					if (settings.showArrows) {
						$upArrow[destY == 0 ? 'addClass' : 'removeClass']('disabled');
						$downArrow[destY == maxY ? 'addClass' : 'removeClass']('disabled');
					}
				};
				var updateScroll = function(e)
				{
					positionDrag(getPos(e, 'Y') - currentOffset.top - dragMiddle);
				};
				
				var dragH = Math.max(Math.min(percentInView*(paneHeight-settings.arrowSize*2), settings.dragMaxHeight), settings.dragMinHeight);
				
				$drag.css(
					{'height':dragH+'px'}
				).bind('mousedown', onStartDrag);
				
				var trackScrollInterval;
				var trackScrollInc;
				var trackScrollMousePos;
				var doTrackScroll = function()
				{
					if (trackScrollInc > 8 || trackScrollInc%4==0) {
						positionDrag((dragPosition - ((dragPosition - trackScrollMousePos) / 2)));
					}
					trackScrollInc ++;
				};
				var onStopTrackClick = function()
				{
					clearInterval(trackScrollInterval);
					$('html').unbind('mouseup', onStopTrackClick).unbind('mousemove', onTrackMouseMove);
				};
				var onTrackMouseMove = function(event)
				{
					trackScrollMousePos = getPos(event, 'Y') - currentOffset.top - dragMiddle;
				};
				var onTrackClick = function(event)
				{
					initDrag();
					onTrackMouseMove(event);
					trackScrollInc = 0;
					$('html').bind('mouseup', onStopTrackClick).bind('mousemove', onTrackMouseMove);
					trackScrollInterval = setInterval(doTrackScroll, 100);
					doTrackScroll();
					return false;
				};
				
				$track.bind('mousedown', onTrackClick);
				
				$container.bind(
					'mousewheel',
					function (event, delta) {
						delta = delta || (event.wheelDelta ? event.wheelDelta / 120 : (event.detail) ?
-event.detail/3 : 0);
						initDrag();
						ceaseAnimation();
						var d = dragPosition;
						positionDrag(dragPosition - delta * mouseWheelMultiplier);
						var dragOccured = d != dragPosition;
						return !dragOccured;
					}
				);

				var _animateToPosition;
				var _animateToInterval;
				function animateToPosition()
				{
					var diff = (_animateToPosition - dragPosition) / settings.animateStep;
					if (diff > 1 || diff < -1) {
						positionDrag(dragPosition + diff);
					} else {
						positionDrag(_animateToPosition);
						ceaseAnimation();
					}
				}
				var ceaseAnimation = function()
				{
					if (_animateToInterval) {
						clearInterval(_animateToInterval);
						delete _animateToPosition;
					}
				};
				var scrollTo = function(pos, preventAni)
				{
					if (typeof pos == "string") {
						$e = $(pos, $this);
						if (!$e.length) return;
						pos = $e.offset().top - $this.offset().top;
					}
					ceaseAnimation();
					var maxScroll = contentHeight - paneHeight;
					pos = pos > maxScroll ? maxScroll : pos;
					$this.data('jScrollPaneMaxScroll', maxScroll);
					var destDragPosition = pos/maxScroll * maxY;
					if (preventAni || !settings.animateTo) {
						positionDrag(destDragPosition);
					} else {
						$container.scrollTop(0);
						_animateToPosition = destDragPosition;
						_animateToInterval = setInterval(animateToPosition, settings.animateInterval);
					}
				};
				$this[0].scrollTo = scrollTo;
				
				$this[0].scrollBy = function(delta)
				{
					var currentPos = -parseInt($pane.css('top')) || 0;
					scrollTo(currentPos + delta);
				};
				
				initDrag();
				
				scrollTo(-currentScrollPosition, true);
			
				// Deal with it when the user tabs to a link or form element within this scrollpane
				$('*', this).bind(
					'focus',
					function(event)
					{
						var $e = $(this);
						
						// loop through parents adding the offset top of any elements that are relatively positioned between
						// the focused element and the jScrollPaneContainer so we can get the true distance from the top
						// of the focused element to the top of the scrollpane...
						var eleTop = 0;
						
						while ($e[0] != $this[0]) {
							eleTop += $e.position().top;
							$e = $e.offsetParent();
						}
						
						var viewportTop = -parseInt($pane.css('top')) || 0;
						var maxVisibleEleTop = viewportTop + paneHeight;
						var eleInView = eleTop > viewportTop && eleTop < maxVisibleEleTop;
						if (!eleInView) {
							var destPos = eleTop - settings.scrollbarMargin;
							if (eleTop > viewportTop) { // element is below viewport - scroll so it is at bottom.
								destPos += $(this).height() + 15 + settings.scrollbarMargin - paneHeight;
							}
							scrollTo(destPos);
						}
					}
				)
				
				
				if (location.hash && location.hash.length > 1) {
					setTimeout(function() {scrollTo(location.hash);}, $.browser.safari ? 100 : 0);
				}
				
				// use event delegation to listen for all clicks on links and hijack them if they are links to
				// anchors within our content...
				$(document).bind(
					'click',
					function(e)
					{
						$target = $(e.target);
						if ($target.is('a')) {
							var h = $target.attr('href');
							if (h && h.substr(0, 1) == '#' && h.length > 1) {
								setTimeout(function() {scrollTo(h, !settings.animateToInternalLinks);}, $.browser.safari ? 100 : 0);
							}
						}
					}
				); 
				
				// Deal with dragging and selecting text to make the scrollpane scroll...
				function onSelectScrollMouseDown(e)
				{
				   $(document).bind('mousemove.jScrollPaneDragging', onTextSelectionScrollMouseMove);
				   $(document).bind('mouseup.jScrollPaneDragging',   onSelectScrollMouseUp);
				  
				}
				
				var textDragDistanceAway;
				var textSelectionInterval;
				
				function onTextSelectionInterval()
				{
					direction = textDragDistanceAway < 0 ? -1 : 1;
					$this[0].scrollBy(textDragDistanceAway / 2);
				}

				function clearTextSelectionInterval()
				{
					if (textSelectionInterval) {
						clearInterval(textSelectionInterval);
						textSelectionInterval = undefined;
					}
				}
				
				function onTextSelectionScrollMouseMove(e)
				{
					var offset = $this.parent().offset().top;
					var maxOffset = offset + paneHeight;
					var mouseOffset = getPos(e, 'Y');
					textDragDistanceAway = mouseOffset < offset ? mouseOffset - offset : (mouseOffset > maxOffset ? mouseOffset - maxOffset : 0);
					if (textDragDistanceAway == 0) {
						clearTextSelectionInterval();
					} else {
						if (!textSelectionInterval) {
							textSelectionInterval  = setInterval(onTextSelectionInterval, 100);
						}
					}
				}

				function onSelectScrollMouseUp(e)
				{
				   $(document)
					  .unbind('mousemove.jScrollPaneDragging')
					  .unbind('mouseup.jScrollPaneDragging');
				   clearTextSelectionInterval();
				}

				$container.bind('mousedown.jScrollPane', onSelectScrollMouseDown);

				
				$.jScrollPane.active.push($this[0]);
				
			} else {
				$this.css(
					{
						'height':paneHeight+'px',
						'width':paneWidth-this.originalSidePaddingTotal+'px',
						'padding':this.originalPadding
					}
				);
				$this[0].scrollTo = $this[0].scrollBy = function() {};
				// clean up listeners
				$this.parent().unbind('mousewheel').unbind('mousedown.jScrollPane').unbind('keydown.jscrollpane').unbind('keyup.jscrollpane');
			}
			
		}
	)
};

$.fn.jScrollPaneRemove = function()
{
	$(this).each(function()
	{
		$this = $(this);
		var $c = $this.parent();
		if ($c.is('.jScrollPaneContainer')) {
			$this.css(
				{
					'top':'',
					'height':'',
					'width':'',
					'padding':'',
					'overflow':'',
					'position':''
				}
			);
			$this.attr('style', $this.data('originalStyleTag'));
			$c.after($this).remove();
		}
	});
}

$.fn.jScrollPane.defaults = {
	scrollbarWidth : 10,
	scrollbarMargin : 5,
	wheelSpeed : 18,
	showArrows : false,
	arrowSize : 0,
	animateTo : false,
	dragMinHeight : 1,
	dragMaxHeight : 9999,
	animateInterval : 100,
	animateStep: 3,
	maintainPosition: true,
	scrollbarOnLeft: false,
	reinitialiseOnImageLoad: false,
	tabIndex : 0,
	enableKeyboardNavigation: false,
	animateToInternalLinks: false,
	topCapHeight: 0,
	bottomCapHeight: 0
};

// clean up the scrollTo expandos
$(window)
	.bind('unload', function() {
		var els = $.jScrollPane.active; 
		for (var i=0; i<els.length; i++) {
			els[i].scrollTo = els[i].scrollBy = null;
		}
	}
);

})(jQuery);