/**
 * jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget.
 * @requires jQuery v1.2 or above
 *
 * http://gmarwaha.com/jquery/jcarousellite/
 *
 * Copyright (c) 2007 Ganeshji Marwaha (gmarwaha.com)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Version: 1.0.1
 * Note: Requires jquery 1.2 or above from version 1.0.1
 */

/**
 * Creates a carousel-style navigation widget for images/any-content from a simple HTML markup.
 *
 * The HTML markup that is used to build the carousel can be as simple as...
 *
 *  <div class="carousel">
 *      <ul>
 *          <li><img src="image/1.jpg" alt="1"></li>
 *          <li><img src="image/2.jpg" alt="2"></li>
 *          <li><img src="image/3.jpg" alt="3"></li>
 *      </ul>
 *  </div>
 *
 * As you can see, this snippet is nothing but a simple div containing an unordered list of images.
 * You don't need any special "class" attribute, or a special "css" file for this plugin.
 * I am using a class attribute just for the sake of explanation here.
 *
 * To navigate the elements of the carousel, you need some kind of navigation buttons.
 * For example, you will need a "previous" button to go backward, and a "next" button to go forward.
 * This need not be part of the carousel "div" itself. It can be any element in your page.
 * Lets assume that the following elements in your document can be used as next, and prev buttons...
 *
 * <button class="prev">&lt;&lt;</button>
 * <button class="next">&gt;&gt;</button>
 *
 * Now, all you need to do is call the carousel component on the div element that represents it, and pass in the
 * navigation buttons as options.
 *
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev"
 * });
 *
 * That's it, you would have now converted your raw div, into a magnificient carousel.
 *
 * There are quite a few other options that you can use to customize it though.
 * Each will be explained with an example below.
 *
 * @param an options object - You can specify all the options shown below as an options object param.
 *
 * @option btnPrev, btnNext : string - no defaults
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev"
 * });
 * @desc Creates a basic carousel. Clicking "btnPrev" navigates backwards and "btnNext" navigates forward.
 *
 * @option btnGo - array - no defaults
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      btnGo: [".0", ".1", ".2"]
 * });
 * @desc If you don't want next and previous buttons for navigation, instead you prefer custom navigation based on
 * the item number within the carousel, you can use this option. Just supply an array of selectors for each element
 * in the carousel. The index of the array represents the index of the element. What i mean is, if the
 * first element in the array is ".0", it means that when the element represented by ".0" is clicked, the carousel
 * will slide to the first element and so on and so forth. This feature is very powerful. For example, i made a tabbed
 * interface out of it by making my navigation elements styled like tabs in css. As the carousel is capable of holding
 * any content, not just images, you can have a very simple tabbed navigation in minutes without using any other plugin.
 * The best part is that, the tab will "slide" based on the provided effect. :-)
 *
 * @option mouseWheel : boolean - default is false
 * @example
 * $(".carousel").jCarouselLite({
 *      mouseWheel: true
 * });
 * @desc The carousel can also be navigated using the mouse wheel interface of a scroll mouse instead of using buttons.
 * To get this feature working, you have to do 2 things. First, you have to include the mouse-wheel plugin from brandon.
 * Second, you will have to set the option "mouseWheel" to true. That's it, now you will be able to navigate your carousel
 * using the mouse wheel. Using buttons and mouseWheel or not mutually exclusive. You can still have buttons for navigation
 * as well. They complement each other. To use both together, just supply the options required for both as shown below.
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      mouseWheel: true
 * });
 *
 * @option auto : number - default is null, meaning autoscroll is disabled by default
 * @example
 * $(".carousel").jCarouselLite({
 *      auto: 800,
 *      speed: 500
 * });
 * @desc You can make your carousel auto-navigate itself by specfying a millisecond value in this option.
 * The value you specify is the amount of time between 2 slides. The default is null, and that disables auto scrolling.
 * Specify this value and magically your carousel will start auto scrolling.
 *
 * @option speed : number - 200 is default
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      speed: 800
 * });
 * @desc Specifying a speed will slow-down or speed-up the sliding speed of your carousel. Try it out with
 * different speeds like 800, 600, 1500 etc. Providing 0, will remove the slide effect.
 *
 * @option easing : string - no easing effects by default.
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      easing: "bounceout"
 * });
 * @desc You can specify any easing effect. Note: You need easing plugin for that. Once specified,
 * the carousel will slide based on the provided easing effect.
 *
 * @option vertical : boolean - default is false
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      vertical: true
 * });
 * @desc Determines the direction of the carousel. true, means the carousel will display vertically. The next and
 * prev buttons will slide the items vertically as well. The default is false, which means that the carousel will
 * display horizontally. The next and prev items will slide the items from left-right in this case.
 *
 * @option circular : boolean - default is true
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      circular: false
 * });
 * @desc Setting it to true enables circular navigation. This means, if you click "next" after you reach the last
 * element, you will automatically slide to the first element and vice versa. If you set circular to false, then
 * if you click on the "next" button after you reach the last element, you will stay in the last element itself
 * and similarly for "previous" button and first element.
 *
 * @option visible : number - default is 3
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      visible: 4
 * });
 * @desc This specifies the number of items visible at all times within the carousel. The default is 3.
 * You are even free to experiment with real numbers. Eg: "3.5" will have 3 items fully visible and the
 * last item half visible. This gives you the effect of showing the user that there are more images to the right.
 *
 * @option start : number - default is 0
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      start: 2
 * });
 * @desc You can specify from which item the carousel should start. Remember, the first item in the carousel
 * has a start of 0, and so on.
 *
 * @option scrool : number - default is 1
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      scroll: 2
 * });
 * @desc The number of items that should scroll/slide when you click the next/prev navigation buttons. By
 * default, only one item is scrolled, but you may set it to any number. Eg: setting it to "2" will scroll
 * 2 items when you click the next or previous buttons.
 *
 * @option beforeStart, afterEnd : function - callbacks
 * @example
 * $(".carousel").jCarouselLite({
 *      btnNext: ".next",
 *      btnPrev: ".prev",
 *      beforeStart: function(a) {
 *          alert("Before animation starts:" + a);
 *      },
 *      afterEnd: function(a) {
 *          alert("After animation ends:" + a);
 *      }
 * });
 * @desc If you wanted to do some logic in your page before the slide starts and after the slide ends, you can
 * register these 2 callbacks. The functions will be passed an argument that represents an array of elements that
 * are visible at the time of callback.
 *
 *
 * @cat Plugins/Image Gallery
 * @author Ganeshji Marwaha/ganeshread@gmail.com
 */

(function($) {                                          // Compliant with jquery.noConflict()
$.fn.jCarouselLite = function(o) {
    o = $.extend({
        btnPrev: null,
        btnNext: null,
        btnGo: null,
        mouseWheel: false,
        auto: null,

        speed: 200,
        easing: null,

        vertical: false,
        circular: true,
        visible: 3,
        start: 0,
        scroll: 1,

        beforeStart: null,
        afterEnd: null
    }, o || {});

    return this.each(function() {                           // Returns the element collection. Chainable.

        var running = false, animCss=o.vertical?"top":"left", sizeCss=o.vertical?"height":"width";
        var div = $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible;
	
		var totalHeight=0;

		var oldcurr;
	
	
		
		
		
		
		
		//totalWidth = $('li:eq(4)', ul).offset().top - $(div).offset().top;
		//totalHeight += 35;
		

        var li = $("li", ul), itemLength = li.size(), curr = o.start;
        div.css("visibility", "visible");
		

        li.css({overflow: "hidden", float: o.vertical ? "none" : "left", "padding" : "0px", "margin": "0px"});
        ul.css({margin: "0", padding: "0", position: "relative", "list-style-type": "none", "z-index": "1", "top":0});
        div.css({overflow: "hidden", position: "relative", "z-index": "2", left: "0px", "display" : "block"});

        var liSize = o.vertical ? height(li) : width(li);   // Full li size(incl margin)-Used for animation
        var ulSize = liSize * itemLength;                   // size of full ul(total length, not just for the visible items)

       ulSize = $('li:eq('+(itemLength-1)+')', ul).offset().top;


        //var divSize = liSize * v;                           // size of entire div(total length for just the visible items)
        var divSize;

               var curr = 0;
		
		var w = 0;
		var lww = 0;
		i = 0;
			
			
			
			
		divSize = 450 ;
			
		
		//while( i < tl-4 )
		while( $('li:eq('+(i+3)+')', ul).length )
		{
			totalHeight = 0;
			for( j=0; j<4; j++ )
			{
				totalHeight += height( $('li:eq('+(i+j)+')', ul) );
                                $('li:eq('+(i+j)+')', ul).css('height', height($('li:eq('+(i+j)+')', ul)) );
				
			}
			
			
			//alert(divSize-Math.ceil((totalHeight-height( $('li:eq('+(i+3)+')', ul) ))/3));
			if( (totalHeight + 10  >= divSize )  )
			{
				
				
				totalHeight -= height( $('li:eq('+(i+3)+')', ul) );
				
				lw = Math.ceil( ((divSize - totalHeight)/2) );
				$('li:eq('+(i)+')', ul).after( '<li><div id="line"></div></li>' );
				$('li:eq('+(i+1)+')', ul).css( 'height', lw );
				
				
				$('li:eq('+(i+2)+')', ul).after( '<li><div id="line"></div></li>' );
				$('li:eq('+(i+3)+')', ul).css( 'height', lw );	

                                itemLength += 2;


                                var delta=0;
                                for( a=0;a<=4;a++)
                                    delta += height( $('li:eq('+(i+a)+')', ul) );

                                   

                                delta = (divSize) - (delta );

                               //alert(delta);



                                $('li:eq('+(i+3)+')', ul).css( 'height', parseInt(height($('li:eq('+(i+3)+')', ul))+delta)+'px' );

                                
				
				i+=5;
				
			}else

			{



				lw = Math.ceil( ((divSize - totalHeight)/3) );

				$('li:eq('+(i)+')', ul).after( '<li><div id="line"></div></li>' );
				$('li:eq('+(i+1)+')', ul).css( 'height', lw );
				
				
				$('li:eq('+(i+2)+')', ul).after( '<li><div id="line"></div></li>' );
				$('li:eq('+(i+3)+')', ul).css( 'height', lw );	
				
				
				$('li:eq('+(i+4)+')', ul).after( '<li><div id="line"></div></li>' );
				$('li:eq('+(i+5)+')', ul).css( 'height', lw );	

                                itemLength += 3;

                                var delta=0;
                                for( a=0;a<=6;a++)
                                    delta += height( $('li:eq('+(i+a)+')', ul) );

                                   
                                delta = (divSize) - (delta);

                                 // alert( delta);
                              

                                $('li:eq('+(i+5)+')', ul).css( 'height', parseInt(height($('li:eq('+(i+5)+')', ul))+delta)+'px' );

                                /*var delta=0;
                                for( a=0;a<=6;a++)
                                    delta += height( $('li:eq('+(i+a)+')', ul) );
                                alert(delta);
                                */

				i += 7;
			}
			
			
		}

                j = i;
               
                while( itemLength>j ) {
                    
                    $('li:eq('+(j)+')', ul).after( '<li><div id="line"></div></li>' );
                    $('li:eq('+(j+1)+')', ul).css('height','2px');
                    itemLength++;
                    j+=2;
                }

                   ulSize = $('li:eq('+(itemLength-1)+')', ul).offset().top;

		
		
			
		totalHeight = 0;
		
		
	
		
		

		
        //li.css({width: li.width(), height: li.height()});
		
		
		
		
       	//ul.css(sizeCss, ulSize+"px").css(animCss, -(0));
		//ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));

        div.css(sizeCss, divSize+"px");                     // Width of the DIV. length of visible images

		
		


        if(o.btnPrev)
            $(o.btnPrev).click(function() {
                return go(curr-o.scroll);
            });

        if(o.btnNext)
            $(o.btnNext).click(function() {
                return go(curr+o.scroll);
            });

        if(o.btnGo)
            $.each(o.btnGo, function(i, val) {
                $(val).click(function() {
                    return go(o.circular ? o.visible+i : i);
                });
            });

        if(o.mouseWheel && div.mousewheel)
            div.mousewheel(function(e, d) {
                return d>0 ? go(curr-o.scroll) : go(curr+o.scroll);
            });

        if(o.auto)
            setInterval(function() {
                go(curr+o.scroll);
            }, o.auto+o.speed);

        function vis() {
            return li.slice(curr).slice(0,v);
        };

        function go(to) {
            
           
           
           

            if(!running) {

                oldcurr = curr;
                curr=to;

                if( oldcurr > curr )
                {
                    if( totalHeight + divSize > 0 ) return;
                    totalHeight += divSize;
                }
                else
                {
                    
                    //alert( parseInt(ulSize+totalHeight-divSize) + ' - ' + divSize);
                    if( ulSize + totalHeight-div.offset().top < divSize ) return;
                    totalHeight -= divSize;
                }


                if(o.beforeStart)
                    o.beforeStart.call(this, vis());

                running = true;
				
				
				
		//alert( oldcurr + ' - ' + curr)		;
				
                
				
				
		
                ul.animate(
                    animCss == "left" ? { left: -(curr*liSize) } : { top: (totalHeight) } , o.speed, o.easing,
                    function() {
                        if(o.afterEnd)
                            o.afterEnd.call(this, vis());
                        running = false;
                    }
                );
                

              
                if(!o.circular) {
                   
                    //$(o.btnPrev + "," + o.btnNext).removeClass("disabled");
                    $(o.btnPrev + "," + o.btnNext).css( 'background-color', '#D7B2D7' );
                    //$( (curr-o.scroll<0 && o.btnPrev) || (curr+o.scroll > itemLength-v && o.btnNext) || [] ).addClass("disabled");
                    //$( (curr-o.scroll<0 && o.btnPrev) || (curr+o.scroll > itemLength-v && o.btnNext) || [] ).css( 'background-color', '#cccccc' );
                    $( (totalHeight==0 && o.btnPrev) || (ulSize+totalHeight-div.offset().top<divSize && o.btnNext) || [] ).css( 'background-color', '#cccccc' );
					
                }

            }
            return false;
        };
    });
};

function css(el, prop) {
    return parseInt($.css(el[0], prop)) || 0;
};
function width(el) {
	
    return  el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
};
function height(el) {
    return el[0].offsetHeight;// + css(el, 'marginTop') + css(el, 'marginBottom');
};

})(jQuery);