/**
 * jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget.
 * @requires jQuery v1.3 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: 1.2.2 (Modified by OdiN)
 * Note: Requires jquery 1.3 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,*/
        mouseCheckSpeed: 20,
        
        linearSlideStep: 4,
        linearSlideTimeout: 200,
        linearSlideInterval: 5,
        
        linearThrottleStep: 15,
        linearThrottleTimeout: 2000,
        linearThrottleInterval: 5,

        slideOnceSpeed: null,
        slideOnceEasing: null,
        
        edgeElementSlide: null,
        //edgeElementSlideStep: 1,

        vertical: false,
        /*circular: true,*/
        visible: 5,
        start: 0,
        scroll: 1/*,

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

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

    	var btnOverFlag = false;
	    var btnHoldFlag = false;
	    var btnDownTime = 0;
	    var slideTimeoutCycle = null;
	    var pos = 0;

        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;

        /*if(o.circular) {
            ul.prepend(tLi.slice(tl-v-1+1).clone())
              .append(tLi.slice(0,v).clone());
            o.start += v;
        }*/

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

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

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

        li.css({width: li.width(), height: li.height()});
        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).mousedown(function() {
        		btnHoldFlag = true;
        		btnDownTime = new Date();
        		btnDownTime = btnDownTime.getTime();
        		startSlideTimeoutChecking('prev');
        		return btnHoldFlag;
            });
            $(o.btnPrev).mouseup(function() {
        		btnHoldFlag = false;
            	return btnHoldFlag;
            });
            $(o.btnPrev).mouseover(function() {
            	btnOverFlag = true;
            	return btnOverFlag;
            });
            $(o.btnPrev).mouseout(function() {
            	btnOverFlag = false;
            	return btnOverFlag;
            });
        };

        if(o.btnNext) {
        	$(o.btnNext).mousedown(function() {
        		btnHoldFlag = true;
        		btnDownTime = new Date();
        		btnDownTime = btnDownTime.getTime();
        		startSlideTimeoutChecking('next');
        		return btnHoldFlag;
            });
            $(o.btnNext).mouseup(function() {
        		btnHoldFlag = false;
            	return btnHoldFlag;
            });
            $(o.btnNext).mouseover(function() {
            	btnOverFlag = true;
            	return btnOverFlag;
            });
            $(o.btnNext).mouseout(function() {
            	btnOverFlag = false;
            	return btnOverFlag;
            });
        };
        
        if(o.edgeElementSlide) {
	        li.click(function() {
	        	var index = li.index(this);
	        	var visible_index = index-curr;
	        	if(visible_index == 0) {
	        		slideOnce(curr-1);
	        	} else if(visible_index == o.visible-1) {
	        		slideOnce(curr+1);
	        	}
	        });
        }

        /*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 startSlideTimeoutChecking(btn) {
        	slideTimeoutCycle = setInterval('window.checkSlideTimeout("'+btn+'")', o.mouseCheckSpeed);
        }

        window.checkSlideTimeout = function(btn) {
			var now = new Date();
			now = now.getTime();
			
    		if((now - btnDownTime > o.linearSlideTimeout) && btnHoldFlag && btnOverFlag) {
    			if(btn == 'next') {
    				clearInterval(slideTimeoutCycle);
    				window.slideLinear(o.linearSlideStep, btn);
	        	} else if(btn == 'prev') {
	        		clearInterval(slideTimeoutCycle);
	        		window.slideLinear(-o.linearSlideStep, btn);
	        	}  			
    		} else if(!btnHoldFlag) {
    			if(btn == 'next') {
    				clearInterval(slideTimeoutCycle);
    				slideOnce(curr+o.scroll);
	        	} else if(btn == 'prev') {
	        		clearInterval(slideTimeoutCycle);
	        		slideOnce(curr-o.scroll);
	        	}
	        }
        	return false;
        };
        
        window.slideLinear = function(px, btn) {	 
        	var now = new Date();
			now = now.getTime();
        	if((now - btnDownTime < o.linearThrottleTimeout)) {
				var pos_new = pos-px;
        	} else {
        		if(btn == 'next') {
					var pos_new = pos - o.linearThrottleStep;
        		} else if(btn == 'prev') {
        			var pos_new = pos + o.linearThrottleStep;
        		}
        	}
			
			if ((pos_new <= 0) && ((ulSize+pos_new) >= divSize)) {
	        	ul.css(animCss, pos_new);
	        	curr = Math.floor(-pos_new/liSize);
	        	if(!btnHoldFlag) {
					if(pos_new <= pos) {
						slideOnce(curr+1, 'linear');
					} else {
						slideOnce(curr, 'linear');
					}
	        	}
				pos = pos_new;
        	} else if (pos_new > 0) {
            	ul.css(animCss, 0);
	        	pos = 0;
	        	btnHoldFlag = false;
        	} else if ((ulSize+pos_new) < divSize) {
        		ul.css(animCss, divSize-ulSize);
	        	pos = divSize-ulSize;
	        	btnHoldFlag = false;
        	}
						       	
        	if(btnHoldFlag && !running) {
				setTimeout('window.slideLinear("'+px+'", "'+btn+'")', o.linearSlideInterval);
			}/* else {
				
				pos = pos_new;
				//running = true;
				//setTimeout('window.slideLinear("'+px+'", )', o.linearSlideInterval);
			}*/
        }
        
        /*function slideOnce() {
        	go(curr-o.scroll);
        }*/

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

        function slideOnce(to, easing) {
           if(!running) {

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

                /*if(o.circular) {            // If circular we are in first or last, then goto the other end
                    if(to<=o.start-v-1) {           // If first, then goto last
                        ul.css(animCss, -((itemLength-(v*2))*liSize)+"px");
                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements.
                        curr = to==o.start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-o.scroll;
                    } else if(to>=itemLength-v+1) { // If last, then goto first
                        ul.css(animCss, -( (v) * liSize ) + "px" );
                        // If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements.
                        curr = to==itemLength-v+1 ? v+1 : v+o.scroll;
                    } else curr = to;
                } else {                    // If non-circular and to points to first or last, we just return.*/                    
                	if(to<0 || to>itemLength-v) return;
                    else curr = to;
                /*}                           // If neither overrides it, the curr will still be "to" and we can proceed.*/

                running = true;
                
                if(!easing) {
                	var easing = o.slideOnceEasing;
                }

				/*if(!o.speed || useAbsSpeed) {
					var speed = Math.abs(pos+(curr*liSize))/(o.slideStep/o.mouseCheckSpeed);
				} else {
					var speed = o.speed;
				}*/
                ul.animate(
                    animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) } , o.slideOnceSpeed, easing,
                    function() {
                        /*if(o.afterEnd)
                            o.afterEnd.call(this, vis());*/
                        //ul.animate({top: -(curr*liSize)}, speed, o.easing); //Slowdown effect
                        pos = -(curr*liSize);
                        running = false;
                    }
                );
                // Disable buttons when the carousel reaches the last/first, and enable when not
                /*if(!o.circular) {
                    $(o.btnPrev + "," + o.btnNext).removeClass("disabled");
                    $( (curr-o.scroll<0 && o.btnPrev)
                        ||
                       (curr+o.scroll > itemLength-v && o.btnNext)
                        ||
                       []
                     ).addClass("disabled");
                }*/

            }
            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);