/**
 * Wayfarer Carousel
 * Version 0.9.5
 * Author Abel Mohler
 * URI: http://www.wayfarerweb.com/wcarousel.php
 * Released with the MIT License: http://www.wayfarerweb.com/mit.php
 */

/**
 * Based on jCarouselLite (modified and improved)
 *
 * 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
 */

(function($) {                                          // Compliant with jquery.noConflict()
$.fn.wCarousel = function(o, callback) {
    o = $.extend({
		prev: null,
        next: null,
        btnGo: null,
        mouseWheel: false,
        auto: null,

        speed: 200,
        easing: null,

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

        callBefore: null,
        callAfter: null
    }, o || {});
	
	if (typeof callback == "function")
		o.callAfter = callback;
		
	var talk = (typeof $.talk == "function" && typeof $.listen == "function") ? true : false;
	
	if(talk) {
		o.plugin = "wCarousel";
		o.channel = "wayfarer";
		o.key = this;
		$.talk(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;
		
        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", position: "relative", "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.prev)
            $(o.prev).click(function() {
                return go(curr - o.scroll);
            });
			
        if(o.next)
            $(o.next).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) {

                if(typeof o.callBefore == "function") {
					o.callBefore.call(this, vis(), o);
					if(talk) o = $.listen(o);
				}

                if(o.circular) {            // If circular we are in first or last, then goto the other end
                    if(to < 0) {           // If first, then goto last //(bug fix: if(to<=o.start-v-1) becomes if(to<0)
                        //alert(curr);
						
						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; //itemLength-(v*2)-1 became itemLength-(v*2)-v
                    } 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;

                ul.animate(
                    animCss == "left" ? { left: -(curr * liSize) } : { top: -(curr * liSize) } , o.speed, o.easing,
                    function() {
                        if(typeof o.callAfter == "function") {
							 o.callAfter.call(this, vis(), o);
							 if(talk) o = $.listen(o);
						}
                        running = false;
                    }
                );
                // Disable buttons when the carousel reaches the last/first, and enable when not
                if(!o.circular) {
                    $(o.prev + "," + o.next).removeClass("disabled");
                    $( (curr - o.scroll < 0 && o.prev)
                        ||
                       (curr + o.scroll > itemLength - v && o.next)
                        ||
                       []
                     ).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);