/*
 * 	Easy Slider - jQuery plugin
 *	written by Alen Grakalic	
 *	http://cssglobe.com/post/3783/jquery-plugin-easy-image-or-content-slider
 *
 *	Copyright (c) 2009 Alen Grakalic (http://cssglobe.com)
 *	Dual licensed under the MIT (MIT-LICENSE.txt)
 *	and GPL (GPL-LICENSE.txt) licenses.
 *
 *	Built for jQuery library
 *	http://jquery.com
 *
 */
 
/*
 *	markup example for $("#images").easySlider();
 *	
 * 	<div id="images">
 *		<ul>
 *			<li><img src="images/01.jpg" alt="" /></li>
 *			<li><img src="images/02.jpg" alt="" /></li>
 *			<li><img src="images/03.jpg" alt="" /></li>
 *			<li><img src="images/04.jpg" alt="" /></li>
 *			<li><img src="images/05.jpg" alt="" /></li>
 *		</ul>
 *	</div>
 *
 */

function setWidthTotalImages() {
    var totWidthImage = 0;
    var ulObj = document.getElementById('ulElencoMarchi');
    var liElements = ulObj.getElementsByTagName("li");
    for (var i = 0; i < liElements.length; i++) {
        var img = liElements[i].getElementsByTagName("img")[0];
        //alert(getPos(img));
        totWidthImage += img.width;
        //alert('img name: ' + img.src + ' img.offsetLeft: ' + img.offsetLeft);
    }
    return totWidthImage;
}
function getPosLeft() {
    var ulObj = document.getElementById('ulElencoMarchi');
    var liElements = ulObj.getElementsByTagName("li");
    for (var i = 0; i < liElements.length; i++) {
        var img = liElements[i].getElementsByTagName("img")[0];
        alert('img.src: ' + img.src + getPos(img));
    }
}
(function($) {
    $.fn.easySlider = function(options) {
        var totWidthImage = setWidthTotalImages();
        // default configuration properties
        var defaults = {
            prevId: 'prevBtn',
            prevText: '',
            nextId: 'nextBtn',
            nextText: '',
            orientation: '', //  'vertical' is optional;
            autoscroll: false,
            delay: 3000,
            speed: 800
        };

        var options = $.extend(defaults, options);

        return this.each(function() {
            obj = $(this);

            var s = $("li", obj).length;
            var w = obj.width();
            //alert('ul width: ' + w);
            var h = obj.height();
            var ts = s - 1;
            var t = 0;

            var counter = 0;
            var numTotPages = parseInt(totWidthImage / w);
            if (totWidthImage % w > w) numTotPages++;

            var vertical = (options.orientation == 'vertical');
            $("ul", obj).css('width', s * w);

            if (!vertical) {
                $("li", obj).css('float', 'left');
            }
            //$(obj).after('<span id="'+ options.prevId +'"><a class=\"prev\" href=\"javascript:void(0);\">'+ options.prevText +'</a></span> <span id="'+ options.nextId +'"><a class=\"next\" href=\"javascript:void(0);\">'+ options.nextText +'</a></span>');		
            $(obj).before('<span id="' + options.prevId + '"><a class="prev" href=\"javascript:void(0);\">' + options.prevText + '</a></span>');
            $(obj).after('<span id="' + options.nextId + '"><a class="next" href=\"javascript:void(0);\">' + options.nextText + '</a></span>');
            ;
            $("a", "#" + options.prevId).hide();
            $("a", "#" + options.nextId).hide();
            //alert(obj.html())
            if (options.autoscroll) {
                interval = setInterval(function() { animate('next', true) }, options.delay); //time in milliseconds
                $(obj).hover(function() {
                    clearInterval(interval);
                }, function() {
                    interval = setInterval(function() { animate('next', true) }, options.delay); //time in milliseconds
                    animate("next");
                });
            }

            $("a", "#" + options.nextId).click(function() {
                if (options.autoscroll) {
                    clearInterval(interval);
                    interval = setInterval(function() { animate('next') }, options.delay); //time in milliseconds
                }
                animate("next");
                //                if (t >= ts) {
                //                    $(this).fadeOut();
                //                }
                if (counter >= numTotPages) {
                    $(this).fadeOut();
                }
                $("a", "#" + options.prevId).fadeIn();
            });

            $("a", "#" + options.prevId).click(function() {
                if (options.autoscroll) {
                    clearInterval(interval);
                    interval = setInterval(function() { animate('next') }, options.delay); //time in milliseconds
                }

                animate("prev");
                /*if (t <= 0) {
                $(this).fadeOut();
                }*/
                if (counter <= 0) {
                    $(this).fadeOut();
                }
                $("a", "#" + options.nextId).fadeIn();
            });


            function animate(dir, loop) {

                if (typeof (loop) == 'undefined') { loop = false; }

                if (dir == "next") {
                    if (loop) {
                        t = (t >= ts) ? 0 : t + 1;
                    }
                    else {
                        //t = (t >= ts) ? ts : t + 1;
                        counter = (counter < numTotPages) ? counter +=1 : 0;
                    }
                }
                else {
                    //t = (t <= 0) ? 0 : t - 1;
                    counter = (counter <= 0) ? 0 : counter -=1;
                };

                if (!vertical) {
                    //p = (t * w * -1);
                    p = (counter * w * -1);
                    $("ul", obj).animate(
						{ marginLeft: p },
						options.speed
					);

                }
                else {
                    p = (t * h * -1);
                    $("ul", obj).animate(
						{ marginTop: p },
						options.speed
					);
                }
            };
            if (s > 1) $("a", "#" + options.nextId).fadeIn();

        });
    };
})(jQuery);