/*
 * 	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($) {

    $.fn.easySlider = function(options) {

        // default configuration properties
        var defaults = {
            prevId: 'prevBtn',
            prevText: 'Previous',
            nextId: 'nextBtn',
            nextText: 'Next',
            firstId: 'btnFirst',
            lastId: 'btnLast',
            pageListingsId: 'pageListings',
            displayButtonsAtStart: false,
            startMiddle: true,
            startIndex: -1,
            pageLinksShown: 9,
            orientation: '', //  'vertical' is optional;
            speed: 800,
            afterSlide: null
        };

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


        return this.each(function() {
            obj = $(this);
            var s = $("ul > li", obj).length;   // total number of items
            var w = obj.width();                // width
            var h = obj.height();               // height
            var ts = s - 1;
            var t = 0;                          // current element
            var vertical = (options.orientation == 'vertical');

            $("ul", obj).css('width', s * w);
            if (!vertical) $("ul > li", obj).css('float', 'left');

            if (options.startMiddle && s > 2)
                goToFrame(Math.floor(s / 2));    // start at middle item
            else if (options.startIndex >= 0)
                goToFrame(options.startIndex);
            else
                goToFrame(0);

            $("#" + options.prevId).hide();
            $("#" + options.nextId).hide();

            if (options.displayButtonsAtStart)
                displayButtons();

            $("#" + options.nextId).click(function() {
                animate("next", 1);
                //return false;
            });
            $("#" + options.prevId).click(function() {
                animate("prev", 1);
                //return false;
            });

            if (s > 1) {
                $('#' + options.firstId).attr('href', '#s=0').click(function() {
                    animate("prev", t);
                });
                $('#' + options.lastId).attr('href', '#s=' + ts).click(function() {
                    animate("next", ts - t);
                });
            }

            $('#' + options.pageListingsId + ' a').live("click", function() {
                var p = $(this).html() - 1;

                if (p > t)
                    animate("next", p - t);
                else if (p < t)
                    animate("prev", t - p);
                //return false;
            });
            function displayButtons() {
                if (t > 0) {
                    if ($.support.opacity)
                        $("#" + options.prevId).fadeIn();
                    else
                        $("#" + options.prevId).show();
                } else {
                    $("#" + options.prevId).fadeOut();
                }

                if (t < ts) {
                    if ($.support.opacity)
                        $("#" + options.nextId).fadeIn();
                    else
                        $("#" + options.nextId).show();
                } else {
                    $("#" + options.nextId).fadeOut();
                }
            };
            function goToFrame(f) {
                t = f;

                $("ul", obj).css((!vertical) ? 'margin-left' : 'margin-top', (-1 * t * w) + 'px');
                drawPageListings();

                if (typeof (options.afterSlide) == "function")
                    options.afterSlide(t);
            };
            function animate(dir, skip) {
                if (dir == "next") {
                    if (skip > 1) {
                        goToFrame(t + skip - 1);
                        skip = 1;
                    }

                    t = (t >= ts) ? ts : t + 1;
                } else {
                    if (skip > 1) {
                        goToFrame(t - skip + 1);
                        skip = 1;
                    }

                    t = (t <= 0) ? 0 : t - 1;
                };

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

                $("#" + options.prevId).each(function() {
                    $(this).attr('href', '#s=' + t);
                });
                $('#forward').attr('href', '#s=' + t);
                $("#" + options.nextId).attr('href', '#s=' + t);

                drawPageListings();
                displayButtons();
                if (typeof (options.afterSlide) == "function")
                    options.afterSlide(t);
            };
            function drawPageListings() {
                t = parseInt(t);
                if (options.pageListingsId != '') {
                    $('#' + options.pageListingsId).html('');

                    var start = 1, end = s;

                    if (options.pageLinksShown < s) {
                        start = t - Math.floor(options.pageLinksShown / 2) + 1;
                        if (start <= 0) start = 1;
                        end = start + options.pageLinksShown - 1;
                        if (end > s) {
                            end = s;
                            start = s - options.pageLinksShown;
                        }
                    }

                    for (var i = start; i <= end; i++) {

                        var a = $('<a></a>').addClass('Page').html(i);

                        if (t + 1 != i)
                            a.attr('href', '#s=' + (i - 1));
                        else
                            a.addClass('pagingActive')

                        $('#' + options.pageListingsId).append(a);

                    }
                }
            };
        });

    };

})(jQuery);