/*
 * 	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',
            orientation: '', //  'vertical' is optional;
            speed: 800,
            slide: 0,
            start: '',
            stop: ''
        };

        var options = $.extend(defaults, options);
        var actionPrev = false;
        var actionNext = false;

        return this.each(function() {
            obj = $(this);
            var s = $("li", obj).length;
            var w = (options.slide <= 0) ? obj.width() : options.slide;
            var h = obj.height();
            var ts = s - 1;
            var vertical = (options.orientation == 'vertical');
            var firsttime = (document.getElementById('btnAnt') == null);
            var t;

            if (firsttime) {
                $(obj).after('<span id="' + options.prevId + '"><a href=\"javascript:void(0);\">' + options.prevText + '</a></span> <span id="' + options.nextId + '"><a href=\"javascript:void(0);\">' + options.nextText + '</a></span>');
                RemoveButtons();

                $("a", "#" + options.nextId).click(function() { NextClick() });
                $("a", "#" + options.prevId).click(function() { PrevClick(); });
                firsttime = false;
            }

            if (s > 4) {
                $("ul", obj).css('width', s * w);
                ControlButtons();
            }
            else {
                RemoveButtons();
            }

            function PrevClick() {
                if (actionPrev)
                    animate("prev");

                ControlButtons();
            }

            function NextClick() {
                if (actionNext)
                    animate("next");

                ControlButtons();


            }
            function RemoveButtons() {
                $("a", "#" + options.nextId).addClass("btnPrxDisabled");
				$("a", "#" + options.prevId).removeClass("btnAntDisabled");
                //$("a", "#" + options.prevId).hide();
                //$("a", "#" + options.nextId).hide();
            }
            function ControlButtons() {
                s = $("li", obj).length;
                var escondido = larguraslider / options.slide * -1;
                if (escondido >= s - 4) {
                    //$("a", "#" + options.nextId).hide();
                    $("a", "#" + options.nextId).addClass("btnPrxDisabled");
                    actionNext = false;
                }
                else {
                    $("a", "#" + options.nextId).show();
                    $("a", "#" + options.nextId).removeClass("btnPrxDisabled");
                    actionNext = true;
                }

                if (larguraslider < 0) {
                    $("a", "#" + options.prevId).show();
                    $("a", "#" + options.prevId).removeClass("btnAntDisabled");
                    actionPrev = true;
                }
                else {                    
                    //$("a", "#" + options.prevId).hide();
                    $("a", "#" + options.prevId).addClass("btnAntDisabled");
                    actionPrev = false;
                }
            }

            function animate(dir) {
                if (!firsttime && options.start != '') {
                    eval(options.start);
                    if (options.stop != '') {
                        setTimeout(options.stop, options.speed * 1.2);
                    }
                }

                ts = $("li", obj).length - 1;
                if (dir == "next") {
                    t = (t >= ts) ? ts : t + 1;
                } else if (dir == "prev") {
                    t = (t <= 0) ? 0 : t - 1;
                };

                if (dir == "next") {
                    larguraslider -= options.slide;
                } else if (dir == "prev") {
                    larguraslider += options.slide;
                };

                if (!vertical) {
                    $("ul", obj).animate(
						{ marginLeft: larguraslider },
						options.speed
					);
                } else {
                    $("ul", obj).animate(
						{ marginTop: larguraslider },
						options.speed
					);
                }


            };
        });

    };
})(jQuery);