/*!
 * liScroll 1.0 updated by @davetayls
 * Examples and documentation at: 
 * http://www.gcmingati.net/wordpress/wp-content/lab/jquery/newsticker/jq-liscroll/scrollanimate.html
 * 2007-2009 Gian Carlo Mingati
 * Version: 1.0.1 (07-DECEMBER-2009)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 * Requires:
 * jQuery v1.2.x or later
 * 
 */
jQuery.fn.liScroll = function(settings) {
    settings = jQuery.extend({
        travelocity: 0.05,
        showControls: false
    }, settings);
    return this.each(function() {
        var strip = this;
        var $strip = jQuery(strip);
        $strip.addClass("liScroll-ticker")
        $stripItems = $strip.find("li");
        var stripWidth = 0;
        var $mask = $strip.wrap("<div class='liScroll-mask'></div>");
        var $tickercontainer = $strip.parent().wrap("<div class='liScroll-container'></div>").parent();
        var paused = false;
        var containerWidth = $strip.parent().parent().width(); //a.k.a. 'mask' width

        var currentItemIndex = function() {
            var index = 0;
            var currentLeft = parseInt($strip.css("left"));
            var accumulatedWidth = 0;
            if (currentLeft > 0) {
                return 0;
            } else {
                $strip.find("li").each(function(i) {
                    if (currentLeft == (0 - accumulatedWidth)) {
                        index = i;
                        return false;
                    }
                    accumulatedWidth += jQuery(this).width();
                    if (currentLeft > (0 - accumulatedWidth)) {
                        index = i;
                        return false;
                    }
                    return true;
                });
            }
            return index;
        };
        var next = function() {
            pause();
            var index = currentItemIndex();
            if (index >= $stripItems.length - 1) {
                $strip.css("left", "0px");
            } else {
                var $itm = $stripItems.eq(index + 1);
                $strip.css("left", (0 - $itm.position().left) + "px");
            }
        };
        var pause = function() {
            $strip.stop();
            $tickercontainer
                .removeClass("liScroll-playing")
                .addClass("liScroll-paused");
            paused = true;
        };
        var previous = function() {
            pause();
            var index = currentItemIndex();
            var $itm = null;
            if (index == 0) {
                $itm = $stripItems.eq($stripItems.length - 1);
            } else {
                $itm = $stripItems.eq(index - 1);
            }
            $strip.css("left", (0 - $itm.position().left) + "px");
        };
        var play = function() {
            var offset = $strip.offset();
            var residualSpace = offset.left + stripWidth;
            var residualTime = residualSpace / settings.travelocity;
            scrollnews(residualSpace, residualTime);
            $tickercontainer
                .addClass("liScroll-playing")
                .removeClass("liScroll-paused");
            paused = false;
        };
        var togglePlay = function() {
            if (paused) {
                play();
            } else {
                pause();
            }
        };

        if (settings.showControls) {
            var $prev = $("<div class='liScroll-prev'>&lt;</div>")
                .appendTo($tickercontainer)
                .click(function() { previous.call(strip); });
            var $pause = $("<div class='liScroll-play'>Pause</div>")
                .appendTo($tickercontainer)
                .click(function() { togglePlay.call(strip); });
            var $next = $("<div class='liScroll-next'>&gt;</div>")
                .appendTo($tickercontainer)
                .click(function() { next.call(strip); });
        }


        $stripItems.each(function(i) {
            stripWidth += jQuery(this, i).width();
        });
        $strip.width(stripWidth);

        var totalTravel = stripWidth + containerWidth;
        var defTiming = totalTravel / settings.travelocity; // thanks to Scott Waye		


        function scrollnews(spazio, tempo) {
            $strip.animate({ left: '-=' + spazio }, tempo, "linear", function() { $strip.css("left", containerWidth); scrollnews(totalTravel, defTiming); });
        }
        scrollnews(totalTravel, defTiming);
        $tickercontainer.addClass("liScroll-playing")
        $strip.hover(pause, play);
    });
};