/**
* jQuery.timers - Timer abstractions for jQuery
* Written by Blair Mitchelmore (blair DOT mitchelmore AT gmail DOT com)
* Licensed under the WTFPL (http://sam.zoy.org/wtfpl/).
* Date: 2009/10/16
*
* @author Blair Mitchelmore
* @version 1.2
*
**/

jQuery.fn.extend({
    everyTime: function(interval, label, fn, times) {
        return this.each(function() {
            jQuery.timer.add(this, interval, label, fn, times);
        });
    },
    oneTime: function(interval, label, fn) {
        return this.each(function() {
            jQuery.timer.add(this, interval, label, fn, 1);
        });
    },
    stopTime: function(label, fn) {
        return this.each(function() {
            jQuery.timer.remove(this, label, fn);
        });
    }
});

jQuery.extend({
    timer: {
        global: [],
        guid: 1,
        dataKey: "jQuery.timer",
        regex: /^([0-9]+(?:\.[0-9]*)?)\s*(.*s)?$/,
        powers: {
            // Yeah this is major overkill...
            'ms': 1,
            'cs': 10,
            'ds': 100,
            's': 1000,
            'das': 10000,
            'hs': 100000,
            'ks': 1000000
        },
        timeParse: function(value) {
            if (value == undefined || value == null)
                return null;
            var result = this.regex.exec(jQuery.trim(value.toString()));
            if (result[2]) {
                var num = parseFloat(result[1]);
                var mult = this.powers[result[2]] || 1;
                return num * mult;
            } else {
                return value;
            }
        },
        add: function(element, interval, label, fn, times) {
            var counter = 0;

            if (jQuery.isFunction(label)) {
                if (!times)
                    times = fn;
                fn = label;
                label = interval;
            }

            interval = jQuery.timer.timeParse(interval);

            if (typeof interval != 'number' || isNaN(interval) || interval < 0)
                return;

            if (typeof times != 'number' || isNaN(times) || times < 0)
                times = 0;

            times = times || 0;

            var timers = jQuery.data(element, this.dataKey) || jQuery.data(element, this.dataKey, {});

            if (!timers[label])
                timers[label] = {};

            fn.timerID = fn.timerID || this.guid++;

            var handler = function() {
                if ((++counter > times && times !== 0) || fn.call(element, counter) === false)
                    jQuery.timer.remove(element, label, fn);
            };

            handler.timerID = fn.timerID;

            if (!timers[label][fn.timerID])
                timers[label][fn.timerID] = window.setInterval(handler, interval);

            this.global.push(element);

        },
        remove: function(element, label, fn) {
            var timers = jQuery.data(element, this.dataKey), ret;

            if (timers) {

                if (!label) {
                    for (label in timers)
                        this.remove(element, label, fn);
                } else if (timers[label]) {
                    if (fn) {
                        if (fn.timerID) {
                            window.clearInterval(timers[label][fn.timerID]);
                            delete timers[label][fn.timerID];
                        }
                    } else {
                        for (var fn in timers[label]) {
                            window.clearInterval(timers[label][fn]);
                            delete timers[label][fn];
                        }
                    }

                    for (ret in timers[label]) break;
                    if (!ret) {
                        ret = null;
                        delete timers[label];
                    }
                }

                for (ret in timers) break;
                if (!ret)
                    jQuery.removeData(element, this.dataKey);
            }
        }
    }
});

jQuery(window).bind("unload", function() {
    jQuery.each(jQuery.timer.global, function(index, item) {
        jQuery.timer.remove(item);
    });
});

/* NEWS TICKER */

var newsTicker = (function() {
    var newsItems = new Array();

    function startTimer() {
        return $("ul#newsItems").everyTime(6000, "newsTicker", function() {
            // Timer fucntion
            newsTicker.showNewsItem();
        })
    }

    return {
        init: function() {
            // Chained for jQuery optimisation, only hits the DOM once
            startTimer()
            .find("li")
            .each(function(i) {
                var domObject = $(this);

                if (i > 0) {
                    domObject.css({ "display": "none"});
                }
                newsItems.push(domObject.css({ "white-space": "nowrap" }));
            }); // Populate array

            $("#play").live("click",
                function(e) {
                    newsTicker.play();
                    newsTicker.status = "play";
                    $(this).attr("id", "pause").find("a").text("Pause");
                    e.preventDefault();
                });

            $("#pause").live("click",
                function(e) {
                    newsTicker.pause();
                    newsTicker.status = "pause";
                    $(this).attr("id", "play").find("a").text("Play");
                    e.preventDefault();
                });

            $("#next").click(function(e) {
                newsTicker.showNewsItem();
                e.preventDefault();
            });

            $("#prev").click(function(e) {
                newsTicker.showNewsItem("previous");
                e.preventDefault();
            });

        } (),
        status: "play",
        currentIndex: 0,
        previousIndex: 0,
        animating: false,
        zeroBasedLength: parseInt(newsItems.length) - 1,
        showNewsItem: function(direction) {
            if (!this.animating) {
                this.animating = true;
                this.previousIndex = this.currentIndex;

                if (direction === "previous") {
                    newsTicker.currentIndex--;
                }
                else {
                    newsTicker.currentIndex++;
                }

                var showIndex = this.currentIndex;
                if (showIndex > this.zeroBasedLength) {
                    this.currentIndex = showIndex = 0;
                }
                else if (showIndex < 0) {
                    this.currentIndex = showIndex = this.zeroBasedLength;
                }

                if (newsTicker.status === "play") {
                    newsTicker.status = "pause";
                    this.pause();
                }
                newsItems[this.previousIndex].fadeOut("slow", function() {
                    newsItems[showIndex].fadeIn("slow");
                    newsTicker.animating = false;

                    if (newsTicker.status === "pause") {
                        newsTicker.status = "play";
                        startTimer();
                    }

                });
            }
        },
        pause: function() { $("ul#newsItems").stopTime("newsTicker"); },
        play: function() { startTimer(); }
    }
})();