var Timer = function (a, b) {
        return this._init(a, b)
    };
Timer.prototype = {
    VERSION: 1,
    _init: function (a, b) {
        this._interval = 1000;
        this._timer = null;
        this._cbs = [];
        this._multipliers = [];
        this._tickCounts = [];
        this._canRun = [];
        this._stoppedThreads = 0;
        this._runOnce = false;
        this._startedAt = -1;
        this._pausedAt = -1;
        if (typeof (a) == "number") {
            this._interval = a
        }
        this.addCallback(b);
        return this
    },
    _preset: function () {
        this._stoppedThreads = 0;
        this._startedAt = -1;
        this._pausedAt = -1;
        for (var a = 0; a < this._cbs.length; a++) {
            this._canRun[a] = true;
            this._tickCounts[a] = 0
        }
    },
    _ticks: function (b) {
        var c = this;
        for (var a = 0; a < this._cbs.length; a++) {
            if (typeof (this._cbs[a]) == "function" && this._canRun[a]) {
                this._tickCounts[a]++;
                if (this._tickCounts[a] == this._multipliers[a]) {
                    this._tickCounts[a] = 0;
                    if (this.runOnce()) {
                        this._canRun[a] = false;
                        this._stoppedThreads++
                    }
                    window.setTimeout(c._cbs[a], 0)
                }
            }
        }
        if (this.runOnce() && this._stoppedThreads == this._cbs.length) {
            this.stop()
        }
        if (typeof (b) == "number") {
            this.stop().start(null, true)
        }
    },
    runOnce: function (a) {
        if (typeof (a) == "undefined") {
            return this._runOnce
        } else {
            if (typeof (a) == "boolean") {
                this._runOnce = a
            } else {
                alert("Invalid argument for runOnce(...).\n\nUsage: runOnce(true | false) /*Default value: false*/\nor, runOnce() to get status")
            }
        }
        return this
    },
    interval: function (a) {
        if (typeof (a) == "undefined") {
            return this._interval
        } else {
            if (typeof (a) == "number") {
                this._interval = Math.floor(a)
            }
        }
        return this
    },
    stop: function (a) {
        if (this._timer) {
            if (!a) {
                this._pausedAt = -1
            }
            try {
                window.clearInterval(this._timer)
            } catch (b) {}
            this._timer = null
        }
        return this
    },
    isStopped: function () {
        return ((this._timer == null) && !this.isPaused())
    },
    start: function (c, a) {
        if (this.isPaused()) {
            return this.resume()
        }
        if (!this.isStopped()) {
            return this
        }
        if (!a) {
            this._preset()
        }
        var b = this._interval;
        if (typeof (c) == "number") {
            b = c
        }
        var d = this;
        this._timer = window.setInterval(function () {
            d._ticks(c)
        }, b);
        this._startedAt = (new Date()).getTime();
        this._startedAt -= (this._interval - b);
        return this
    },
    pause: function () {
        if (this._timer) {
            this._pausedAt = (new Date()).getTime();
            this.stop(true)
        }
        return this
    },
    isPaused: function () {
        return (this._pausedAt >= 0)
    },
    resume: function () {
        if (this.isPaused()) {
            var a = this._interval - ((this._pausedAt - this._startedAt) % this._interval);
            this._pausedAt = -1;
            this.start(a, true)
        }
        return this
    },
    restart: function () {
        return this.stop().start()
    },
    addCallback: function (b, a) {
        if (typeof (b) == "function") {
            this._cbs.push(b);
            if (typeof (a) == "number") {
                a = Math.floor(a);
                this._multipliers.push((a < 1 ? 1 : a))
            } else {
                this._multipliers.push(1)
            }
            this._tickCounts.push(0);
            this._canRun.push(true)
        }
        return this
    },
    clearCallbacks: function () {
        this._cbs.length = 0;
        this._multipliers.length = 0;
        this._canRun.length = 0;
        this._tickCounts.length = 0;
        this._stoppedThreads = 0;
        return this
    }
};