class Time {

    constructor(game: Game) {

        this._started = Date.now();
        this._timeLastSecond = this._started;
        this.time = this._started;

    }

    private _game: Game;
    private _started: number;


    public timeScale: number = 1.0;
    public elapsed: number = 0;

    /**
    *
    * @property time
    * @type Number
    */
    public time: number = 0;

    /**
    *
    * @property now
    * @type Number
    */
    public now: number = 0;

    /**
    *
    * @property delta
    * @type Number
    */
    public delta: number = 0;

    /**
    *
    * @method totalElapsedSeconds
    * @return {Number}
    */
    public get totalElapsedSeconds(): number {

        return (this.now - this._started) * 0.001;

    }

    public fps: number = 0;
    public fpsMin: number = 1000;
    public fpsMax: number = 0;
    public msMin: number = 1000;
    public msMax: number = 0;
    public frames: number = 0;

    private _timeLastSecond: number = 0;

    /**
    *
    * @method update
    */
    public update() {

        // Can we use performance.now() ?
        this.now = Date.now(); // mark
        this.delta = this.now - this.time; // elapsedMS

        this.msMin = Math.min(this.msMin, this.delta);
        this.msMax = Math.max(this.msMax, this.delta);

        this.frames++;

        if (this.now > this._timeLastSecond + 1000)
        {
            this.fps = Math.round((this.frames * 1000) / (this.now - this._timeLastSecond));
            this.fpsMin = Math.min(this.fpsMin, this.fps);
            this.fpsMax = Math.max(this.fpsMax, this.fps);

            this._timeLastSecond = this.now;
            this.frames = 0;
        }

        this.time = this.now; // _total

        ////  Lock the delta at 0.1 to minimise fps tunneling
        //if (this.delta > 0.1)
        //{
        //    this.delta = 0.1;
        //}

    }

    /**
    *
    * @method elapsedSince
    * @param {Number} since
    * @return {Number}
    */
    public elapsedSince(since: number): number {

        return this.now - since;

    }

    /**
    *
    * @method elapsedSecondsSince
    * @param {Number} since
    * @return {Number}
    */
    public elapsedSecondsSince(since: number): number {

        return (this.now - since) * 0.001;

    }

    /**
    *
    * @method reset
    */
    public reset() {

        this._started = this.now;

    }

}