namespace NinjaTrader.NinjaScript.Indicators
{
    public class Diff : Indicator
    {
        private PriorDayOHLC PriorDayOHLC1;
        private PriorDayOHLC PriorDayOHLC2;

        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Description                                 = @"Enter the description for your new custom Indicator here.";
                Name                                        = "Diff";
                Calculate                                   = Calculate.OnBarClose;
                IsOverlay                                   = false;
                DisplayInDataBox                            = true;
                DrawOnPricePanel                            = true;
                DrawHorizontalGridLines                     = true;
                DrawVerticalGridLines                       = true;
                PaintPriceMarkers                           = true;
                ScaleJustification                          = NinjaTrader.Gui.Chart.ScaleJustification.Right;
                //Disable this property if your indicator requires custom values that cumulate with each new market data event.
                //See Help Guide for additional information.
                IsSuspendedWhileInactive                    = true;
                AddPlot(Brushes.White, "Diff");
            }
            else if (State == State.Configure)
            {
            }
        }

        protected override void OnBarUpdate()
        {
            if (CurrentBars[0] <= 55)
                return;

            if (BarsInProgress != 0)
                return;


            if (PriorDayOHLC1.PriorHigh[1] - PriorDayOHLC2.PriorOpen[1] == 0) // check for potential divide by zero
                {
                    return; // don't plot the value
                }

            double PDHigh = PriorDayOHLC1.PriorHigh[1];
            double PDOpen = PriorDayOHLC2.PriorOpen[1];


            Value[0] = PDHigh - PDOpen;


        }

        #region Properties

        [Browsable(false)]
        [XmlIgnore]
        public Series<double> Diff
        {
            get { return Values[0]; }
        }

        #endregion
    }
}