Alarm Trend Line Hit

//This indy has adopt from https://ctdn.com/algos/indicators/show/203
//Initial source code make for detect Horizontal line 
//But this I will check trendline Hit will alarm.


using System;
using System.IO;
using System.Collections.Generic;
using cAlgo.API;
using cAlgo.API.Indicators;

namespace cAlgo.Indicators
{
    [Indicator(TimeZone = TimeZones.UTC, IsOverlay = true, AutoRescale = false, AccessRights = AccessRights.FullAccess)]
    public class TrendLineAlarm : Indicator
    {
        const Colors AskColor = Colors.DeepSkyBlue;
        const Colors BidColor = Colors.Red;


        [Parameter("Spot price (Bid: 1, Ask: 2)", DefaultValue = 1, MinValue = 1, MaxValue = 2)]
        public double BidOrAsk { get; set; }

        [Output("Bid Target", Color = BidColor, LineStyle = LineStyle.Lines)]
        public IndicatorDataSeries BidTarget { get; set; }

        [Output("Ask Target", Color = AskColor, LineStyle = LineStyle.Lines)]
        public IndicatorDataSeries AskTarget { get; set; }
        [Parameter("Alarm Y/N?", DefaultValue = false)]
        public bool AlarmW { get; set; }

        [Output("Played Notification", Color = Colors.Gray, LineStyle = LineStyle.Lines)]
        public IndicatorDataSeries PlayedNotificationLine { get; set; }
        [Parameter("Sound Filename ", DefaultValue = "tada.wav")]
        public string wavefile { get; set; }
//Horizontal line
        //[Parameter()]
        //public double Price { get; set; }
//Trend line
        [Parameter("Date1(YYYYMMDDhhmm", DefaultValue = "201709151300")]
        public string startDate { get; set; }
        [Parameter("Point1", DefaultValue = 0.95642)]
        public double startValue { get; set; }
        [Parameter("Date2(YYYYMMDDhhmm", DefaultValue = "201709200900")]
        public string endDate { get; set; }
        [Parameter("Point2", DefaultValue = 0.9595)]
        public double endValue { get; set; }


        bool spotPriceWasAbove;
        int tickCount;
        bool triggered;

        static HashSet<Notification> PlayedNotifications = new HashSet<Notification>();

        protected override void Initialize()
        {
            if (endValue == 0)
                MarketData.GetMarketDepth(Symbol).Updated += AnimateWarning;

            if (BidOrAsk == 1)
                spotPriceWasAbove = Symbol.Bid > endValue;
            else
                spotPriceWasAbove = Symbol.Ask > endValue;

            if (NotificationWasPlayed())
            {
                triggered = true;
            }
        }

        private void AnimateWarning()
        {
            if (tickCount++ % 2 == 0)
                ChartObjects.DrawText("warning", "Please specify the Price", StaticPosition.Center, Colors.Red);
            else
                ChartObjects.DrawText("warning", "Please specify the Price", StaticPosition.Center, Colors.White);
        }

        public override void Calculate(int index)
        {


            if (IsRealTime)
            {
                var color = BidOrAsk == 1 ? BidColor : AskColor;
                var spotPrice = BidOrAsk == 1 ? Symbol.Bid : Symbol.Ask;
                string lineName = "TL";

                DateTime d1 = new DateTime(Convert.ToInt32(startDate.Substring(0, 4)), Convert.ToInt32(startDate.Substring(4, 2)), Convert.ToInt32(startDate.Substring(6, 2)), Convert.ToInt32(startDate.Substring(8, 2)), Convert.ToInt32(startDate.Substring(10, 2)), 0);
                int startIndex = MarketSeries.OpenTime.GetIndexByExactTime(d1);
                DateTime d2 = new DateTime(Convert.ToInt32(endDate.Substring(0, 4)), Convert.ToInt32(endDate.Substring(4, 2)), Convert.ToInt32(endDate.Substring(6, 2)), Convert.ToInt32(endDate.Substring(8, 2)), Convert.ToInt32(endDate.Substring(10, 2)), 0);
                int endIndex = MarketSeries.OpenTime.GetIndexByExactTime(d2);
                double slopeline = (endValue - startValue) / (endIndex - startIndex);
                double b = startValue - (slopeline * startIndex);
                double eValue = ((slopeline * index) + b);
                var distanceTL = Math.Round(Math.Abs(eValue - spotPrice) / Symbol.PipSize, 1);
                double Price = eValue;
                ChartObjects.DrawLine(lineName, startIndex, startValue, index, eValue, Colors.Red);
                ChartObjects.DrawText("distance", "" + distanceTL + " pips left", index + 5, Price, VerticalAlignment.Center, HorizontalAlignment.Right, color);
                if (spotPriceWasAbove && spotPrice <= Price || !spotPriceWasAbove && spotPrice >= Price)
                {
                    if (AlarmW)
                    {
                        var windowsFolder = Environment.GetFolderPath(Environment.SpecialFolder.Windows);
                        Notifications.PlaySound(Path.Combine(windowsFolder, "Media", wavefile));
                    }
                    triggered = true;

                    ChartObjects.RemoveObject("distance");

                    PlayedNotifications.Add(CreateNotification());

                    Print("Alarm : " + Symbol.Code + "  Hit Trend line !!! ");
                }
                if (triggered)
                {
                    PlayedNotificationLine[index] = eValue;
                    return;
                }

                if (BidOrAsk == 1)
                    BidTarget[index] = eValue;
                else
                    AskTarget[index] = eValue;

            }
        }

        private bool NotificationWasPlayed()
        {
            return PlayedNotifications.Contains(CreateNotification());
        }

        private Notification CreateNotification()
        {
            return new Notification 
            {
                Symbol = Symbol.Code,
                Price = endValue,
                BidIsSpotPrice = BidOrAsk == 1
            };
        }
    }

    struct Notification
    {
        public string Symbol;
        public double Price;
        public bool BidIsSpotPrice;
    }
}