using SciChart.Charting.Model.ChartSeries;
using SciChart.Charting.Model.DataSeries;
using SciChart.Charting.Visuals.Annotations;
using SciChart.Charting.Visuals.Events;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace Regress.WPF.Extensions
{
    public class VerticalLineExtension: VerticalLineAnnotationViewModel
    {
        private int startpointidx;
        private IComparable startpointvalue;
        public IDataSeries ParentSeries { get; set; }

        public VerticalLineExtension():base()
        {
            this.DragDelta += VerticalLineExtension_DragDelta;
            this.DragStarted += VerticalLineExtension_DragStarted;            
        }

        
        private void VerticalLineExtension_DragStarted(object sender, EventArgs e)
        {
            startpointidx = ((XyDataSeries<DateTime, double>)ParentSeries).FindIndex(X1, SciChart.Charting.Common.Extensions.SearchMode.Nearest);
            if (startpointidx>=0)
                startpointvalue = ((XyDataSeries<DateTime, double>)ParentSeries).XValues[startpointidx];
        }

        public event EventHandler<AnnotationDragToPointEventArgs> DragToPoint;

        
        private void VerticalLineExtension_DragDelta(object sender, SciChart.Charting.Visuals.Events.AnnotationDragDeltaEventArgs e)
        {            
            var newNearestValueIndex =((XyDataSeries<DateTime,double>) ParentSeries).FindIndex(X1,SciChart.Charting.Common.Extensions.SearchMode.Nearest );
            if (newNearestValueIndex < 0 || startpointidx < 0)
                return;
            var NearestValue = ((XyDataSeries<DateTime, double>)ParentSeries).XValues[newNearestValueIndex];

            if (startpointidx == newNearestValueIndex)
                X1 = startpointvalue;
            else
            {
                X1 = NearestValue;                
                if (DragToPoint != null)
                    DragToPoint.Invoke(sender, new AnnotationDragToPointEventArgs { OldIndex = startpointidx, NewIndex = newNearestValueIndex });
                startpointidx = newNearestValueIndex;
                startpointvalue = NearestValue;                
            }

        }

        public int Valuetype { get; set; }
        
        
    }

    public class AnnotationDragToPointEventArgs:EventArgs
    {
        public int OldIndex { get; set; }
        public int NewIndex { get; set; }
    }
}