using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using RealTimeGraphEx.Models;
using RealTimeGraphEx.DataSeries;
using RealTimeGraphEx.Controllers;
using System.Runtime.ExceptionServices;
using RealTimeGraphEx.DX2D;
using RealTimeGraphEx.FastGraphs;
using System.Windows.Controls;

namespace RealTimeGraphEx.DirectXGraphs
{
    /// <summary>
    /// Represents a real-time graph with a single scrollable line.
    /// </summary>
    public class RealTimeGraphExDirectXLineErase : RealTimeGraphExDirectXLineScroll
    {
        #region Cross Thread Fields

        protected Brush _markerBrush;
        protected bool _showMarker;
        protected double _markerStrokeWidth;
        protected int _currentReplaceIndex;

        #endregion

        #region Properties

        public Brush MarkerBrush
        {
            get { return (Brush)GetValue(MarkerBrushProperty); }
            set { SetValue(MarkerBrushProperty, value); }
        }
        public static readonly DependencyProperty MarkerBrushProperty =
            DependencyProperty.Register("MarkerBrush", typeof(Brush), typeof(RealTimeGraphExDirectXLineErase), new PropertyMetadata(Brushes.Red, new PropertyChangedCallback(CrossModelChanged)));

        public bool ShowMarker
        {
            get { return (bool)GetValue(ShowMarkerProperty); }
            set { SetValue(ShowMarkerProperty, value); }
        }
        public static readonly DependencyProperty ShowMarkerProperty =
            DependencyProperty.Register("ShowMarker", typeof(bool), typeof(RealTimeGraphExDirectXLineErase), new PropertyMetadata(true, new PropertyChangedCallback(CrossModelChanged)));

        public double MarkerStrokeWidth
        {
            get { return (double)GetValue(MarkerStrokeWidthProperty); }
            set { SetValue(MarkerStrokeWidthProperty, value); }
        }
        public static readonly DependencyProperty MarkerStrokeWidthProperty =
            DependencyProperty.Register("MarkerStrokeWidth", typeof(double), typeof(RealTimeGraphExDirectXLineErase), new PropertyMetadata(1.0, new PropertyChangedCallback(CrossModelChanged)));

        #endregion

        #region Constructor

        public RealTimeGraphExDirectXLineErase()
            : base()
        {

        }

        #endregion

        #region Override Methods

        protected override void Initialize()
        {
            base.Initialize();
            dxGraph = new DXGraphSurfaceSingleErase() { HorizontalAlignment = System.Windows.HorizontalAlignment.Left, VerticalAlignment = System.Windows.VerticalAlignment.Stretch };

            gridMain.Children.Remove(img);

            if (!gridMain.Children.Contains(dxGraph))
            {
                gridMain.Children.Add(dxGraph);
            }

            dxGraph.IsHitTestVisible = false;
            Grid.SetColumnSpan(dxGraph, 3);
        }

        protected override void OnSetCrossThreadFields()
        {
            base.OnSetCrossThreadFields();

            this.Dispatcher.Invoke(() =>
            {
                _markerBrush = MarkerBrush;
                _markerStrokeWidth = MarkerStrokeWidth;
                _showMarker = ShowMarker;

            }, DispatcherPriority.Send);
        }

        protected override void OnClearGraph()
        {
            base.OnClearGraph();
            _currentReplaceIndex = 0;
        }

        protected internal override void OnRenderGraph()
        {
            if (_graphController.dataSeries != null && _graphController.dataSeries.Points != null && _graphController.dataSeries.Points.Count > 0 && _width > 1 && _height > 1)
            {
                var points = _graphController.dataSeries.Points.GetAndClearAllPoints();

                if (!_isPaused)
                {

                    for (int i = 0; i < points.Count; i++)
                    {
                        double value = points[i];
                        NormalizeValue(ref value);

                        if (graphPolygon.Count > _maxPoints)
                        {
                            graphPolygon.Replace(value, _currentReplaceIndex++);
                        }
                        else
                        {
                            graphPolygon.Add(value);
                        }

                        if (_currentReplaceIndex > graphPolygon.Count - 1)
                        {
                            _currentReplaceIndex = 0;
                        }
                    }
                }
            }

            updateCounter++;

            if (updateCounter >= 1)
            {
                updateCounter = 0;

                if (!_disableRendering)
                {
                    OnDrawVisuals();
                }
            }
        }

        protected override void OnDrawVisuals()
        {
            if (graphPolygon.Count > 0)
            {
                double markerPosition = 0;
                if (_currentReplaceIndex > 0)
                {
                    markerPosition = (((_currentReplaceIndex - 1) * GetPolygonScaleFactor()) + _offSetX);
                }

                Brush stroke = _graphController.dataSeries.stroke != null ? _graphController.dataSeries.stroke : _stroke;
                Brush fill = _graphController.dataSeries.fill != null ? _graphController.dataSeries.fill : _fill;
                (dxGraph as DXGraphSurfaceSingleErase).SetProperties(
                    graphPolygon.ToDXPolygonPoints(_offSetX, _offSetY, GetPolygonScaleFactor(), ConvertYToImageYFliped),
                    _fillGraph ? graphPolygon.ToDXPolygonPointsFill(_offSetX, _offSetY, _mainWidth, _mainHeight, GetPolygonScaleFactor(),
                    ConvertYToImageYFliped) : null,
                    stroke,
                    _strokeWidth,
                    _fillGraph,
                    fill,
                    _antialiased,
                    _markerBrush,
                    markerPosition,
                    _showMarker,
                    _markerStrokeWidth);

                dxGraph.EnableRendering();
            }
        }

        #endregion

    }
}