// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows;
using System.Windows.Cont
using RealTimeGraphEx.DX2D;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Threading;

namespace RealTimeGraphEx.DirectXGraphs
{
    public class RealTimeGraphExDirectXMultiLineErase : RealTimeGraphExDirectXMultiLineScroll
    {
        #region Cross Thread Fields

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

        #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(RealTimeGraphExDirectXMultiLineErase), 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(RealTimeGraphExDirectXMultiLineErase), 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(RealTimeGraphExDirectXMultiLineErase), new PropertyMetadata(1.0, new PropertyChangedCallback(CrossModelChanged)));

        #endregion

        #region Constructor

        public RealTimeGraphExDirectXMultiLineErase()
            : base()
        {

        }

        #endregion

        #region Override Methods

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

            dxGraph = new DXGraphSurfaceMultiErase() { 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;
            _endReached = false;
        }

        protected internal override void OnRenderGraph()
        {
            if (_graphController != null && _graphController.dataSeriesCollection.Count > 0 && _graphController.TotalPoints > 0 && _width > 1 && _height > 1)
            {
                var pointsCollection = _graphController.GetAndClearAllPoints();
                int toIncrease = pointsCollection[0].Count;

                if (!_isPaused)
                {
                    for (int i = 0; i < pointsCollection.Count; i++)
                    {
                        var points = pointsCollection[i];

                        int polyReplaceIndex = _currentReplaceIndex;

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

                            if (_graphPolygons[i].Count > _maxPoints)
                            {
                                _graphPolygons[i].Replace(value, polyReplaceIndex++);
                            }
                            else
                            {
                                _graphPolygons[i].Add(value);
                            }

                            if (polyReplaceIndex > _graphPolygons[i].Count - 1)
                            {
                                polyReplaceIndex = 0;
                            }
                        }
                    }

                    if (_graphPolygons[0].Count > _maxPoints)
                    {
                        if (_endReached)
                        {
                            _currentReplaceIndex += toIncrease;
                        }
                        else
                        {
                            _currentReplaceIndex = 0;
                            _endReached = true;
                        }
                    }

                    if (_currentReplaceIndex > _graphPolygons[0].Count - 1)
                    {
                        _currentReplaceIndex = 0;
                    }
                }
            }

            updateCounter++;

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

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

        protected override void OnDrawVisuals()
        {
            if (_graphPolygons[0].Count > 0)
            {

                double markerPosition = 0;
                if (_currentReplaceIndex > 0)
                {
                    markerPosition = (((_currentReplaceIndex - 1) * (_width / (_graphPolygons[0].Count - 1)) + _offSetX));
                }

                List<SharpDX.Vector2[]> polygonPoints = new List<SharpDX.Vector2[]>();
                List<SharpDX.Vector2[]> polygonPointsFill = new List<SharpDX.Vector2[]>();
                List<Brush> strokes = new List<Brush>();
                List<Brush> fills = new List<Brush>();

                for (int i = 0; i < _graphPolygons.Count; i++)
                {
                    var polygon = _graphPolygons[i];
                    double scale = _width / (polygon.Count - 1);

                    if (polygon.Count > 0 && _graphController.dataSeriesCollection[i].isVisible)
                    {
                        Brush stroke = _graphController.dataSeriesCollection[i].stroke != null ? _graphController.dataSeriesCollection[i].stroke : _stroke;
                        Brush fill = _graphController.dataSeriesCollection[i].fill != null ? _graphController.dataSeriesCollection[i].fill : _fill;

                        strokes.Add(stroke);
                        fills.Add(fill);

                        polygonPoints.Add(polygon.ToDXPolygonPoints(_offSetX, _offSetY, scale, ConvertYToImageYFliped));
                        polygonPointsFill.Add(polygon.ToDXPolygonPointsFill(_offSetX, _offSetY, _mainWidth, _mainHeight, scale, ConvertYToImageYFliped));
                    }
                }

                (dxGraph as DXGraphSurfaceMultiErase).SetProperties(
                 polygonPoints,
                 _fillGraph ? polygonPointsFill : null,
                 strokes,
                 _strokeWidth,
                 _fillGraph,
                 fills,
                 _antialiased,
                 _markerBrush,
                 markerPosition,
                 _showMarker,
                 _markerStrokeWidth);

                dxGraph.EnableRendering();
            }
        }

        #endregion
    }
}