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

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

        protected Direct2DControl dxGraph;
        protected List<ConcurrentpointsList> _graphPolygons;
        protected Brush _stroke;
        protected Brush _fill;
        protected bool _fillGraph;
        protected double _strokeWidth;

        #endregion

        #region Constructors

        public RealTimeGraphExDirectXMultiLineScroll()
            : base()
        {
            _graphPolygons = new List<ConcurrentpointsList>();
            _graphController = new GraphMultiController();
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets or sets the graph strokes color.
        /// </summary>
        public Brush Stroke
        {
            get { return (Brush)GetValue(StrokeProperty); }
            set { SetValue(StrokeProperty, value); }
        }
        public static readonly DependencyProperty StrokeProperty =
            DependencyProperty.Register("Stroke", typeof(Brush), typeof(RealTimeGraphExDirectXMultiLineScroll), new PropertyMetadata(Brushes.Red, new PropertyChangedCallback(CrossModelChanged)));

        /// <summary>
        /// Gets or sets the graph fill color.
        /// </summary>
        public Brush Fill
        {
            get { return (Brush)GetValue(FillProperty); }
            set { SetValue(FillProperty, value); }
        }
        public static readonly DependencyProperty FillProperty =
            DependencyProperty.Register("Fill", typeof(Brush), typeof(RealTimeGraphExDirectXMultiLineScroll), new PropertyMetadata(Brushes.Transparent, new PropertyChangedCallback(CrossModelChanged)));

        /// <summary>
        /// Gets or sets whether the graph will be rendered using the Fill color property.
        /// </summary>
        public bool FillGraph
        {
            get { return (bool)GetValue(FillGraphProperty); }
            set { SetValue(FillGraphProperty, value); }
        }
        public static readonly DependencyProperty FillGraphProperty =
            DependencyProperty.Register("FillGraph", typeof(bool), typeof(RealTimeGraphExDirectXMultiLineScroll), new PropertyMetadata(false, new PropertyChangedCallback(CrossModelChanged)));

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


        #endregion

        #region Override Methods

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

            dxGraph = new DXGraphSurfaceMultiScroll() { 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 OnControllerChanged()
        {
            if (_graphController != null)
            {
                _graphController.RegisterMethods(ClearGraph, StartPushThread, SetPaused, ChangeRenderMode, null);

                foreach (var dataSeries in _graphController.DataSeriesCollection)
                {
                    _graphPolygons.Add(new ConcurrentpointsList());
                }
            }
        }

        protected override void OnSizeChanged(object sender, SizeChangedEventArgs e)
        {
            OnSetCrossThreadFields();
        }

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

            this.Dispatcher.Invoke(() =>
            {
                _maxPoints = MaxPoints;
                _scaleFactor = _width / _maxPoints;
                _strokeWidth = StrokeWidth;
                _fill = Fill;
                _stroke = Stroke;
                _fillGraph = FillGraph;

            }, System.Windows.Threading.DispatcherPriority.Send);
        }

        protected override void OnClearGraph()
        {
            _graphPolygons.ForEach(x => x.Clear());
            _graphController.ClearPoints();

            base.OnClearGraph();
        }

        protected override double ConvertYToImageY(double value)
        {
            double valuePrecentage = ((((value - (_minimum - (_strokeWidth / 2))) * 100) / (_maximum - (_minimum - (_strokeWidth / 2)))) * ((_height) - (_strokeWidth / 2))) / 100;
            return valuePrecentage;
        }

        protected override double ConvertYToImageYFliped(double value)
        {
            double valuePrecentage = ConvertYToImageY(value);
            valuePrecentage = (_height - (_strokeWidth / 2)) - valuePrecentage; //Flip
            return valuePrecentage;
        }

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

                if (!_isPaused)
                {

                    Parallel.For(0, pointsCollection.Count, (i) =>
                    {

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

                            _graphPolygons[i].Add(value);
                        }
                    });

                    if (_graphPolygons[0].Count > _maxPoints + _graphController.dataSeriesCollection[0].Points.Count)
                    {
                        Parallel.ForEach(_graphPolygons, (polygon) =>
                        {
                            polygon.RemoveFromStart(polygon.Count - (_maxPoints + _graphController.dataSeriesCollection[0].Points.Count));
                        });
                    }
                }
            }

            updateCounter++;

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

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

        protected override void OnDragging(System.Windows.Controls.Primitives.DragDeltaEventArgs e)
        {
            base.OnDragging(e);
        }

        #endregion

        #region Virtual Methods

        protected virtual void OnDrawVisuals()
        {
            if (_graphPolygons[0].Count > 0)
            {
                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 DXGraphSurfaceMultiScroll).SetProperties(
                 polygonPoints,
                 _fillGraph ? polygonPointsFill : null,
                 strokes,
                 _strokeWidth,
                 _fillGraph,
                 fills,
                 _antialiased);

                dxGraph.EnableRendering();
            }
        }

        public virtual List<double> GetCurrentPointsOnGraph(int seriesIndex)
        {
            return _graphPolygons[seriesIndex].GetPoints();
        }

        #endregion

    }
}