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 RealTimeGraphExDirectXLineScroll : RealTimeGraphExBase
    {

        #region Protected Fields

        protected Direct2DControl dxGraph;
        protected ConcurrentpointsList graphPolygon;
        protected int updateCounter;

        #endregion

        #region Cross Thread Fields

        protected GraphController _graphController;
        protected int _maxPoints;
        protected double _scaleFactor;
        protected Brush _stroke;
        protected Brush _fill;
        protected bool _fillGraph;
        protected double _strokeWidth;

        #endregion

        #region Properties


        /// <summary>
        /// Gets or sets the graph fill 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(RealTimeGraphExDirectXLineScroll), new PropertyMetadata(Brushes.Black, 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(RealTimeGraphExDirectXLineScroll), new PropertyMetadata(1.0, 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(RealTimeGraphExDirectXLineScroll), new PropertyMetadata(Brushes.Gray, 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(RealTimeGraphExDirectXLineScroll), new PropertyMetadata(false, new PropertyChangedCallback(CrossModelChanged)));


        /// <summary>
        /// Gets or sets the IDataSeries used to push data vectorsCollection to the graph.
        /// </summary>
        public GraphController Controller
        {
            get { return (GraphController)GetValue(ControllerProperty); }
            set { SetValue(ControllerProperty, value); }
        }
        public static readonly DependencyProperty ControllerProperty =
            DependencyProperty.Register("Controller", typeof(GraphController), typeof(RealTimeGraphExDirectXLineScroll), new PropertyMetadata(null, new PropertyChangedCallback(GraphControllerChanged)));
        private static void GraphControllerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as RealTimeGraphExDirectXLineScroll;

            if (control.Controller != null)
            {
                control.Controller.RegisterMethods(control.ClearGraph, control.StartPushThread, control.SetPaused, control.ChangeRenderMode,null);
                control._graphController = control.Controller;
            }
        }

        #endregion

        #region Constructor

        public RealTimeGraphExDirectXLineScroll()
            : base()
        {
            graphPolygon = new ConcurrentpointsList();
        }

        #endregion

        #region Override Methods

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

            dxGraph = new DXGraphSurfaceSingleScroll() { 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 OnSizeChanged(object sender, SizeChangedEventArgs e)
        {
            OnSetCrossThreadFields();
        }

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

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

            }, DispatcherPriority.Send);
        }

        protected override void OnClearGraph()
        {
            base.OnClearGraph();
            _graphController.dataSeries.ClearPoints();
            graphPolygon.Clear();
        }

        protected override void OnZoomingComplete(Point transformOrigin, double scaleX, double scaleY)
        {
            base.OnZoomingComplete(transformOrigin, scaleX, scaleY);
        }

        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.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);
                        graphPolygon.Add(value);
                    }

                    if (graphPolygon.Count > _maxPoints + 1)
                    {
                        graphPolygon.RemoveFromStart(graphPolygon.Count - (_maxPoints + 1));
                    }
                }
            }

            updateCounter++;

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

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

        #endregion

        #region Virtual Methods

        /// <summary>
        /// Calculate the scaling factor for the current graph width.
        /// </summary>
        /// <returns></returns>
        protected virtual double GetPolygonScaleFactor()
        {
            return _width / (graphPolygon.Count - 1);
        }

        protected virtual void OnDrawVisuals()
        {
            if (graphPolygon.Count > 0)
            {
                Brush stroke = _graphController.dataSeries.stroke != null ? _graphController.dataSeries.stroke : _stroke;
                Brush fill = _graphController.dataSeries.fill != null ? _graphController.dataSeries.fill : _fill;
                (dxGraph as DXGraphSurfaceSingleScroll).SetProperties(
                    graphPolygon.ToDXPolygonPoints(_offSetX, _offSetY, GetPolygonScaleFactor(), ConvertYToImageYFliped),
                    _fillGraph ? graphPolygon.ToDXPolygonPointsFill(_offSetX, _offSetY, _mainWidth, _mainHeight, GetPolygonScaleFactor(),
                    ConvertYToImageYFliped) : null,
                    stroke,
                    _strokeWidth,
                    _fillGraph,
                    fill,
                    _antialiased);

                dxGraph.EnableRendering();
            }
        }

        #endregion
    }
}