using RealTimeGraphEx.Controllers;
using RealTimeGraphEx.Models;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Windows.Threading;

namespace RealTimeGraphEx.ReachGraphs
{
    public class RealTimeGraphExReachLineScroll : RealTimeGraphExBase
    {
        #region Protected Fields

        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;

        #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(RealTimeGraphExReachLineScroll), new PropertyMetadata(Brushes.Black, 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(RealTimeGraphExReachLineScroll), new PropertyMetadata(null, new PropertyChangedCallback(CrossModelChanged)));

        /// <summary>
        /// Gets or sets the polygon used to render the graph.
        /// </summary>
        public Polygon Polygon
        {
            get { return (Polygon)GetValue(PolygonProperty); }
            set { SetValue(PolygonProperty, value); }
        }
        public static readonly DependencyProperty PolygonProperty =
            DependencyProperty.Register("Polygon", typeof(Polygon), typeof(RealTimeGraphExReachLineScroll), new PropertyMetadata(null, new PropertyChangedCallback(PolygonChanged)));
        private static void PolygonChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as RealTimeGraphExReachLineScroll;
            if (control.Polygon != null)
            {
                control.gridLinesAndImageWrapperGrid.Children.Remove(control.Polygon);
                control.gridLinesAndImageWrapperGrid.Children.Add(control.Polygon);
            }
        }

        /// <summary>
        /// Gets or sets the IDataSeries used to push data points 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(RealTimeGraphExReachLineScroll), new PropertyMetadata(null, new PropertyChangedCallback(GraphControllerChanged)));
        private static void GraphControllerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as RealTimeGraphExReachLineScroll;

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

        #endregion

        #region Constructors

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

        #endregion

        #region Override Methods

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

            if (Polygon == null)
            {
                Polygon = new System.Windows.Shapes.Polygon() { Tag = "Default" };
            }

            gridLinesAndImageWrapperGrid.Children.Remove(img);

            if (!gridLinesAndImageWrapperGrid.Children.Contains(Polygon))
            {
                gridLinesAndImageWrapperGrid.Children.Add(Polygon);
            }
        }

        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;
                _fill = Fill;

                if (Polygon.Tag != null && Polygon.Tag.ToString() == "Default")
                {
                    Polygon.Fill = Fill;
                    Polygon.Stroke = Stroke;
                }

                if (_graphController != null && _graphController.dataSeries != null && _graphController.dataSeries.useFillandStroke)
                {
                    Polygon.Fill = _graphController.dataSeries.fill;
                    Polygon.Stroke = _graphController.dataSeries.stroke;
                }

                if (this.GetType() == typeof(RealTimeGraphExReachLineScroll) || this.GetType() == typeof(RealTimeGraphExReachLineErase))
                {
                    Polygon.Margin = new Thickness(-2, 1, -2, 0);
                }

            }, DispatcherPriority.Send);
        }

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

            this.Dispatcher.Invoke(() =>
            {
                Polygon.Points.Clear();
            });
        }

        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];
                        graphPolygon.Add(value);

                        xValueCounter += _scaleFactor;
                    }

                    if (graphPolygon.Count > _maxPoints + 1)
                    {
                        xValueCounter -= (_scaleFactor * (graphPolygon.Count - (_maxPoints + 1)));
                        graphPolygon.RemoveFromStart(graphPolygon.Count - (_maxPoints + 1));
                    }
                }

                updateCounter++;

                if (updateCounter >= 1 && !_isPaused)
                {
                    updateCounter = 0;

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


        }

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

            if (IsPaused)
            {
                OnDrawVisuals();
            }
        }

        #endregion

        #region Virtual Methods

        /// <summary>
        /// Calculate the scaling factor for the current graph width.
        /// </summary>
        /// <returns></returns>
        protected virtual double GetPolygonScaleFactor()
        {
            return (_width + 3) / (graphPolygon.Count - 1);
        }

        /// <summary>
        /// Draw the actual polygon on the image.
        /// </summary>
        /// <param name="bmp"></param>
        protected virtual void OnDrawVisuals()
        {
            double scale = GetPolygonScaleFactor();

            this.Dispatcher.Invoke(() =>
            {
                Polygon.Points = new PointCollection(graphPolygon.ToReachPolygonPointsFill(_width, _height, scale, ConvertYToImageYFliped));
            }, DispatcherPriority.Send);
        }
        #endregion
    }
}