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 RealTimeGraphEx.Models;
using RealTimeGraphEx.Enums;

namespace RealTimeGraphEx.FastGraphs
{
    public class RealTimeGraphExShapeErase : RealTimeGraphExShapeScroll
    {
        #region Cross Thread Fields

        protected Color _markerColor;
        protected bool _showMarker;
        protected bool _endReached;
        protected int _currentReplaceIndex;

        #endregion

        #region Properties

        /// <summary>
        /// Gets or sets the graph marker color.
        /// </summary>
        public Color MarkerColor
        {
            get { return (Color)GetValue(MarkerColorProperty); }
            set { SetValue(MarkerColorProperty, value); }
        }
        public static readonly DependencyProperty MarkerColorProperty =
            DependencyProperty.Register("MarkerBrush", typeof(Color), typeof(RealTimeGraphExShapeErase), new PropertyMetadata(Colors.Red, new PropertyChangedCallback(CrossModelChanged)));

        /// <summary>
        /// Gets or sets whether to display the marker on the graph.
        /// </summary>
        public bool ShowMarker
        {
            get { return (bool)GetValue(ShowMarkerProperty); }
            set { SetValue(ShowMarkerProperty, value); }
        }
        public static readonly DependencyProperty ShowMarkerProperty =
            DependencyProperty.Register("ShowMarker", typeof(bool), typeof(RealTimeGraphExShapeErase), new PropertyMetadata(true, new PropertyChangedCallback(CrossModelChanged)));

        #endregion

        #region Constructors

        public RealTimeGraphExShapeErase()
            : base()
        {
           
        }

        #endregion

        #region Override Method

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

            this.Dispatcher.Invoke(() =>
            {
                _markerColor = MarkerColor;
                _showMarker = ShowMarker;

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

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

            _currentReplaceIndex = 0;
            _endReached = false;
        }

        protected internal override void OnRenderGraph()
        {
            if (_graphController != null && _graphController.dataSeries.Points != null && _graphController.dataSeries.Points.Count > 0  && _width > 1 && _height > 1)
            {
                for (int i = 0; i < _graphController.dataSeries.Points.Count; i++)
                {
                    double value = _graphController.dataSeries.Points[i];
                    NormalizeValue(ref value);
                    double valuePrecentage = ConvertYToImageYFliped(value);

                    if (xValueCounter <= _width)
                    {
                        if (!_endReached)
                        {
                            graphColumns.Add((int)xValueCounter, (int)valuePrecentage, (int)xValueCounter + _shapeWidth, (int)(_maximum - valuePrecentage), (int)value);
                            xValueCounter += (_shapeWidth + _shapeGap + 1);
                            currentColumnIndex = graphColumns.TotalColumns - 1;
                        }
                        else
                        {
                            currentColumnIndex = _currentReplaceIndex;
                            graphColumns.Replace((int)xValueCounter, (int)valuePrecentage, (int)xValueCounter + _shapeWidth, (int)(_maximum - valuePrecentage), (int)value, _currentReplaceIndex++);
                            xValueCounter += (_shapeWidth + _shapeGap + 1);

                            if (xValueCounter > _width)
                            {
                                xValueCounter = 0;
                                _currentReplaceIndex = 0;
                            }
                        }
                    }
                    else
                    {
                        _endReached = true;
                        xValueCounter = 0;
                        currentColumnIndex = 0;
                        currentColumnIndex = currentColumnIndex = graphColumns.TotalColumns - 1;
                        graphColumns.Replace((int)xValueCounter, (int)valuePrecentage, (int)xValueCounter + _shapeWidth, (int)(_maximum - valuePrecentage), (int)value, _currentReplaceIndex++);
                        xValueCounter += (_shapeWidth + _shapeGap + 1);
                    }
                }

                updateCounter++;

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

                    if (!_disableRendering)
                    {
                        WriteableBitmap bmp = BitmapFactory.New((int)_width, (int)_height);
                        bmp.Clear(Colors.Transparent);

                        Color lineColor = _graphController.dataSeries.GetStrokeColor() != null ? _graphController.dataSeries.GetStrokeColor().Value : _stroke;
                        Color fillColor = _graphController.dataSeries.GetFillColor() != null ? _graphController.dataSeries.GetFillColor().Value : _fill;

                        int right = graphColumns.TotalColumns - currentColumnIndex;
                        double r_opacity = right > 0 ? 255 / right : 255;
                        double l_opacity = currentColumnIndex > 0 ? 255 / currentColumnIndex : 255;

                        for (int i = 0; i < graphColumns.TotalColumns; i++)
                        {
                            var rec = graphColumns.Columns[i];
                            Color processedLineColor = lineColor;
                            Color processedFillColor = fillColor;

                            switch (_shapeType)
                            {
                                case ShapeTypeEnum.Column:
                                    #region Column

                                    int calculatedOpacity = 255;
                                    if (_opacityAnimationType == OpacityTypeEnum.FadeOut)
                                    {
                                        byte opacity = (byte)((((rec.X) * 100 / _width) * 255) / 100);
                                        processedLineColor.A = opacity;
                                        processedFillColor.A = opacity;
                                    }
                                    else if (_opacityAnimationType == OpacityTypeEnum.CrossFade)
                                    {
                                        if (i < currentColumnIndex && currentColumnIndex > 0)
                                        {
                                            calculatedOpacity = (int)((i + 1) * l_opacity);
                                        }
                                        else
                                        {
                                            calculatedOpacity = (int)(((right) - Math.Abs(currentColumnIndex - (i))) * r_opacity);
                                        }

                                        byte opacity = (byte)(calculatedOpacity);

                                        processedLineColor.A = opacity;
                                        processedFillColor.A = opacity;
                                    }

                                    if (_fillGraph)
                                    {
                                        bmp.FillRectangle(rec.X, rec.Y, rec.Right, rec.Bottom, processedFillColor);
                                        bmp.DrawRectangle(rec.X, rec.Y, rec.Right, rec.Bottom, processedLineColor);
                                    }
                                    else
                                    {
                                        bmp.DrawRectangle(rec.X, rec.Y, rec.Right, rec.Bottom, processedLineColor);
                                    }
                                    #endregion
                                    break;
                                case ShapeTypeEnum.Circle:
                                    #region Circle
                                    calculatedOpacity = 255;

                                    if (_opacityAnimationType == OpacityTypeEnum.FadeOut)
                                    {
                                        byte opacity = (byte)((((rec.X) * 100 / _width) * 255) / 100);
                                        processedLineColor.A = opacity;
                                        processedFillColor.A = opacity;
                                    }
                                    else if (_opacityAnimationType == OpacityTypeEnum.CrossFade)
                                    {
                                        if (i < currentColumnIndex && currentColumnIndex > 0)
                                        {
                                            calculatedOpacity = (int)((i + 1) * l_opacity);
                                        }
                                        else
                                        {
                                            calculatedOpacity = (int)(((right) - Math.Abs(currentColumnIndex - (i))) * r_opacity);
                                        }

                                        byte opacity = (byte)(calculatedOpacity);

                                        processedLineColor.A = opacity;
                                        processedFillColor.A = opacity;
                                    }

                                    if (_fillGraph)
                                    {
                                        bmp.FillEllipseCentered(rec.X, rec.Y, _shapeWidth, _shapeWidth, processedFillColor);
                                        bmp.DrawEllipseCentered(rec.X, rec.Y, _shapeWidth, _shapeWidth, processedLineColor);
                                    }
                                    else
                                    {
                                        bmp.DrawEllipseCentered(rec.X, rec.Y, _shapeWidth, _shapeWidth, processedLineColor);
                                    }
                                    #endregion
                                    break;
                                case ShapeTypeEnum.Rectangle:
                                    #region Rectangle
                                    calculatedOpacity = 255;

                                    if (_opacityAnimationType == OpacityTypeEnum.FadeOut)
                                    {
                                        byte opacity = (byte)((((rec.X) * 100 / _width) * 255) / 100);
                                        processedLineColor.A = opacity;
                                        processedFillColor.A = opacity;
                                    }
                                    else if (_opacityAnimationType == OpacityTypeEnum.CrossFade)
                                    {
                                        if (i < currentColumnIndex && currentColumnIndex > 0)
                                        {
                                            calculatedOpacity = (int)((i + 1) * l_opacity);
                                        }
                                        else
                                        {
                                            calculatedOpacity = (int)(((right) - Math.Abs(currentColumnIndex - (i))) * r_opacity);
                                        }

                                        byte opacity = (byte)(calculatedOpacity);

                                        processedLineColor.A = opacity;
                                        processedFillColor.A = opacity;
                                    }

                                    if (_fillGraph)
                                    {
                                        bmp.FillRectangle(rec.X, rec.Y, rec.X + _shapeWidth, rec.Y + _shapeWidth, processedFillColor);
                                        bmp.DrawRectangle(rec.X, rec.Y, rec.X + _shapeWidth, rec.Y + _shapeWidth, processedLineColor);
                                    }
                                    else
                                    {
                                        bmp.DrawRectangle(rec.X, rec.Y, rec.X + _shapeWidth, rec.Y + _shapeWidth, processedLineColor);
                                    }
                                    #endregion
                                    break;
                            }

                        }

                        if (_showMarker)
                        {
                            bmp.DrawLine((int)(xValueCounter), 0, (int)(xValueCounter), (int)_height, _markerColor);
                        }

                        bmp.Freeze();

                        img.Dispatcher.BeginInvoke(new Action(() =>
                        {
                            img.Source = bmp;
                        }), System.Windows.Threading.DispatcherPriority.Send);
                    }
                }
            }
        }

        #endregion
    }
}