using System.Linq;
using RealTimeGraphEx.ExtensionMethods;

namespace RealTimeGraphEx.DX2D
{
    using SharpDX;
    using SharpDX.Direct2D1;
    using System;
    using System.Collections.Generic;
    using System.Threading;

    public class DXGraphSurfaceMultiScroll : Direct2DControl
    {
        private List<Vector2[]> lastPoints;
        private List<Vector2[]> lastPointsFill;
        private List<System.Windows.Media.Brush> _fill;
        private List<System.Windows.Media.Brush> _stroke;
        private double _strokeWidth;
        private bool _fillGraph;
        private bool _antialiazed;
        private bool updated;

        public DXGraphSurfaceMultiScroll()
        {
            lastPoints = new List<Vector2[]>();
            lastPointsFill = new List<Vector2[]>();
        }

        public void SetProperties(List<Vector2[]> polygonPoints, List<Vector2[]> polygonPointsFill, List<System.Windows.Media.Brush> stroke, double strokeWidth, bool fillGraph, List<System.Windows.Media.Brush> fill, bool antialized)
        {
            _stroke = stroke;
            _fill = fill;
            _fillGraph = fillGraph;
            _strokeWidth = strokeWidth;
            _antialiazed = antialized;


            lock (lastPoints)
            {
                lastPoints = polygonPoints;
                lastPointsFill = polygonPointsFill;
                updated = true;
            }
        }

        /// <summary>
        /// Does the actual rendering. 
        /// BeginDraw and EndDraw are already called by the caller. 
        /// </summary>
        public override void Render(RenderTarget target)
        {
            if (lastPoints.Count > 0 && updated)
            {
                lock (lastPoints)
                {
                    target.AntialiasMode = _antialiazed ? AntialiasMode.PerPrimitive : AntialiasMode.Aliased;

                    if (lastPoints.Count > 0 && lastPoints[0].Length > 0)
                    {
                        target.Clear(Color.Transparent);
                    }

                    for (int i = 0; i < lastPoints.Count; i++)
                    {

                        var stroke = _stroke[i].ToDxBrush(target);
                        var fill = _fill[i].ToDxBrush(target);

                        target.DrawPolygon(m_d2dFactory, stroke, _strokeWidth, lastPoints[i]);

                        if (_fillGraph && fill != null && _fill[i] != null)
                        {
                            target.FillPolygon(m_d2dFactory, fill, lastPointsFill[i]);
                        }
                    }

                    updated = false;
                    GC.Collect(GC.MaxGeneration, GCCollectionMode.Optimized, blocking: false);
                }
            }

            DisableRendering();
        }
    }
}