using System.Linq;
using RealTimeGraphEx.ExtensionMethods;

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

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

        public DXGraphSurfaceSingleScroll()
        {
            lastPoints = new Vector2[0];
            lastPointsFill = new Vector2[0];
        }

        public void SetProperties(Vector2[] polygonPoints, Vector2[] polygonPointsFill, System.Windows.Media.Brush stroke, double strokeWidth, bool fillGraph, 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.Length > 0 && updated)
            {
                target.Clear(Color.Transparent);
                var stroke = _stroke.ToDxBrush(target);
                var fill = _fill.ToDxBrush(target);

                target.AntialiasMode = _antialiazed ? AntialiasMode.PerPrimitive : AntialiasMode.Aliased;

                lock (lastPoints)
                {
                    target.DrawPolygon(m_d2dFactory, stroke, _strokeWidth, lastPoints);

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

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

            DisableRendering();
        }
    }
}