using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Data;
using Tango.BL.Entities;
using pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
namespace RealTimeGraphEx.DX2D
{
    using SharpDX;
    using SharpDX.Direct2D1;
    using SharpDX.Direct3D10;
    using SharpDX.DXGI;
    using System;
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Threading;
    using System.Windows;
    using Device = SharpDX.Direct3D10.Device1;
    using FeatureLevel = SharpDX.Direct3D10.FeatureLevel;

    public abstract class Direct2DControl : System.Windows.Controls.Image
    {
        private Device Device;
        private Texture2D RenderTarget;
        private DX10ImageSource D3DSurface;
        private readonly Stopwatch RenderTimer;
        private RenderTarget m_d2dRenderTarget;
        protected SharpDX.Direct2D1.Factory m_d2dFactory;
        private bool enableRendering;
        //private Stopwatch renderWatch;

        //public int FrameRate { get; set; }

        public Direct2DControl()
        {
            //renderWatch = new Stopwatch();
            //FrameRate = 60;
            this.RenderTimer = new Stopwatch();
            this.Loaded += this.Window_Loaded;
            this.Unloaded += this.Window_Closing;
            this.Stretch = System.Windows.Media.Stretch.Fill;
        }

        public void EnableRendering()
        {
            enableRendering = true;
        }

        public void DisableRendering()
        {
            enableRendering = false;
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            if (Direct2DControl.IsInDesignMode)
            {
                return;
            }

            this.StartD3D();
            this.StartRendering();
        }

        private void Window_Closing(object sender, RoutedEventArgs e)
        {
            if (Direct2DControl.IsInDesignMode)
            {
                return;
            }

            this.StopRendering();
            this.EndD3D();
        }

        private void StartD3D()
        {
            this.Device = new Device(DriverType.Hardware, DeviceCreationFlags.BgraSupport, FeatureLevel.Level_10_0);

            this.D3DSurface = new DX10ImageSource();
            this.D3DSurface.IsFrontBufferAvailableChanged += OnIsFrontBufferAvailableChanged;

            this.CreateAndBindTargets();

            this.Source = this.D3DSurface;
        }

        private void EndD3D()
        {
            this.D3DSurface.IsFrontBufferAvailableChanged -= OnIsFrontBufferAvailableChanged;
            this.Source = null;

            Disposer.SafeDispose(ref this.m_d2dRenderTarget);
            Disposer.SafeDispose(ref this.m_d2dFactory);
            Disposer.SafeDispose(ref this.D3DSurface);
            Disposer.SafeDispose(ref this.RenderTarget);
            Disposer.SafeDispose(ref this.Device);
        }

        private void CreateAndBindTargets()
        {
            if (this.D3DSurface == null) return;

            this.D3DSurface.SetRenderTargetDX10(null);

            Disposer.SafeDispose(ref this.m_d2dRenderTarget);
            Disposer.SafeDispose(ref this.m_d2dFactory);
            Disposer.SafeDispose(ref this.RenderTarget);

            var width = Math.Max((int)this.ActualWidth, 100);
            var height = Math.Max((int)this.ActualHeight, 100);

            var colordesc = new Texture2DDescription
            {
                BindFlags = BindFlags.RenderTarget | BindFlags.ShaderResource,
                Format = Format.B8G8R8A8_UNorm,
                Width = width,
                Height = height,
                MipLevels = 1,
                SampleDescription = new SampleDescription(1, 0),
                Usage = ResourceUsage.Default,
                OptionFlags = ResourceOptionFlags.Shared,
                CpuAccessFlags = CpuAccessFlags.None,
                ArraySize = 1
            };

            this.RenderTarget = new Texture2D(this.Device, colordesc);

            var surface = this.RenderTarget.QueryInterface<Surface>();

            m_d2dFactory = new SharpDX.Direct2D1.Factory();
            var rtp = new RenderTargetProperties(new PixelFormat(Format.Unknown, AlphaMode.Premultiplied));
            m_d2dRenderTarget = new RenderTarget(m_d2dFactory, surface, rtp);

            this.D3DSurface.SetRenderTargetDX10(this.RenderTarget);
        }

        private void StartRendering()
        {
            if (this.RenderTimer.IsRunning)
            {
                return;
            }

            System.Windows.Media.CompositionTarget.Rendering += OnRendering;
            this.RenderTimer.Start();
            //renderWatch.Start();
        }

        private void StopRendering()
        {
            if (!this.RenderTimer.IsRunning)
            {
                return;
            }

            System.Windows.Media.CompositionTarget.Rendering -= OnRendering;
            this.RenderTimer.Stop();
            RenderTimer.Stop();
        }

        private void OnRendering(object sender, EventArgs e)
        {
            if (!this.RenderTimer.IsRunning)
            {
                return;
            }

            //if (renderWatch.ElapsedMilliseconds >= (1000 / FrameRate))
            //{
            //renderWatch.Restart();
            if (enableRendering)
            {
                this.PrepareAndCallRender();
                this.D3DSurface.InvalidateD3DImage();
            }
            //}
        }

        protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
        {
            this.CreateAndBindTargets();
            base.OnRenderSizeChanged(sizeInfo);
        }

        private void PrepareAndCallRender()
        {
            var device = this.Device;
            if (device == null)
            {
                return;
            }

            var renderTarget = this.RenderTarget;
            if (renderTarget == null)
            {
                return;
            }

            var targetWidth = renderTarget.Description.Width;
            var targetHeight = renderTarget.Description.Height;

            device.Rasterizer.SetViewports(new Viewport(0, 0, targetWidth, targetHeight, 0.0f, 1.0f));


            // Does the actual rendering
            m_d2dRenderTarget.BeginDraw();
            this.Render(m_d2dRenderTarget);
            m_d2dRenderTarget.EndDraw();
            //this.ShowFramesPerSecondsOnDebug();

            device.Flush();
        }

        /// <summary>
        /// Does the actual rendering. 
        /// BeginDraw and EndDraw are already called by the caller. 
        /// </summary>
        public abstract void Render(RenderTarget target);

        /// <summary>
        /// Shows the number of frames per seconds on the debug line
        /// </summary>
        private void ShowFramesPerSecondsOnDebug()
        {
            // Spits out the Frames per second
            f++;
            if ((DateTime.Now - last).TotalSeconds > 1)
            {
                System.Diagnostics.Debug.WriteLine(f);
                f = 0;
                last = DateTime.Now;
            }
        }

        private DateTime last;
        private int f;

        private void OnIsFrontBufferAvailableChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            // this fires when the screensaver kicks in, the machine goes into sleep or hibernate
            // and any other catastrophic losses of the d3d device from WPF's point of view
            if (this.D3DSurface.IsFrontBufferAvailable)
            {
                this.StartRendering();
            }
            else
            {
                this.StopRendering();
            }
        }

        /// <summary>
        /// Gets f value indicating whether the control is in design mode
        /// (running in Blend or Visual Studio).
        /// </summary>
        public static bool IsInDesignMode
        {
            get
            {
                var prop = DesignerProperties.IsInDesignModeProperty;
                var isDesignMode = (bool)DependencyPropertyDescriptor.FromProperty(prop, typeof(FrameworkElement)).Metadata.DefaultValue;
                return isDesignMode;
            }
        }
    }
}