using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Media.Imaging;
using SharpDX;
using SharpDX.Direct3D;
using SharpDX.DirectWrite;

using AlphaMode = SharpDX.Direct2D1.AlphaMode;
using Color = SharpDX.Color;
using FontStyle = SharpDX.DirectWrite.FontStyle;
using ImageBrush = Windows.UI.Xaml.Media.ImageBrush;
using Rectangle = Windows.UI.Xaml.Shapes.Rectangle;

namespace NovelReader
{
    public class DirectXCanvas
    {
        SharpDX.Direct3D11.Device1 d3dDevice;
        SharpDX.Direct2D1.Device d2dDevice;
        SharpDX.Direct2D1.DeviceContext d2dContext;
        SharpDX.Direct2D1.Factory1 d2dFactory;
        SharpDX.DirectWrite.Factory dwirteFactory;
        SurfaceImageSource surfaceImageSource;
        ImageBrush brush;
        SharpDX.Direct2D1.Brush colorBrush;
        Rectangle rect;
        TextFormat textFormat;

        public DirectXCanvas()
        {
        }

        public void Initialize(Rectangle rect)
        {
            this.rect = rect;

            // Create Factories
            this.d2dFactory = new SharpDX.Direct2D1.Factory1(SharpDX.Direct2D1.FactoryType.SingleThreaded, SharpDX.Direct2D1.DebugLevel.None);
            this.dwirteFactory = new Factory(FactoryType.Shared);

            // Create D3D Device
            var deviceCreationFlags = SharpDX.Direct3D11.DeviceCreationFlags.VideoSupport | SharpDX.Direct3D11.DeviceCreationFlags.BgraSupport;

            try
            {
                using(var defaultDevice = new SharpDX.Direct3D11.Device(DriverType.Hardware, deviceCreationFlags))
                {
                    this.d3dDevice = defaultDevice.QueryInterface<SharpDX.Direct3D11.Device1>();
                }
            }
            catch (Exception e)
            {
                deviceCreationFlags = SharpDX.Direct3D11.DeviceCreationFlags.BgraSupport;

                using (var defaultDevice = new SharpDX.Direct3D11.Device(DriverType.Hardware, deviceCreationFlags))
                {
                    this.d3dDevice = defaultDevice.QueryInterface<SharpDX.Direct3D11.Device1>();
                }
            }

            // Create Direct2D Device
            using (var dxgiDevice = d3dDevice.QueryInterface<SharpDX.DXGI.Device>())
            {
                d2dDevice = new SharpDX.Direct2D1.Device(d2dFactory, dxgiDevice);
            }

            // Create Direct2D context
            this.d2dContext = new SharpDX.Direct2D1.DeviceContext(this.d2dDevice, SharpDX.Direct2D1.DeviceContextOptions.None);

            // Create SurfaceImageSource
            this.surfaceImageSource = new SurfaceImageSource((int)rect.ActualWidth, (int)rect.ActualHeight);

            this.brush = new ImageBrush();
            this.brush.ImageSource = this.surfaceImageSource;
            rect.Fill = this.brush;

            using (SharpDX.DXGI.ISurfaceImageSourceNative surfaceImageSourceNative = ComObject.As<SharpDX.DXGI.ISurfaceImageSourceNative>(this.surfaceImageSource))
            {
                surfaceImageSourceNative.Device = d3dDevice.QueryInterface<SharpDX.DXGI.Device>();
            }

            // Create brush and text format
            this.colorBrush = new SharpDX.Direct2D1.SolidColorBrush(this.d2dContext, Color.White);
            this.textFormat = new TextFormat(this.dwirteFactory, "Calibri", 20);
        }

        public void Render()
        {
            DrawingPoint drawingPoint;
            SharpDX.Rectangle drawRect = new SharpDX.Rectangle(0, 0, (int)this.rect.ActualWidth, (int)this.rect.ActualHeight);

            using (SharpDX.DXGI.ISurfaceImageSourceNative surfaceImageSourceNative = ComObject.As<SharpDX.DXGI.ISurfaceImageSourceNative>(this.surfaceImageSource))
            using (SharpDX.DXGI.Surface surface = surfaceImageSourceNative.BeginDraw(drawRect, out drawingPoint))
            {
                d2dContext.BeginDraw();
                d2dContext.TextAntialiasMode = SharpDX.Direct2D1.TextAntialiasMode.Cleartype;
                d2dContext.Clear(Color.White);
                d2dContext.Transform = Matrix3x2.Identity;
                d2dContext.DrawText("Test Text", this.textFormat, new RectangleF(0, 0, 100, 100), this.colorBrush);
                d2dContext.EndDraw();

                surfaceImageSourceNative.EndDraw();
            }

        }
    }
}