#region Using Statements
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ANX.Framework.NonXNA;
using ANX.Framework.Graphics;
using System.Runtime.InteropServices;

#endregion // Using Statements

#region License

//
// This file is part of the ANX.Framework created by the "ANX.Framework developer group".
//
// This file is released under the Ms-PL license.
//
//
//
// Microsoft Public License (Ms-PL)
//
// This license governs use of the accompanying software. If you use the software, you accept this license. 
// If you do not accept the license, do not use the software.
//
// 1.Definitions
//   The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning 
//   here as under U.S. copyright law.
//   A "contribution" is the original software, or any additions or changes to the software.
//   A "contributor" is any person that distributes its contribution under this license.
//   "Licensed patents" are a contributor's patent claims that read directly on its contribution.
//
// 2.Grant of Rights
//   (A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations 
//       in section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to 
//       reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution
//       or any derivative works that you create.
//   (B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in 
//       section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed
//       patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution 
//       in the software or derivative works of the contribution in the software.
//
// 3.Conditions and Limitations
//   (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or trademarks.
//   (B) If you bring a patent claim against any contributor over patents that you claim are infringed by the software, your 
//       patent license from such contributor to the software ends automatically.
//   (C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and attribution 
//       notices that are present in the software.
//   (D) If you distribute any portion of the software in source code form, you may do so only under this license by including
//       a complete copy of this license with your distribution. If you distribute any portion of the software in compiled or 
//       object code form, you may only do so under a license that complies with this license.
//   (E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express warranties, guarantees,
//       or conditions. You may have additional consumer rights under your local laws which this license cannot change. To the
//       extent permitted under your local laws, the contributors exclude the implied warranties of merchantability, fitness for a 
//       particular purpose and non-infringement.

#endregion // License

namespace ANX.Framework.Graphics
{
    public class GraphicsDevice : IDisposable
    {
        #region Private Members
        private INativeGraphicsDevice nativeDevice;
        private IndexBuffer indexBuffer;
        private SamplerStateCollection samplerStateCollection;
        private Viewport viewport;
        private BlendState blendState;
        private RasterizerState rasterizerState;
        private DepthStencilState depthStencilState;
        private GraphicsAdapter currentAdapter;
        private PresentationParameters currentPresentationParameters;
        private bool isDisposed;
        private GraphicsProfile graphicsProfile;
        private VertexBufferBinding[] currentVertexBufferBindings;
        private RenderTargetBinding[] currentRenderTargetBindings;
        private TextureCollection vertexTextureCollection;
        private TextureCollection textureCollection;

        #endregion // Private Members

        #region Events
        public event EventHandler<EventArgs> Disposing;
        public event EventHandler<ResourceDestroyedEventArgs> ResourceDestroyed;
        public event EventHandler<ResourceCreatedEventArgs> ResourceCreated;
        public event EventHandler<EventArgs> DeviceLost;
        public event EventHandler<EventArgs> DeviceReset;
        public event EventHandler<EventArgs> DeviceResetting;

        #endregion // Events

        #region Constructor & Destructor
        public GraphicsDevice(GraphicsAdapter adapter, GraphicsProfile graphicsProfile, PresentationParameters presentationParameters)
        {
            this.currentAdapter = adapter;
            this.graphicsProfile = graphicsProfile;
            this.currentPresentationParameters = presentationParameters;

            this.viewport = new Viewport(0, 0, presentationParameters.BackBufferWidth, presentationParameters.BackBufferHeight);

            nativeDevice = AddInSystemFactory.Instance.GetCurrentCreator<IRenderSystemCreator>().CreateGraphicsDevice(presentationParameters);

            this.samplerStateCollection = new SamplerStateCollection(this, 8);    //TODO: get maximum number of sampler states from capabilities
            this.textureCollection = new TextureCollection();
            this.vertexTextureCollection = new TextureCollection();
        }

        ~GraphicsDevice()
        {
            this.Dispose(false);
        }

        #endregion // Constructor & Destructor

        #region Clear
        public void Clear(Color color)
        {
            nativeDevice.Clear(ref color);
        }

        public void Clear(ClearOptions options, Color color, float depth, int stencil)
        {
            Clear(options, color.ToVector4(), depth, stencil);
        }

        public void Clear(ClearOptions options, Vector4 color, float depth, int stencil)
        {
            nativeDevice.Clear(options, color, depth, stencil);
        }

        #endregion // Clear

        #region Present
        public void Present()
        {
            nativeDevice.Present();
        }

        public void Present(Nullable<Rectangle> sourceRectangle, Nullable<Rectangle> destinationRectangle, IntPtr overrideWindowHandle)
        {
            throw new NotImplementedException();
        }

        #endregion // Present

        #region DrawPrimitives & DrawIndexedPrimitives
        public void DrawIndexedPrimitives(PrimitiveType primitiveType, int baseVertex, int minVertexIndex, int numVertices, int startIndex, int primitiveCount)
        {
            nativeDevice.DrawIndexedPrimitives(primitiveType, baseVertex, minVertexIndex, numVertices, startIndex, primitiveCount);
        }

        public void DrawPrimitives(PrimitiveType primitiveType, int startVertex, int primitiveCount)
        {
            nativeDevice.DrawPrimitives(primitiveType, startVertex, primitiveCount);
        }

        #endregion // DrawPrimitives & DrawIndexedPrimitives

        #region DrawInstancedPrimitives
        public void DrawInstancedPrimitives(PrimitiveType primitiveType, int baseVertex, int minVertexIndex, int numVertices, int startIndex, int primitiveCount, int instanceCount)
        {
            nativeDevice.DrawInstancedPrimitives(primitiveType, baseVertex, minVertexIndex, numVertices, startIndex, primitiveCount, instanceCount);
        }

        #endregion // DrawInstancedPrimitives

        #region DrawUserIndexedPrimitives<T>
        public void DrawUserIndexedPrimitives<T>(PrimitiveType primitiveType, T[] vertexData, int vertexOffset, int numVertices, short[] indexData, int indexOffset, int primitiveCount) where T : struct, IVertexType
        {
            //TODO: cache the instances to avoid reflection overhead
            IVertexType vertexType = Activator.CreateInstance<T>();
            VertexDeclaration vertexDeclaration = vertexType.VertexDeclaration;

            nativeDevice.DrawUserIndexedPrimitives<T>(primitiveType, vertexData, vertexOffset, numVertices, indexData, indexOffset, primitiveCount, vertexDeclaration, IndexElementSize.SixteenBits);
        }

        public void DrawUserIndexedPrimitives<T>(PrimitiveType primitiveType, T[] vertexData, int vertexOffset, int numVertices, short[] indexData, int indexOffset, int primitiveCount, VertexDeclaration vertexDeclaration) where T : struct, IVertexType
        {
            nativeDevice.DrawUserIndexedPrimitives<T>(primitiveType, vertexData, vertexOffset, numVertices, indexData, indexOffset, primitiveCount, vertexDeclaration, IndexElementSize.SixteenBits);
        }

        public void DrawUserIndexedPrimitives<T>(PrimitiveType primitiveType, T[] vertexData, int vertexOffset, int numVertices, int[] indexData, int indexOffset, int primitiveCount) where T : struct, IVertexType
        {
            //TODO: cache the instances to avoid reflection overhead
            IVertexType vertexType = Activator.CreateInstance<T>();
            VertexDeclaration vertexDeclaration = vertexType.VertexDeclaration;

            nativeDevice.DrawUserIndexedPrimitives<T>(primitiveType, vertexData, vertexOffset, numVertices, indexData, indexOffset, primitiveCount, vertexDeclaration, IndexElementSize.ThirtyTwoBits);
        }

        public void DrawUserIndexedPrimitives<T>(PrimitiveType primitiveType, T[] vertexData, int vertexOffset, int numVertices, int[] indexData, int indexOffset, int primitiveCount, VertexDeclaration vertexDeclaration) where T : struct, IVertexType
        {
            nativeDevice.DrawUserIndexedPrimitives<T>(primitiveType, vertexData, vertexOffset, numVertices, indexData, indexOffset, primitiveCount, vertexDeclaration, IndexElementSize.ThirtyTwoBits);
        }

        #endregion // DrawUserIndexedPrimitives<T>

        #region DrawUserPrimitives<T>
        public void DrawUserPrimitives<T>(PrimitiveType primitiveType, T[] vertexData, int vertexOffset, int primitiveCount) where T : struct, IVertexType
        {
            //TODO: cache the instances to avoid reflection overhead
            IVertexType vertexType = Activator.CreateInstance<T>();
            VertexDeclaration vertexDeclaration = vertexType.VertexDeclaration;

            nativeDevice.DrawUserPrimitives<T>(primitiveType, vertexData, vertexOffset, primitiveCount, vertexDeclaration);
        }

        public void DrawUserPrimitives<T>(PrimitiveType primitiveType, T[] vertexData, int vertexOffset, int primitiveCount, VertexDeclaration vertexDeclaration) where T : struct, IVertexType
        {
            nativeDevice.DrawUserPrimitives<T>(primitiveType, vertexData, vertexOffset, primitiveCount, vertexDeclaration);
        }

        #endregion // DrawUserPrimitives<T>

        #region SetVertexBuffer
        public void SetVertexBuffer(VertexBuffer vertexBuffer)
        {
            VertexBufferBinding[] bindings = new VertexBufferBinding[] { new VertexBufferBinding(vertexBuffer) };
            this.currentVertexBufferBindings = bindings;
            this.nativeDevice.SetVertexBuffers(bindings);
        }

        public void SetVertexBuffer(VertexBuffer vertexBuffer, int vertexOffset)
        {
            VertexBufferBinding[] bindings = new VertexBufferBinding[] { new VertexBufferBinding(vertexBuffer, vertexOffset) };
            this.currentVertexBufferBindings = bindings;
            this.nativeDevice.SetVertexBuffers(bindings);
        }

        public void SetVertexBuffers(Graphics.VertexBufferBinding[] vertexBuffers)
        {
            this.currentVertexBufferBindings = vertexBuffers;
            nativeDevice.SetVertexBuffers(vertexBuffers);
        }

        #endregion // SetVertexBuffer

        #region SetRenderTarget
        public void SetRenderTarget(RenderTarget2D renderTarget)
        {
            RenderTargetBinding[] renderTargetBindings = new RenderTargetBinding[] { new RenderTargetBinding(renderTarget) };
            this.currentRenderTargetBindings = renderTargetBindings;
            nativeDevice.SetRenderTargets(renderTargetBindings);
        }

        public void SetRenderTarget(RenderTargetCube renderTarget, CubeMapFace cubeMapFace)
        {
            RenderTargetBinding[] renderTargetBindings = new RenderTargetBinding[] { new RenderTargetBinding(renderTarget, cubeMapFace) };
            this.currentRenderTargetBindings = renderTargetBindings;
            nativeDevice.SetRenderTargets(renderTargetBindings);
        }

        public void SetRenderTargets(params RenderTargetBinding[] renderTargets)
        {
            this.currentRenderTargetBindings = renderTargets;
            nativeDevice.SetRenderTargets(renderTargets);
        }

        #endregion // SetRenderTarget

        #region GetBackBufferData<T>
        public void GetBackBufferData<T>(Nullable<Rectangle> rect, T[] data, int startIndex, int elementCount) where T : struct
        {
            nativeDevice.GetBackBufferData<T>(rect, data, startIndex, elementCount);
        }

        public void GetBackBufferData<T>(T[] data) where T : struct
        {
            nativeDevice.GetBackBufferData<T>(data);
        }

        public void GetBackBufferData<T>(T[] data, int startIndex, int elementCount) where T : struct
        {
            nativeDevice.GetBackBufferData<T>(data, startIndex, elementCount);
        }

        #endregion // GetBackBufferData<T>

        public VertexBufferBinding[] GetVertexBuffers()
        {
            return this.currentVertexBufferBindings;
        }

        public RenderTargetBinding[] GetRenderTargets()
        {
            return this.currentRenderTargetBindings;
        }

        #region Reset
        public void Reset()
        {
            this.Reset(this.currentPresentationParameters, this.currentAdapter);
        }

        public void Reset(PresentationParameters presentationParameters)
        {
            this.Reset(presentationParameters, this.currentAdapter);
        }

        public void Reset(PresentationParameters presentationParameters, GraphicsAdapter adapter)
        {
            if (presentationParameters == null)
            {
                throw new ArgumentNullException("presentationParameters");
            }

            if (adapter == null)
            {
                throw new ArgumentNullException("adapter");
            }

            if (this.currentAdapter != adapter)
            {
                throw new InvalidOperationException("adapter switch not yet implemented");
            }

            raise_DeviceResetting(this, EventArgs.Empty);

            // reset presentation parameters
            nativeDevice.ResizeBuffers(presentationParameters); //TODO: check if necessary

            raise_DeviceReset(this, EventArgs.Empty);
        }

        #endregion // Reset

        public void Dispose()
        {
            throw new NotImplementedException();
        }

        protected virtual void Dispose(Boolean disposeManaged)
        {
            //TODO: implement
        }

        public INativeGraphicsDevice NativeDevice
        {
            get
            {
                return this.nativeDevice;
            }
        }

        public IndexBuffer Indices
        {
            get
            {
                return this.indexBuffer;
            }
            set
            {
                if (this.indexBuffer != value)
                {
                    this.indexBuffer = value;
                    NativeDevice.SetIndexBuffer(this.indexBuffer);
                }
            }
        }

        public Viewport Viewport
        {
            get
            {
                return this.viewport;
            }
            set
            {
                this.Viewport = value;
            }
        }

        public BlendState BlendState
        {
            get
            {
                return this.blendState;
            }
            set
            {
                if (this.blendState != value)
                {
                    if (this.blendState != null)
                    {
                        this.blendState.NativeBlendState.Release();
                    }

                    this.blendState = value;

                    this.blendState.NativeBlendState.Apply(this);
                }
            }
        }

        public DepthStencilState DepthStencilState
        {
            get
            {
                return this.depthStencilState;
            }
            set
            {
                if (this.depthStencilState != value)
                {
                    if (this.depthStencilState != null)
                    {
                        this.depthStencilState.NativeDepthStencilState.Release();
                    }

                    this.depthStencilState = value;

                    this.depthStencilState.NativeDepthStencilState.Apply(this);
                }
            }
        }

        public RasterizerState RasterizerState
        {
            get
            {
                return this.rasterizerState;
            }
            set
            {
                if (this.rasterizerState != value)
                {
                    if (this.rasterizerState != null)
                    {
                        this.rasterizerState.NativeRasterizerState.Release();
                    }

                    this.rasterizerState = value;

                    this.rasterizerState.NativeRasterizerState.Apply(this);
                }
            }
        }

        public SamplerStateCollection SamplerStates
        {
            get
            {
                return this.samplerStateCollection;
            }
        }

        public bool IsDisposed
        {
            get
            {
                return this.isDisposed;
            }
        }

        public Rectangle ScissorRectangle
        {
            get
            {
                throw new NotImplementedException();
            }
            set
            {
                throw new NotImplementedException();
            }
        }

        public DisplayMode DisplayMode
        {
            get
            {
                throw new NotImplementedException();
            }
        }

        public GraphicsDeviceStatus GraphicsDeviceStatus
        {
            get
            {
                throw new NotImplementedException();
            }
        }

        public GraphicsProfile GraphicsProfile
        {
            get
            {
                return this.graphicsProfile;
            }
        }

        public GraphicsAdapter Adapter
        {
            get
            {
                return this.currentAdapter;
            }
        }

        public PresentationParameters PresentationParameters
        {
            get
            {
                return this.currentPresentationParameters;
            }
        }

        public int ReferenceStencil
        {
            get
            {
                return DepthStencilState.ReferenceStencil;
            }
            set
            {
                if (DepthStencilState.ReferenceStencil != value)
                {
                    DepthStencilState.ReferenceStencil = value;
                }
            }
        }

        public int MultiSampleMask
        {
            get
            {
                return BlendState.MultiSampleMask;
            }
            set
            {
                if (BlendState.MultiSampleMask != value)
                {
                    BlendState.MultiSampleMask = value;
                }
            }
        }

        public Color BlendFactor
        {
            get
            {
                return BlendState.BlendFactor;
            }
            set
            {
                if (BlendState.BlendFactor != value)
                {
                    BlendState.BlendFactor = value;
                }
            }
        }

        public TextureCollection VertexTextures
        {
            get
            {
                return this.vertexTextureCollection;
            }
        }

        public TextureCollection Textures
        {
            get
            {
                return this.textureCollection;
            }
        }

        public SamplerStateCollection VertexSamplerStates
        {
            get
            {
                throw new NotImplementedException();
            }
        }

        protected void raise_Disposing(object sender, EventArgs args)
        {
            if (Disposing != null)
            {
                Disposing(sender, args);
            }
        }

        protected void raise_DeviceResetting(object sender, EventArgs args)
        {
            if (DeviceResetting != null)
            {
                DeviceResetting(sender, args);
            }
        }

        protected void raise_DeviceReset(object sender, EventArgs args)
        {
            if (DeviceReset != null)
            {
                DeviceReset(sender, args);
            }
        }

        protected void raise_DeviceLost(object sender, EventArgs args)
        {
            if (DeviceLost != null)
            {
                DeviceLost(sender, args);
            }
        }

        protected void raise_ResourceCreated(object sender, ResourceCreatedEventArgs args)
        {
            if (ResourceCreated != null)
            {
                ResourceCreated(sender, args);
            }
        }

        protected void raise_ResourceDestroyed(object sender, ResourceDestroyedEventArgs args)
        {
            if (ResourceDestroyed != null)
            {
                ResourceDestroyed(sender, args);
            }
        }
    }
}