#region License
//
// The Open Toolkit Library License
//
// Copyright (c) 2006 - 2009 the Open Toolkit library.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights to 
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;

namespace OpenTK.Platform.Windows
{
    using Graphics;
    using OpenTK.Input;
    using System.Runtime.InteropServices;

    class WinFactory : IPlatformFactory 
    {
        bool disposed;
        readonly object SyncRoot = new object();
        IInputDriver2 inputDriver;

        internal static IntPtr OpenGLHandle { get; private set; }
        const string OpenGLName = "OPENGL32.DLL";

        public WinFactory()
        {
            if (System.Environment.OSVersion.Version.Major <= 4)
            {
                throw new PlatformNotSupportedException("OpenTK requires Windows XP or higher");
            }

            // Dynamically load opengl32.dll in order to use the extension loading capabilities of Wgl.
            // Note: opengl32.dll must be loaded before gdi32.dll, otherwise strange failures may occur
            // (such as "error: 2000" when calling wglSetPixelFormat or slowness/lag on specific GPUs).
            LoadOpenGL();

            if (System.Environment.OSVersion.Version.Major >= 6)
            {
                if (Toolkit.Options.EnableHighResolution)
                {
                    // Enable high-dpi support
                    // Only available on Windows Vista and higher
                    bool result = Functions.SetProcessDPIAware();
                    Debug.Print("SetProcessDPIAware() returned {0}", result);
                }
            }
        }

        static void LoadOpenGL()
        {
            OpenGLHandle = Functions.LoadLibrary(OpenGLName);
            if (OpenGLHandle == IntPtr.Zero)
            {
                throw new ApplicationException(String.Format("LoadLibrary(\"{0}\") call failed with code {1}",
                    OpenGLName, Marshal.GetLastWin32Error()));
            }
            Debug.WriteLine(String.Format("Loaded opengl32.dll: {0}", OpenGLHandle));
        }

        #region IPlatformFactory Members

        public virtual INativeWindow CreateNativeWindow(int x, int y, int width, int height, string title, GraphicsMode mode, GameWindowFlags options, DisplayDevice device)
        {
            return new WinGLNative(x, y, width, height, title, options, device);
        }

        public virtual IDisplayDeviceDriver CreateDisplayDeviceDriver()
        {
            return new WinDisplayDeviceDriver();
        }

        public virtual IGraphicsContext CreateGLContext(GraphicsMode mode, IWindowInfo window, IGraphicsContext shareContext, bool directRendering, int major, int minor, GraphicsContextFlags flags)
        {
            return new WinGLContext(mode, (WinWindowInfo)window, shareContext, major, minor, flags);
        }

        public virtual IGraphicsContext CreateGLContext(ContextHandle handle, IWindowInfo window, IGraphicsContext shareContext, bool directRendering, int major, int minor, GraphicsContextFlags flags)
        {
            return new WinGLContext(handle, (WinWindowInfo)window, shareContext, major, minor, flags);
        }

        public virtual GraphicsContext.GetCurrentContextDelegate CreateGetCurrentGraphicsContext()
        {
            return (GraphicsContext.GetCurrentContextDelegate)delegate
            {
                return new ContextHandle(Wgl.GetCurrentContext());
            };
        }

        public virtual IGraphicsMode CreateGraphicsMode()
        {
            throw new NotSupportedException();
        }

        public virtual OpenTK.Input.IKeyboardDriver2 CreateKeyboardDriver()
        {
            return InputDriver.KeyboardDriver;
        }

        public virtual OpenTK.Input.IMouseDriver2 CreateMouseDriver()
        {
            return InputDriver.MouseDriver;
        }

        public virtual OpenTK.Input.IGamePadDriver CreateGamePadDriver()
        {
            return InputDriver.GamePadDriver;
        }
        
        #endregion

        IInputDriver2 InputDriver
        {
            get
            {
                lock (SyncRoot)
                {
                    if (inputDriver == null)
                    {
                        inputDriver = new WinRawInput();
                    }
                    return inputDriver;
                }
            }
        }

        #region IDisposable Members

        void Dispose(bool manual)
        {
            if (!disposed)
            {
                if (manual)
                {
                    InputDriver.Dispose();
                }
                else
                {
                    Debug.Print("{0} leaked, did you forget to call Dispose()?", GetType());
                }
                disposed = true;
            }
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        ~WinFactory()
        {
            Dispose(false);
        }

        #endregion
    }
}