using System;
using System.Runtime.InteropServices;

#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.Windows.GL3.Helpers
{
	internal static class WindowsInterop
	{
		#region RECT (Helper struct)
		[StructLayout(LayoutKind.Sequential)]
		private struct RECT
		{
			/// <summary>
			/// X position of upper-left corner.
			/// </summary>
			public int Left;
			/// <summary>
			/// Y position of upper-left corner.
			/// </summary>
			public int Top;
			/// <summary>
			/// X position of lower-right corner.
			/// </summary>
			public int Right;
			/// <summary>
			/// Y position of lower-right corner.
			/// </summary>
			public int Bottom;
		}
		#endregion

		#region Invokes
		[DllImport("user32.dll")]
		private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter,
			int x, int y, int width, int height, uint uFlags);

		[DllImport("user32.dll")]
		[return: MarshalAs(UnmanagedType.Bool)]
		private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);

		[DllImport("user32.dll")]
		[return: MarshalAs(UnmanagedType.Bool)]
		private static extern bool GetClientRect(IntPtr hWnd, out RECT lpRect);
		#endregion

		#region ResizeWindow
		public static void ResizeWindow(IntPtr windowHandle, int backBufferWidth,
			int backBufferHeight)
		{
			RECT windowRect;
			RECT clientRect;
			if (GetWindowRect(windowHandle, out windowRect) &&
				GetClientRect(windowHandle, out clientRect))
			{
				int width = backBufferWidth + ((windowRect.Right - windowRect.Left) -
					clientRect.Right);
				int height = backBufferHeight + ((windowRect.Bottom - windowRect.Top) -
					clientRect.Bottom);

				SetWindowPos(windowHandle, IntPtr.Zero, windowRect.Left, windowRect.Top,
					width, height, 0);
			}
		}
		#endregion
	}
}