//******************************************************************************//
// UnsafeNative.cs
// 12/4/2023
//
// RAYTHEON PROPRIETARY: THIS DOCUMENT CONTAINS DATA OR INFORMATION
// PROPRIETARY TO RAYTHEON COMPANY AND IS RESTRICTED TO USE ONLY BY PERSONS
// AUTHORIZED BY RAYTHEON COMPANY IN WRITING TO USE IT. DISCLOSURE TO
// UNAUTHORIZED PERSONS WOULD LIKELY CAUSE SUBSTANTIAL COMPETITIVE HARM TO
// RAYTHEON COMPANY'S BUSINESS POSITION. NEITHER SAID DOCUMENT NOR ITS
// CONTENTS SHALL BE FURNISHED OR DISCLOSED TO OR COPIED OR USED BY PERSONS
// OUTSIDE RAYTHEON COMPANY WITHOUT THE EXPRESS WRITTEN APPROVAL OF RAYTHEON
// COMPANY.
//
// THIS PROPRIETARY NOTICE IS NOT APPLICABLE IF DELIVERED TO THE U.S. GOVERNMENT
//
// UNPUBLISHED WORK - COPYRIGHT RAYTHEON COMPANY.
//
// WARNING: THIS DOCUMENT CONTAINS TECHNICAL DATA AND / OR TECHNOLOGY WHOSE
// EXPORT OR DISCLOSURE TO NON-U.S. PERSONS, WHEREVER LOCATED, IS RESTRICTED
// BY THE INTERNATIONAL TRAFFIC IN ARMS REGULATIONS (ITAR) (22 C.F.R. SECTION
// 120-130) OR THE EXPORT ADMINISTRATION REGULATIONS (EAR) (15 C.F.R. SECTION
// 730-774). THIS DOCUMENT CANNOT BE EXPORTED (E.G., PROVIDED TO A SUPPLIER
// OUTSIDE OF THE UNITED STATES) OR DISCLOSED TO A NON-U.S. PERSON, WHEREVER
// LOCATED, UNTIL A FINAL JURISDICTION AND CLASSIFICATION DETERMINATION HAS
// BEEN COMPLETED AND APPROVED BY RAYTHEON, AND ANY REQUIRED U.S. GOVERNMENT
// APPROVALS HAVE BEEN OBTAINED. VIOLATIONS ARE SUBJECT TO SEVERE CRIMINAL
// PENALTIES.
//
// DOD 5220.22-M, INDUSTRIAL SECURITY MANUAL, CHAPTER 5, SECTION 1 THROUGH 9 :
// FOR CLASSIFIED DOCUMENTS FOLLOW THE PROCEDURES IN OR DOD 5200.1-R,
// INFORMATION SECURITY PROGRAM, CHAPTER 6. FOR UNCLASSIFIED, LIMITED DOCUMENTS
// DESTROY BY ANY  METHOD THAT WILL PREVENT DISCLOSURE OF CONTENTS OR
// RECONSTRUCTION OF THE DOCUMENT.
// POC: Alex Kravchenko (1118268)
//******************************************************************************//

// Ignore Spelling: COPYDATA

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Text;

namespace Raytheon.LogDashboard.Helpers
{
	internal static class UnsafeNative
	{
		public const int WM_COPYDATA = 0x004A;

		public static string GetMessage(int message, IntPtr lParam)
		{
			if (message == WM_COPYDATA)
			{
				try
				{
					var data = Marshal.PtrToStructure<CopyDataStruct>(lParam);
                    string result = string.Copy(data.lpData);
					return result;
				}
				catch
				{
					return null;
				}
			}

			return null;
		}

		public static void SendMessage(IntPtr hwnd, string message)
		{
            byte[] messageBytes = Encoding.Unicode.GetBytes(message); /* ANSII encoding */
            CopyDataStruct data = new CopyDataStruct
			{
				dwData = IntPtr.Zero,
				lpData = message,
				cbData = messageBytes.Length + 1 /* +1 because of \0 string termination */
			};

			if (SendMessage(hwnd, WM_COPYDATA, IntPtr.Zero, ref data) != 0)
            {
                throw new Win32Exception(Marshal.GetLastWin32Error());
            }
        }

		[DllImport("user32.dll")]
		public static extern bool SetForegroundWindow(IntPtr hWnd);

		[DllImport("User32.dll", EntryPoint = "SendMessage")]
		private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, ref CopyDataStruct lParam);

		[StructLayout(LayoutKind.Sequential)]
		private struct CopyDataStruct
		{
			public IntPtr dwData;
			public int cbData;

			[MarshalAs(UnmanagedType.LPWStr)]
			public string lpData;
		}
	}
}