using System;
using System.Diagnostics;
using System.IO;
using System.Text;

namespace SendMessage
{
    using System.IO.MemoryMappedFiles;
    using System.Runtime.InteropServices;

    class Program
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        internal static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        internal static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        internal static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        internal static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        internal static extern bool EnumChildWindows(IntPtr hWndParent, EnumWindowsProc lpEnumFunc, IntPtr lParam);

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        internal static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);

        private const int WM_USER = 0x400;
        private const int WM_MCOMMAND = WM_USER + 200;

        // Define EnumWindowsProc outside of Program class and make it public
        public delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

        static void Main(string[] args)
        {
            string executableName = Path.GetFileName(Process.GetCurrentProcess().MainModule.FileName);

            if (args.Length == 0 || !args[0].StartsWith("/"))
            {
                Console.WriteLine("Usage: {0} <command>", executableName);
                Console.WriteLine("Example: {0} /echo -s Hello World", executableName);
                return;
            }

            // Enumerate through all windows to find AdiIRC
            IntPtr adiircHwnd = IntPtr.Zero;
            EnumWindows((hWnd, lParam) =>
            {
                StringBuilder windowTitle = new StringBuilder(256);
                GetWindowText(hWnd, windowTitle, windowTitle.Capacity);

                if (windowTitle.ToString().Contains("AdiIRC")) // Adjust the condition as per the actual window title
                {
                    adiircHwnd = hWnd;
                    return false; // Stop enumeration
                }

                return true; // Continue enumeration
            }, IntPtr.Zero);

            if (adiircHwnd == IntPtr.Zero)
            {
                Console.WriteLine("Command not sent. Window not found.");
                return;
            }

            // Join all arguments into a single string
            string arguments = string.Join(" ", args);

            // Send message to AdiIRC window
            using (var mappedFile = MemoryMappedFile.CreateNew("mIRC1", 8192))
            {
                using (Stream stream = mappedFile.CreateViewStream())
                {
                    byte[] bytes = Encoding.UTF8.GetBytes(arguments);
                    stream.Write(bytes, 0, bytes.Length);
                }

                SendMessage(adiircHwnd, WM_MCOMMAND, 1, 1);
            }

            Console.WriteLine("Command sent successfully.");
        }
    }
}