using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Workplace
{
    public static class Utils
    {
        [DllImport("user32.dll")]
        static extern bool SetForegroundWindow(IntPtr hWnd, string formName);
        [DllImport("user32.dll")]
        private static extern IntPtr GetForegroundWindow();
        [DllImport("user32.dll")]
        private static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, int dwExtraInfo);
        [DllImport("user32.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
        [DllImport("user32.dll")]
        private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);


        private const int ALT = 0xA4;
        private const int EXTENDEDKEY = 0x1;
        private const int KEYUP = 0x2;
        private const int SHOW_MAXIMIZED = 3;

        public static bool Activate(string windowClassName)
        {
            IntPtr hWnd = FindWindow(windowClassName, null); // this gives you the handle of the window you need.

            // then use this handle to bring the window to focus or forground(I guessed you wanted this).

            // sometimes the window may be minimized and the setforground function cannot bring it to focus so:

            /*use this ShowWindow(IntPtr handle, int nCmdShow);
            *there are various values of nCmdShow 3, 5 ,9. What 9 does is: 
            *Activates and displays the window. If the window is minimized or maximized, *the system restores it to its original size and position. An application *should specify this flag when restoring a minimized window */

            ShowWindow(hWnd, 9);
            //The bring the application to focus
            SetForegroundWindow(hWnd);

            return true;


            //try
            //{
            //    //This is the same as the name of the executable without the .exe at the end            
            //    Process[] processes = Process.GetProcessesByName(processName);
            //    if (processes.Length >= 1)
            //    {
            //        ActivateWindow(processes[0].MainWindowHandle);
            //        return true;
            //    }
            //    return false;
            //}
            //catch (Exception e)
            //{
            //    return false;
            //}
        }

        //public static void ActivateWindow(IntPtr mainWindowHandle)
        //{
        //    // Guard: check if window already has focus.
        //    if (mainWindowHandle == GetForegroundWindow()) return;

        //    // Show window maximized.
        //    ShowWindow(mainWindowHandle, SHOW_MAXIMIZED);
            
        //    // Simulate an "ALT" key press.
        //    keybd_event((byte)ALT, 0x45, EXTENDEDKEY | 0, 0);
                        
        //    // Simulate an "ALT" key release.
        //    keybd_event((byte)ALT, 0x45, EXTENDEDKEY | KEYUP, 0);

        //    // Show window in forground.
        //    SetForegroundWindow(mainWindowHandle);
        //}        
    }
}