using UnityEngine;
using System.Collections;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Windows.Forms;
using System.Threading;

//namespace System.Windows.Forms;

public class Test {
    delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);
    [DllImport("user32.dll")]
    static extern bool EnumChildWindows(IntPtr hwndParent, EnumWindowsProc lpEnumFunc, IntPtr lParam);
    [DllImport("user32.dll")]
    static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);
    [DllImport("user32.dll")]
    public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
    [DllImport("user32.dll")]
    public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
    [DllImport("user32.dll")]
    public static extern IntPtr PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
    [DllImport("user32.DLL")]
    public static extern bool SetForegroundWindow(IntPtr hWnd);
    [DllImport("user32.dll")]
    static extern IntPtr GetForegroundWindow();


    const uint WM_KEYDOWN = 0x100;
    const uint WM_KEYUP = 0x0101;
    static IntPtr m_hWndEdit = IntPtr.Zero;

    public static void SendKeystroke(ushort k)
    {


        IntPtr hWnd = FindWindow("UnityWndClass", null);
        //IntPtr hWndEdit = IntPtr.Zero;

        //EnumChildWindows(hWnd, EnumChildWindowsCallback, hWndEdit);

        if (hWnd != null)
        {

            //IntPtr curhWnd = GetForegroundWindow ();
            SetForegroundWindow (hWnd);
            SendMessage(hWnd, WM_KEYDOWN, ((IntPtr)k), (IntPtr)0);
            SendMessage(hWnd, WM_KEYUP, ((IntPtr)k), (IntPtr)0);
            //SetForegroundWindow (curhWnd);

        }
    }

    static bool EnumChildWindowsCallback(IntPtr hWnd, IntPtr lParam)
    {
        // Search for notepads edit window - if we find it "false" is returned (means stop enumerating windows)

        StringBuilder sb = new StringBuilder();
        GetClassName(hWnd, sb, 256);

        if (!sb.ToString().Contains("Edit"))
        {
            return true;
        }

        m_hWndEdit = hWnd; // Store the handle to notepads edit window (this is the window we want to send the messages to)
        return false;
    }
}