using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace JD.UserControls.QuickOpenDialogs
{
    /// <summary>
    /// (Taken from CodeProject)
    /// </summary>
    public static class NativeMethods
    {
        internal const int WM_NCHITTEST = 0x0084,
                           WM_NCACTIVATE = 0x0086,
                           WS_EX_NOACTIVATE = 0x08000000,
                           HTTRANSPARENT = -1,
                           HTLEFT = 10,
                           HTRIGHT = 11,
                           HTTOP = 12,
                           HTTOPLEFT = 13,
                           HTTOPRIGHT = 14,
                           HTBOTTOM = 15,
                           HTBOTTOMLEFT = 16,
                           HTBOTTOMRIGHT = 17,
                           WM_USER = 0x0400,
                           WM_REFLECT = WM_USER + 0x1C00,
                           WM_COMMAND = 0x0111,
                           CBN_DROPDOWN = 7,
                           WM_GETMINMAXINFO = 0x0024;

        internal static int HIWORD(int n)
        {
            return (n >> 16) & 0xffff;
        }

        internal static int HIWORD(IntPtr n)
        {
            long ptrValue = n.ToInt64();

            // 64-bit compatibility?
            return HIWORD(unchecked((int)ptrValue));
        }

        internal static int LOWORD(int n)
        {
            return n & 0xffff;
        }

        internal static int LOWORD(IntPtr n)
        {
            long ptrValue = n.ToInt64();

            // 64-bit compatibility?
            return LOWORD(unchecked((int)ptrValue));
        }

        [StructLayout(LayoutKind.Sequential)]
        internal struct MINMAXINFO
        {
            public Point reserved;
            public Size maxSize;
            public Point maxPosition;
            public Size minTrackSize;
            public Size maxTrackSize;
        }

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

        [DllImport("user32.dll")]
        private static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll")]
        private static extern uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr ProcessId);

        [DllImport("kernel32.dll")]
        private static extern uint GetCurrentThreadId();

        [DllImport("user32.dll")]
        private static extern bool AttachThreadInput(uint idAttach, uint idAttachTo, bool fAttach);

        [DllImport("user32.dll")]
        private static extern IntPtr GetLastActivePopup(IntPtr hWnd);

        public static void SetForegroundWindowEx(IntPtr hWnd)
        {
            // Attach foreground window thread to our thread
            uint foreGroundID = GetWindowThreadProcessId(GetForegroundWindow(), IntPtr.Zero);
            uint currentID = GetCurrentThreadId();

            AttachThreadInput(foreGroundID, currentID, true);
            // Do our stuff here 
            IntPtr lastActivePopupWnd = GetLastActivePopup(hWnd);
            SetForegroundWindow(lastActivePopupWnd);

            // Detach the attached thread
            AttachThreadInput(foreGroundID, currentID, false);
        }
    }
}