using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;

namespace com.muldersoft.slunkcrypt.gui.utils
{
    public static class WindowHelper
    {
        private static readonly IEnumerable<bool> enableTopmost = Array.AsReadOnly(new bool[] { true, false });

        public static void BringWindowToTop(this Window window)
        {
            if (!ReferenceEquals(window, null))
            {
                try
                {
                    WindowInteropHelper interopHelper = new WindowInteropHelper(window);
                    NativeMethods.BringWindowToTop(interopHelper.Handle);
                    if (!NativeMethods.SetForegroundWindow(interopHelper.Handle))
                    {
                        foreach (bool flag in enableTopmost)
                        {
                            window.Topmost = flag;
                        }
                    }
                }
                catch { }
            }
        }

        public static void EnableResize(this Window window, bool enable)
        {
            if (!ReferenceEquals(window, null))
            {
                const int GWL_STYLE = -16;
                const uint WS_SIZEBOX = 0x40000;
                try
                {
                    WindowInteropHelper interopHelper = new WindowInteropHelper(window);
                    uint value = NativeMethods.GetWindowLong(interopHelper.Handle, GWL_STYLE);
                    if (value != 0)
                    {
                        NativeMethods.SetWindowLong(interopHelper.Handle, GWL_STYLE, enable ? (value | WS_SIZEBOX) : (value & (~WS_SIZEBOX)));
                    }
                }
                catch { }
            }
        }

        private static class NativeMethods
        {
            [DllImport("user32.dll", SetLastError = true)]
            public static extern bool BringWindowToTop(IntPtr hWnd);

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

            [DllImport("user32.dll", SetLastError = true)]
            public static extern uint GetWindowLong(IntPtr hWnd, int nIndex);

            [DllImport("user32.dll", SetLastError = true)]
            public static extern uint SetWindowLong(IntPtr hWnd, int nIndex, uint dwNewLong);
        }
    }
}