// Copyright (c) Microsoft Corporation
// The Microsoft Corporation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
using Microsoft.Win32.SafeHandles;
using static PowerLauncher.Helper.WindowsInteropHelper;

// http://blogs.microsoft.co.il/arik/2010/05/28/wpf-single-instance-application/
// modified to allow single instance restart
namespace PowerLauncher.Helper
{
    [SuppressUnmanagedCodeSecurity]
    internal static class NativeMethods
    {
        /// <summary>
        /// Delegate declaration that matches WndProc signatures.
        /// </summary>
        public delegate IntPtr MessageHandler(WM uMsg, IntPtr wParam, IntPtr lParam, out bool handled);

        [DllImport("shell32.dll", EntryPoint = "CommandLineToArgvW", CharSet = CharSet.Unicode)]
        private static extern IntPtr Shell32CommandLineToArgvW([MarshalAs(UnmanagedType.LPWStr)] string cmdLine, out int numArgs);

        [DllImport("kernel32.dll", EntryPoint = "LocalFree", SetLastError = true)]
        internal static extern IntPtr Kernel32LocalFree(IntPtr hMem);

        [DllImport("user32.dll")]
        internal static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

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

        [DllImport("user32.dll")]
        internal static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

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

        [DllImport("user32.dll")]
        internal static extern IntPtr GetDesktopWindow();

        [DllImport("user32.dll")]
        internal static extern IntPtr GetShellWindow();

        [DllImport("user32.dll", SetLastError = true)]
        internal static extern int GetWindowRect(IntPtr hwnd, out RECT rc);

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

        [DllImport("user32.DLL", CharSet = CharSet.Unicode)]
        internal static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

        public static string[] CommandLineToArgvW(string cmdLine)
        {
            IntPtr argv = IntPtr.Zero;
            try
            {
                argv = Shell32CommandLineToArgvW(cmdLine, out int numArgs);
                if (argv == IntPtr.Zero)
                {
                    throw new Win32Exception();
                }

                var result = new string[numArgs];

                for (int i = 0; i < numArgs; i++)
                {
                    IntPtr currArg = Marshal.ReadIntPtr(argv, i * Marshal.SizeOf(typeof(IntPtr)));
                    result[i] = Marshal.PtrToStringUni(currArg);
                }

                return result;
            }
            finally
            {
                _ = Kernel32LocalFree(argv);

                // Otherwise LocalFree failed.
                // Assert.AreEqual(IntPtr.Zero, p);
            }
        }
    }

    internal enum WM
    {
        NULL = 0x0000,
        CREATE = 0x0001,
        DESTROY = 0x0002,
        MOVE = 0x0003,
        SIZE = 0x0005,
        ACTIVATE = 0x0006,
        SETFOCUS = 0x0007,
        KILLFOCUS = 0x0008,
        ENABLE = 0x000A,
        SETREDRAW = 0x000B,
        SETTEXT = 0x000C,
        GETTEXT = 0x000D,
        GETTEXTLENGTH = 0x000E,
        PAINT = 0x000F,
        CLOSE = 0x0010,
        QUERYENDSESSION = 0x0011,
        QUIT = 0x0012,
        QUERYOPEN = 0x0013,
        ERASEBKGND = 0x0014,
        SYSCOLORCHANGE = 0x0015,
        SHOWWINDOW = 0x0018,
        SETTINGCHANGE = 0x001A,
        ACTIVATEAPP = 0x001C,
        SETCURSOR = 0x0020,
        MOUSEACTIVATE = 0x0021,
        CHILDACTIVATE = 0x0022,
        QUEUESYNC = 0x0023,
        GETMINMAXINFO = 0x0024,

        WINDOWPOSCHANGING = 0x0046,
        WINDOWPOSCHANGED = 0x0047,

        CONTEXTMENU = 0x007B,
        STYLECHANGING = 0x007C,
        STYLECHANGED = 0x007D,
        DISPLAYCHANGE = 0x007E,
        GETICON = 0x007F,
        SETICON = 0x0080,
        NCCREATE = 0x0081,
        NCDESTROY = 0x0082,
        NCCALCSIZE = 0x0083,
        NCHITTEST = 0x0084,
        NCPAINT = 0x0085,
        NCACTIVATE = 0x0086,
        GETDLGCODE = 0x0087,
        SYNCPAINT = 0x0088,
        NCMOUSEMOVE = 0x00A0,
        NCLBUTTONDOWN = 0x00A1,
        NCLBUTTONUP = 0x00A2,
        NCLBUTTONDBLCLK = 0x00A3,
        NCRBUTTONDOWN = 0x00A4,
        NCRBUTTONUP = 0x00A5,
        NCRBUTTONDBLCLK = 0x00A6,
        NCMBUTTONDOWN = 0x00A7,
        NCMBUTTONUP = 0x00A8,
        NCMBUTTONDBLCLK = 0x00A9,

        SYSKEYDOWN = 0x0104,
        SYSKEYUP = 0x0105,
        SYSCHAR = 0x0106,
        SYSDEADCHAR = 0x0107,
        COMMAND = 0x0111,
        SYSCOMMAND = 0x0112,

        MOUSEMOVE = 0x0200,
        LBUTTONDOWN = 0x0201,
        LBUTTONUP = 0x0202,
        LBUTTONDBLCLK = 0x0203,
        RBUTTONDOWN = 0x0204,
        RBUTTONUP = 0x0205,
        RBUTTONDBLCLK = 0x0206,
        MBUTTONDOWN = 0x0207,
        MBUTTONUP = 0x0208,
        MBUTTONDBLCLK = 0x0209,
        MOUSEWHEEL = 0x020A,
        XBUTTONDOWN = 0x020B,
        XBUTTONUP = 0x020C,
        XBUTTONDBLCLK = 0x020D,
        MOUSEHWHEEL = 0x020E,

        CAPTURECHANGED = 0x0215,

        ENTERSIZEMOVE = 0x0231,
        EXITSIZEMOVE = 0x0232,

        IME_SETCONTEXT = 0x0281,
        IME_NOTIFY = 0x0282,
        IME_CONTROL = 0x0283,
        IME_COMPOSITIONFULL = 0x0284,
        IME_SELECT = 0x0285,
        IME_CHAR = 0x0286,
        IME_REQUEST = 0x0288,
        IME_KEYDOWN = 0x0290,
        IME_KEYUP = 0x0291,

        NCMOUSELEAVE = 0x02A2,

        DWMCOMPOSITIONCHANGED = 0x031E,
        DWMNCRENDERINGCHANGED = 0x031F,
        DWMCOLORIZATIONCOLORCHANGED = 0x0320,
        DWMWINDOWMAXIMIZEDCHANGE = 0x0321,
        DWMSENDICONICTHUMBNAIL = 0x0323,
        DWMSENDICONICLIVEPREVIEWBITMAP = 0x0326,
        USER = 0x0400,

        // This is the hard-coded message value used by WinForms for Shell_NotifyIcon.
        // It's relatively safe to reuse.
        TRAYMOUSEMESSAGE = 0x800, // WM_USER + 1024
        APP = 0x8000,
    }
}