/*
 * Copyright (c) 2024 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ProtonVPN is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

using System.Runtime.InteropServices;

namespace ProtonVPN.Client.Common.Interop;

public static class WindowHelper
{
    private const string DLL = "user32.dll";

    public const int GWLP_WNDPROC = -4;
    public const uint WM_ENDSESSION = 0x0016;
    public const uint WM_NCLBUTTONDBLCLK = 0x00A3;
    public const int HTCAPTION = 2;

    public delegate IntPtr WindowProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);

    [DllImport(DLL, SetLastError = true)]
    public static extern IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);

    [DllImport(DLL, SetLastError = true)]
    public static extern IntPtr CallWindowProc(IntPtr lpPrevWndFunc, IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
}