/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt VS Tools.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

using System;
using System.Runtime.InteropServices;
using System.Text;

namespace QtVsTools
{
    public static class NativeAPI
    {
        public const int GWL_STYLE = -16;
        public const int GWL_EXSTYLE = -20;
        public const int WS_VISIBLE = 0x10000000;
        public const int WM_CLOSE = 0x10;
        public const int WM_STYLECHANGED = 0x007D;
        public const int WM_GETICON = 0x007F;
        public const int WM_SETICON = 0x0080;
        public const int ICON_SMALL = 0;
        public const int GCL_HICON = -14;
        public const int GCL_HICONSM = -34;
        public const int SW_HIDE = 0;
        public const int SW_SHOWMINNOACTIVE = 7;
        public const int SW_RESTORE = 9;

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool EnumThreadWindows(
            uint dwThreadId,
            EnumThreadWindowsCallback lpfn,
            IntPtr lParam);

        public delegate bool EnumThreadWindowsCallback(IntPtr hWnd, IntPtr lParam);

        [DllImport("user32.dll", CharSet = CharSet.Unicode, EntryPoint = "GetWindowTextW")]
        public static extern int GetWindowText(IntPtr hwnd, StringBuilder lpString, int maxCount);

        public static string GetWindowCaption(IntPtr hwnd)
        {
            var caption = new StringBuilder(256);
            if (GetWindowText(hwnd, caption, caption.Capacity) > 0)
                return caption.ToString();
            else
                return string.Empty;
        }

        [DllImport("user32.dll")]
        public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll", EntryPoint = "GetWindowLongW", CharSet = CharSet.Unicode)]
        public static extern int GetWindowLong(IntPtr hWnd, int nIndex);

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

        [DllImport("user32.dll", EntryPoint = "GetClassLongW", CharSet = CharSet.Unicode)]
        public static extern int GetClassLong(IntPtr hWnd, int nIndex);

        [DllImport("user32.dll")]
        public static extern bool MoveWindow(
            IntPtr Handle,
            int x, int y,
            int w, int h,
            bool repaint);

        [DllImport("user32.dll")]
        public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

        [DllImport("user32.dll")]
        public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, int wParam, IntPtr lParam);

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

        [DllImport("user32.dll")]
        public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        [DllImport("shell32.dll", CharSet = CharSet.Auto)]
        public static extern int SHGetFileInfo(
          string pszPath,
          int dwFileAttributes,
          ref SHFILEINFO psfi,
          int cbfileInfo,
          SHGFI uFlags);

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

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public struct SHFILEINFO
        {
            /// <summary>Maximal Length of unmanaged Windows-Path-strings</summary>
            public const int MAX_PATH = 260;
            /// <summary>Maximal Length of unmanaged Typename</summary>
            public const int MAX_TYPE = 80;
            public SHFILEINFO(bool dummy = true)
            {
                hIcon = IntPtr.Zero;
                iIcon = 0;
                dwAttributes = 0;
                szDisplayName = "";
                szTypeName = "";
            }
            public IntPtr hIcon;
            public int iIcon;
            public uint dwAttributes;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_PATH)]
            public string szDisplayName;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_TYPE)]
            public string szTypeName;
        };

        [Flags]
        public enum SHGFI : int
        {
            /// <summary>get icon</summary>
            Icon = 0x000000100,
            /// <summary>get display name</summary>
            DisplayName = 0x000000200,
            /// <summary>get type name</summary>
            TypeName = 0x000000400,
            /// <summary>get attributes</summary>
            Attributes = 0x000000800,
            /// <summary>get icon location</summary>
            IconLocation = 0x000001000,
            /// <summary>return exe type</summary>
            ExeType = 0x000002000,
            /// <summary>get system icon index</summary>
            SysIconIndex = 0x000004000,
            /// <summary>put a link overlay on icon</summary>
            LinkOverlay = 0x000008000,
            /// <summary>show icon in selected state</summary>
            Selected = 0x000010000,
            /// <summary>get only specified attributes</summary>
            Attr_Specified = 0x000020000,
            /// <summary>get large icon</summary>
            LargeIcon = 0x000000000,
            /// <summary>get small icon</summary>
            SmallIcon = 0x000000001,
            /// <summary>get open icon</summary>
            OpenIcon = 0x000000002,
            /// <summary>get shell size icon</summary>
            ShellIconSize = 0x000000004,
            /// <summary>pszPath is a pidl</summary>
            PIDL = 0x000000008,
            /// <summary>use passed dwFileAttribute</summary>
            UseFileAttributes = 0x000000010,
            /// <summary>apply the appropriate overlays</summary>
            AddOverlays = 0x000000020,
            /// <summary>Get the index of the overlay in the upper 8 bits of the iIcon</summary>
            OverlayIndex = 0x000000040,
        }
    }
}