/*
 * UniWinCore.cs
 * 
 * Author: Kirurobo http://twitter.com/kirurobo
 * License: MIT 许可证
 */

using System;
using System.Runtime.InteropServices;
using AOT;
using UnityEngine;
using System.Text;
#if UNITY_EDITOR
using UnityEditor;
#endif

namespace Kirurobo
{
    /// <summary>
    /// LibUniWinC 的原生插件包装
    /// </summary>
    internal class UniWinCore : IDisposable
    {
        /// <summary>
        /// 仅 Windows 下的透明方法类型
        /// </summary>
        public enum TransparentType : int
        {
            None = 0,
            Alpha = 1,
            ColorKey = 2,
        }


        /// <summary>
        /// 状态变更事件类型（实验性）
        /// </summary>
        [Flags]
        public enum WindowStateEventType : int
        {
            None = 0,
            StyleChanged = 1,
            Resized = 2,

            // 后续规格可能会有变更
            TopMostEnabled = 16 + 1 + 8,
            TopMostDisabled = 16 + 1,
            BottomMostEnabled = 32 + 1 + 8,
            BottomMostDisabled = 32 + 1,
            WallpaperModeEnabled = 64 + 1 + 8,
            WallpaperModeDisabled = 64 + 1,
        };

        #region Native functions
        protected class LibUniWinC
        {
            [UnmanagedFunctionPointer(CallingConvention.Winapi)]
            public delegate void StringCallback([MarshalAs(UnmanagedType.LPWStr)] string returnString);

            [UnmanagedFunctionPointer((CallingConvention.Winapi))]
            public delegate void IntCallback([MarshalAs(UnmanagedType.I4)] int value);


            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool IsActive();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool IsTransparent();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool IsBorderless();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool IsTopmost();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool IsBottommost();

            [DllImport("LibUniWinC", CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool IsMaximized();

            [DllImport("LibUniWinC", CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool IsFreePositioningEnabled();
            
            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool AttachMyWindow();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool AttachMyOwnerWindow();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool AttachMyActiveWindow();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool DetachWindow();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void Update();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetTransparent([MarshalAs(UnmanagedType.U1)] bool bEnabled);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetBorderless([MarshalAs(UnmanagedType.U1)] bool bEnabled);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetAlphaValue(float alpha);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetClickThrough([MarshalAs(UnmanagedType.U1)] bool bEnabled);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetTopmost([MarshalAs(UnmanagedType.U1)] bool bEnabled);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetBottommost([MarshalAs(UnmanagedType.U1)] bool bEnabled);

            [DllImport("LibUniWinC", CallingConvention = CallingConvention.Winapi)]
            public static extern void SetMaximized([MarshalAs(UnmanagedType.U1)] bool bZoomed);
            
            [DllImport("LibUniWinC", CallingConvention = CallingConvention.Winapi)]
            public static extern void EnableFreePositioning([MarshalAs(UnmanagedType.U1)] bool bEnabled);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetPosition(float x, float y);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool GetPosition(out float x, out float y);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetSize(float x, float y);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool GetSize(out float x, out float y);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool GetClientSize(out float width, out float height);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool GetClientRectangle(out float x, out float y, out float width, out float height);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool RegisterDropFilesCallback([MarshalAs(UnmanagedType.FunctionPtr)] StringCallback callback);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool UnregisterDropFilesCallback();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool RegisterMonitorChangedCallback([MarshalAs(UnmanagedType.FunctionPtr)] IntCallback callback);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool UnregisterMonitorChangedCallback();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool RegisterWindowStyleChangedCallback([MarshalAs(UnmanagedType.FunctionPtr)] IntCallback callback);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool UnregisterWindowStyleChangedCallback();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool SetAllowDrop([MarshalAs(UnmanagedType.U1)] bool enabled);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern int GetCurrentMonitor();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern int GetMonitorCount();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool GetMonitorRectangle(int index, out float x, out float y, out float width, out float height);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetCursorPosition(float x, float y);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool GetCursorPosition(out float x, out float y);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern int GetMouseButtons();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern int GetModifierKeys();


            #region 仅适用于 Windows
            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetTransparentType(int type);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern void SetKeyColor(uint colorref);

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            public static extern int GetDebugInfo();

            [DllImport("LibUniWinC",CallingConvention=CallingConvention.Winapi)]
            [return: MarshalAs(UnmanagedType.Bool)]
            public static extern bool AttachWindowHandle(IntPtr hWnd);
            #endregion
        }
        #endregion

        static string[] lastDroppedFiles;
        static bool wasDropped = false;
        static bool wasMonitorChanged = false;
        static bool wasWindowStyleChanged = false;
        static WindowStateEventType windowStateEventType = WindowStateEventType.None;

#if UNITY_EDITOR
        /// <summary>
        /// 获取 Unity 编辑器窗口
        /// </summary>
        /// <returns></returns>
        /// <seealso href="http://baba-s.hatenablog.com/entry/2017/09/17/135018"/>
        public static EditorWindow GetGameView()
        {
            var assembly = typeof(EditorWindow).Assembly;
            var type = assembly.GetType("UnityEditor.GameView");
            var gameView = EditorWindow.GetWindow(type);
            return gameView;
        }
#endif

        /// <summary>
        /// 判断窗口是否已附加且可用
        /// </summary>
        /// <value><c>true</c> 如果此实例处于活动状态；否则为 <c>false</c>。</value>
        public bool IsActive { get; private set; } = false;

        /// <summary>
        /// 判断附加窗口是否始终置顶
        /// </summary>
        public bool IsTopmost { get { return (IsActive && _isTopmost); } }
        private bool _isTopmost = false;

        /// <summary>
        /// 判断附加窗口是否始终置底
        /// </summary>
        public bool IsBottommost { get { return (IsActive && _isBottommost); } }
        private bool _isBottommost = false;

        /// <summary>
        /// 判断附加窗口是否透明
        /// </summary>
        public bool IsTransparent { get { return (IsActive && _isTransparent); } }
        private bool _isTransparent = false;

        /// <summary>
        /// 判断附加窗口是否点击穿透（即不接收任何鼠标操作）
        /// </summary>
        public bool IsClickThrough { get { return (IsActive && _isClickThrough); } }
        private bool _isClickThrough = false;

        /// <summary>
        /// 判断附加窗口是否无边框（无标题栏和边框）
        /// </summary>
        public bool IsBorderless { get { return (IsActive && _isBorderless); } }
        private bool _isBorderless = false;

        /// <summary>
        /// 判断附加窗口是否可以自由定位（仅 macOS）
        /// </summary>
        public bool IsFreePositioningEnabled { get { return (IsActive && _isFreePositioningEnabled); } }
        private bool _isFreePositioningEnabled = false;

        /// <summary>
        /// Windows 下的透明方法类型
        /// </summary>
        private TransparentType transparentType = TransparentType.Alpha;

        /// <summary>
        /// 当 transparentType 为 ColorKey 时用于透明的颜色
        /// </summary>
        private Color32 keyColor = new Color32(1, 0, 1, 0);


        #region Constructor or destructor
        /// <summary>
        /// 窗口控制构造函数
        /// </summary>
        public UniWinCore()
        {
            IsActive = false;
        }

        /// <summary>
        /// 析构函数
        /// </summary>
        ~UniWinCore()
        {
            Dispose();
        }

        /// <summary>
        /// 结束时的处理
        /// </summary>
        public void Dispose()
        {
            // 由于最后恢复窗口状态会引起注意，所以特意不恢复，因此注释掉
            //DetachWindow();

            // 替代 DetachWindow()
            LibUniWinC.UnregisterDropFilesCallback();
            LibUniWinC.UnregisterMonitorChangedCallback();
            LibUniWinC.UnregisterWindowStyleChangedCallback();
        }
        #endregion


        #region Callbacks

        /// <summary>
        /// 显示器或分辨率变化时的回调
        /// 此处的处理保持最低限度，仅设置标志
        /// </summary>
        /// <param name="monitorCount"></param>
        [MonoPInvokeCallback(typeof(LibUniWinC.IntCallback))]
        private static void _monitorChangedCallback([MarshalAs(UnmanagedType.I4)] int monitorCount)
        {
            wasMonitorChanged = true;
        }

        /// <summary>
        /// 窗口样式、最大化、最小化等调用的回调
        /// 此处的处理保持最低限度，仅设置标志
        /// </summary>
        /// <param name="e"></param>
        [MonoPInvokeCallback(typeof(LibUniWinC.IntCallback))]
        private static void _windowStyleChangedCallback([MarshalAs(UnmanagedType.I4)] int e)
        {
            wasWindowStyleChanged = true;
            windowStateEventType = (WindowStateEventType)e;
        }

        /// <summary>
        /// 文件或文件夹被拖放时调用的回调
        /// 将字符串转换为数组，并设置标志位
        /// </summary>
        /// <param name="paths"></param>
        [MonoPInvokeCallback(typeof(LibUniWinC.StringCallback))]
        private static void _dropFilesCallback([MarshalAs(UnmanagedType.LPWStr)] string paths)
        {
            // 将以 LF 分隔的字符串分割为路径数组
            //char[] delimiters = { '\n', '\0' };
            //string[] files = paths.Split(delimiters).Where(s => s != "").ToArray();
            string[] files = parsePaths(paths);

            if (files.Length > 0)
            {
                lastDroppedFiles = new string[files.Length];
                files.CopyTo(lastDroppedFiles, 0);

                wasDropped = true;
            }
        }

        /// <summary>
        /// 将双引号包围、LF（或null）分隔的字符串转换为数组并返回
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        internal static string[] parsePaths(string text)
        {
            System.Collections.Generic.List<string> list = new System.Collections.Generic.List<string>();
            bool inEscaped = false;
            int len = text.Length;
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < len; i++)
            {
                char c = text[i];
                if (c == '"')
                {
                    if (inEscaped)
                    {
                        if (((i + 1) < len) && text[i + 1] == '"')
                        {
                            i++;
                            sb.Append(c);   // 连续双引号视为一个双引号
                            continue;
                        }
                    }
                    inEscaped = !inEscaped; // 非连续则切换是否在引号内
                }
                else if (c == '\n')
                {
                    if (inEscaped)
                    {
                        // 如果在引号内，则作为路径的一部分
                        sb.Append(c);
                    }
                    else
                    {
                        // 如果不在引号内，则作为分隔符，移到下一个路径
                        if (sb.Length > 0)
                        {
                            list.Add(sb.ToString());
                            //sb.Clear();   // for .NET 4 or later
                            sb.Length = 0;  // for .NET 2
                        }
                    }
                }
                else if (c == '\0')
                {
                    // 空字符始终作为分隔符，移到下一个路径
                    if (sb.Length > 0)
                    {
                        list.Add(sb.ToString());
                        //sb.Clear();   // for .NET 4 or later
                        sb.Length = 0;  // for .NET 2
                    }
                }
                else
                {
                    sb.Append(c);
                }
            }
            if (sb.Length > 0)
            {
                list.Add(sb.ToString());
            }

            // 移除空字符串元素
            list.RemoveAll(v => v.Length == 0);
            return list.ToArray();
        }

        #endregion

        #region Find, attach or detach 

        /// <summary>
        /// 将窗口状态恢复至最初并从操作对象中解除
        /// </summary>
        public void DetachWindow()
        {
#if UNITY_EDITOR
            // 在编辑器中，窗口样式可能无法正确获取置顶状态，
            // 因此默认视为非置顶，在分离时强制取消置顶
            EnableTopmost(false);
#endif
            LibUniWinC.DetachWindow();
        }

        /// <summary>
        /// 查找自己的窗口（如果游戏视图是独立窗口则查找它）并作为操作对象
        /// </summary>
        /// <returns></returns>
        public bool AttachMyWindow()
        {
#if UNITY_EDITOR_WIN
            // 似乎没有可靠的方法获取游戏视图，因此给予焦点后立即获取活动窗口
            var gameView = GetGameView();
            if (gameView)
            {
                gameView.Focus();
                LibUniWinC.AttachMyActiveWindow();
            }
#else
            LibUniWinC.AttachMyWindow();
#endif
            // 添加事件处理程序
            LibUniWinC.RegisterDropFilesCallback(_dropFilesCallback);
            LibUniWinC.RegisterMonitorChangedCallback(_monitorChangedCallback);
            LibUniWinC.RegisterWindowStyleChangedCallback(_windowStyleChangedCallback);

            IsActive = LibUniWinC.IsActive();
            return IsActive;
        }

        public bool AttachWindowHandle(IntPtr hWnd)
        {
            LibUniWinC.AttachWindowHandle(hWnd);
            IsActive = LibUniWinC.IsActive();
            return IsActive;
        }

        /// <summary>
        /// 选择自己进程中当前活动的窗口
        /// 编辑器情况下，窗口会关闭或停靠，因此在聚焦时调用
        /// </summary>
        /// <returns></returns>
        public bool AttachMyActiveWindow()
        {
            LibUniWinC.AttachMyActiveWindow();
            IsActive = LibUniWinC.IsActive();
            return IsActive;
        }

        #endregion

        #region About window status
        /// <summary>
        /// 定期调用以维持窗口样式
        /// </summary>
        public void Update()
        {
            LibUniWinC.Update();
        }

        string GetDebubgWindowSizeInfo()
        {
            float x, y, cx, cy;
            LibUniWinC.GetSize(out x, out y);
            LibUniWinC.GetClientSize(out cx, out cy);
            return $"W:{x},H:{y} CW:{cx},CH:{cy}";
        }

        /// <summary>
        /// 设置/取消透明
        /// </summary>
        /// <param name="isTransparent"></param>
        public void EnableTransparent(bool isTransparent)
        {
            // 编辑器无法透明或边框与正常不同，因此跳过
#if !UNITY_EDITOR
            LibUniWinC.SetTransparent(isTransparent);
            LibUniWinC.SetBorderless(isTransparent);
#endif
            this._isTransparent = isTransparent;
        }

        /// <summary>
        /// 设置窗口透明度
        /// </summary>
        /// <param name="alpha">0.0 - 1.0</param>
        public void SetAlphaValue(float alpha)
        {
            // Windows 编辑器下，一旦半透明化后显示不会更新，因此禁用。Mac 则没问题
#if !UNITY_EDITOR_WIN
            LibUniWinC.SetAlphaValue(alpha);
#endif
        }

        /// <summary>
        /// 设置窗口 Z 顺序（是否置顶）。
        /// </summary>
        /// <param name="isTopmost">如果设为 <c>true</c> 则置顶。</param>
        public void EnableTopmost(bool isTopmost)
        {
            LibUniWinC.SetTopmost(isTopmost);
            this._isTopmost = isTopmost;
            this._isBottommost = false;    // 互斥
        }

        /// <summary>
        /// 设置窗口 Z 顺序（是否置底）。
        /// </summary>
        /// <param name="isBottommost">如果设为 <c>true</c> 则置底。</param>
        public void EnableBottommost(bool isBottommost)
        {
            LibUniWinC.SetBottommost(isBottommost);
            this._isBottommost = isBottommost;
            this._isTopmost = false;    // 互斥
        }

        /// <summary>
        /// 设置/取消点击穿透
        /// </summary>
        /// <param name="isThrough"></param>
        public void EnableClickThrough(bool isThrough)
        {
            // 编辑器下点击穿透可能导致无法操作，因此跳过
#if !UNITY_EDITOR
            LibUniWinC.SetClickThrough(isThrough);
#endif
            this._isClickThrough = isThrough;
        }

        /// <summary>
        /// 最大化窗口（Mac 上为缩放）
        /// 最大化后可能还会调整大小，目前可能无法可靠工作
        /// </summary>
        public void SetZoomed(bool isZoomed)
        {
            LibUniWinC.SetMaximized(isZoomed);
        }

        /// <summary>
        /// 获取窗口是否已最大化（Mac 上为缩放）
        /// 最大化后可能还会调整大小，目前可能无法可靠工作
        /// </summary>
        public bool GetZoomed()
        {
            return LibUniWinC.IsMaximized();
        }

        /// <summary>
        /// 设置窗口位置。
        /// </summary>
        /// <param name="position">位置。</param>
        public void SetWindowPosition(Vector2 position)
        {
            LibUniWinC.SetPosition(position.x, position.y);
        }

        /// <summary>
        /// 获取窗口位置。
        /// </summary>
        /// <returns>位置。</returns>
        public Vector2 GetWindowPosition()
        {
            Vector2 pos = Vector2.zero;
            LibUniWinC.GetPosition(out pos.x, out pos.y);
            return pos;
        }

        /// <summary>
        /// 设置窗口大小。
        /// </summary>
        /// <param name="size">x 为宽度，y 为高度</param>
        public void SetWindowSize(Vector2 size)
        {
            LibUniWinC.SetSize(size.x, size.y);
        }

        /// <summary>
        /// 获取窗口大小。
        /// </summary>
        /// <returns>x 为宽度，y 为高度</returns>
        public Vector2 GetWindowSize()
        {
            Vector2 size = Vector2.zero;
            LibUniWinC.GetSize(out size.x, out size.y);
            return size;
        }

        /// <summary>
        /// 获取客户区大小。
        /// </summary>
        /// <returns>x 为宽度，y 为高度</returns>
        public Vector2 GetClientSize()
        {
            Vector2 size = Vector2.zero;
            LibUniWinC.GetClientSize(out size.x, out size.y);
            return size;
        }

        /// <summary>
        /// 获取客户区矩形。
        /// </summary>
        /// <returns>x 为宽度，y 为高度</returns>
        public Rect GetClientRectangle()
        {
            Vector2 pos = Vector2.zero;
            Vector2 size = Vector2.zero;
            LibUniWinC.GetClientRectangle(out pos.x, out pos.y, out size.x, out size.y);
            return new Rect(pos.x, pos.y, size.x, size.y);
        }

#endregion

        #region File opening
        public void SetAllowDrop(bool enabled)
        {
            LibUniWinC.SetAllowDrop(enabled);
        }

#endregion

#region Event observers

        /// <summary>
        /// 检查文件拖放并取消拖放标志
        /// </summary>
        /// <param name="files"></param>
        /// <returns>如果文件被拖放则返回 true</returns>
        public bool ObserveDroppedFiles(out string[] files)
        {
            files = lastDroppedFiles;

            if (!wasDropped || files == null) return false;

            wasDropped = false;
            return true;
        }

        /// <summary>
        /// 检查显示器数量或分辨率变化，并取消标志
        /// </summary>
        /// <returns>如果已变化则返回 true</returns>
        public bool ObserveMonitorChanged()
        {
            if (!wasMonitorChanged) return false;

            wasMonitorChanged = false;
            return true;
        }

        /// <summary>
        /// 检查窗口样式是否已变更，并取消标志
        /// </summary>
        /// <returns>如果窗口样式已变更则返回 true</returns>
        public bool ObserveWindowStyleChanged()
        {
            if (!wasWindowStyleChanged) return false;

            windowStateEventType = WindowStateEventType.None;
            wasWindowStyleChanged = false;
            return true;
        }

        /// <summary>
        /// 检查窗口样式是否已变更，并取消标志
        /// </summary>
        /// <returns>如果窗口样式已变更则返回 true</returns>
        public bool ObserveWindowStyleChanged(out WindowStateEventType type)
        {
            if (!wasWindowStyleChanged)
            {
                type = WindowStateEventType.None;
                return false;
            }

            type = windowStateEventType;
            windowStateEventType = WindowStateEventType.None;
            wasWindowStyleChanged = false;
            return true;
        }

#endregion

#region About mouse cursor
        /// <summary>
        /// 设置鼠标指针位置。
        /// </summary>
        /// <param name="position">位置。</param>
        public static void SetCursorPosition(Vector2 position)
        {
            LibUniWinC.SetCursorPosition(position.x, position.y);
        }

        /// <summary>
        /// 获取鼠标指针位置。
        /// </summary>
        /// <returns>位置。</returns>
        public static Vector2 GetCursorPosition()
        {
            Vector2 pos = Vector2.zero;
            LibUniWinC.GetCursorPosition(out pos.x, out pos.y);
            return pos;
        }

        /// <summary>
        /// Get pressed mouse buttons.
        /// </summary>
        /// <returns>Bit flags of pressed buttons</returns>
        public static int GetMouseButtons()
        {
            return LibUniWinC.GetMouseButtons();
        }

        /// <summary>
        /// 获取按下的修饰键。
        /// </summary>
        /// <returns>按下键的位标志</returns>
        public static int GetModifierKeys()
        {
            return LibUniWinC.GetModifierKeys();
        }

        // 未实现
        public static bool GetCursorVisible()
        {
            return true;
        }
#endregion

#region for Windows only
        /// <summary>
        /// 指定透明方法（仅 Windows 支持）
        /// </summary>
        /// <param name="type"></param>
        public void SetTransparentType(TransparentType type)
        {
            LibUniWinC.SetTransparentType((Int32)type);
            transparentType = type;
        }

        /// <summary>
        /// 单色透明时指定透明色（仅 Windows 支持）
        /// </summary>
        /// <param name="color"></param>
        public void SetKeyColor(Color32 color)
        {
            LibUniWinC.SetKeyColor((UInt32)(color.b * 0x10000 + color.g * 0x100 + color.r));
            keyColor = color;
        }
        #endregion

        #region for macOS only
        /// <summary>
        /// 设置/取消窗口的自由配置（仅 macOS 支持）
        /// </summary>
        /// <param name="enabled"></param>
        public void EnableFreePositioning(bool enabled)
        {
            LibUniWinC.EnableFreePositioning(enabled);
            _isFreePositioningEnabled = LibUniWinC.IsFreePositioningEnabled();
        }
        #endregion

        #region About monitors
        /// <summary>
        /// 获取窗口所在显示器的索引
        /// </summary>
        /// <returns>显示器索引</returns>
        public int GetCurrentMonitor()
        {
            return LibUniWinC.GetCurrentMonitor();
        }

        /// <summary>
        /// 获取已连接显示器的数量
        /// </summary>
        /// <returns>数量</returns>
        public static int GetMonitorCount()
        {
            return LibUniWinC.GetMonitorCount();
        }

        /// <summary>
        /// 获取显示器的位置和大小
        /// </summary>
        /// <param name="index"></param>
        /// <param name="position"></param>
        /// <param name="size"></param>
        /// <returns></returns>
        public static bool GetMonitorRectangle(int index, out Vector2 position, out Vector2 size)
        {
            return LibUniWinC.GetMonitorRectangle(index, out position.x, out position.y, out size.x, out size.y);
        }

        /// <summary>
        /// 将窗口适配到指定显示器
        /// </summary>
        /// <param name="monitorIndex"></param>
        /// <returns></returns>
        public bool FitToMonitor(int monitorIndex)
        {
            float dx, dy, dw, dh;
            if (LibUniWinC.GetMonitorRectangle(monitorIndex, out dx, out dy, out dw, out dh))
            {
                // 如果处于最大化状态则先恢复
                if (LibUniWinC.IsMaximized()) LibUniWinC.SetMaximized(false);

                // 指定显示器的中心坐标
                float cx = dx + (dw / 2);
                float cy = dy + (dh / 2);

                // 将窗口中心移动到指定显示器中心
                float ww, wh;
                LibUniWinC.GetSize(out ww, out wh);
                float wx = cx - (ww / 2);
                float wy = cy - (wh / 2);
                LibUniWinC.SetPosition(wx, wy);

                // 最大化
                LibUniWinC.SetMaximized(true);

                //Debug.Log(String.Format("显示器 {4} : {0},{1} - {2},{3}", dx, dy, dw, dh, monitorIndex));
                return true;
            }
            return false;
        }

        /// <summary>
        /// 打印显示器列表
        /// </summary>
        [Obsolete]
        public static void DebugMonitorInfo()
        {
            int monitors = LibUniWinC.GetMonitorCount();

            int currentMonitorIndex = LibUniWinC.GetCurrentMonitor();

            string message = "当前显示器: " + currentMonitorIndex + "\r\n";

            for (int i = 0; i < monitors; i++)
            {
                float x, y, w, h;
                bool result = LibUniWinC.GetMonitorRectangle(i, out x, out y, out w, out h);
                message += String.Format(
                    "显示器 {0}: X:{1}, Y:{2} - W:{3}, H:{4}\r\n",
                    i, x, y, w, h
                );
            }
            Debug.Log(message);
        }


        /// <summary>
        /// 获取用于调试的信息
        /// </summary>
        /// <returns></returns>
        [Obsolete]
        public static int GetDebugInfo()
        {
            return LibUniWinC.GetDebugInfo();
        }
#endregion

    }
}