using UnityEngine;
using System;
using System.Runtime.InteropServices;
//using GYEngine;

public class WindowsHelper
{
#if UNITY_STANDALONE_WIN
    //设置当前窗口的显示状态
    [DllImport("user32.dll")]
    public static extern bool ShowWindow(System.IntPtr hwnd, int nCmdShow);

    //获取当前激活窗口
    [DllImport("user32.dll", EntryPoint = "GetForegroundWindow")]
    public static extern System.IntPtr GetForegroundWindow();

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

    //程序当前的激活窗口
    [DllImport("user32.dll", EntryPoint = "GetActiveWindow")]
    public static extern IntPtr GetActiveWindow();

    //设置窗口边框
    [DllImport("user32.dll")]
    public static extern IntPtr SetWindowLong(IntPtr hwnd, int _nIndex, int dwNewLong);

    //设置窗口位置，尺寸
    [DllImport("user32.dll")]
    public static extern bool SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

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

    [DllImport("user32.dll")]
    public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

    //更改标题栏
    [DllImport("user32.dll")]
    public static extern int SetWindowText(IntPtr hWnd, string text);

    //使用查找任务栏
    [DllImport("user32.dll")]
    public static extern IntPtr FindWindow(string strClassName, int nptWindowName);

    [DllImport("User32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]
    private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

    //获取窗口位置以及大小
    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect);

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool GetClientRect(IntPtr hWnd, ref RECT lpRect);

    [DllImport("user32.dll", SetLastError = true)]
    public static extern int GetSystemMetrics(int nIndex);

    private static int SM_CXSCREEN = 0; //主屏幕分辨率宽度
    private static int SM_CYSCREEN = 1; //主屏幕分辨率高度
    private static int SM_CYCAPTION = 4; //标题栏高度
    private static int SM_CXFULLSCREEN = 16; //最大化窗口宽度（减去任务栏）
    private static int SM_CYFULLSCREEN = 17; //最大化窗口高度（减去任务栏）

    public static Rect GetWorkingArea()
    {
        Rect rect = new Rect();
        // 屏幕WorkingArea
        rect.width = GetSystemMetrics(SM_CXFULLSCREEN);
        rect.height = GetSystemMetrics(SM_CYFULLSCREEN);
        return rect;
    }
    public static Rect GetScreen()
    {
        Rect rect = new Rect();
        // 屏幕分辨率
        rect.width = GetSystemMetrics(SM_CXSCREEN);
        rect.height = GetSystemMetrics(SM_CYSCREEN);

        // 标题栏高度
        //int title = GetSystemMetrics(SM_CYCAPTION);
        // 不最大化、不全屏的最大窗口高度
        //int maxHeight = y1 - title;
        return rect;
    }


    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        public int Left; //最左坐标
        public int Top; //最上坐标
        public int Right; //最右坐标
        public int Bottom; //最下坐标
    }

    //边框参数
    private const uint SWP_SHOWWINDOW = 0x0040;
    private const int GWL_STYLE = -16;
    private const int WS_BORDER = 1;

    //隐藏标题栏图标
    private const int WS_POPUP = 0x800000;
    private const int WS_SYSMENU = 0x80000;

    //最大最小化
    private const int SW_SHOWMINIMIZED = 2;//(最小化窗口)
    private const int SW_SHOWMAXIMIZED = 3;//最大化窗口

    //去除标题栏保留边框
    private const int WS_CAPTION = 0x00C00000;
    private const int WS_THICKFRAME = 0x00040000;

    private static IntPtr windowHandler = IntPtr.Zero;

    public static void InitWindowHandler()
    {
        WindowsHelper.windowHandler = GetActiveWindow();
    }

    public static void SaveWindowPosAndSize()
    {
        if (windowHandler == IntPtr.Zero) return;

        RECT clientrc = new RECT();
        GetClientRect(windowHandler, ref clientrc);      //获得窗口客户区大小 
        RECT windowrc = new RECT();
        GetWindowRect(windowHandler, ref windowrc);      //获得窗口大小
        // Debug.Log($"[{clientrc.Top},{clientrc.Bottom},{clientrc.Left},{clientrc.Right}] [{windowrc.Top},{windowrc.Bottom},{windowrc.Left},{windowrc.Right}]");

        int borderwidth = (windowrc.Right - windowrc.Left) - (clientrc.Right - clientrc.Left);
        int borderheight = (windowrc.Bottom - windowrc.Top) - (clientrc.Bottom - clientrc.Top);

        int width = Mathf.Abs(windowrc.Right - windowrc.Left);
        int height = Mathf.Abs(windowrc.Top - windowrc.Bottom);
        int x = windowrc.Left;
        int y = windowrc.Top;

        x += borderwidth / 2;
        y += borderheight / 2;
        width -= borderwidth;
        height -= borderheight;

        if (width < 375 || height < 812)
        {
            return;
        }

        //SettingManager.Instance.SetString("UNITY_STANDALONE_WIN_POS_AND_SIZE", string.Format($"{x}*{y}*{width}*{height}"));
    }

    //最小化窗口
    public static void SetMinWindows()
    {
        if (windowHandler == IntPtr.Zero) return;

        ShowWindow(windowHandler, SW_SHOWMINIMIZED);
        //具体窗口参数看这     https://msdn.microsoft.com/en-us/library/windows/desktop/ms633548(v=vs.85).aspx
    }

    /// <summary>
    /// 最大化窗口
    /// </summary>
    public static void SetMaxWindows()
    {
        if (windowHandler == IntPtr.Zero) return;
        
        int currMaxScreenHeight = Screen.currentResolution.height - GetTaskBarHeight();
        SetWindowPos(windowHandler, 0, 0, 0, Screen.currentResolution.width, currMaxScreenHeight, SWP_SHOWWINDOW);
        //ShowWindow(windowHandler, SW_SHOWMAXIMIZED);
    }

    public static bool SetCenterNoFrameWindow(int width, int height)
    {
        int startX = (Display.main.systemWidth - width) / 2;
        int startY = (Display.main.systemHeight - height) / 2;

        return SetNoFrameWindow(startX, startY, width, height);
    }

    public static bool SetUpperLeftNoFrameWindow(int width, int height)
    {
        int startX = 0;
        int startY = 0;

        return SetNoFrameWindow(startX, startY, width, height);
    }

    /// <summary>
    /// 设置无边框，窗口位置及分辨率
    /// </summary>
    /// <param name="rect">尺寸数据</param>
    public static bool SetNoFrameWindow(int x, int y, int width, int height)
    {
        if (windowHandler == IntPtr.Zero) return false;
        
        SetForegroundWindow(windowHandler);

        //去除上边栏（不可拖拽缩放）
        SetWindowLong(windowHandler, GWL_STYLE, WS_POPUP);

        //设置窗口位置及分辨率
        bool result = SetWindowPos(windowHandler, 0, x, y, width, height, SWP_SHOWWINDOW);
        return result;
    }

    public static bool SetCenterNoResizeWindow(int width, int height)
    {
        int startX = (Display.main.systemWidth - width) / 2;
        int startY = (Display.main.systemHeight - height) / 2;

        return SetNoResizeWindow(startX, startY, width, height);
    }

    public static bool SetUpperLeftNoResizeWindow(int width, int height)
    {
        int startX = 0;
        int startY = 0;

        return SetNoResizeWindow(startX, startY, width, height);
    }

    /// <summary>
    /// 设置不可调整大小，窗口位置及分辨率
    /// </summary>
    /// <param name="rect">尺寸数据</param>
    public static bool SetNoResizeWindow(int x, int y, int width, int height)
    {
        if (windowHandler == IntPtr.Zero) return false;
        
        SetForegroundWindow(windowHandler);

        //设置不可缩放
        SetWindowLong(windowHandler, GWL_STYLE, GetWindowLong(windowHandler, GWL_STYLE) & ~WS_THICKFRAME);

        RECT clientrc = new RECT();
        GetClientRect(windowHandler, ref clientrc);      //获得窗口客户区大小 
        RECT windowrc = new RECT();
        GetWindowRect(windowHandler, ref windowrc);      //获得窗口大小

        int borderwidth = (windowrc.Right - windowrc.Left) - (clientrc.Right - clientrc.Left);
        int borderheight = (windowrc.Bottom - windowrc.Top) - (clientrc.Bottom - clientrc.Top);

        x -= borderwidth / 2;
        y -= borderheight / 2;
        width += borderwidth;
        height += borderheight;

        //设置窗口位置及分辨率
        bool result = SetWindowPos(windowHandler, 0, x, y, width, height, SWP_SHOWWINDOW);
        return result;
    }

    /// <summary>
    /// 改变标题栏标题
    /// </summary>
    public static void ChangeTitleText()
    {
        if (windowHandler == IntPtr.Zero) return;

        SetWindowText(windowHandler, string.Empty);
    }

    /// <summary>
    /// 获取当前窗口尺寸
    /// </summary>
    /// <returns></returns>
    public static Rect GetWindowInfo()
    {
        if (windowHandler == IntPtr.Zero) return new Rect();
        RECT rect = new RECT();
        Rect targetRect = new Rect();
        GetWindowRect(windowHandler, ref rect);
        targetRect.width = Mathf.Abs(rect.Right - rect.Left);
        targetRect.height = Mathf.Abs(rect.Top - rect.Bottom);
        targetRect.x = rect.Left;
        targetRect.y = rect.Top;
        return targetRect;
    }

    /// <summary>
    /// 获取任务栏高度
    /// </summary>
    /// <returns>任务栏高度</returns>
    private static int GetTaskBarHeight()
    {
        int taskbarHeight = 10;
        IntPtr hWnd = FindWindow("Shell_TrayWnd", 0);
        RECT rect = new RECT();
        GetWindowRect(hWnd, ref rect);
        taskbarHeight = rect.Bottom - rect.Top;
        return taskbarHeight;
    }
#endif
}