using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace PTMedicalInsurance.Common.WinAPI
{
    class WndHelper
    {
        // <summary>
        /// 枚举窗口时的委托参数
        /// </summary>
        /// <param name="hWnd"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        public delegate bool WndEnumProc(IntPtr hWnd, int lParam);
        /// <summary>
        /// 枚举所有窗口
        /// </summary>
        /// <param name="lpEnumFunc"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        [DllImport("user32")]
        public static extern bool EnumWindows(WndEnumProc lpEnumFunc, int lParam);
        /// <summary>
        /// 获取窗口的父窗口句柄
        /// </summary>
        /// <param name="hWnd"></param>
        /// <returns></returns>
        [DllImport("user32")]
        public static extern IntPtr GetParent(IntPtr hWnd);

        [DllImport("user32")]
        public static extern int GetClassName(IntPtr hWnd, StringBuilder lpString, int nMaxCount);

        [DllImport("user32")]
        public static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);

        [DllImport("user32")]
        public static extern bool GetWindowRect(IntPtr hWnd, ref LPRECT rect);

        [DllImport("user32.dll")]
        public static extern IntPtr SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint wFlags);

        [StructLayout(LayoutKind.Sequential)]
        public readonly struct LPRECT
        {
            public readonly int Left;
            public readonly int Top;
            public readonly int Right;
            public readonly int Bottom;
        }

        public const int HWND_TOP = 0;
        public const int HWND_BOTTOM = 1;
        public const int HWND_TOPMOST = -1;
        public const int HWND_NOTOPMOST = -2;

        /// <summary>
        　　/// 设置窗体为TopMost
        　　/// </summary>
        　　/// <param name="hWnd"></param>
        public static void SetTopomost(IntPtr hWnd)
        {
            LPRECT rect = new LPRECT();
            GetWindowRect(hWnd, ref rect);
            SetWindowPos(hWnd, (IntPtr)HWND_TOPMOST, rect.Left, rect.Top, rect.Right - rect.Left, rect.Bottom - rect.Top, 0);
        }

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern IntPtr GetForegroundWindow();
        /// <summary>
        /// 判断是否窗体
        /// </summary>
        /// <param name="hWnd"></param>
        /// <returns></returns>
        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool IsWindow(IntPtr hWnd);
        /// <summary>
        /// 当前窗口是否最小化
        /// </summary>
        /// <param name="hWnd"></param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool IsIconic(IntPtr hWnd);
        /// <summary>
        /// 当前窗口是否最大化
        /// </summary>
        /// <param name="hWnd"></param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        public static extern bool IsZoomed(IntPtr hWnd);
        /// <summary>
        /// 判断窗口是否可见
        /// </summary>
        /// <param name="hWnd"></param>
        /// <returns></returns>
        [DllImport("user32")]
        public static extern bool IsWindowVisible(IntPtr hWnd);

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

        // 获取窗口文本长度
        /// <summary>
        /// 获取目标窗口标题的文本长度
        /// </summary>
        /// <param name="hWnd">目标窗口句柄</param>
        /// <returns>标题文本长度</returns>
        [DllImport("user32.dll")]
        public static extern int GetWindowTextLength(IntPtr hWnd);

        /// <summary>
        /// 获取窗口文本，文本会塞入StringBuilder中，需要指明字符串最大长度nMaxCount
        /// </summary>
        /// <param name="hwnd">窗口句柄</param>
        /// <param name="lpString">返回目标窗口的内容</param>
        /// <param name="nMaxCount">允许返回的字符数量上限</param>
        /// <returns>实际获取到的文本长度</returns>
        [DllImport("User32.dll", EntryPoint = "GetWindowText")]
        public static extern int GetWindowText(IntPtr hwnd, StringBuilder lpString, int nMaxCount);

        [DllImport("User32.dll", CharSet = CharSet.Auto)]
        public static extern int GetWindowThreadProcessId(IntPtr hwnd, out int ID);


        /// <summary>
        /// 获取 Win32 窗口的一些基本信息。
        /// </summary>
        public struct WindowInfo
        {
            public WindowInfo(IntPtr hWnd, string className, string title, bool isVisible, Rectangle bounds) : this()
            {
                Hwnd = hWnd;
                ClassName = className;
                Title = title;
                IsVisible = isVisible;
                Bounds = bounds;
            }

            /// <summary>
            /// 获取窗口句柄。
            /// </summary>
            public IntPtr Hwnd { get; }

            /// <summary>
            /// 获取窗口类名。
            /// </summary>
            public string ClassName { get; }

            /// <summary>
            /// 获取窗口标题。
            /// </summary>
            public string Title { get; }

            /// <summary>
            /// 获取当前窗口是否可见。
            /// </summary>
            public bool IsVisible { get; }

            /// <summary>
            /// 获取窗口当前的位置和尺寸。
            /// </summary>
            public Rectangle Bounds { get; }

            /// <summary>
            /// 获取窗口当前是否是最小化的。
            /// </summary>
            public bool IsMinimized => Bounds.Left == -32000 && Bounds.Top == -32000;
        }

        public struct wndInfo
        {
            public IntPtr hWnd;
            public string szWindowName;
            public string szClassName;
        }


        [DllImport("user32.dll")]
        private static extern int GetWindowTextW(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder lpString, int nMaxCount);

        [DllImport("user32.dll")]
        private static extern int GetClassNameW(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)] StringBuilder lpString, int nMaxCount);
        public static wndInfo[] GetAllDesktopWindows()
        {
            List<wndInfo> wndList = new List<wndInfo>();

            // 使用委托实现窗口枚举逻辑
            EnumWindows(delegate (IntPtr hWnd, int lParam)
            {
                wndInfo wnd = new wndInfo();
                StringBuilder sb = new StringBuilder(256);

                // 获取窗口句柄
                wnd.hWnd = hWnd;

                // 获取窗口名称
                GetWindowTextW(hWnd, sb, sb.Capacity);
                wnd.szWindowName = sb.ToString();

                // 获取窗口类名
                GetClassNameW(hWnd, sb, sb.Capacity);
                wnd.szClassName = sb.ToString();

                // 添加到列表中
                wndList.Add(wnd);

                return true;
            }, 0);

            return wndList.ToArray();
        }
        /// <summary>
        /// 查找当前用户空间下所有符合条件的(顶层)窗口。如果不指定条件，将仅查找可见且有标题栏的窗口。
        /// </summary>
        /// <param name="match">过滤窗口的条件。如果设置为 null，将仅查找可见和标题栏不为空的窗口。</param>
        /// <returns>找到的所有窗口信息</returns>
        public static IReadOnlyList<WindowInfo> FindAllWindows(Predicate<WindowInfo> match = null)
        {
            windowList = new List<WindowInfo>();
            //遍历窗口并查找窗口相关WindowInfo信息
            EnumWindows(OnWindowEnum, 0);
            return windowList.FindAll(match ?? DefaultPredicate);
        }
        /// <summary>
        /// 遍历窗体处理的函数
        /// </summary>
        /// <param name="hWnd"></param>
        /// <param name="lparam"></param>
        /// <returns></returns>
        public static bool OnWindowEnum(IntPtr hWnd, int lparam)
        {

            // 仅查找顶层窗口。
            if (GetParent(hWnd) == IntPtr.Zero)
            {
                // 获取窗口类名。
                var lpString = new StringBuilder(512);
                GetClassName(hWnd, lpString, lpString.Capacity);
                var className = lpString.ToString();

                // 获取窗口标题。
                var lptrString = new StringBuilder(512);
                GetWindowText(hWnd, lptrString, lptrString.Capacity);
                var title = lptrString.ToString().Trim();

                // 获取窗口可见性。
                var isVisible = IsWindowVisible(hWnd);

                // 获取窗口位置和尺寸。
                LPRECT rect = default;
                GetWindowRect(hWnd, ref rect);
                var bounds = new Rectangle(rect.Left, rect.Top, rect.Right - rect.Left, rect.Bottom - rect.Top);

                // 添加到已找到的窗口列表。
                windowList.Add(new WindowInfo(hWnd, className, title, isVisible, bounds));
            }

            return true;
        }
        /// <summary>
        /// 默认的查找窗口的过滤条件。可见 + 非最小化 + 包含窗口标题。
        /// </summary>
        public static readonly Predicate<WindowInfo> DefaultPredicate = x => x.IsVisible && !x.IsMinimized && x.Title.Length > 0;
        /// <summary>
        /// 窗体列表
        /// </summary>
        public static List<WindowInfo> windowList;

        /// <summary>
        /// 遍历子窗体(控件)
        /// </summary>
        /// <param name="hwndParent">父窗口句柄</param>
        /// <param name="lpEnumFunc">遍历的回调函数</param>
        /// <param name="lParam">传给遍历时回调函数的额外数据</param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool EnumChildWindows(IntPtr hwndParent, WndEnumProc lpEnumFunc, int lParam);


        /// <summary>
        /// 查找窗体
        /// </summary>
        /// <param name="lpClassName">窗体的类名称，比如Form、Window。若不知道，指定为null即可</param>
        /// <param name="lpWindowName">窗体的标题/文字</param>
        /// <returns></returns>
        [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        /// <summary>
        /// 查找子窗体（控件）
        /// </summary>
        /// <param name="hwndParent">父窗体句柄，不知道窗体时可指定IntPtr.Zero</param>
        /// <param name="hwndChildAfter">子窗体(控件)，通常不知道子窗体(句柄)，指定0即可</param>
        /// <param name="lpszClass">子窗体(控件)的类名，通常指定null，它是window class name，并不等同于C#中的列名Button、Image、PictureBox等，两者并不相同，可通过GetClassName获取正确的类型名</param>
        /// <param name="lpszWindow">子窗体的名字或控件的Title、Text，通常为显示的文字</param>
        /// <returns></returns>
        [DllImport("user32.dll", EntryPoint = "FindWindowEx", SetLastError = true)]
        public static extern IntPtr FindWindowEx(IntPtr hwndParent, uint hwndChildAfter, string lpszClass, string lpszWindow);

        //消息发送API
        [DllImport("user32.dll", EntryPoint = "PostMessage")]
        public static extern bool PostMessage(IntPtr hWnd, int Msg, uint wParam, uint lParam);

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

        [DllImport("user32.dll")] private static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, uint dwExtraInfo);

        private const int KEYEVENTF_EXTENDEDKEY = 0x1;
        private const int KEYEVENTF_KEYUP = 0x2;

        const uint WM_KEYDOWN = 0x100;
        const uint WM_KEYUP = 0x101;
        const uint WM_SYSKEYDOWN = 0x104;
        const uint WM_SYSKEYUP = 0x105;
        const int VK_CONTROL = 0x11; // Ctrl键
        const int VK_A = 0x41;      // A键
        const int VK_R = 0x52;
        const int VK_P = 0x50;
        const int VK_S = 0x53;
        const int VK_F = 0x46;
        const int VK_C = 0x43;

        public enum msgType
        { 
            send = 0,
            post =1,
            keybd_event =2
        }

        public static void SendMsg(msgType mType,IntPtr hWnd,int key)
        {
            //SetTopomost(hWnd);
            SetForegroundWindow(hWnd);
            switch (mType)
            {
                case msgType.send:
                    {
                        Thread.Sleep(2000);
                        SendMessage(hWnd, 0X100, (uint)key, 0);//
                        SendMessage(hWnd, 0X101, (uint)key, 0);//
                        break;
                    }
                case msgType.post:
                    {
                        PostMessage(hWnd, 0X100, (uint)key, 0);//
                        PostMessage(hWnd, 0X101, (uint)key, 0);//
                        break;
                    }
                case msgType.keybd_event:
                    {
                        keybd_event(Convert.ToByte(key), 0, 0, 0);
                        keybd_event(Convert.ToByte(key), 0, KEYEVENTF_KEYUP, 0);
                        break;
                    }
                default:
                    {
                        SendMessage(hWnd, 0X100, (uint)key, 0);//
                        SendMessage(hWnd, 0X101, (uint)key, 0);//
                        break;
                    }
            }
            //Lparam的解释壳参考
            //https://blog.csdn.net/deniece1/article/details/103588428  扫描码
            //https://blog.csdn.net/yizhe0731/article/details/103194401

        }




    }
}