using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Management;
using System.Runtime.InteropServices;

namespace ZJ_BYD.Untils
{
    /// <summary>
    /// 触摸键盘工具类
    /// </summary>
    public class TouchKeyBoardHelper
    {
        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool Wow64DisableWow64FsRedirection(ref IntPtr ptr);
        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern bool Wow64RevertWow64FsRedirection(IntPtr ptr);
        private const UInt32 WM_SYSCOMMAND = 0x112;
        private const UInt32 SC_RESTORE = 0xf120;
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);
        private const string OnScreenKeyboadApplication = "osk.exe";

        /// <summary>
        /// 启用系统软键盘
        /// </summary>
        public static void OpenKeyBoardFun()
        {
            try
            {
                //判断软键盘是否进程是否已经存在，如果不存在进行调用
                Process[] pro = Process.GetProcessesByName("osk");
                //如果键盘已打开，则进行关闭操作
                if (pro != null && pro.Length > 0)
                {
                    CloseKeyBoardFun();
                    return;
                }

                // Get the name of the On screen keyboard
                string processName = System.IO.Path.GetFileNameWithoutExtension(OnScreenKeyboadApplication);

                var processList = new List<Process>(Process.GetProcesses());
                // Check whether the application is not running 
                var query = processList.FindAll((u) => u.ProcessName == processName);

                Process keyboardProcess = null;

                if (query != null && query.Count > 0)
                {
                    keyboardProcess = query[0];
                }

                // launch it if it doesn't exist
                if (keyboardProcess == null)
                {
                    IntPtr ptr = new IntPtr(); ;
                    bool sucessfullyDisabledWow64Redirect = false;

                    // Disable x64 directory virtualization if we're on x64,
                    // otherwise keyboard launch will fail.
                    if (Is64BitOperatingSystem)
                    {
                        sucessfullyDisabledWow64Redirect = Wow64DisableWow64FsRedirection(ref ptr);
                    }

                    // osk.exe is in windows/system folder. So we can directky call it without path
                    using (Process osk = new Process())
                    {
                        osk.StartInfo.FileName = OnScreenKeyboadApplication;
                        osk.Start();
                        //osk.WaitForInputIdle(2000);
                    }

                    // Re-enable directory virtualisation if it was disabled.
                    if (Is64BitOperatingSystem)
                        if (sucessfullyDisabledWow64Redirect)
                            Wow64RevertWow64FsRedirection(ptr);
                }
                else
                {
                    // Bring keyboard to the front if it's already running
                    var windowHandle = keyboardProcess.MainWindowHandle;
                    SendMessage(windowHandle, WM_SYSCOMMAND, new IntPtr(SC_RESTORE), new IntPtr(0));
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(ex.StackTrace);
            }
        }


        /// <summary>
        /// 关闭系统软键盘
        /// </summary>
        public static void CloseKeyBoardFun()
        {
            try
            {
                Process[] pros = Process.GetProcessesByName("osk");
                foreach (Process p in pros)
                {
                    p.Kill();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(ex.StackTrace);
            }
        }

        private static bool Is64BitOperatingSystem
        {
            get
            {
                try
                {
                    string addressWidth = String.Empty;
                    ConnectionOptions mConnOption = new ConnectionOptions();
                    ManagementScope mMs = new ManagementScope("//localhost", mConnOption);
                    ObjectQuery mQuery = new ObjectQuery("select AddressWidth from Win32_Processor");
                    ManagementObjectSearcher mSearcher = new ManagementObjectSearcher(mMs, mQuery);
                    ManagementObjectCollection mObjectCollection = mSearcher.Get();
                    foreach (ManagementObject mObject in mObjectCollection)
                    {
                        addressWidth = mObject["AddressWidth"].ToString();
                    }
                    return addressWidth == "64";
                }
                catch (Exception ex)
                {
                    return false;
                }
            }
        }
    }
}