using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Security.Principal;
using System.Text;
using System.Threading.Tasks;

namespace PDF_Office.Helper
{
    /// <summary>
    /// 设置成默认阅读器的辅助类
    /// </summary>
    public static class Win32Helper
    {
        [StructLayout(LayoutKind.Sequential)]
        public struct SECURITY_ATTRIBUTES
        {
            public int nLength;
            public IntPtr lpSecurityDescriptor;
            public int bInheritHandle;
        }
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        public struct STARTUPINFO
        {
            public Int32 cb;
            public string lpReserved;
            public string lpDesktop;
            public string lpTitle;
            public Int32 dwX;
            public Int32 dwY;
            public Int32 dwXSize;
            public Int32 dwYSize;
            public Int32 dwXCountChars;
            public Int32 dwYCountChars;
            public Int32 dwFillAttribute;
            public Int32 dwFlags;
            public Int16 wShowWindow;
            public Int16 cbReserved2;
            public IntPtr lpReserved2;
            public IntPtr hStdInput;
            public IntPtr hStdOutput;
            public IntPtr hStdError;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct PROCESS_INFORMATION
        {
            public IntPtr hProcess;
            public IntPtr hThread;
            public int dwProcessId;
            public int dwThreadId;
        }

        [Flags]
        public enum HChangeNotifyEventID
        {

            SHCNE_ALLEVENTS = 0x7FFFFFFF,
            SHCNE_ASSOCCHANGED = 0x08000000,
            SHCNE_ATTRIBUTES = 0x00000800,
            SHCNE_CREATE = 0x00000002,
            SHCNE_DELETE = 0x00000004,
            SHCNE_DRIVEADD = 0x00000100,
            SHCNE_DRIVEADDGUI = 0x00010000,
            SHCNE_DRIVEREMOVED = 0x00000080,
            SHCNE_EXTENDED_EVENT = 0x04000000,
            SHCNE_FREESPACE = 0x00040000,
            SHCNE_MEDIAINSERTED = 0x00000020,
            SHCNE_MEDIAREMOVED = 0x00000040,
            SHCNE_MKDIR = 0x00000008,
            SHCNE_NETSHARE = 0x00000200,
            SHCNE_NETUNSHARE = 0x00000400,
            SHCNE_RENAMEFOLDER = 0x00020000,
            SHCNE_RENAMEITEM = 0x00000001,
            SHCNE_RMDIR = 0x00000010,
            SHCNE_SERVERDISCONNECT = 0x00004000,
            SHCNE_UPDATEDIR = 0x00001000,
            SHCNE_UPDATEIMAGE = 0x00008000,
        }
        [Flags]
        public enum HChangeNotifyFlags
        {
            SHCNF_DWORD = 0x0003,
            SHCNF_IDLIST = 0x0000,
            SHCNF_PATHA = 0x0001,
            SHCNF_PATHW = 0x0005,
            SHCNF_PRINTERA = 0x0002,
            SHCNF_PRINTERW = 0x0006,
            SHCNF_FLUSH = 0x1000,
            SHCNF_FLUSHNOWAIT = 0x2000
        }

        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        public static extern bool CreateProcess(string lpApplicationName, string lpCommandLine, ref SECURITY_ATTRIBUTES lpProcessAttributes, ref SECURITY_ATTRIBUTES lpThreadAttributes,
    bool bInheritHandles, uint dwCreationFlags, IntPtr lpEnvironment, string lpCurrentDirectory, [In] ref STARTUPINFO lpStartupInfo, out PROCESS_INFORMATION lpProcessInformation);
        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        public static extern uint GetModuleFileName([In] IntPtr hModule, [Out] StringBuilder lpFilename, [In][MarshalAs(UnmanagedType.U4)] int nSize);
        [DllImport("kernel32.dll")]
        public static extern void ExitProcess(uint uExitCode);
        [DllImport("shell32.dll")]
        static extern void SHChangeNotify(HChangeNotifyEventID wEventId, HChangeNotifyFlags uFlags, IntPtr dwItem1, IntPtr dwItem2);

        [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        public static extern UInt32 WaitForSingleObject(IntPtr hHandle, UInt32 dwMilliseconds);

        /// <summary>
        /// 注册为默认PDF浏览器
        /// </summary>
        /// <param name="isDefault"></param>
        /// <returns></returns>
        public static bool RegisterDefaultApp(bool isDefault)
        {
            bool isWin8OrHigher = false;
            if (Environment.OSVersion.Version.Major > 6 || (Environment.OSVersion.Version.Major == 6 && Environment.OSVersion.Version.Minor > 1))
            {
                isWin8OrHigher = true;
            }
            try
            {
                AssemblyName assemblyName = Assembly.GetExecutingAssembly().GetName();
                /*********** register APP Path  *******************/
                RegistryKey appPathKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths", true);
                if (appPathKey == null)
                {
                    return false;
                }
                RegistryKey appKey = appPathKey.CreateSubKey(assemblyName.Name + ".exe");
                if (appKey != null)
                {
                    appKey.SetValue("", Assembly.GetExecutingAssembly().Location);
                    appKey.SetValue("Path", Directory.GetParent(assemblyName.FullName).FullName);
                    appKey.Close();
                }
                appPathKey.Close();
                /*********** register ProgID  *******************/
                RegistryKey progIdKey = Registry.ClassesRoot.CreateSubKey(assemblyName.Name + ".pdf.1");
                if (progIdKey == null)
                {
                    return false;
                }
                progIdKey.SetValue("", assemblyName.Name);
                RegistryKey openKey = progIdKey.CreateSubKey("Shell\\Open\\Command");
                openKey.SetValue("", Assembly.GetExecutingAssembly().Location + " \"%s\"  \"%1\"");
                openKey.Close();
                progIdKey.Close();
                /*********** register Default File Association  *******************/
                RegistryKey softwareKey = Registry.LocalMachine.CreateSubKey("Software\\" + assemblyName.Name);
                if (softwareKey == null)
                {
                    return false;
                }
                RegistryKey capabKey = softwareKey.CreateSubKey("Capabilities\\FileAssociations");
                capabKey.SetValue(".pdf", assemblyName.Name + ".pdf.1");
                capabKey.Close();
                capabKey = softwareKey.CreateSubKey("Capabilities", true);
                capabKey.SetValue("ApplicationDescription", assemblyName.Name);
                capabKey.Close();
                softwareKey.Close();
                /*********** register Default App List  *******************/
                RegistryKey regiserAppKeys = Registry.LocalMachine.OpenSubKey("SOFTWARE\\RegisteredApplications", true);
                if (regiserAppKeys == null)
                {
                    return false;
                }
                regiserAppKeys.SetValue(assemblyName.Name, "SOFTWARE\\" + assemblyName.Name + "\\Capabilities");
                regiserAppKeys.Close();
                Registry.ClassesRoot.SetValue(".pdf", assemblyName.Name + ".pdf.1");
                if (isDefault)
                {
                    if (isWin8OrHigher)
                    {
                        PROCESS_INFORMATION pInfo = new PROCESS_INFORMATION();
                        STARTUPINFO sInfo = new STARTUPINFO();
                        SECURITY_ATTRIBUTES pSec = new SECURITY_ATTRIBUTES();
                        SECURITY_ATTRIBUTES tSec = new SECURITY_ATTRIBUTES();
                        pSec.nLength = Marshal.SizeOf(pSec);
                        tSec.nLength = Marshal.SizeOf(tSec);
                        string commandLine = " \".pdf\" \"" + assemblyName.Name + ".pdf.1\"";
                        CreateProcess("Resources\\exe\\SFTA.exe", commandLine, ref pSec, ref tSec, false, 0, IntPtr.Zero, null, ref sInfo, out pInfo);
                        WaitForSingleObject(pInfo.hProcess, 3000);
                    }
                    else
                    {
                        RegistryKey defaultKey = Registry.CurrentUser.CreateSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\.pdf\\UserChoice", true);
                        defaultKey.SetValue("ProgId", assemblyName.Name + ".pdf.1");
                        defaultKey.Close();
                        SHChangeNotify(HChangeNotifyEventID.SHCNE_ASSOCCHANGED, HChangeNotifyFlags.SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero);
                    }
                }
                else
                {
                    RegistryKey defaultKey = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\.pdf", true);
                    RegistryKey userChoice = defaultKey.OpenSubKey("UserChoice");
                    string checkId = userChoice.GetValue("ProgId").ToString();
                    if (checkId == (assemblyName.Name + ".pdf.1") || checkId == "PDF Technologies, Inc..PDF Reader Pro")
                    {
                        defaultKey.DeleteSubKey("UserChoice");
                        SHChangeNotify(HChangeNotifyEventID.SHCNE_ASSOCCHANGED, HChangeNotifyFlags.SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero);
                    }
                    defaultKey.Close();
                }
                return true;

            }
            catch (Exception ex)
            {

            }
            return false;
        }

        /// <summary>
        /// 判断是否是默认pdf阅读器
        /// </summary>
        /// <returns></returns>
        public static bool IsDefaultApp()
        {
            try
            {
                AssemblyName assemblyName = Assembly.GetExecutingAssembly().GetName();
                var asm = Assembly.GetExecutingAssembly();
                RegistryKey defaultKey = Registry.CurrentUser.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\.pdf\\UserChoice");
                AssemblyCompanyAttribute asmcpn = (AssemblyCompanyAttribute)Attribute.GetCustomAttribute(asm, typeof(AssemblyCompanyAttribute));
                AssemblyProductAttribute aspro = (AssemblyProductAttribute)Attribute.GetCustomAttribute(asm, typeof(AssemblyProductAttribute));
                string id = string.Format("{0}.{1}", asmcpn.Company, aspro.Product);
                if (defaultKey != null)
                {
                    string checkId = defaultKey.GetValue("ProgId").ToString();
                    if (checkId == "PDF Technologies, Inc..PDF Reader Pro" || checkId == id)
                    {
                        return true;
                    }
                    defaultKey.Close();
                    if (checkId == (assemblyName.Name + ".pdf.1"))
                    {
                        return true;
                    }
                }

            }
            catch { }

            return false;
        }

        /// <summary>
        /// 判断当前程序是否以管理员身份运行
        /// </summary>
        /// <returns></returns>
        public static bool IsRunAsAdmin()
        {
            WindowsIdentity id = WindowsIdentity.GetCurrent();
            WindowsPrincipal principal = new WindowsPrincipal(id);
            return principal.IsInRole(WindowsBuiltInRole.Administrator);
        }
    }
}