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

namespace HRM.BO
{
    public class FileAccessWithImpersonation
    {


        //#region Declaration

        //string userName = string.Empty;// "chapal" ;
        //string domain = string.Empty;// "CEL";
        //string password = string.Empty;// "cpl!@#45";
        //                               //string target = string.Empty;// @"\\CEL02\d$\Images\";

        ///// <summary>
        ///// This is 9 if There is No Domain Defined and 2 otherwise
        ///// </summary>
        //public const int LOGON32_LOGON_INTERACTIVE = 9; //2;

        ///// <summary>
        ///// This is 3 if There is No Domain Defined and 0 otherwise
        ///// </summary>
        //public const int LOGON32_PROVIDER_DEFAULT = 3;//0;
        //WindowsImpersonationContext impersonationContext;

        //#endregion

        //#region Functions

        //[DllImport("advapi32.dll")]
        //public static extern int LogonUserA(String lpszUserName,
        //    String lpszDomain,
        //    String lpszPassword,
        //    int dwLogonType,
        //    int dwLogonProvider,
        //    ref IntPtr phToken);
        //[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        //public static extern int DuplicateToken(IntPtr hToken,
        //    int impersonationLevel,
        //    ref IntPtr hNewToken);

        //[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        //public static extern bool RevertToSelf();

        //[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
        //public static extern bool CloseHandle(IntPtr handle);


        //private bool impersonateValidUser()
        //{
        //    WindowsIdentity tempWindowsIdentity;
        //    IntPtr token = IntPtr.Zero;
        //    IntPtr tokenDuplicate = IntPtr.Zero;

        //    domain = Ease.CoreV35.Utility.ConfigUtility.GetAppSettings("ADDomain");
        //    userName = Ease.CoreV35.Utility.ConfigUtility.GetAppSettings("ADUser");
        //    password = Ease.CoreV35.Utility.ConfigUtility.GetAppSettings("ADPassword");
        //    password = Ease.CoreV35.Utility.Global.CipherFunctions.Decrypt("Cel.Admin", password);

        //    if (RevertToSelf())
        //    {
        //        if (LogonUserA(userName, domain, password, LOGON32_LOGON_INTERACTIVE,
        //            LOGON32_PROVIDER_DEFAULT, ref token) != 0)
        //        {
        //            if (DuplicateToken(token, 2, ref tokenDuplicate) != 0)
        //            {
        //                tempWindowsIdentity = new WindowsIdentity(tokenDuplicate);
        //                impersonationContext = tempWindowsIdentity.Impersonate();
        //                if (impersonationContext != null)
        //                {
        //                    CloseHandle(token);
        //                    CloseHandle(tokenDuplicate);
        //                    return true;
        //                }
        //            }
        //        }
        //    }
        //    if (token != IntPtr.Zero)
        //        CloseHandle(token);
        //    if (tokenDuplicate != IntPtr.Zero)
        //        CloseHandle(tokenDuplicate);
        //    return false;
        //}

        //private void undoImpersonation()
        //{
        //    if (impersonationContext != null)
        //        impersonationContext.Undo();
        //}

        //public void UploadFile(string TargetFolder, string FullFilePath, string NewFileName)
        //{
        //    //System.IO.FileStream fs = null;
        //    //fs = System.IO.File.Open(FullFilePath , System.IO.FileMode.Open);
        //    //byte[]  bytes = new byte[fs.Length];
        //    //fs.Read(bytes , 0 , Convert.ToInt32(fs.Length));
        //    byte[] bytes = File.ReadAllBytes(FullFilePath);
        //    try
        //    {
        //        if (impersonateValidUser())
        //        {
        //            //string[] Files = Directory.GetFiles(TargetFolder);
        //            string fullTargetPath = TargetFolder + "\\" + NewFileName;
        //            File.WriteAllBytes(fullTargetPath, bytes);

        //        }
        //    }
        //    finally
        //    {
        //        undoImpersonation();
        //    }

        //}

        //public byte[] GetFileInBytes(string SourceFolder, string FileName)
        //{
        //    byte[] bytes = null;
        //    try
        //    {
        //        if (impersonateValidUser())
        //        {
        //            string fullSourcePath = SourceFolder + "\\" + FileName;
        //            if (File.Exists(fullSourcePath))
        //            {
        //                bytes = File.ReadAllBytes(fullSourcePath);
        //            }

        //        }
        //    }
        //    finally
        //    {
        //        undoImpersonation();
        //    }

        //    return bytes;
        //}

        //#endregion

    }
}