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using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Diagnostics;

using System.IO;

using System.Windows.Forms;

using System.Security.AccessControl;

using System.DirectoryServices.AccountManagement;

namespace SWAT_Office_App

{

    class ManageUserAccounts

    {

        private static string studentGroupName = "StudentAccounts";

        public static List<UserPrincipal> UserAccountsList = new List<UserPrincipal>();

        public static bool AddUser(string username, string password)

        {

            try

            {

                PrincipalContext localSystem = new PrincipalContext(ContextType.Machine);

                // Creates a new user after checking if it already exists or not

                UserPrincipal newUser = new UserPrincipal(localSystem);

                newUser.Name = username;

                PrincipalSearcher searcher = new PrincipalSearcher(newUser);

                Principal result = searcher.FindOne();

                if (result == null)

                {

                    newUser = new UserPrincipal(localSystem);

                    newUser.Name = username;

                    newUser.SetPassword(password);

                    newUser.PasswordNeverExpires = true;

                    newUser.PasswordNotRequired = false;

                    newUser.UserCannotChangePassword = true;

                    newUser.Description = DateTime.Now.ToShortDateString();

                    newUser.Save();

                    // Creates a new group after checking if it already exists or not

                    GroupPrincipal studentGroup = new GroupPrincipal(localSystem);

                    studentGroup.Name = studentGroupName;

                    searcher = new PrincipalSearcher(studentGroup);

                    result = searcher.FindOne();

                    // Creates group if it doesnt already exist

                    if (result == null)

                    {

                        studentGroup = new GroupPrincipal(localSystem, studentGroupName);

                        studentGroup.Name = studentGroupName;

                        studentGroup.IsSecurityGroup = true;

                        studentGroup.Members.Add(newUser);

                        studentGroup.Save();

                    }

                    // Otherwise add to existing group

                    else

                    {

                        studentGroup = (GroupPrincipal)result;

                        studentGroup.Members.Add(newUser);

                        studentGroup.Save();

                    }

                    DebugText.appendText("Account " + username + " has been created");

                    return true;

                }

                else

                {

                    // local account already exists, return with error

                    return false;

                }

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return false;

            }

        }

        public static bool DeleteUser(List<string> usernames)

        {

            try

            {

                bool Success = true;

                PrincipalContext localSystem = new PrincipalContext(ContextType.Machine);

                // Iterates through and deletes selected users

                foreach (string user in usernames)

                {

                    bool deleteShare = false;

                    if (Directory.Exists(Settings_Form.sharedFolderLocation + @"\" + user))

                    {

                        // Prompts for deletion of folder as well as the user account

                        DialogResult result = MessageBox.Show("A shared folder exists for the user " + user + "!" +

                            "\nDelete the folder and all data within the folder?",

                           "Warning!", MessageBoxButtons.YesNo);

                        if (result == DialogResult.Yes)

                            deleteShare = true;

                    }

                    // Finds and deletes user and share

                    UserPrincipal toDelete = new UserPrincipal(localSystem);

                    toDelete.Name = user;

                    PrincipalSearcher searcher = new PrincipalSearcher(toDelete);

                    Principal found = searcher.FindOne();

                    toDelete = (UserPrincipal)found;

                    toDelete.Delete();

                    DebugText.appendText("Account " + user + " has been deleted");

                    // Deletes share if selected

                    if (deleteShare)

                        if (!DeleteShareFolder(user))

                            Success = false;

                }

                return Success;

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return false;

            }

        }

        public static bool QueryUserAccounts()

        {

            // Function that reads the user accounts on the local computer to UserAccountsList

            UserAccountsList.Clear();

            try

            {

                PrincipalContext localSystem = new PrincipalContext(ContextType.Machine);

                UserPrincipal user = new UserPrincipal(localSystem);

                user.Name = "*";

                PrincipalSearcher searcher = new PrincipalSearcher(user);

                PrincipalSearchResult<Principal> result = searcher.FindAll();

                foreach (Principal p in result)

                    UserAccountsList.Add((UserPrincipal)p);

                return true;

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return false;

            }

        }

        public static bool QueryUserSharedFolderExist(string username)

        {

            return Directory.Exists(Settings_Form.sharedFolderLocation + @"\" + username);

        }

        public static bool CreateShareFolder(string username)

        {

            try

            {

                // Creates the directory with only the specific NTFS and share permissions for the user.

                DirectorySecurity dSecurity = new DirectorySecurity();

                // Adds NTFS permissions for system accounts

                foreach (string systemUser in Settings_Form.systemAccounts)

                {

                    dSecurity.AddAccessRule(new FileSystemAccessRule("\\" + systemUser, FileSystemRights.FullControl, InheritanceFlags.ContainerInherit, PropagationFlags.None, AccessControlType.Allow));

                    dSecurity.AddAccessRule(new FileSystemAccessRule("\\" + systemUser, FileSystemRights.FullControl, InheritanceFlags.ObjectInherit, PropagationFlags.None, AccessControlType.Allow));

                }

                // Adds NTFS permissions for the user

                dSecurity.AddAccessRule(new FileSystemAccessRule("\\" + username, FileSystemRights.FullControl, InheritanceFlags.ContainerInherit, PropagationFlags.None, AccessControlType.Allow));

                dSecurity.AddAccessRule(new FileSystemAccessRule("\\" + username, FileSystemRights.FullControl, InheritanceFlags.ObjectInherit, PropagationFlags.None, AccessControlType.Allow));

                Directory.CreateDirectory(Settings_Form.sharedFolderLocation + @"\" + username, dSecurity);

                DebugText.appendText("Shared folder for " + username + " has been created");

                return SetSharePermissions(username);

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return false;

            }

        }

        public static bool DeleteShareFolder(string username)

        {

            try

            {

                bool Success = true;

                // Removes the share BEFORE deleting the folder. Otherwise share will error on remove.

                if (!RemoveSharePermissions(username))

                    Success = false;

                Directory.Delete(Settings_Form.sharedFolderLocation + @"\" + username, true);

                DebugText.appendText("Shared folder for " + username + " has been deleted");

                return Success;

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return false;

            }

        }

        public static bool ToggleShare(string username)

        {

            try

            {

                // Checks if a share already exists for the user

                if (Directory.Exists(Settings_Form.sharedFolderLocation + @"\" + username))

                {

                    DialogResult result = MessageBox.Show("A shared folder exists for the user " + username + "!" +

                                "\nDelete the folder and all data within the folder?",

                               "Warning!", MessageBoxButtons.YesNo);

                    if (result == DialogResult.Yes)

                        return DeleteShareFolder(username);

                }

                // Otherwise creates the share for the user

                else

                    return CreateShareFolder(username);

                return true;

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return false;

            }

        }

        public static long GetShareSize(string username)

        {

            DirectoryInfo dir = new DirectoryInfo(Settings_Form.sharedFolderLocation + @"\" + username);

            long size = GetDirSize(dir);

            return size;

        }

        private static long GetDirSize(DirectoryInfo input)

        {

            try

            {

                if (input.Exists)

                {

                    long size = 0;

                    FileInfo[] files = input.GetFiles();

                    foreach (FileInfo file in files)

                    {

                        size += file.Length;

                    }

                    DirectoryInfo[] dirs = input.GetDirectories();

                    foreach (DirectoryInfo dir in dirs)

                    {

                        size += GetDirSize(dir);

                    }

                    return size;

                }

                else 

                    return 0;

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return 0;

            }

        }

        public static bool ChangeUserPassword(string username, string password)

        {

            try

            {

                // Queries for the specified user password

                PrincipalContext localSystem = new PrincipalContext(ContextType.Machine);

                UserPrincipal user = new UserPrincipal(localSystem);

                user.Name = username;

                PrincipalSearcher searcher = new PrincipalSearcher(user);

                Principal result = searcher.FindOne();

                user = (UserPrincipal)result;

                user.SetPassword(password);

                user.Save();

                DebugText.appendText("Password for " + username + " has been changed");

                return true;

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return false;

            }

        }

        public static bool SessionsOpen()

        {

            try

            {

                Process netProcess = new Process();

                netProcess.StartInfo.WorkingDirectory = System.Environment.SystemDirectory;

                netProcess.StartInfo.FileName = "net.exe";

                netProcess.StartInfo.UseShellExecute = false;

                netProcess.StartInfo.RedirectStandardOutput = true;

                netProcess.StartInfo.CreateNoWindow = true;

                netProcess.StartInfo.Arguments = "SESSION";

                netProcess.Start();

                string netOutput = netProcess.StandardOutput.ReadToEnd();

                // Splits the output into seperate strings for further processing

                string[] tempSplit = netOutput.Split(new string[] { "  ", "\r", "\n" }, StringSplitOptions.RemoveEmptyEntries);

                netProcess.WaitForExit();

                netProcess.Close();

                if (tempSplit[0] == "There are no entries in the list.")

                    return false;

                else

                    return true;

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return true;

            }

        }

        private static bool SetSharePermissions(string username)

        {

            string combinationString = "";

            foreach (string systemUser in Settings_Form.systemAccounts)

            {

                combinationString = combinationString.Insert(combinationString.Length, " /GRANT:\"" + systemUser + "\",FULL");

            }

            combinationString = combinationString.Insert(combinationString.Length, " /GRANT:\"" + username + "\",FULL");

            try

            {

                Process netProcess = new Process();

                netProcess.StartInfo.WorkingDirectory = System.Environment.SystemDirectory;

                netProcess.StartInfo.FileName = "net.exe";

                netProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

                netProcess.StartInfo.CreateNoWindow = true;

                netProcess.StartInfo.Arguments = "SHARE \"" + username + "\"=\"" + Settings_Form.sharedFolderLocation + "\\" + username + "\" " + combinationString;

                netProcess.Start();

                netProcess.WaitForExit();

                netProcess.Close();

                DebugText.appendText("Share permissions for " + username + " has been set");

                return true;

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return false;

            }

        }

        private static bool RemoveSharePermissions(string username)

        {

            try

            {

                Process netProcess = new Process();

                netProcess.StartInfo.WorkingDirectory = System.Environment.SystemDirectory;

                netProcess.StartInfo.FileName = "net.exe";

                netProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

                netProcess.StartInfo.CreateNoWindow = true;

                netProcess.StartInfo.Arguments = "SHARE \"" + username + "\" /Delete";

                netProcess.Start();

                netProcess.WaitForExit();

                netProcess.Close();

                DebugText.appendText("Share permissions for " + username + " has been removed");

                return true;

            }

            catch (Exception e)

            {

                //MessageBox.Show(e.ToString(), "Error");

                DebugText.appendText(e.ToString());

                MessageBox.Show("An error has occured. Please notify a supervisor to debug.", "Error");

                return false;

            }

        }

    }

}