using System;
using System.Collections;
using System.DirectoryServices;
using System.Runtime.InteropServices;

namespace SergeyHomyuk.LocalManagement
{
    public static class LocalUtility
    {
        // Создание пользователя:
        public static void CreateLocalUser(string login, string fullName, string password)
        {
            var root = new DirectoryEntry(string.Format("WinNT://{0},computer", Environment.MachineName));
            using (var user = root.Children.Add(login, "user"))
            {
                user.Properties["FullName"].Value = fullName;
                user.Invoke("SetPassword", new object[] { password });
                user.CommitChanges();
            }
        }

        // Создание группы:
        public static void CreateLocalGroup(string name, string description)
        {
            var root = new DirectoryEntry(string.Format("WinNT://{0},computer", Environment.MachineName));
            using (var group = root.Children.Add(name, "group"))
            {
                group.Invoke("Put", new object[] { "description", description });
                group.CommitChanges();
            }
        }

        // Добавление пользователя в группу:
        public static void AddLocalUserToLocalGroup(string userName, string groupName)
        {
            string groupPath = string.Format("WinNT://{0}/{1},group", Environment.MachineName, groupName);
            string userPath = string.Format("WinNT://{0}/{1},user", Environment.MachineName, userName);
            var root = new DirectoryEntry(groupPath);
            root.Invoke("Add", new object[] { userPath });
            root.CommitChanges();
        }

        // Проверка, существует ли группа с заданным именем:
        public static bool IsLocalGroupExists(string name)
        {
            var root = new DirectoryEntry(string.Format("WinNT://{0},computer", Environment.MachineName));
            try
            {
                root.Children.Find(name, "group");
                return true;
            }
            catch (COMException e)
            {
                if (e.ErrorCode == -2147022676)
                    return false;
                throw;
            }
        }

        // Проверка, является ли пользователь членом группы:
        public static bool IsUserInLocalGroup(string userName, string groupName)
        {
            var root = new DirectoryEntry(string.Format("WinNT://{0},computer", Environment.MachineName));
            root = root.Children.Find(userName, "user");
            var groups = root.Invoke("groups");
            foreach (var group in (IEnumerable)groups)
            {
                var groupEntry = new DirectoryEntry(group);
                if (string.Equals(groupEntry.Name, groupName, StringComparison.CurrentCultureIgnoreCase))
                    return true;
            }
            return false;
        }
    }
}