using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Win32;

namespace NX_Installation
{
    class CreateReadWriteDeleteRegistry
    {
        // Create a Subkey
        public string MainKey { get; set; }
        public string SubKey { get; set; }
        public string Key { get; set; }
        public string Value { get; set; }
        public bool Error { get; set; }

        public void WriteSubkey()
        {
            // Write Values to the Subkey
            RegistryKey newKey = Registry.CurrentUser.CreateSubKey(SubKey);
            newKey.SetValue(Key, Value);
        }

        public string ReadSubkey()
        {
            // Read Values from the Subkey
            if (SubKeyExist(SubKey))
            {
                RegistryKey myKey = Registry.CurrentUser.OpenSubKey(SubKey);
                return (string)myKey.GetValue(Key);
            }
            else
            {
                throw new Exception("Subkey does not exist!");
            }
        }

        public void DeleteSubkey()
        {
            // Delete the Subkey
            MainKey = SubKey.Remove(SubKey.LastIndexOf('\\'));

            if (SubKeyExist(MainKey))
            {
                Registry.CurrentUser.DeleteSubKeyTree(MainKey);
            }
            else
            {
                throw new Exception("Subkey does not exist!");
            }
        }

        public bool SubKeyExist(string Subkey)
        {
            // Check if a Subkey exist
            RegistryKey myKey = Registry.CurrentUser.OpenSubKey(Subkey);
            if (myKey == null)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
    }
}