using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Win32;

namespace registry
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class registryApp : Window
    {
        public registryApp()
        {
            InitializeComponent();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
//            RegistryKey r = Registry.LocalMachine; // nämä näkyvät kaikille koneen käyttäjille
            RegistryKey r = Registry.CurrentUser; // 

            rekisteri(r, treeViewRegistry);
        }
 
        // listataan rekursiivisesti koko annetun avaimen sisältö
        private void rekisteri(RegistryKey r, ItemsControl p) {
            TreeViewItem newChild = new TreeViewItem();

//            newChild.Header = r.Name;
            newChild.Header = r;
            p.Items.Add(newChild);
            
            foreach (string subkey in r.GetSubKeyNames())
            {
                try
                {
                    rekisteri(r.OpenSubKey(subkey), newChild);

                }
                catch { 
                    // kaikkiin avaimiin ei ole lukuoikeutta
                }
            }
        }

        private void treeViewRegistry_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
        {
            TreeViewItem apu = (TreeViewItem)treeViewRegistry.SelectedItem;
            RegistryKey r = (RegistryKey)apu.Header;
            listBoxRegistry.Items.Clear();
            foreach (string item in r.GetValueNames())
        	{
                listBoxRegistry.Items.Add(item + " = " + r.GetValue(item, ""));		 
	        }


        
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            RegistryKey r = Registry.CurrentUser; // 
// tänne ei ole kirjoitusoikeutta koska ei ole administratorin oikeuksia
// ohjelmien asetukset pitäisi tallentaa tänne
//            r = r.OpenSubKey("Software");
            RegistryKey jyu = r.CreateSubKey("Jyu");
            RegistryKey gko = jyu.CreateSubKey("GKO");
            gko.SetValue("Luennoija", "Tommi Lahtonen");
            gko.SetValue("OP", 6);
            gko.SetValue("URL", "http://appro.mit.jyu.fi/gko");

            treeViewRegistry.Items.Clear();
            r = Registry.CurrentUser; // 

            rekisteri(r, treeViewRegistry);
        }

        private void buttonPoista_Click(object sender, RoutedEventArgs e)
        {
            RegistryKey r = Registry.CurrentUser; // 
            try
            {
                r = r.OpenSubKey("Jyu");
                r = r.OpenSubKey("GKO", true);
                r.DeleteValue("OP");
                r.Close();

                r = Registry.CurrentUser.OpenSubKey("Jyu", true);
                r.DeleteSubKeyTree("GKO");
                r.Close();

                Registry.CurrentUser.DeleteSubKeyTree("Jyu");

            }
            catch (Exception err) {
                MessageBox.Show(err.Message);
            }
                
            treeViewRegistry.Items.Clear();
            r = Registry.CurrentUser; // 

            rekisteri(r, treeViewRegistry);

        }
    
    }
}