/*

  This Source Code Form is subject to the terms of the Mozilla Public

  License, v. 2.0. If a copy of the MPL was not distributed with this

  file, You can obtain one at http://mozilla.org/MPL/2.0/.

  Copyright (C) 2009-2012 Michael Möller <mmoeller@openhardwaremonitor.org>

	Copyright (C) 2010 Paul Werelds <paul@werelds.net>

	Copyright (C) 2012 Prince Samuel <prince.samuel@gmail.com>

*/

using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.ComponentModel;

using System.Drawing;

using System.IO;

using System.Reflection;

using System.Windows.Forms;

using Aga.Controls.Tree;

using Aga.Controls.Tree.NodeControls;

using OpenHardwareMonitor.Hardware;

using OpenHardwareMonitor.WMI;

using OpenHardwareMonitor.Utilities;

namespace OpenHardwareMonitor.GUI {

  public partial class MainForm : Form {

    private PersistentSettings settings;

    private UnitManager unitManager;

    private Computer computer;

    private Node root;

    private TreeModel treeModel;

    private IDictionary<ISensor, Color> sensorPlotColors = 

      new Dictionary<ISensor, Color>();

    private Color[] plotColorPalette;

    private SystemTray systemTray;    

    private StartupManager startupManager = new StartupManager();

    private UpdateVisitor updateVisitor = new UpdateVisitor();

    private SensorGadget gadget;

    private Form plotForm;

    private PlotPanel plotPanel;

    private UserOption showHiddenSensors;

    private UserOption showPlot;

    private UserOption showValue;

    private UserOption showMin;

    private UserOption showMax;

    private UserOption startMinimized;

    private UserOption minimizeToTray;

    private UserOption minimizeOnClose;

    private UserOption autoStart;

    private UserOption readMainboardSensors;

    private UserOption readCpuSensors;

    private UserOption readRamSensors;

    private UserOption readGpuSensors;

    private UserOption readFanControllersSensors;

    private UserOption readHddSensors;

    private UserOption showGadget;

    private UserRadioGroup plotLocation;

    private WmiProvider wmiProvider;

    private UserOption runWebServer;

    private HttpServer server;

    private bool selectionDragging = false;

    public MainForm() {      

      InitializeComponent();

      // check if the OpenHardwareMonitorLib assembly has the correct version

      if (Assembly.GetAssembly(typeof(Computer)).GetName().Version !=

        Assembly.GetExecutingAssembly().GetName().Version) {

        MessageBox.Show(

          "The version of the file OpenHardwareMonitorLib.dll is incompatible.",

          "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

        Environment.Exit(0);

      }

      this.settings = new PersistentSettings();      

      this.settings.Load(Path.ChangeExtension(

        Application.ExecutablePath, ".config"));

      this.unitManager = new UnitManager(settings);

      // make sure the buffers used for double buffering are not disposed 

      // after each draw call

      BufferedGraphicsManager.Current.MaximumBuffer =

        Screen.PrimaryScreen.Bounds.Size;  

      // set the DockStyle here, to avoid conflicts with the MainMenu

      this.splitContainer.Dock = DockStyle.Fill;

      this.Font = SystemFonts.MessageBoxFont;

      treeView.Font = SystemFonts.MessageBoxFont;

      plotPanel = new PlotPanel(settings);

      plotPanel.Font = SystemFonts.MessageBoxFont;

      plotPanel.Dock = DockStyle.Fill;

      nodeCheckBox.IsVisibleValueNeeded += nodeCheckBox_IsVisibleValueNeeded;

      nodeTextBoxText.DrawText += nodeTextBoxText_DrawText;

      nodeTextBoxValue.DrawText += nodeTextBoxText_DrawText;

      nodeTextBoxMin.DrawText += nodeTextBoxText_DrawText;

      nodeTextBoxMax.DrawText += nodeTextBoxText_DrawText;

      nodeTextBoxText.EditorShowing += nodeTextBoxText_EditorShowing;

      foreach (TreeColumn column in treeView.Columns) 

        column.Width = Math.Max(20, Math.Min(400,

          settings.GetValue("treeView.Columns." + column.Header + ".Width",

          column.Width)));

      treeModel = new TreeModel();

      root = new Node(System.Environment.MachineName);

      root.Image = Utilities.EmbeddedResources.GetImage("computer.png");

      treeModel.Nodes.Add(root);

      treeView.Model = treeModel;

      this.computer = new Computer(settings);

      systemTray = new SystemTray(computer, settings, unitManager);

      systemTray.HideShowCommand += hideShowClick;

      systemTray.ExitCommand += exitClick;

      int p = (int)Environment.OSVersion.Platform;

      if ((p == 4) || (p == 128)) { // Unix

        treeView.RowHeight = Math.Max(treeView.RowHeight, 18); 

        splitContainer.BorderStyle = BorderStyle.None;

        splitContainer.Border3DStyle = Border3DStyle.Adjust;

        splitContainer.SplitterWidth = 4;

        treeView.BorderStyle = BorderStyle.Fixed3D;

        plotPanel.BorderStyle = BorderStyle.Fixed3D;

        gadgetMenuItem.Visible = false;

        minCloseMenuItem.Visible = false;

        minTrayMenuItem.Visible = false;

        startMinMenuItem.Visible = false;

      } else { // Windows

        treeView.RowHeight = Math.Max(treeView.Font.Height + 1, 18); 

        gadget = new SensorGadget(computer, settings, unitManager);

        gadget.HideShowCommand += hideShowClick;

        wmiProvider = new WmiProvider(computer);

      }

      plotColorPalette = new Color[13];

      plotColorPalette[0] = Color.Blue;

      plotColorPalette[1] = Color.OrangeRed;

      plotColorPalette[2] = Color.Green;

      plotColorPalette[3] = Color.LightSeaGreen;

      plotColorPalette[4] = Color.Goldenrod;

      plotColorPalette[5] = Color.DarkViolet;

      plotColorPalette[6] = Color.YellowGreen;

      plotColorPalette[7] = Color.SaddleBrown;

      plotColorPalette[8] = Color.RoyalBlue;

      plotColorPalette[9] = Color.DeepPink;

      plotColorPalette[10] = Color.MediumSeaGreen;

      plotColorPalette[11] = Color.Olive;

      plotColorPalette[12] = Color.Firebrick;

      computer.HardwareAdded += new HardwareEventHandler(HardwareAdded);

      computer.HardwareRemoved += new HardwareEventHandler(HardwareRemoved);        

      computer.Open();

      timer.Enabled = true;

      showHiddenSensors = new UserOption("hiddenMenuItem", false,

        hiddenMenuItem, settings);

      showHiddenSensors.Changed += delegate(object sender, EventArgs e) {

        treeModel.ForceVisible = showHiddenSensors.Value;

      };

      showValue = new UserOption("valueMenuItem", true, valueMenuItem,

        settings);

      showValue.Changed += delegate(object sender, EventArgs e) {

        treeView.Columns[1].IsVisible = showValue.Value;

      };

      showMin = new UserOption("minMenuItem", false, minMenuItem, settings);

      showMin.Changed += delegate(object sender, EventArgs e) {

        treeView.Columns[2].IsVisible = showMin.Value;

      };

      showMax = new UserOption("maxMenuItem", true, maxMenuItem, settings);

      showMax.Changed += delegate(object sender, EventArgs e) {

        treeView.Columns[3].IsVisible = showMax.Value;

      };

      startMinimized = new UserOption("startMinMenuItem", false,

        startMinMenuItem, settings);

      minimizeToTray = new UserOption("minTrayMenuItem", true,

        minTrayMenuItem, settings);

      minimizeToTray.Changed += delegate(object sender, EventArgs e) {

        systemTray.IsMainIconEnabled = minimizeToTray.Value;

      };

      minimizeOnClose = new UserOption("minCloseMenuItem", false,

        minCloseMenuItem, settings);

      autoStart = new UserOption(null, startupManager.Startup,

        startupMenuItem, settings);

      autoStart.Changed += delegate(object sender, EventArgs e) {

        try {

          startupManager.Startup = autoStart.Value;

        } catch (InvalidOperationException) {

          MessageBox.Show("Updating the auto-startup option failed.", "Error", 

            MessageBoxButtons.OK, MessageBoxIcon.Error);

          autoStart.Value = startupManager.Startup;

        }

      };

      readMainboardSensors = new UserOption("mainboardMenuItem", true, 

        mainboardMenuItem, settings);

      readMainboardSensors.Changed += delegate(object sender, EventArgs e) {

        computer.MainboardEnabled = readMainboardSensors.Value;

      };

      readCpuSensors = new UserOption("cpuMenuItem", true,

        cpuMenuItem, settings);

      readCpuSensors.Changed += delegate(object sender, EventArgs e) {

        computer.CPUEnabled = readCpuSensors.Value;

      };

      readRamSensors = new UserOption("ramMenuItem", true,

        ramMenuItem, settings);

      readRamSensors.Changed += delegate(object sender, EventArgs e) {

        computer.RAMEnabled = readRamSensors.Value;

      };

      readGpuSensors = new UserOption("gpuMenuItem", true,

        gpuMenuItem, settings);

      readGpuSensors.Changed += delegate(object sender, EventArgs e) {

        computer.GPUEnabled = readGpuSensors.Value;

      };

      readFanControllersSensors = new UserOption("fanControllerMenuItem", true,

        fanControllerMenuItem, settings);

      readFanControllersSensors.Changed += delegate(object sender, EventArgs e) {

        computer.FanControllerEnabled = readFanControllersSensors.Value;

      };

      readHddSensors = new UserOption("hddMenuItem", true, hddMenuItem,

        settings);

      readHddSensors.Changed += delegate(object sender, EventArgs e) {

        computer.HDDEnabled = readHddSensors.Value;

      };

      showGadget = new UserOption("gadgetMenuItem", false, gadgetMenuItem,

        settings);

      showGadget.Changed += delegate(object sender, EventArgs e) {

        if (gadget != null) 

          gadget.Visible = showGadget.Value;

      };

      celsiusMenuItem.Checked = 

        unitManager.TemperatureUnit == TemperatureUnit.Celsius;

      fahrenheitMenuItem.Checked = !celsiusMenuItem.Checked;

      server = new HttpServer(root, this.settings.GetValue("listenerPort", 8085));

      runWebServer = new UserOption("runWebServerMenuItem", false,

        runWebServerMenuItem, settings);

      runWebServer.Changed += delegate(object sender, EventArgs e) {

        if (runWebServer.Value)

          runWebServer.Value = server.startHTTPListener();

        else

          server.stopHTTPListener();

      };

      InitializePlotForm();

      startupMenuItem.Visible = startupManager.IsAvailable;

      if (startMinMenuItem.Checked) {

        if (!minTrayMenuItem.Checked) {

          WindowState = FormWindowState.Minimized;

          Show();

        }

      } else {

        Show();

      }

      // Create a handle, otherwise calling Close() does not fire FormClosed     

      IntPtr handle = Handle;

      // Make sure the settings are saved when the user logs off

      Microsoft.Win32.SystemEvents.SessionEnded += delegate {

        SaveConfiguration();

        if (runWebServer.Value) 

            server.Quit();

      };

    }

    private void InitializePlotForm() {

      plotForm = new Form();

      plotForm.FormBorderStyle = FormBorderStyle.SizableToolWindow;

      plotForm.ShowInTaskbar = false;

      plotForm.StartPosition = FormStartPosition.Manual;

      this.AddOwnedForm(plotForm);

      plotForm.Bounds = new Rectangle {

        X = settings.GetValue("plotForm.Location.X", -100000),

        Y = settings.GetValue("plotForm.Location.Y", 100),

        Width = settings.GetValue("plotForm.Width", 600),

        Height = settings.GetValue("plotForm.Height", 400)

      };

      showPlot = new UserOption("plotMenuItem", false, plotMenuItem, settings);

      plotLocation = new UserRadioGroup("plotLocation", 0,

        new[] { plotWindowMenuItem, plotBottomMenuItem, plotRightMenuItem },

        settings);

      showPlot.Changed += delegate(object sender, EventArgs e) {

        if (plotLocation.Value == 0) {

          if (showPlot.Value && this.Visible)

            plotForm.Show();

          else

            plotForm.Hide();

        } else {

          splitContainer.Panel2Collapsed = !showPlot.Value;

        }

        treeView.Invalidate();

      };

      plotLocation.Changed += delegate(object sender, EventArgs e) {

        switch (plotLocation.Value) {

          case 0:

            splitContainer.Panel2.Controls.Clear();

            splitContainer.Panel2Collapsed = true;

            plotForm.Controls.Add(plotPanel);

            if (showPlot.Value && this.Visible)

              plotForm.Show();

            break;

          case 1:

            plotForm.Controls.Clear();

            plotForm.Hide();

            splitContainer.Orientation = Orientation.Horizontal;

            splitContainer.Panel2.Controls.Add(plotPanel);

            splitContainer.Panel2Collapsed = !showPlot.Value;

            break;

          case 2:

            plotForm.Controls.Clear();

            plotForm.Hide();

            splitContainer.Orientation = Orientation.Vertical;

            splitContainer.Panel2.Controls.Add(plotPanel);

            splitContainer.Panel2Collapsed = !showPlot.Value;

            break;

        }

      };

      plotForm.FormClosing += delegate(object sender, FormClosingEventArgs e) {

        if (e.CloseReason == CloseReason.UserClosing) {

          // just switch off the plotting when the user closes the form

          if (plotLocation.Value == 0) {

            showPlot.Value = false;

          }

          e.Cancel = true;

        }

      };

      EventHandler moveOrResizePlotForm = delegate(object sender, EventArgs e) {

        if (plotForm.WindowState != FormWindowState.Minimized) {

          settings.SetValue("plotForm.Location.X", plotForm.Bounds.X);

          settings.SetValue("plotForm.Location.Y", plotForm.Bounds.Y);

          settings.SetValue("plotForm.Width", plotForm.Bounds.Width);

          settings.SetValue("plotForm.Height", plotForm.Bounds.Height);

        }

      };

      plotForm.Move += moveOrResizePlotForm;

      plotForm.Resize += moveOrResizePlotForm;

      plotForm.VisibleChanged += delegate(object sender, EventArgs e) {

        Rectangle bounds = new Rectangle(plotForm.Location, plotForm.Size);

        Screen screen = Screen.FromRectangle(bounds);

        Rectangle intersection =

          Rectangle.Intersect(screen.WorkingArea, bounds);

        if (intersection.Width < Math.Min(16, bounds.Width) ||

            intersection.Height < Math.Min(16, bounds.Height)) {

          plotForm.Location = new Point(

            screen.WorkingArea.Width / 2 - bounds.Width / 2,

            screen.WorkingArea.Height / 2 - bounds.Height / 2);

        }

      };

      this.VisibleChanged += delegate(object sender, EventArgs e) {

        if (this.Visible && showPlot.Value && plotLocation.Value == 0)

          plotForm.Show();

        else

          plotForm.Hide();

      };

    }

    private void InsertSorted(Collection<Node> nodes, HardwareNode node) {

      int i = 0;

      while (i < nodes.Count && nodes[i] is HardwareNode &&

        ((HardwareNode)nodes[i]).Hardware.HardwareType < 

          node.Hardware.HardwareType)

        i++;

      nodes.Insert(i, node);

    }

    private void SubHardwareAdded(IHardware hardware, Node node) {

      HardwareNode hardwareNode = 

        new HardwareNode(hardware, settings, unitManager);

      hardwareNode.PlotSelectionChanged += PlotSelectionChanged;

      InsertSorted(node.Nodes, hardwareNode);

      foreach (IHardware subHardware in hardware.SubHardware)

        SubHardwareAdded(subHardware, hardwareNode);  

    }

    private void HardwareAdded(IHardware hardware) {      

      SubHardwareAdded(hardware, root);

      PlotSelectionChanged(this, null);

    }

    private void HardwareRemoved(IHardware hardware) {

      List<HardwareNode> nodesToRemove = new List<HardwareNode>();

      foreach (Node node in root.Nodes) {

        HardwareNode hardwareNode = node as HardwareNode;

        if (hardwareNode != null && hardwareNode.Hardware == hardware)

          nodesToRemove.Add(hardwareNode);

      }

      foreach (HardwareNode hardwareNode in nodesToRemove) {

        root.Nodes.Remove(hardwareNode);

        hardwareNode.PlotSelectionChanged -= PlotSelectionChanged;

      }

      PlotSelectionChanged(this, null);

    }

    private void nodeTextBoxText_DrawText(object sender, DrawEventArgs e) {       

      Node node = e.Node.Tag as Node;

      if (node != null) {

        Color color;

        if (node.IsVisible) {

          SensorNode sensorNode = node as SensorNode;

          if (plotMenuItem.Checked && sensorNode != null &&

            sensorPlotColors.TryGetValue(sensorNode.Sensor, out color))

            e.TextColor = color;

        } else {

          e.TextColor = Color.DarkGray;

        }

      }

    }

    private void PlotSelectionChanged(object sender, EventArgs e) {

      List<ISensor> selected = new List<ISensor>();

      IDictionary<ISensor, Color> colors = new Dictionary<ISensor, Color>();

      int colorIndex = 0;

      foreach (TreeNodeAdv node in treeView.AllNodes) {

        SensorNode sensorNode = node.Tag as SensorNode;

        if (sensorNode != null &&

          sensorNode.Sensor.SensorType == SensorType.Temperature) {

          if (sensorNode.Plot) {

            colors.Add(sensorNode.Sensor,

              plotColorPalette[colorIndex % plotColorPalette.Length]);

            selected.Add(sensorNode.Sensor);

          }

          colorIndex++;

        }

      }

      sensorPlotColors = colors;

      plotPanel.SetSensors(selected, colors);

    }

    private void nodeTextBoxText_EditorShowing(object sender,

      CancelEventArgs e) 

    {

      e.Cancel = !(treeView.CurrentNode != null &&

        (treeView.CurrentNode.Tag is SensorNode || 

         treeView.CurrentNode.Tag is HardwareNode));

    }

    private void nodeCheckBox_IsVisibleValueNeeded(object sender, 

      NodeControlValueEventArgs e) {

      SensorNode node = e.Node.Tag as SensorNode;

      e.Value = (node != null) && 

        (node.Sensor.SensorType == SensorType.Temperature) && 

        plotMenuItem.Checked;

    }

    private void exitClick(object sender, EventArgs e) {

      Close();

    }

    private void timer_Tick(object sender, EventArgs e) {

      computer.Accept(updateVisitor);

      treeView.Invalidate();

      plotPanel.Invalidate();

      systemTray.Redraw();

      if (gadget != null)

        gadget.Redraw();

      if (wmiProvider != null)

        wmiProvider.Update();

    }

    private void SaveConfiguration() {

      foreach (TreeColumn column in treeView.Columns)

        settings.SetValue("treeView.Columns." + column.Header + ".Width",

          column.Width);

      this.settings.SetValue("listenerPort", server.ListenerPort);

      string fileName = Path.ChangeExtension(

          System.Windows.Forms.Application.ExecutablePath, ".config");

      try {

        settings.Save(fileName);

      } catch (UnauthorizedAccessException) {

        MessageBox.Show("Access to the path '" + fileName + "' is denied. " +

          "The current settings could not be saved.",

          "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

      } catch (IOException) {

        MessageBox.Show("The path '" + fileName + "' is not writeable. " +

          "The current settings could not be saved.",

          "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

      }

    }

    private void MainForm_Load(object sender, EventArgs e) {

      Rectangle newBounds = new Rectangle {

        X = settings.GetValue("mainForm.Location.X", Location.X),

        Y = settings.GetValue("mainForm.Location.Y", Location.Y),

        Width = settings.GetValue("mainForm.Width", 470),

        Height = settings.GetValue("mainForm.Height", 640)

      };

      Rectangle fullWorkingArea = new Rectangle(int.MaxValue, int.MaxValue,

        int.MinValue, int.MinValue);

      foreach (Screen screen in Screen.AllScreens)

        fullWorkingArea = Rectangle.Union(fullWorkingArea, screen.Bounds);

      Rectangle intersection = Rectangle.Intersect(fullWorkingArea, newBounds);

      if (intersection.Width < 20 || intersection.Height < 20 ||

        !settings.Contains("mainForm.Location.X")

      ) {

        newBounds.X = (Screen.PrimaryScreen.WorkingArea.Width / 2) -

                      (newBounds.Width/2);

        newBounds.Y = (Screen.PrimaryScreen.WorkingArea.Height / 2) -

                      (newBounds.Height / 2);

      }

      this.Bounds = newBounds;

    }

    private void MainForm_FormClosed(object sender, FormClosedEventArgs e) {

      Visible = false;      

      systemTray.IsMainIconEnabled = false;

      timer.Enabled = false;            

      computer.Close();

      SaveConfiguration();

      if (runWebServer.Value)

          server.Quit();

      systemTray.Dispose();

    }

    private void aboutMenuItem_Click(object sender, EventArgs e) {

      new AboutBox().ShowDialog();

    }

    private void treeView_Click(object sender, EventArgs e) {

      MouseEventArgs m = e as MouseEventArgs;

      if (m == null || m.Button != MouseButtons.Right)

        return;

      NodeControlInfo info = treeView.GetNodeControlInfoAt(

        new Point(m.X, m.Y)

      );

      treeView.SelectedNode = info.Node;

      if (info.Node != null) {

        SensorNode node = info.Node.Tag as SensorNode;

        if (node != null && node.Sensor != null) {

          treeContextMenu.MenuItems.Clear();

          if (node.Sensor.Parameters.Length > 0) {

            MenuItem item = new MenuItem("Parameters...");

            item.Click += delegate(object obj, EventArgs args) {

              ShowParameterForm(node.Sensor);

            };

            treeContextMenu.MenuItems.Add(item);

          }

          if (nodeTextBoxText.EditEnabled) {

            MenuItem item = new MenuItem("Rename");

            item.Click += delegate(object obj, EventArgs args) {

              nodeTextBoxText.BeginEdit();

            };

            treeContextMenu.MenuItems.Add(item);

          }

          if (node.IsVisible) {

            MenuItem item = new MenuItem("Hide");

            item.Click += delegate(object obj, EventArgs args) {

              node.IsVisible = false;

            };

            treeContextMenu.MenuItems.Add(item);

          } else {

            MenuItem item = new MenuItem("Unhide");

            item.Click += delegate(object obj, EventArgs args) {

              node.IsVisible = true;

            };

            treeContextMenu.MenuItems.Add(item);

          }

          treeContextMenu.MenuItems.Add(new MenuItem("-"));

          {

            MenuItem item = new MenuItem("Show in Tray");

            item.Checked = systemTray.Contains(node.Sensor);

            item.Click += delegate(object obj, EventArgs args) {

              if (item.Checked)

                systemTray.Remove(node.Sensor);

              else

                systemTray.Add(node.Sensor, true);

            };

            treeContextMenu.MenuItems.Add(item);

          }

          if (gadget != null) {

            MenuItem item = new MenuItem("Show in Gadget");

            item.Checked = gadget.Contains(node.Sensor);

            item.Click += delegate(object obj, EventArgs args) {

              if (item.Checked) {

                gadget.Remove(node.Sensor);

              } else {

                gadget.Add(node.Sensor);

              }

            };

            treeContextMenu.MenuItems.Add(item);

          }

          if (node.Sensor.Control != null) {

            treeContextMenu.MenuItems.Add(new MenuItem("-"));

            IControl control = node.Sensor.Control;

            MenuItem controlItem = new MenuItem("Control");

            MenuItem defaultItem = new MenuItem("Default");

            defaultItem.Checked = control.ControlMode == ControlMode.Default;

            controlItem.MenuItems.Add(defaultItem);

            defaultItem.Click += delegate(object obj, EventArgs args) {

              control.SetDefault();

            };

            MenuItem manualItem = new MenuItem("Manual");

            controlItem.MenuItems.Add(manualItem);

            manualItem.Checked = control.ControlMode == ControlMode.Software;

            for (int i = 0; i <= 100; i += 5) {

              if (i <= control.MaxSoftwareValue &&

                  i >= control.MinSoftwareValue) {

                MenuItem item = new MenuItem(i + " %");

                manualItem.MenuItems.Add(item);

                item.Checked = control.ControlMode == ControlMode.Software &&

                  Math.Round(control.SoftwareValue) == i;

                int softwareValue = i;

                item.Click += delegate(object obj, EventArgs args) {

                  control.SetSoftware(softwareValue);

                };

              }

            }

            treeContextMenu.MenuItems.Add(controlItem);

          }

          treeContextMenu.Show(treeView, new Point(m.X, m.Y));

        }

        HardwareNode hardwareNode = info.Node.Tag as HardwareNode;

        if (hardwareNode != null && hardwareNode.Hardware != null) {

          treeContextMenu.MenuItems.Clear();

          if (nodeTextBoxText.EditEnabled) {

            MenuItem item = new MenuItem("Rename");

            item.Click += delegate(object obj, EventArgs args) {

              nodeTextBoxText.BeginEdit();

            };

            treeContextMenu.MenuItems.Add(item);

          }

          treeContextMenu.Show(treeView, new Point(m.X, m.Y));

        }

      }

    }

    private void saveReportMenuItem_Click(object sender, EventArgs e) {

      string report = computer.GetReport();

      if (saveFileDialog.ShowDialog() == DialogResult.OK) {

        using (TextWriter w = new StreamWriter(saveFileDialog.FileName)) {

          w.Write(report);

        }

      }

    }

    private void SysTrayHideShow() {

      Visible = !Visible;

      if (Visible)

        Activate();    

    }

    protected override void WndProc(ref Message m) {

      const int WM_SYSCOMMAND = 0x112;

      const int SC_MINIMIZE = 0xF020;

      const int SC_CLOSE = 0xF060;

      if (minimizeToTray.Value && 

        m.Msg == WM_SYSCOMMAND && m.WParam.ToInt64() == SC_MINIMIZE) {

        SysTrayHideShow();

      } else if (minimizeOnClose.Value &&

        m.Msg == WM_SYSCOMMAND && m.WParam.ToInt64() == SC_CLOSE) {

        /*

         * Apparently the user wants to minimize rather than close

         * Now we still need to check if we're going to the tray or not

         * 

         * Note: the correct way to do this would be to send out SC_MINIMIZE,

         * but since the code here is so simple,

         * that would just be a waste of time.

         */

        if (minimizeToTray.Value)

          SysTrayHideShow();

        else

          WindowState = FormWindowState.Minimized;

      } else {      

        base.WndProc(ref m);

      }

    }

    private void hideShowClick(object sender, EventArgs e) {

      SysTrayHideShow();

    }

    private void ShowParameterForm(ISensor sensor) {

      ParameterForm form = new ParameterForm();

      form.Parameters = sensor.Parameters;

      form.captionLabel.Text = sensor.Name;

      form.ShowDialog();

    }

    private void treeView_NodeMouseDoubleClick(object sender, 

      TreeNodeAdvMouseEventArgs e) {

      SensorNode node = e.Node.Tag as SensorNode;

      if (node != null && node.Sensor != null && 

        node.Sensor.Parameters.Length > 0) {

        ShowParameterForm(node.Sensor);

      }

    }

    private void celsiusMenuItem_Click(object sender, EventArgs e) {

      celsiusMenuItem.Checked = true;

      fahrenheitMenuItem.Checked = false;

      unitManager.TemperatureUnit = TemperatureUnit.Celsius;

    }

    private void fahrenheitMenuItem_Click(object sender, EventArgs e) {

      celsiusMenuItem.Checked = false;

      fahrenheitMenuItem.Checked = true;

      unitManager.TemperatureUnit = TemperatureUnit.Fahrenheit;

    }

    private void sumbitReportMenuItem_Click(object sender, EventArgs e) 

    {

      ReportForm form = new ReportForm();

      form.Report = computer.GetReport();

      form.ShowDialog();      

    }

    private void resetMinMaxMenuItem_Click(object sender, EventArgs e) {

      computer.Accept(new SensorVisitor(delegate(ISensor sensor) {

        sensor.ResetMin();

        sensor.ResetMax();

      }));

    }

    private void MainForm_MoveOrResize(object sender, EventArgs e) {

      if (WindowState != FormWindowState.Minimized) {

        settings.SetValue("mainForm.Location.X", Bounds.X);

        settings.SetValue("mainForm.Location.Y", Bounds.Y);

        settings.SetValue("mainForm.Width", Bounds.Width);

        settings.SetValue("mainForm.Height", Bounds.Height);

      }

    }

    private void resetClick(object sender, EventArgs e) {

      // disable the fallback MainIcon during reset, otherwise icon visibility

      // might be lost 

      systemTray.IsMainIconEnabled = false;

      computer.Close();

      computer.Open();

      // restore the MainIcon setting

      systemTray.IsMainIconEnabled = minimizeToTray.Value;

    }

    private void treeView_MouseMove(object sender, MouseEventArgs e) {

      selectionDragging = selectionDragging &

        (e.Button & (MouseButtons.Left | MouseButtons.Right)) > 0; 

      if (selectionDragging)

        treeView.SelectedNode = treeView.GetNodeAt(e.Location);     

    }

    private void treeView_MouseDown(object sender, MouseEventArgs e) {

      selectionDragging = true;

    }

    private void treeView_MouseUp(object sender, MouseEventArgs e) {

      selectionDragging = false;

    }

    private void serverPortMenuItem_Click(object sender, EventArgs e) {

      new PortForm(this).ShowDialog();

    }

    public HttpServer Server {

      get { return server; }

    }

  }

}