/*

  Version: MPL 1.1/GPL 2.0/LGPL 2.1

  The contents of this file are subject to the Mozilla Public License Version

  1.1 (the "License"); you may not use this file except in compliance with

  the License. You may obtain a copy of the License at

  http://www.mozilla.org/MPL/

  Software distributed under the License is distributed on an "AS IS" basis,

  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License

  for the specific language governing rights and limitations under the License.

  The Original Code is the Open Hardware Monitor code.

  The Initial Developer of the Original Code is 

  Michael Möller <m.moeller@gmx.ch>.

  Portions created by the Initial Developer are Copyright (C) 2010-2011

  the Initial Developer. All Rights Reserved.

  Contributor(s):

  Alternatively, the contents of this file may be used under the terms of

  either the GNU General Public License Version 2 or later (the "GPL"), or

  the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

  in which case the provisions of the GPL or the LGPL are applicable instead

  of those above. If you wish to allow use of your version of this file only

  under the terms of either the GPL or the LGPL, and not to allow others to

  use your version of this file under the terms of the MPL, indicate your

  decision by deleting the provisions above and replace them with the notice

  and other provisions required by the GPL or the LGPL. If you do not delete

  the provisions above, a recipient may use your version of this file under

  the terms of any one of the MPL, the GPL or the LGPL.

*/

using System;

using System.Collections.Generic;

using System.Drawing;

using System.Windows.Forms;

using OpenHardwareMonitor.Hardware;

namespace OpenHardwareMonitor.GUI {

  public class SensorGadget : Gadget {

    private UnitManager unitManager;

    private Image back = Utilities.EmbeddedResources.GetImage("gadget.png");

    private Image barBack = Utilities.EmbeddedResources.GetImage("barback.png");

    private Image barblue = Utilities.EmbeddedResources.GetImage("barblue.png");

    private const int topBorder = 6;

    private const int bottomBorder = 7;

    private const int leftBorder = 6;

    private const int rightBorder = 7;

    private readonly float scale;

    private float fontSize;

    private int iconSize;

    private int hardwareLineHeight;

    private int sensorLineHeight;

    private int rightMargin;

    private int leftMargin;

    private int topMargin;

    private int bottomMargin;

    private int progressWidth;

    private IDictionary<IHardware, IList<ISensor>> sensors =

      new SortedDictionary<IHardware, IList<ISensor>>(new HardwareComparer());

    private PersistentSettings settings;

    private UserOption hardwareNames;

    private UserOption alwaysOnTop;

    private UserOption lockPositionAndSize;

    private Font largeFont;

    private Font smallFont;

    private Brush darkWhite;

    private StringFormat stringFormat;

    private StringFormat trimStringFormat;

    private StringFormat alignRightStringFormat;

    public SensorGadget(IComputer computer, PersistentSettings settings, 

      UnitManager unitManager) 

    {

      this.unitManager = unitManager;

      this.settings = settings;

      computer.HardwareAdded += new HardwareEventHandler(HardwareAdded);

      computer.HardwareRemoved += new HardwareEventHandler(HardwareRemoved);      

      this.darkWhite = new SolidBrush(Color.FromArgb(0xF0, 0xF0, 0xF0));

      this.stringFormat = new StringFormat();

      this.stringFormat.FormatFlags = StringFormatFlags.NoWrap;

      this.trimStringFormat = new StringFormat();

      this.trimStringFormat.Trimming = StringTrimming.EllipsisCharacter;

      this.trimStringFormat.FormatFlags = StringFormatFlags.NoWrap;

      this.alignRightStringFormat = new StringFormat();

      this.alignRightStringFormat.Alignment = StringAlignment.Far;

      this.alignRightStringFormat.FormatFlags = StringFormatFlags.NoWrap;

      this.Location = new Point(

        settings.GetValue("sensorGadget.Location.X", 100),

        settings.GetValue("sensorGadget.Location.Y", 100)); 

      LocationChanged += delegate(object sender, EventArgs e) {

        settings.SetValue("sensorGadget.Location.X", Location.X);

        settings.SetValue("sensorGadget.Location.Y", Location.Y);

      };

      // get the custom to default dpi ratio

      using (Bitmap b = new Bitmap(1, 1)) {

        scale = b.HorizontalResolution / 96.0f;

      }

      SetFontSize(settings.GetValue("sensorGadget.FontSize", 7.5f));

      Resize(settings.GetValue("sensorGadget.Width", Size.Width));

      ContextMenu contextMenu = new ContextMenu();

      MenuItem hardwareNamesItem = new MenuItem("Hardware Names");

      contextMenu.MenuItems.Add(hardwareNamesItem);

      MenuItem fontSizeMenu = new MenuItem("Font Size");

      for (int i = 0; i < 4; i++) {

        float size;

        string name;

        switch (i) {

          case 0: size = 6.5f; name = "Small"; break;

          case 1: size = 7.5f; name = "Medium"; break;

          case 2: size = 9f; name = "Large"; break;

          case 3: size = 11f; name = "Very Large"; break;

          default: throw new NotImplementedException();

        }

        MenuItem item = new MenuItem(name);

        item.Checked = fontSize == size;

        item.Click += delegate(object sender, EventArgs e) {

          SetFontSize(size);

          settings.SetValue("sensorGadget.FontSize", size);

          foreach (MenuItem mi in fontSizeMenu.MenuItems)

            mi.Checked = mi == item;

        };

        fontSizeMenu.MenuItems.Add(item);

      }

      contextMenu.MenuItems.Add(fontSizeMenu);

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

      MenuItem lockItem = new MenuItem("Lock Position and Size");

      contextMenu.MenuItems.Add(lockItem);

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

      MenuItem alwaysOnTopItem = new MenuItem("Always on Top");

      contextMenu.MenuItems.Add(alwaysOnTopItem);

      MenuItem opacityMenu = new MenuItem("Opacity");

      contextMenu.MenuItems.Add(opacityMenu);

      Opacity = (byte)settings.GetValue("sensorGadget.Opacity", 255);      

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

        MenuItem item = new MenuItem((20 * (i + 1)).ToString() + " %");

        byte o = (byte)(51 * (i + 1));

        item.Checked = Opacity == o;

        item.Click += delegate(object sender, EventArgs e) {

          Opacity = o;

          settings.SetValue("sensorGadget.Opacity", Opacity);

          foreach (MenuItem mi in opacityMenu.MenuItems)

            mi.Checked = mi == item;          

        };

        opacityMenu.MenuItems.Add(item);

      }

      this.ContextMenu = contextMenu;

      hardwareNames = new UserOption("sensorGadget.Hardwarenames", true,

        hardwareNamesItem, settings);

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

        Resize();

      };

      alwaysOnTop = new UserOption("sensorGadget.AlwaysOnTop", false, 

        alwaysOnTopItem, settings);

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

        this.AlwaysOnTop = alwaysOnTop.Value;

      };

      lockPositionAndSize = new UserOption("sensorGadget.LockPositionAndSize", 

        false, lockItem, settings);

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

        this.LockPositionAndSize = lockPositionAndSize.Value;

      };

      HitTest += delegate(object sender, HitTestEventArgs e) {

        if (lockPositionAndSize.Value)

          return;

        if (e.Location.X < leftBorder) {

          e.HitResult = HitResult.Left;

          return;

        }

        if (e.Location.X > Size.Width - 1 - rightBorder) {

          e.HitResult = HitResult.Right;

          return;

        }

      };

      SizeChanged += delegate(object sender, EventArgs e) {

        settings.SetValue("sensorGadget.Width", Size.Width);

        Redraw();

      };

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

        Rectangle bounds = new Rectangle(Location, 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)) 

        {

          Location = new Point(

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

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

        }

      };

      MouseDoubleClick += delegate(object obj, MouseEventArgs args) {

        SendHideShowCommand();

      };

    }

    public override void Dispose() {

      largeFont.Dispose();

      largeFont = null;

      smallFont.Dispose();

      smallFont = null;

      darkWhite.Dispose();

      darkWhite = null;

      stringFormat.Dispose();

      stringFormat = null;

      trimStringFormat.Dispose();

      trimStringFormat = null;

      alignRightStringFormat.Dispose();

      alignRightStringFormat = null;      

      base.Dispose();

    }

    private void HardwareRemoved(IHardware hardware) {

      hardware.SensorAdded -= new SensorEventHandler(SensorAdded);

      hardware.SensorRemoved -= new SensorEventHandler(SensorRemoved);

      foreach (ISensor sensor in hardware.Sensors)

        SensorRemoved(sensor);

      foreach (IHardware subHardware in hardware.SubHardware)

        HardwareRemoved(subHardware);

    }

    private void HardwareAdded(IHardware hardware) {

      foreach (ISensor sensor in hardware.Sensors)

        SensorAdded(sensor);

      hardware.SensorAdded += new SensorEventHandler(SensorAdded);

      hardware.SensorRemoved += new SensorEventHandler(SensorRemoved);

      foreach (IHardware subHardware in hardware.SubHardware)

        HardwareAdded(subHardware);

    }

    private void SensorAdded(ISensor sensor) {

      if (settings.GetValue(new Identifier(sensor.Identifier,

        "gadget").ToString(), false)) 

        Add(sensor);

    }

    private void SensorRemoved(ISensor sensor) {

      if (Contains(sensor))

        Remove(sensor, false);

    }

    public bool Contains(ISensor sensor) {

      foreach (IList<ISensor> list in sensors.Values)

        if (list.Contains(sensor))

          return true;

      return false;

    }

    public void Add(ISensor sensor) {

      if (Contains(sensor)) {

        return;

      } else {

        // get the right hardware

        IHardware hardware = sensor.Hardware;

        while (hardware.Parent != null)

          hardware = hardware.Parent;

        // get the sensor list associated with the hardware

        IList<ISensor> list;

        if (!sensors.TryGetValue(hardware, out list)) {

          list = new List<ISensor>();

          sensors.Add(hardware, list);

        }

        // insert the sensor at the right position

        int i = 0;

        while (i < list.Count && (list[i].SensorType < sensor.SensorType || 

          (list[i].SensorType == sensor.SensorType && 

           list[i].Index < sensor.Index))) i++;

        list.Insert(i, sensor);

        settings.SetValue(

          new Identifier(sensor.Identifier, "gadget").ToString(), true);

        Resize();

      }

    }

    public void Remove(ISensor sensor) {

      Remove(sensor, true);

    }

    private void Remove(ISensor sensor, bool deleteConfig) {

      if (deleteConfig) 

        settings.Remove(new Identifier(sensor.Identifier, "gadget").ToString());

      foreach (KeyValuePair<IHardware, IList<ISensor>> keyValue in sensors)

        if (keyValue.Value.Contains(sensor)) {

          keyValue.Value.Remove(sensor);          

          if (keyValue.Value.Count == 0) {

            sensors.Remove(keyValue.Key);

            break;

          }

        }

      Resize();

    }

    public event EventHandler HideShowCommand;

    public void SendHideShowCommand() {

      if (HideShowCommand != null)

        HideShowCommand(this, null);

    }

    private Font CreateFont(float size, FontStyle style) {

      try {

        return new Font(SystemFonts.MessageBoxFont.FontFamily, size, style);

      } catch (ArgumentException) {

        // if the style is not supported, fall back to the original one

        return new Font(SystemFonts.MessageBoxFont.FontFamily, size, 

          SystemFonts.MessageBoxFont.Style);

      }

    }

    private void SetFontSize(float size) {

      fontSize = size;

      largeFont = CreateFont(fontSize, FontStyle.Bold);

      smallFont = CreateFont(fontSize, FontStyle.Regular);

      double scaledFontSize = fontSize * scale;

      iconSize = (int)Math.Round(1.5 * scaledFontSize);

      hardwareLineHeight = (int)Math.Round(1.66 * scaledFontSize);

      sensorLineHeight = (int)Math.Round(1.33 * scaledFontSize);

      leftMargin = leftBorder + (int)Math.Round(0.3 * scaledFontSize);

      rightMargin = rightBorder + (int)Math.Round(0.3 * scaledFontSize);

      topMargin = topBorder;

      bottomMargin = bottomBorder + (int)Math.Round(0.3 * scaledFontSize);

      progressWidth = (int)Math.Round(5.3 * scaledFontSize);

      Resize((int)Math.Round(17.3 * scaledFontSize));

    }

    private void Resize() {

      Resize(this.Size.Width);

    }

    private void Resize(int width) {

      int y = topMargin;      

      foreach (KeyValuePair<IHardware, IList<ISensor>> pair in sensors) {

        if (hardwareNames.Value) {

          if (y > topMargin)

            y += hardwareLineHeight - sensorLineHeight;

          y += hardwareLineHeight;

        }

        y += pair.Value.Count * sensorLineHeight;

      }      

      if (sensors.Count == 0)

        y += 4 * sensorLineHeight + hardwareLineHeight;

      y += bottomMargin;

      this.Size = new Size(width, y);

    }

    private void DrawBackground(Graphics g) {

      int w = Size.Width;

      int h = Size.Height;

      int t = topBorder;

      int b = bottomBorder;

      int l = leftBorder;

      int r = rightBorder;

      GraphicsUnit u = GraphicsUnit.Pixel;

      g.DrawImage(back, new Rectangle(0, 0, l, t),

        new Rectangle(0, 0, l, t), u);

      g.DrawImage(back, new Rectangle(l, 0, w - l - r, t),

        new Rectangle(l, 0, back.Width - l - r, t), u);

      g.DrawImage(back, new Rectangle(w - r, 0, r, t),

        new Rectangle(back.Width - r, 0, r, t), u);

      g.DrawImage(back, new Rectangle(0, t, l, h - t - b),

        new Rectangle(0, t, l, back.Height - t - b), u);

      g.DrawImage(back, new Rectangle(l, t, w - l - r, h - t - b),

        new Rectangle(l, t, back.Width - l - r, back.Height - t - b), u);

      g.DrawImage(back, new Rectangle(w - r, t, r, h - t - b),

        new Rectangle(back.Width - r, t, r, back.Height - t - b), u);

      g.DrawImage(back, new Rectangle(0, h - b, l, b),

        new Rectangle(0, back.Height - b, l, b), u);

      g.DrawImage(back, new Rectangle(l, h - b, w - l - r, b),

        new Rectangle(l, back.Height - b, back.Width - l - r, b), u);

      g.DrawImage(back, new Rectangle(w - r, h - b, r, b),

        new Rectangle(back.Width - r, back.Height - b, r, b), u);

    }

    private void DrawProgress(Graphics g, float x, float y, 

      float width, float height, float progress) 

    {

      g.DrawImage(barBack, 

        new RectangleF(x + width * progress, y, width * (1 - progress), height), 

        new RectangleF(barBack.Width * progress, 0, 

          (1 - progress) * barBack.Width, barBack.Height), 

        GraphicsUnit.Pixel);

      g.DrawImage(barblue,

        new RectangleF(x, y, width * progress, height),

        new RectangleF(0, 0, progress * barblue.Width, barblue.Height),

        GraphicsUnit.Pixel);

    }

    protected override void OnPaint(PaintEventArgs e) {

      Graphics g = e.Graphics;

      int w = Size.Width;

      g.Clear(Color.Transparent);

      DrawBackground(g);

      int x;

      int y = topMargin;

      if (sensors.Count == 0) {

        x = leftBorder + 1;

        g.DrawString("Right-click on a sensor in the main window and select " + 

          "\"Show in Gadget\" to show the sensor here.", 

          smallFont, Brushes.White,

          new Rectangle(x, y - 1, w - rightBorder - x, 0));

      }

      foreach (KeyValuePair<IHardware, IList<ISensor>> pair in sensors) {

        if (hardwareNames.Value) {

          if (y > topMargin)

            y += hardwareLineHeight - sensorLineHeight;

          x = leftBorder + 1;

          g.DrawImage(HardwareTypeImage.Instance.GetImage(pair.Key.HardwareType),

            new Rectangle(x, y + 1, iconSize, iconSize));

          x += iconSize + 1;

          g.DrawString(pair.Key.Name, largeFont, Brushes.White,

            new Rectangle(x, y - 1, w - rightBorder - x, 0), 

            stringFormat);

          y += hardwareLineHeight;

        }

        foreach (ISensor sensor in pair.Value) {

          int remainingWidth;

          if ((sensor.SensorType != SensorType.Load &&

               sensor.SensorType != SensorType.Control &&

               sensor.SensorType != SensorType.Level) || !sensor.Value.HasValue) 

          {

            string formatted;

            if (sensor.Value.HasValue) {

              string format = "";

              switch (sensor.SensorType) {

                case SensorType.Voltage:

                  format = "{0:F3} V";

                  break;

                case SensorType.Clock:

                  format = "{0:F0} MHz";

                  break;

                case SensorType.Temperature:

                  format = "{0:F1} °C";

                  break;

                case SensorType.Fan:

                  format = "{0:F0} RPM";

                  break;

                case SensorType.Flow:

                  format = "{0:F0} L/h";

                  break;

              }

              if (sensor.SensorType == SensorType.Temperature &&

                unitManager.TemperatureUnit == TemperatureUnit.Fahrenheit) {

                formatted = string.Format("{0:F1} °F",

                  sensor.Value * 1.8 + 32);

              } else {

                formatted = string.Format(format, sensor.Value);

              }

            } else {

              formatted = "-";

            }

            g.DrawString(formatted, smallFont, darkWhite,

              new RectangleF(-1, y - 1, w - rightMargin + 3, 0),

              alignRightStringFormat);

            remainingWidth = w - (int)Math.Floor(g.MeasureString(formatted,

              smallFont, w, StringFormat.GenericTypographic).Width) -

              rightMargin;

          } else {

            DrawProgress(g, w - progressWidth - rightMargin,

              y + 0.35f * sensorLineHeight, progressWidth,

              0.6f * sensorLineHeight, 0.01f * sensor.Value.Value);

            remainingWidth = w - progressWidth - rightMargin;

          }

          remainingWidth -= leftMargin + 2;

          if (remainingWidth > 0) {

            g.DrawString(sensor.Name, smallFont, darkWhite,

              new RectangleF(leftMargin - 1, y - 1, remainingWidth, 0), 

              trimStringFormat);

          }

          y += sensorLineHeight;

        }

      }

    }

    private class HardwareComparer : IComparer<IHardware> {

      public int Compare(IHardware x, IHardware y) {

        if (x == null && y == null)

          return 0;

        if (x == null)

          return -1;

        if (y == null)

          return 1;

        if (x.HardwareType != y.HardwareType)

          return x.HardwareType.CompareTo(y.HardwareType);

        return x.Identifier.CompareTo(y.Identifier);

      }

    }

  }

}