using System;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace Netron.Diagramming.Core {
  /// <summary>
  /// The art pallet consists of the often used colors, brushes, font etc. used by the painting methods.
  /// You can set the pallet at starup of the diagram control
  /// </summary>
  public static class ArtPalette {

    #region Fields
    private static Font mTitleFont = new Font("Arial", 20F, FontStyle.Bold);

    // ------------------------------------------------------------------
    /// <summary>
    /// The default color for new pages.
    /// </summary>
    // ------------------------------------------------------------------
    static Color mDefaultPageColor = Color.White;

    // ------------------------------------------------------------------
    /// <summary>
    /// The default color for the page background.
    /// </summary>
    // ------------------------------------------------------------------
    static Color mDefaultPageBackgroundColor = Color.DarkGray;

    // ------------------------------------------------------------------
    /// <summary>
    /// whether shadows of entities are painted
    /// </summary>
    // ------------------------------------------------------------------
    private static bool mEnableShadows = true;

    // ------------------------------------------------------------------
    /// <summary>
    /// the font for the marks on the rulers
    /// </summary>
    // ------------------------------------------------------------------
    private static Font mRulerFont = new Font(
        "Arial", 7.0F, FontStyle.Regular);

    // ------------------------------------------------------------------
    /// <summary>
    /// the ruler pen 
    /// </summary>
    // ------------------------------------------------------------------
    private static Pen mRulerPen = Pens.Black;

    // ------------------------------------------------------------------
    /// <summary>
    /// the background of the rulers
    /// </summary>
    // ------------------------------------------------------------------
    private static Brush mRulerFillBrush = Brushes.White;
    /// <summary>
    /// the brush with which to paint the ghosts
    /// </summary>
    private static Brush mGhostBrush = new SolidBrush(Color.FromArgb(120, Color.LightYellow));
    /// <summary>
    ///  the ghost pen
    /// </summary>
    private static Pen mGhostPen = new Pen(Color.Green, 1.5f);
    /// <summary>
    /// the pen to draw the interconnecting folder lines
    /// </summary>
    private static Pen mFolderLinesPen = new Pen(Color.Gray, 1.0F);
    /// <summary>
    /// the pen used for drawing the tracker
    /// </summary>
    private static Pen mTrackerPen = new Pen(Color.DimGray, 1.5F);
    /// <summary>
    /// the brush used to paint the grips
    /// </summary>
    private static Brush mGripBrush = Brushes.WhiteSmoke;
    /// <summary>
    /// Default font for drawing text
    /// </summary>
    private static Font mDefaultFont = new Font("Tahoma", 8.5F);
    /// <summary>
    /// the font used to  draw bold text
    /// </summary>
    private static Font mDefaultBoldFont = new Font("Tahoma", 8.5F, FontStyle.Bold);
    /// <summary>
    /// randomizer for generating random colors of a certain style
    /// </summary>
    private static Random rnd = new Random();
    /// <summary>
    /// Default black pen
    /// </summary>
    private static Pen mBlackPen = new Pen(Brushes.Black, 1F);
    /// <summary>
    /// the global shadow brush
    /// </summary>
    private static Brush mShadowBrush = new SolidBrush(Color.FromArgb(30, Color.Black));
    /// <summary>
    /// Default red pen
    /// </summary>
    private static Pen mHighlightPen = new Pen(Brushes.OrangeRed, 1.7F);
    /// <summary>
    /// the global shadow pen
    /// </summary>
    private static Pen mShadowPen = new Pen(Color.FromArgb(30, Color.Black), 1F);
    /// <summary>
    /// the pen used to paint the connections
    /// </summary>
    private static Pen mConnectionPen = new Pen(Color.Silver, 1F);
    /// <summary>
    /// the pen used to paint the highlighted connection
    /// </summary>
    private static Pen mConnectionHighlightPen = new Pen(Color.Red, 2.5F);

    private static IPaintStyle mTransparentPaintStyle = new SolidPaintStyle(Color.Transparent);
    #endregion

    #region Properties

    // ------------------------------------------------------------------
    /// <summary>
    /// Gets or sets the default color for new pages.
    /// </summary>
    // ------------------------------------------------------------------
    public static Color DefaultPageColor {
      get {
        return mDefaultPageColor;
      }
      set {
        mDefaultPageColor = value;
      }
    }

    // ------------------------------------------------------------------
    /// <summary>
    /// Gets or sets the default color for the background of new pages.
    /// </summary>
    // ------------------------------------------------------------------
    public static Color DefaultPageBackgroundColor {
      get {
        return mDefaultPageBackgroundColor;
      }
      set {
        mDefaultPageBackgroundColor = value;
      }
    }

    /// <summary>
    /// Gets or sets the title font used on the canvas to display the title of the current page.
    /// </summary>
    /// <value>The title font.</value>
    public static Font TitleFont {
      get { return mTitleFont; }
      set { mTitleFont = value; }
    }
    /// <summary>
    /// Gets or sets the global value indicating whether to enable entities shadows.
    /// </summary>
    /// <value><c>true</c> to enable shadows; otherwise, <c>false</c>.</value>
    public static bool EnableShadows {
      get { return mEnableShadows; }
      set { mEnableShadows = value; }
    }
    /// <summary>
    /// Gets the ruler font.
    /// </summary>
    /// <value>The ruler font.</value>
    public static Font RulerFont {
      get { return mRulerFont; }
    }
    /// <summary>
    /// Gets the pen with which the ruler is drawn.
    /// </summary>
    /// <value>The ruler pen.</value>
    public static Pen RulerPen {
      get { return mRulerPen; }
    }

    /// <summary>
    /// Gets the ruller fill brush.
    /// </summary>
    /// <value>The ruller fill brush.</value>
    public static Brush RullerFillBrush {
      get {
        return mRulerFillBrush;
      }
    }

    /// <summary>
    /// Gets the brush with which the ghosts are painted.
    /// </summary>
    /// <value>The ghost brush.</value>
    public static Brush GhostBrush {
      get {
        return mGhostBrush;
      }
    }
    /// <summary>
    /// Gets the pen to draw the multi-point ghost lines.
    /// </summary>
    /// <value>The ghost pen.</value>
    public static Pen GhostPen {
      get {
        return mGhostPen;
      }
    }
    /// <summary>
    /// Gets the pen used to draw the dashed line between <see cref="FolderMaterial"/> nodes.
    /// </summary>
    /// <value>The folder lines pen.</value>
    public static Pen FolderLinesPen {
      get {

        return mFolderLinesPen;
      }
    }
    /// <summary>
    /// Gets or sets the connection pen.
    /// </summary>
    /// <value>The connection pen.</value>
    public static Pen ConnectionPen {
      get {
        return mConnectionPen;
      }
      set {
        mConnectionPen = value;
      }
    }
    /// <summary>
    /// Gets or sets the pen used to paint the highlighted connection.
    /// </summary>
    /// <value>The connection highlight pen.</value>
    public static Pen ConnectionHighlightPen {
      get {
        return mConnectionHighlightPen;
      }
      set {
        mConnectionHighlightPen = value;
      }
    }

    /// <summary>
    /// Gets or sets the grip brush.
    /// </summary>
    /// <value>The grip brush.</value>
    public static Brush GripBrush {
      get { return mGripBrush; }
      set { mGripBrush = value; }
    }

    #endregion

    #region Methods
    /// <summary>
    /// Inits the static instance.
    /// </summary>
    public static void Init() {
      mTrackerPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
      mBlackPen.LineJoin = LineJoin.Round;

      //AdjustableArrowCap ccap = new AdjustableArrowCap(5, 7, true);
      //mConnectionPen.EndCap = LineCap.Custom;
      //mConnectionPen.CustomEndCap = ccap;

      //mConnectionHighlightPen.EndCap = LineCap.Custom;
      //mConnectionHighlightPen.CustomEndCap = ccap;

      mFolderLinesPen.DashStyle = DashStyle.Dot;
    }
    /// <summary>
    /// Gets or sets the default font to render text on the canvas.
    /// </summary>
    /// <value>The font.</value>
    public static Font DefaultFont {
      get {
        return ArtPalette.mDefaultFont;
      }
      set {
        ArtPalette.mDefaultFont = value;
      }
    }
    /// <summary>
    /// Gets or sets the default bold font to render text on the canvas.
    /// </summary>
    /// <value>The font.</value>
    public static Font DefaultBoldFont {
      get {
        return ArtPalette.mDefaultBoldFont;
      }
      set {
        ArtPalette.mDefaultBoldFont = value;
      }
    }
    /// <summary>
    /// Gets the black pen.
    /// </summary>
    /// <value>The black pen.</value>
    public static Pen BlackPen {
      get {
        return ArtPalette.mBlackPen;
      }
      set {
        ArtPalette.mBlackPen = value;
      }
    }
    /// <summary>
    /// Gets the tracker pen.
    /// </summary>
    /// <value>The red pen.</value>
    public static Pen TrackerPen {
      get {
        return ArtPalette.mTrackerPen;
      }
      set { ArtPalette.mTrackerPen = value; }
    }
    /// <summary>
    /// Gets the red pen.
    /// </summary>
    /// <value>The red pen.</value>
    public static Pen HighlightPen {
      get {
        return ArtPalette.mHighlightPen;
      }
      set {
        ArtPalette.mHighlightPen = value;
      }
    }
    /// <summary>
    /// Gets the shadow brush.
    /// </summary>
    /// <value>The shadow brush.</value>
    public static Brush ShadowBrush {
      get {
        return ArtPalette.mShadowBrush;
      }
      set {
        ArtPalette.mShadowBrush = value;
      }
    }
    /// <summary>
    /// Gets the shadow pen to paint the shadow of the connections.
    /// </summary>
    /// <value>The shadow pen.</value>
    public static Pen ConnectionShadow {
      get {
        return ArtPalette.mShadowPen;
      }
      set {
        ArtPalette.mShadowPen = value;
      }
    }
    /// <summary>
    /// Gets a random color from the whole available color spectrum.
    /// </summary>
    /// <value>The random color.</value>
    ///<example file="ArtPallet.RandomColor.xml">
    ///
    /// 
    /// wdfgsdfgsdfs
    ///</example>
    public static Color RandomColor {
      get {
        return Color.FromArgb(rnd.Next(10, 250), rnd.Next(10, 250), rnd.Next(10, 250));
      }
    }
    /// <summary>
    /// Gets a random blue color.
    /// <remarks>You can generate any variation of a certain color range by specifying the HSV range and a utility function will convert it to 
    /// an RGB value (<see cref="Utils.HSL2RGB"/>).
    /// </remarks>
    /// </summary>
    /// <value>The random blues.</value>
    public static Color RandomBlues {
      get {
        return (Color)Utils.HSL2RGB(
            (rnd.NextDouble() * 20D + 150D) / 255D,
            (rnd.NextDouble() * 150D + 100D) / 255D,
            (rnd.NextDouble() * 50D + 150D) / 255D);
      }
    }
    /// <summary>
    /// Gets a random low saturation color.
    /// </summary>
    /// <value>The random color.</value>
    public static Color RandomLowSaturationColor {
      get {
        return (Color)Utils.HSL2RGB(
            (rnd.NextDouble() * 255D) / 255D,
            (rnd.NextDouble() * 20D + 30D) / 255D,
            (rnd.NextDouble() * 20D + 130D) / 255D);
      }
    }

    /// <summary>
    /// Gets the solid brush.
    /// </summary>
    /// <param name="color">The color.</param>
    /// <param name="alpha">The alpha.</param>
    /// <returns></returns>
    public static Brush GetSolidBrush(Color color, int alpha) {
      return new SolidBrush(Color.FromArgb(alpha, color));
    }

    /// <summary>
    /// Gets the gradient brush.
    /// </summary>
    /// <param name="startColor">The start color.</param>
    /// <param name="endColor">The end color.</param>
    /// <param name="rectangle">The rectangle.</param>
    /// <param name="angle">The angle.</param>
    /// <returns></returns>
    public static Brush GetGradientBrush(Color startColor, Color endColor, Rectangle rectangle, float angle) {
      return new LinearGradientBrush(rectangle, startColor, endColor, angle);
    }

    /// <summary>
    /// Gets the default solid <see cref="IPaintStyle"/>.
    /// </summary>
    /// <returns></returns>
    public static IPaintStyle GetDefaultSolidPaintStyle() {
      return new SolidPaintStyle(ArtPalette.RandomLowSaturationColor);
    }
    /// <summary>
    /// Gets the default gradient <see cref="IPaintStyle"/>.
    /// </summary>
    /// <returns></returns>
    public static IPaintStyle GetDefaultGradientPaintStyle() {
      return new GradientPaintStyle();
    }
    /// <summary>
    /// Gets the transparent <see cref="IPaintStyle"/>.
    /// </summary>
    /// <returns></returns>
    public static IPaintStyle GetTransparentPaintStyle() {
      return mTransparentPaintStyle;
    }

    /// <summary>
    /// Returns the default paint style for the whole control.
    /// </summary>
    /// <returns></returns>
    public static IPaintStyle GetDefaultPaintStyle() {
      return GetDefaultGradientPaintStyle();
    }

    /// <summary>
    /// Gets the default <see cref="IPenStyle"/>.
    /// </summary>
    /// <returns></returns>
    public static IPenStyle GetDefaultPenStyle() {
      return new PenStyle(); //this returns a black, standard pen.
    }

    /// <summary>
    /// The <see cref="IPenStyle"/> used when the ConnectorStyle is 
    /// 'Simple'.
    /// </summary>
    /// <returns></returns>
    public static IPenStyle GetSimpleConnectorPenStyle() {
      LinePenStyle penStyle = new LinePenStyle();
      penStyle.DashStyle = DashStyle.Solid;
      penStyle.Color = Color.Blue;
      return penStyle;
    }

    /// <summary>
    /// Returns the <see cref="IPaintStyle"/> used when the 
    /// ConnectorStyle is 'Simple'.
    /// </summary>
    /// <returns></returns>
    public static IPaintStyle GetSimpleConnectorPaintStyle() {
      return new SolidPaintStyle(Color.Transparent);
    }

    #endregion

  }

}