#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2013 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Visualization;

namespace HeuristicLab.EvolutionaryTracking.Views {
  public class LabeledEllipse : Ellipse, ILayoutNode<ISymbolicExpressionTreeNode> {
    private string text;
    public string Text { get { return text; } set { text = value; } }

    private Font font;
    public Font Font { get { return font; } set { font = value; } }

    private Brush fontBrush;
    public Brush FontBrush { get { return fontBrush; } set { fontBrush = value; } }

    public LabeledEllipse(IChart chart, PointD lowerLeft, PointD upperRight)
      : base(chart, lowerLeft, upperRight) {
      font = new Font(FontFamily.GenericSansSerif, 10);
    }
    public LabeledEllipse(IChart chart, double x1, double y1, double x2, double y2)
      : this(chart, new PointD(x1, y1), new PointD(x2, y2)) {
    }
    public LabeledEllipse(IChart chart, PointD lowerLeft, PointD upperRight, Pen pen, Brush brush)
      : base(chart, lowerLeft, upperRight, pen, brush) {
      font = new Font(FontFamily.GenericSansSerif, 10);
    }
    public LabeledEllipse(IChart chart, double x1, double y1, double x2, double y2, Pen pen, Brush brush)
      : this(chart, new PointD(x1, y1), new PointD(x2, y2), pen, brush) {
    }

    public override void Draw(Graphics graphics) {
      var p = Chart.TransformWorldToPixel(new PointD(LowerLeft.X, LowerLeft.Y));
      var s = Chart.TransformWorldToPixel(Size);
      var stringSize = graphics.MeasureString(Text, Font);
      var fontSize = Font.Size * s.Width / stringSize.Width;
      if (fontSize > 12) fontSize = 12; // limit maximum font size to 10pt
      font = new Font(font.Name, fontSize, FontStyle.Regular, GraphicsUnit.Pixel);
      stringSize = graphics.MeasureString(Text, Font);
      graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
      graphics.DrawString(Text, Font, FontBrush, p.X + (s.Width - stringSize.Width) / 2f, p.Y - (s.Height + stringSize.Height) / 2f);
      base.Draw(graphics);
    }

    public ILayoutNode<ISymbolicExpressionTreeNode> Thread { get; set; }
    public ILayoutNode<ISymbolicExpressionTreeNode> Ancestor { get; set; }
    public ILayoutNode<ISymbolicExpressionTreeNode> Parent { get; set; }
    public List<ILayoutNode<ISymbolicExpressionTreeNode>> Children { get; set; }
    public float Mod { get; set; }
    public float Prelim { get; set; }
    public float Change { get; set; }
    public float Shift { get; set; }
    public int Number { get; set; }
    public int Level { get; set; }
    public float X { get; set; }
    public float Y { get; set; }
    public bool IsLeaf {
      get { return Children == null || Children.Count == 0; }
    }
    public ILayoutNode<ISymbolicExpressionTreeNode> NextLeft {
      get {
        return Children == null ? Thread : Children.First();
      }
    }
    public ILayoutNode<ISymbolicExpressionTreeNode> NextRight {
      get {
        return Children == null ? Thread : Children.Last();
      }
    }
    public ILayoutNode<ISymbolicExpressionTreeNode> LeftSibling {
      get {
        if (Parent == null) return null;
        return Number == 0 ? null : Parent.Children[Number - 1];
      }
    }
    public ILayoutNode<ISymbolicExpressionTreeNode> LeftmostSibling {
      get {
        if (Parent == null) return null;
        return Number == 0 ? null : Parent.Children[0];
      }
    }
    public ISymbolicExpressionTreeNode Content { get; set; }
  }
}