#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2010 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;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Common.Resources;

namespace HeuristicLab.Analysis.FitnessLandscape {

  public class PointsEventArgs : EventArgs {
    public IEnumerable<PointF> NewPoints { get; private set; }
    public PointsEventArgs(IEnumerable<PointF> points) {
      NewPoints = points.ToList();
    }
  }

  [Item("ScatterPlot", "A scatter plot of 2D data")]
  [StorableClass]
  public class ScatterPlot : NamedItem {

    public static new Image StaticItemImage { get { return VSImageLibrary.Image; } }

    public event EventHandler<PointsEventArgs> PixelsChanged;
    public event EventHandler AxisNameChanged;

    protected virtual void OnPixelsChanged(IEnumerable<PointF> p) {
      EventHandler<PointsEventArgs> handler = PixelsChanged;
      if (handler != null)
        handler(this, new PointsEventArgs(p));
    }

    protected virtual void OnAxesNameChanged() {
      EventHandler handler = AxisNameChanged;
      if (handler != null)
        handler(this, EventArgs.Empty);
    }

    private IEnumerable<float> GetPointCoordinates() {
      foreach (var p in points) {
        yield return p.X;
        yield return p.Y;
      }
    }

    [Storable]
    private List<float> PointCoordinateList {
      get {
        return new List<float>(GetPointCoordinates());
      }
      set {
        points = new HashSet<PointF>();
        var iter = value.GetEnumerator();
        while (iter.MoveNext()) {
          float x = iter.Current;
          iter.MoveNext();
          float y = iter.Current;
          points.Add(new PointF(x, y));
        }
      }
    }

    private HashSet<PointF> points;
    public IEnumerable<PointF> Points {
      get { return points; }
    }

    [Storable]
    private string xAxisName;
    public string XAxisName {
      get { return xAxisName; }
      set {
        if (value == xAxisName) return;
        xAxisName = value;
        OnAxesNameChanged();
      }
    }

    [Storable]
    private string yAxisName;
    public string YAxisName {
      get { return yAxisName; }
      set {
        if (value == yAxisName) return;
        yAxisName = value;
        OnAxesNameChanged();
      }
    }

    public void Add(IEnumerable<PointF> points) {
      List<PointF> newPoints = new List<PointF>();
      foreach (var p in points) {
        if (this.points.Add(p))
          newPoints.Add(p);
      }
      if (newPoints.Count > 0)
        OnPixelsChanged(newPoints);
    }

    [StorableConstructor]
    protected ScatterPlot(bool deserializing) : base(deserializing) { }
    protected ScatterPlot(ScatterPlot original, Cloner cloner)
      : base(original, cloner) {
      points = new HashSet<PointF>(original.points.Select(p => new PointF(p.X, p.Y)));
      xAxisName = original.xAxisName;
      yAxisName = original.yAxisName;
    }


    public ScatterPlot() {
      points = new HashSet<PointF>();
      Name = "Scatter Plot";
      xAxisName = "Fitness";
      yAxisName = "Distance";
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new ScatterPlot(this, cloner);
    }


    internal void Clear() {
      var oldPoints = points;
      points = new HashSet<PointF>();
      OnPixelsChanged(oldPoints);
    }
  }
}