#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 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.Text;
using System.Drawing;
using System.Linq;
using HeuristicLab.Charting;
using System.Windows.Forms;

namespace HeuristicLab.CEDMA.Charting {
  public class BubbleChart : Chart {
    private const double maxXJitterPercent = 0.05;
    private const double maxYJitterPercent = 0.05;
    private const int minBubbleSize = 5;
    private const int maxBubbleSize = 30;
    private const int maxAlpha = 255;
    private const int minAlpha = 50;
    private static readonly Color defaultColor = Color.Blue;
    private static readonly Color selectionColor = Color.Red;

    private double xJitterFactor = 0.0;
    private double yJitterFactor = 0.0;
    private string xDimension;
    private string yDimension;
    private string sizeDimension;
    private bool invertSize;
    private double minX = double.PositiveInfinity;
    private double minY = double.PositiveInfinity;
    private double maxX = double.NegativeInfinity;
    private double maxY = double.NegativeInfinity;
    private List<Record> records;
    private ResultList results;
    private Dictionary<IPrimitive, Record> primitiveToRecordDictionary;
    private Dictionary<Record, IPrimitive> recordToPrimitiveDictionary;
    private Random random = new Random();
    private Group points;

    public BubbleChart(ResultList results, PointD lowerLeft, PointD upperRight)
      : base(lowerLeft, upperRight) {
      records = new List<Record>();
      primitiveToRecordDictionary = new Dictionary<IPrimitive, Record>();
      recordToPrimitiveDictionary = new Dictionary<Record, IPrimitive>();
      this.results = results;
      foreach(Record r in results.Records) {
        records.Add(r);
     }
      results.OnRecordAdded += new EventHandler<RecordAddedEventArgs>(results_OnRecordAdded);
      results.Changed += new EventHandler(results_Changed);
    }

    void results_Changed(object sender, EventArgs e) {
      Repaint();
      EnforceUpdate();
    }

    public BubbleChart(ResultList results, double x1, double y1, double x2, double y2)
      : this(results, new PointD(x1, y1), new PointD(x2, y2)) {
    }

    void results_OnRecordAdded(object sender, RecordAddedEventArgs e) {
      lock(records) {
        records.Add(e.Record);
      }
    }

    public void SetBubbleSizeDimension(string dimension, bool inverted) {
      this.sizeDimension = dimension;
      this.invertSize = inverted;
      Repaint();
      EnforceUpdate();
    }

    public void ShowXvsY(string xDimension, string yDimension) {
      if(this.xDimension != xDimension || this.yDimension != yDimension) {
        this.xDimension = xDimension;
        this.yDimension = yDimension;
        ResetViewSize();
        Repaint();
        ZoomToViewSize();
      }
    }

    internal void SetJitter(double xJitterFactor, double yJitterFactor) {
      this.xJitterFactor = xJitterFactor * maxXJitterPercent * Size.Width;
      this.yJitterFactor = yJitterFactor * maxYJitterPercent * Size.Height;
      Repaint();
      EnforceUpdate();
    }

    private void Repaint() {
      if(xDimension == null || yDimension == null) return;
      lock(records) {
        double maxSize = 1;
        double minSize = 1;
        if(sizeDimension != null) {
          var sizes = records.Select(r => r.Get(sizeDimension)).Where(x => !double.IsInfinity(x) && x != double.MaxValue && x != double.MinValue).OrderBy(x=>x);
          minSize = sizes.ElementAt((int)(sizes.Count() * 0.1));
          maxSize = sizes.ElementAt((int)(sizes.Count() * 0.9));
        }
        UpdateEnabled = false;
        Group.Clear();
        primitiveToRecordDictionary.Clear();
        recordToPrimitiveDictionary.Clear();
        points = new Group(this);
        Group.Add(new Axis(this, 0, 0, AxisType.Both));
        UpdateViewSize(0, 0, 5);
        foreach(Record r in records) {
          double x = r.Get(xDimension) + r.Get(Record.X_JITTER) * xJitterFactor;
          double y = r.Get(yDimension) + r.Get(Record.Y_JITTER) * yJitterFactor;
          int size = CalculateSize(r.Get(sizeDimension), minSize, maxSize);

          if(double.IsInfinity(x) || x == double.MaxValue || x == double.MinValue) x = double.NaN;
          if(double.IsInfinity(y) || y == double.MaxValue || y == double.MinValue) y = double.NaN;
          if(!double.IsNaN(x) && !double.IsNaN(y)) {
            UpdateViewSize(x, y, size);
            int alpha = CalculateAlpha(size);
            Pen pen = new Pen(Color.FromArgb(alpha, r.Selected ? selectionColor : defaultColor));
            Brush brush = pen.Brush;
            FixedSizeCircle c = new FixedSizeCircle(this, x, y, size, pen, brush);
            c.ToolTipText = r.GetToolTipText();
            points.Add(c);
            if(!r.Selected) c.IntoBackground();
            primitiveToRecordDictionary[c] = r;
            recordToPrimitiveDictionary[r] = c;
          }
        }
        Group.Add(points);
        UpdateEnabled = true;
      }
    }

    private int CalculateSize(double size, double minSize, double maxSize) {
      if(double.IsNaN(size) || double.IsInfinity(size) || size == double.MaxValue || size == double.MinValue) return minBubbleSize;
      if(size > maxSize) size = maxSize;
      if(size < minSize) size = minSize;
      double sizeDifference = ((size - minSize) / (maxSize - minSize) * (maxBubbleSize - minBubbleSize));
      if(invertSize) return maxBubbleSize - (int)sizeDifference;
      else return minBubbleSize + (int)sizeDifference;
    }

    private int CalculateAlpha(int size) {
      return maxAlpha - (int)((double)(size - minBubbleSize) / (double)(maxBubbleSize - minBubbleSize) * (double)(maxAlpha - minAlpha));
    }

    private void ZoomToViewSize() {
      if(minX < maxX && minY < maxY) {
        // enlarge view by 5% on each side
        double width = maxX - minX;
        double height = maxY - minY;
        minX = minX - width * 0.05;
        maxX = maxX + width * 0.05;
        minY = minY - height * 0.05;
        maxY = maxY + height * 0.05;
        ZoomIn(minX, minY, maxX, maxY);
      }
    }

    private void UpdateViewSize(double x, double y, double size) {
      if(x - size < minX) minX = x - size;
      if(x + size > maxX) maxX = x + size;
      if(y - size < minY) minY = y + size;
      if(y + size > maxY) maxY = y + size;
    }

    private void ResetViewSize() {
      minX = double.PositiveInfinity;
      maxX = double.NegativeInfinity;
      minY = double.PositiveInfinity;
      maxY = double.NegativeInfinity;
    }

    internal Record GetRecord(Point point) {
      Record r = null;
      IPrimitive p = points.GetPrimitive(TransformPixelToWorld(point));
      if(p != null) {
        primitiveToRecordDictionary.TryGetValue(p, out r);
      }
      return r;
    }


    public override void MouseDrag(Point start, Point end, MouseButtons button) {
      if(button == MouseButtons.Left && Mode == ChartMode.Select) {
        PointD a = TransformPixelToWorld(start);
        PointD b = TransformPixelToWorld(end);
        double minX = Math.Min(a.X, b.X);
        double minY = Math.Min(a.Y, b.Y);
        double maxX = Math.Max(a.X, b.X);
        double maxY = Math.Max(a.Y, b.Y);
        HeuristicLab.Charting.Rectangle rect = new HeuristicLab.Charting.Rectangle(this, minX, minY, maxX, maxY);

        List<IPrimitive> primitives = new List<IPrimitive>();
        primitives.AddRange(points.Primitives);

        foreach(FixedSizeCircle p in primitives) {
          if(rect.ContainsPoint(p.Point)) {
            Record r;
            primitiveToRecordDictionary.TryGetValue(p, out r);
            if(r != null) r.ToggleSelected();
          }
        }
        results.FireChanged();
      } else {
        base.MouseDrag(start, end, button);
      }
    }

    public override void MouseClick(Point point, MouseButtons button) {
      if(button == MouseButtons.Left) {
        Record r = GetRecord(point);
        if(r != null) r.ToggleSelected();
        results.FireChanged();
      } else {
        base.MouseClick(point, button);
      }
    }

    public override void MouseDoubleClick(Point point, MouseButtons button) {
      if(button == MouseButtons.Left) {
        Record r = GetRecord(point);
        if(r != null) r.OpenModel();
      } else {
        base.MouseDoubleClick(point, button);
      }
    }
  }
}