#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2015 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 System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;
using HeuristicLab.BioBoost.Representation;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.BioBoost.Views {

  [Content(typeof (ItemCollection<BioBoostCompoundSolution>), false)]
  public partial class BioBoostParetoSetView : ItemView {

    private Point mouseDownPos;

    public new ItemCollection<BioBoostCompoundSolution> Content {
      get { return (ItemCollection<BioBoostCompoundSolution>)base.Content; }
      set { base.Content = value; }
    }

    public BioBoostParetoSetView() {
      InitializeComponent();
    }

    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.ItemsAdded += UpdateChart;
      Content.ItemsRemoved += UpdateChart;
      Content.CollectionReset += UpdateChart;
    }

    protected override void DeregisterContentEvents() {
      base.DeregisterContentEvents();
      Content.CollectionReset -= UpdateChart;
      Content.ItemsRemoved -= UpdateChart;
      Content.CollectionReset -= UpdateChart;
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      UpdateChart(this, EventArgs.Empty);
    }

    protected virtual void UpdateChart(object sender, EventArgs args) {
      if (InvokeRequired) {
        Invoke(new EventHandler(UpdateChart), sender, args);
      } else {
        try {
          if (paretoSetChart.IsDisposed) return;
          var points = paretoSetChart.Series[0].Points;
          if (Content == null) {
            points.Clear();
            return;
          }
          var newPoints = Content.Where(solution => solution.Qualities.Length >= 2).Select(s => new { x = s.Qualities[0], y = s.Qualities[1], solution = s}).ToList();
          if (newPoints.Count > 0) {
            var chartArea = paretoSetChart.ChartAreas[0];
            AdaptAxis(chartArea.AxisX, newPoints.Select(p => p.x), 1);
            AdaptAxis(chartArea.AxisY, newPoints.Select(p => p.y), 1);
            paretoSetChart.BeginInit();
            points.Clear();
            foreach (var point in newPoints) {
              points.Add(new DataPoint(point.x, point.y) {
                Tag = point.solution,
              });
            }
            paretoSetChart.EndInit();
          }
        } catch (Exception x) {
          ErrorHandling.ShowErrorDialog(x);
        }
      }
    }

    private void AdaptAxis(Axis axis, IEnumerable<double> values, int precision = 0, double overshot = 0.5, double margin = 0.25) {
      var newMax = values.Max();
      var newMin = values.Min();
      var range = newMax - newMin;
      newMax = newMax + range*margin;
      newMin = newMin - range*margin;
      if (range == 0) return;
      var oldRange = axis.Maximum - axis.Minimum;
      if (range*3 < oldRange) {
        axis.Maximum = Math.Round(newMax+range*overshot, precision);
        axis.Minimum = Math.Round(newMin-range*overshot , precision);
      } else {
        if (newMax > axis.Maximum) axis.Maximum = Math.Round(newMax+range*overshot, precision);
        if (newMin < axis.Minimum) axis.Minimum = Math.Round(newMin-range*overshot, precision);
      }
    }

    private void paretoSetChart_MouseDown(object sender, MouseEventArgs e) { mouseDownPos = e.Location; }
    private void paretoSetChart_DoubleClick(object sender, EventArgs e) {
      var pos = mouseDownPos;
      var result = paretoSetChart.HitTest(pos.X, pos.Y, ChartElementType.DataPoint);
      var point = result.Object as DataPoint;
      if (point != null && point.Tag is IContent)
        MainFormManager.MainForm.ShowContent((IContent)point.Tag);
    }


  }
}