#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.Collections.Specialized;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using HeuristicLab.Common;
using HeuristicLab.MainForm;
using HeuristicLab.Problems.DataAnalysis;
using HeuristicLab.MainForm.WindowsForms;
using System.Windows.Forms.DataVisualization.Charting;

namespace HeuristicLab.Problems.DataAnalysis.Views {
  [View("Line Chart View")]
  [Content(typeof(DataAnalysisSolution))]
  public partial class LineChartView : AsynchronousContentView {
    private const string TARGETVARIABLE_SERIES_NAME = "TargetVariable";
    private const string ESTIMATEDVALUES_SERIES_NAME = "EstimatedValues";

    public new DataAnalysisSolution Content {
      get { return (DataAnalysisSolution)base.Content; }
      set {
        base.Content = value;
      }
    }

    public LineChartView()
      : base() {
      InitializeComponent();
      this.Caption = "Line Chart View";
      //configure axis
      this.chart.ChartAreas[0].CursorX.IsUserSelectionEnabled = true;
      this.chart.ChartAreas[0].AxisX.ScaleView.Zoomable = true;
      this.chart.ChartAreas[0].CursorX.Interval = 0;

      this.chart.ChartAreas[0].CursorY.IsUserSelectionEnabled = true;
      this.chart.ChartAreas[0].AxisY.ScaleView.Zoomable = true;
      this.chart.ChartAreas[0].CursorY.Interval = 0;
    }

    private void RedrawChart() {
      this.chart.Series.Clear();
      this.chart.Series.Add(TARGETVARIABLE_SERIES_NAME);
      this.chart.Series[TARGETVARIABLE_SERIES_NAME].LegendText = Content.ProblemData.TargetVariable.Value;
      this.chart.Series[TARGETVARIABLE_SERIES_NAME].ChartType = SeriesChartType.FastLine;
      this.chart.Series[TARGETVARIABLE_SERIES_NAME].Points.DataBindY(Content.ProblemData.Dataset[Content.ProblemData.TargetVariable.Value]);
      this.UpdateStripLines();

      this.chart.Series.Add(ESTIMATEDVALUES_SERIES_NAME);
      this.chart.Series[ESTIMATEDVALUES_SERIES_NAME].LegendText = Content.ItemName;
      this.chart.Series[ESTIMATEDVALUES_SERIES_NAME].ChartType = SeriesChartType.FastLine;
      this.chart.Series[ESTIMATEDVALUES_SERIES_NAME].Points.DataBindY(Content.EstimatedValues.ToArray());
      this.chart.Series[ESTIMATEDVALUES_SERIES_NAME].Tag = Content;
    }

    #region events
    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.EstimatedValuesChanged += new EventHandler(Content_EstimatedValuesChanged);
      Content.ProblemDataChanged += new EventHandler(Content_ProblemDataChanged);
    }

    protected override void DeregisterContentEvents() {
      base.DeregisterContentEvents();
      Content.EstimatedValuesChanged -= new EventHandler(Content_EstimatedValuesChanged);
      Content.ProblemDataChanged -= new EventHandler(Content_ProblemDataChanged);
    }

    void Content_ProblemDataChanged(object sender, EventArgs e) {
      RedrawChart();
    }

    void Content_EstimatedValuesChanged(object sender, EventArgs e) {
      UpdateEstimatedValuesLineChart();
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      RedrawChart();
    }

    private void UpdateEstimatedValuesLineChart() {
      if (InvokeRequired) Invoke((Action)UpdateEstimatedValuesLineChart);
      else {
        if (this.chart.Series.Count > 0) {
          Series s = this.chart.Series.SingleOrDefault(x => x.Tag == Content);
          if (s != null) {
            s.Points.DataBindY(Content.EstimatedValues.ToArray());
            s.LegendText = Content.ItemName;
            this.UpdateStripLines();
          }
        }
      }
    }
    #endregion

    private void UpdateStripLines() {
      this.chart.ChartAreas[0].AxisX.StripLines.Clear();
      this.CreateAndAddStripLine("Training", Color.FromArgb(20, Color.Green),
        Content.ProblemData.TrainingSamplesStart.Value,
        Content.ProblemData.TrainingSamplesEnd.Value);
      this.CreateAndAddStripLine("Test", Color.FromArgb(20, Color.Red),
        Content.ProblemData.TestSamplesStart.Value,
        Content.ProblemData.TestSamplesEnd.Value);
    }

    private void CreateAndAddStripLine(string title, Color c, int start, int end) {
      StripLine stripLine = new StripLine();
      stripLine.BackColor = c;
      stripLine.Text = title;
      stripLine.Font = new Font("Times New Roman", 12, FontStyle.Bold);
      stripLine.StripWidth = end - start;
      stripLine.IntervalOffset = start;
      this.chart.ChartAreas[0].AxisX.StripLines.Add(stripLine);
    }
  }
}