#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2012 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.Drawing;
using System.Linq;
using System.Windows.Forms.DataVisualization.Charting;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;

namespace HeuristicLab.Problems.DataAnalysis.Symbolic.Views {
  [View("Sliding Window View")]
  [Content(typeof(SlidingWindowData), IsDefaultView = true)]
  public partial class SlidingWindowDataView : ItemView {
    private const string TARGETVARIABLE_SERIES_NAME = "Target Variable";
    private const string ESTIMATEDVAlUES_SERIES_NAME = "Estimated Values";

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

    public SlidingWindowDataView() {
      InitializeComponent();
      chart.CustomizeAllChartAreas();
      chart.ChartAreas[0].CursorX.IsUserSelectionEnabled = true;
      chart.ChartAreas[0].AxisX.ScaleView.Zoomable = true;
      chart.ChartAreas[0].AxisX.IsStartedFromZero = true;
      chart.ChartAreas[0].CursorX.Interval = 1;

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

      StripLine stripLine = new StripLine();
      stripLine.BackColor = Color.Gold;
      stripLine.Font = new Font("Times New Roman", 12, FontStyle.Bold);
      stripLine.Text = "Sliding Window";
      chart.ChartAreas[0].AxisX.StripLines.Add(stripLine);
    }

    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.SlidingWindowPosition.ValueChanged += new EventHandler(SlidingWindowPosition_ValueChanged);
      Content.EstimatedValuesChanged += new EventHandler(EstimatedValuesChanged);
    }
    protected override void DeregisterContentEvents() {
      Content.SlidingWindowPosition.ValueChanged -= new EventHandler(SlidingWindowPosition_ValueChanged);
      Content.EstimatedValuesChanged -= new EventHandler(EstimatedValuesChanged);
      base.DeregisterContentEvents();
    }

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

    private void SlidingWindowPosition_ValueChanged(object sender, EventArgs e) {
      if (InvokeRequired) Invoke((Action<object, EventArgs>)SlidingWindowPosition_ValueChanged, sender, e);
      else UpdateStripLine();
    }
    private void EstimatedValuesChanged(object sender, EventArgs e) {
      if (InvokeRequired) Invoke((Action<object, EventArgs>)EstimatedValuesChanged, sender, e);
      else RedrawChart();
    }

    private void RedrawChart() {
      chart.Series.Clear();
      if (Content == null) return;

      chart.Series.Add(TARGETVARIABLE_SERIES_NAME);
      chart.Series[TARGETVARIABLE_SERIES_NAME].ChartType = SeriesChartType.FastLine;
      var xValues = Enumerable.Range(Content.TrainingPartitionStart + 1, Content.TrainingPartitionEnd - Content.TrainingPartitionStart).ToArray();
      chart.Series[TARGETVARIABLE_SERIES_NAME].Points.DataBindXY(xValues, Content.TargetValues.ToArray());

      if (Content.EstimatedValues.Any()) {
        chart.Series.Add(ESTIMATEDVAlUES_SERIES_NAME);
        chart.Series[ESTIMATEDVAlUES_SERIES_NAME].ChartType = SeriesChartType.FastLine;
        var yValues = Content.EstimatedValues.ToArray();
        chart.Series[ESTIMATEDVAlUES_SERIES_NAME].Points.DataBindXY(xValues, yValues);
      }

      UpdateStripLine();
      UpdateCursorInterval();
    }

    private void UpdateStripLine() {
      chart.ChartAreas[0].AxisX.StripLines[0].StripWidth = Content.SlidingWindowPosition.End - Content.SlidingWindowPosition.Start;
      chart.ChartAreas[0].AxisX.StripLines[0].IntervalOffset = Content.SlidingWindowPosition.Start - 0.5;
    }

    private void UpdateCursorInterval() {
      var targetValues = this.chart.Series[TARGETVARIABLE_SERIES_NAME].Points.Select(x => x.YValues[0]).DefaultIfEmpty(1.0);
      double targetValuesRange = targetValues.Max() - targetValues.Min();
      double interestingValuesRange = Math.Max(targetValuesRange, 1.0);
      double digits = (int)Math.Log10(interestingValuesRange) - 3;
      double yZoomInterval = Math.Max(Math.Pow(10, digits), 10E-5);
      this.chart.ChartAreas[0].CursorY.Interval = yZoomInterval;
    }
  }
}