#region License Information

/* HeuristicLab
 * Copyright (C) 2002-2016 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;
using System.Windows.Forms.DataVisualization.Charting;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;

namespace HeuristicLab.DatastreamAnalysis.Views {
  [View("DataBarSet")]
  [Content(typeof(DataBarSet), false)]
  public partial class DataBarSetView : ItemView {
    private bool updateInProgress;

    public virtual Image ViewImage {
      get { return HeuristicLab.Common.Resources.VSImageLibrary.Graph; }
    }

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

    public DataBarSetView() : base() {
      InitializeComponent();
      updateInProgress = false;

      this.chart.CustomizeAllChartAreas();
      this.chart.ChartAreas[0].CursorX.IsUserSelectionEnabled = true;
      this.chart.ChartAreas[0].AxisX.ScaleView.Zoomable = true;
      this.chart.ChartAreas[0].AxisX.Title = "Ensembles";
      this.chart.ChartAreas[0].AxisX.Maximum = 0.0;
      this.chart.ChartAreas[0].AxisX.Maximum = Content.Bars.Count;
      //AddCustomLabelsToAxis(this.chart.ChartAreas[0].AxisX);

      this.chart.ChartAreas[0].AxisY.Title = "Estimated Values";
      this.chart.ChartAreas[0].AxisY.IsStartedFromZero = true;
      this.chart.ChartAreas[0].AxisY.Minimum = 0.0;
      this.chart.ChartAreas[0].AxisY.Maximum = 1.0;
      this.chart.ChartAreas[0].AxisY.Interval = 0.1;
      this.chart.ChartAreas[0].CursorY.IsUserSelectionEnabled = true;
      this.chart.ChartAreas[0].AxisX.ScaleView.Zoomable = true;
    }

    private void AddCustomLabelsToAxis(Axis axis) {
      axis.CustomLabels.Clear();

      for(int i = 0; i < Content.Bars.Count; i++) {
        var bar = Content.Bars.Keys.ToList()[i].Value;
        CustomLabel barLabel = new CustomLabel();
        barLabel.Text = bar;
        barLabel.FromPosition = i;
        barLabel.ToPosition = i + 1;
        axis.CustomLabels.Add(barLabel);
      }
    }

    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.BarsPropertyChanged += new EventHandler(Content_BarsChanged);
      Content.BarValuesChanged += new EventHandler(Content_BarValuesChanged);
      Content.ThresholdsPropertyChanged += new EventHandler(Content_ThresholdsChanged);
    }

    protected override void DeregisterContentEvents() {
      base.DeregisterContentEvents();
      Content.BarsPropertyChanged -= new EventHandler(Content_BarsChanged);
      Content.BarValuesChanged -= new EventHandler(Content_BarValuesChanged);
      Content.ThresholdsPropertyChanged -= new EventHandler(Content_ThresholdsChanged);
    }

    private void Content_BarsChanged(object sender, EventArgs e) {
      UpdateChart();
    }

    private void Content_BarValuesChanged(object sender, EventArgs e) {
      UpdateChartValues();
    }

    private void Content_ThresholdsChanged(object sender, EventArgs e) {
      UpdateChart();
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      UpdateChart();
    }
    private void UpdateChart() {
      if (updateInProgress) {
        Invoke((Action) UpdateChart);
      }

      updateInProgress = true;

      // TODO
      // clear the whole chart and redraw everything


      updateInProgress = false;
    }

    private void UpdateChartValues() {
      if (updateInProgress) {
        Invoke((Action)UpdateChart);
      }

      updateInProgress = true;

      // TODO
      // simply update the bars' values

      updateInProgress = false;
    }

    private void AddThresholds() {

      foreach (var threshold in Content.Thresholds) {
        // TODO: add threshold as red bold line to each of bars' conlumns
      }

    }

    private TextAnnotation CreateTextAnnotation(string name, int classIndex, Axis axisX, Axis axisY, double x, double y, ContentAlignment alignment) {
      TextAnnotation annotation = new TextAnnotation();
      annotation.Text = name;
      annotation.AllowMoving = true;
      annotation.AllowResizing = false;
      annotation.AllowSelecting = false;
      annotation.IsSizeAlwaysRelative = true;
      annotation.ClipToChartArea = chart.ChartAreas[0].Name;
      annotation.Tag = classIndex;
      annotation.AxisX = axisX;
      annotation.AxisY = axisY;
      annotation.Alignment = alignment;
      annotation.X = x;
      annotation.Y = y;
      return annotation;
    }


    #region user interaction events
    private void chart_MouseMove(object sender, MouseEventArgs e) {
      HitTestResult result = chart.HitTest(e.X, e.Y);
      if (result.ChartElementType == ChartElementType.LegendItem)
        this.Cursor = Cursors.Hand;
      else
        this.Cursor = Cursors.Default;
    }

    private void chart_MouseDown(object sender, MouseEventArgs e) {
      HitTestResult result = chart.HitTest(e.X, e.Y);
      if (result.ChartElementType == ChartElementType.LegendItem) {
        if (result.Series != null) ToggleSeries(result.Series);
      }
    }

    private void ToggleSeries(Series series) {
      if (series.Points.Count == 0) {
        // TODO
      } else {
        series.Points.Clear();
      }
    }

    private void chart_AnnotationPositionChanging(object sender, AnnotationPositionChangingEventArgs e) {
      int classIndex = (int)e.Annotation.Tag;
      //double[] thresholds = Content.Model.Thresholds.ToArray();
      //thresholds[classIndex] = e.NewLocationY;
      //Array.Sort(thresholds);
      //Content.Model.SetThresholdsAndClassValues(thresholds, Content.Model.ClassValues);
    }

    private void chart_CustomizeLegend(object sender, CustomizeLegendEventArgs e) {
      foreach (LegendItem legendItem in e.LegendItems) {
        var series = chart.Series[legendItem.SeriesName];
        if (series != null) {
          bool seriesIsInvisible = series.Points.Count == 0;
          foreach (LegendCell cell in legendItem.Cells)
            cell.ForeColor = seriesIsInvisible ? Color.Gray : Color.Black;
        }
      }
    }
    #endregion
  }
}