#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2013 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 HeuristicLab.DataImporter.Command.View;
using HeuristicLab.DataImporter.Data;
using HeuristicLab.DataImporter.Data.CommandBase;
using HeuristicLab.DataImporter.Data.Model;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.DataImporter.Command {
  [StorableClass]
  [ViewableCommandInfoAttribute("Delete Columns beneath Threshold", 1, ColumnGroupState.AnySelectedColumnContainsNull,
    "Handle Missing Values", Position = 6, OptionsView = typeof(DeleteWithThresholdView))]
  public class DeleteColumnsWithMissingValuesThresholdCommand : ColumnGroupCommandWithAffectedColumnsBase, IThresholdCommand {
    private ColumnBase oldColumn;
    private int oldColumnIndex;

    [Storable]
    private double threshold = 0.8;
    public double Threshold { get { return threshold; } set { threshold = value; } }

    [StorableConstructor]
    protected DeleteColumnsWithMissingValuesThresholdCommand(bool deserializing) : base(deserializing) { }

    public DeleteColumnsWithMissingValuesThresholdCommand(DataSet dataSet, string columnGroupName, int[] affectedColumns)
      : base(dataSet, columnGroupName, affectedColumns) {
    }

    public override void Execute() {
      base.Execute();

      oldColumnIndex = AffectedColumns[0];

      oldColumn = ColumnGroup.GetColumn(oldColumnIndex);
      if ((double)oldColumn.NonNullValuesCount / (double)oldColumn.TotalValuesCount < Threshold) {
        ColumnGroup.RemoveColumn(oldColumn);
      } else {
        oldColumn = null;
      }

      ColumnGroup.FireChanged();
      ColumnGroup = null;
    }

    public override void UndoExecute() {
      base.UndoExecute();
      if (oldColumn != null) {
        ColumnGroup.InsertColumn(oldColumnIndex, oldColumn);
      }
      oldColumn = null;
      oldColumnIndex = -1;
      ColumnGroup.FireChanged();
      ColumnGroup = null;
    }

    public override string Description {
      get { return "Delete columns with a missing value percentage beneath a certain threshold"; }
    }
  }
}