#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 System;
using System.Collections.Generic;
using System.Linq;
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 Rows", 1, ColumnGroupState.Sorted, "Aggregation", Position = 5)]
  public class DeleteRowsWithDuplicateKeyValuesCommand : ColumnGroupCommandBase {
    private Dictionary<int, IComparable[]> deletedRows;
    [StorableConstructor]
    protected DeleteRowsWithDuplicateKeyValuesCommand(bool deserializing)
      : base(deserializing) {
      deletedRows = new Dictionary<int, IComparable[]>();
    }

    public DeleteRowsWithDuplicateKeyValuesCommand(DataSet dataSet, string columnGroupName)
      : base(dataSet, columnGroupName) {
      deletedRows = new Dictionary<int, IComparable[]>();
    }

    public override string Description {
      get { return "Delete rows with duplicate key values"; }
    }

    public override void Execute() {
      base.Execute();
      if (!ColumnGroup.Columns.Any()) return;
      if (!ColumnGroup.Sorted)
        throw new CommandExecutionException("ColumnGroup must be sorted to delete rows with duplicate key.", this);

      for (int i = 0; i < ColumnGroup.RowCount - 1; i++) {
        if (ColumnGroup.KeyString(i) == ColumnGroup.KeyString(i + 1))
          deletedRows[i + 1] = ColumnGroup.GetRow(i + 1);
      }

      foreach (int i in deletedRows.Keys.Reverse())
        ColumnGroup.DeleteRow(i);

      ColumnGroup.FireChanged();
    }

    public override void UndoExecute() {
      base.UndoExecute();
      foreach (KeyValuePair<int, IComparable[]> deletedRow in deletedRows)
        ColumnGroup.InsertRow(deletedRow.Key, deletedRow.Value);
      deletedRows.Clear();
      ColumnGroup.FireChanged();

    }
  }
}