#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.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
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]
  public abstract class ChangeColumnCommandBase : ColumnGroupCommandWithAffectedColumnsBase {
    [Storable]
    protected Type columnType;

    protected List<ColumnBase> newColumns;
    protected List<ColumnBase> oldColumns;
    protected List<int> positions;
    protected ICollection<int> oldSortedColumnIndexes;
    protected IEnumerable<SortOrder> oldSortOrder;

    private ChangeColumnCommandBase()
      : base(null, string.Empty, null) {
      newColumns = new List<ColumnBase>();
      oldColumns = new List<ColumnBase>();
      positions = new List<int>();
    }

    protected ChangeColumnCommandBase(DataSet dataSet, string columnGroupName, int[] affectedColumns, Type newColumnType) :
      base(dataSet, columnGroupName, affectedColumns) {
      if (!newColumnType.IsSubclassOf(typeof(ColumnBase)))
        throw new CommandExecutionException("Given columntype no subtype of ColumnBase.", this);

      this.columnType = newColumnType;
      newColumns = new List<ColumnBase>();
      oldColumns = new List<ColumnBase>();
      positions = new List<int>();
    }

    public override void Execute() {
      base.Execute();
      ColumnBase newCol;
      ColumnBase oldCol;
      oldSortOrder = ColumnGroup.SortOrdersForColumns.ToList();
      oldSortedColumnIndexes = new List<int>(ColumnGroup.SortedColumnIndexes);
      for (int j = 0; j < AffectedColumns.Length; j++) {
        oldCol = ColumnGroup.Columns.ElementAt(AffectedColumns[j]);
        if (oldCol.GetType() != columnType) {
          positions.Add(AffectedColumns[j]);
          oldColumns.Add(oldCol);
          newCol = (ColumnBase)Activator.CreateInstance(columnType, new object[] { oldCol.Name, oldCol.TotalValuesCount });
          for (int i = 0; i < oldCol.TotalValuesCount; i++)
            newCol.AddValueOrNull(oldCol.GetValue(i));
          newColumns.Add(newCol);
        }
      }

      for (int i = 0; i < positions.Count; i++)
        ColumnGroup.ReplaceColumn(positions[i], newColumns[i]);
      ColumnGroup.FireChanged();
    }

    public override void UndoExecute() {
      base.UndoExecute();
      for (int i = 0; i < positions.Count; i++)
        ColumnGroup.ReplaceColumn(positions[i], oldColumns[i]);
      ColumnGroup.SortOrdersForColumns = oldSortOrder;
      ColumnGroup.SortedColumnIndexes = oldSortedColumnIndexes;
      oldSortedColumnIndexes = null;
      oldSortOrder = null;
      oldColumns.Clear();
      newColumns.Clear();
      positions.Clear();
      ColumnGroup.FireChanged();
    }
  }
}