#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 System.Windows.Forms;
using HeuristicLab.DataImporter.Data.CommandBase;
using HeuristicLab.DataImporter.Data.Model;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.DataImporter.Data.Command {
  [StorableClass]
  public class PasteValuesCommand : ColumnGroupCommandBase {
    [Storable]
    private IComparable[,] newValues;
    [Storable]
    private int columnIndex;
    [Storable]
    private int rowIndex;

    private IComparable[,] oldValues;
    private int insertedRows;
    private ICollection<int> oldSortedColumnIndices;
    private IEnumerable<SortOrder> oldSortOrder;

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

    public PasteValuesCommand(DataSet dataSet, string columnGroupName, int columnIndex, int rowIndex, string values)
      : base(dataSet, columnGroupName) {
      this.columnIndex = columnIndex;
      this.rowIndex = rowIndex;

      string[] lines = values.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
      string[] cells;
      for (int i = 0; i < lines.Length; i++) {
        cells = lines[i].Split('\t');
        if (this.newValues == null) {
          newValues = new IComparable[cells.Length, lines.Length];
        }
        for (int j = 0; j < cells.Length; j++)
          newValues[j, i] = string.IsNullOrEmpty(cells[j]) ? null : cells[j];
      }
    }

    public override void Execute() {
      base.Execute();
      oldValues = new IComparable[
        Math.Min(ColumnGroup.Columns.Count() - columnIndex, newValues.GetLength(0)),
        Math.Min(ColumnGroup.RowCount - rowIndex, newValues.GetLength(1))];
      bool rowAdded = false;
      oldSortedColumnIndices = new List<int>(ColumnGroup.SortedColumnIndexes);
      oldSortOrder = ColumnGroup.SortOrdersForColumns.ToList();
      for (int row = 0; row < newValues.GetLength(1); row++) {
        if (row + rowIndex >= ColumnGroup.RowCount) {
          ColumnGroup.AddRow(ColumnGroup.GetEmptyRow());
          this.insertedRows++;
          rowAdded = true;
        }
        for (int col = 0; col < newValues.GetLength(0); col++) {
          if (col + columnIndex < ColumnGroup.Columns.Count()) {
            if (!rowAdded)
              oldValues[col, row] = ColumnGroup.Columns.ElementAt(col + columnIndex).GetValue(row + rowIndex);
            ColumnGroup.Columns.ElementAt(col + columnIndex).ChangeValueOrNull(row + rowIndex, newValues[col, row]);
          }
        }
      }
      ColumnGroup.FireChanged();
      this.ColumnGroup = null;
    }

    public override void UndoExecute() {
      base.UndoExecute();
      for (int row = 0; row < oldValues.GetLength(1); row++) {
        for (int col = 0; col < oldValues.GetLength(0); col++) {
          ColumnGroup.Columns.ElementAt(col + columnIndex).ChangeValue(row + rowIndex, oldValues[col, row]);
        }
      }
      for (int i = 0; i < insertedRows; i++)
        ColumnGroup.DeleteRow(ColumnGroup.RowCount - 1);
      oldValues = null;
      insertedRows = 0;
      ColumnGroup.SortOrdersForColumns = oldSortOrder;
      ColumnGroup.SortedColumnIndexes = oldSortedColumnIndices;
      oldSortedColumnIndices = null;
      oldSortOrder = null;
      ColumnGroup.FireChanged();
      this.ColumnGroup = null;
    }

    public override string Description {
      get { return "Copied values pasted"; }
    }
  }
}