#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.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 not equidistant rows", 1, ColumnGroupState.Sorted, "Time Series",
Position = 1, OptionsView = typeof(TimeBasedCommandView))]
  public class DeleteNotEquidistantRowsCommand : EquidistantTimeSeriesCommandBase {
    private DateTimeColumn columnToSample;
    private List<ColumnBase> oldColumns;
    private ICollection<int> oldSortedColumnIndices;
    private IEnumerable<SortOrder> oldSortOrder;

    [StorableConstructor]
    protected DeleteNotEquidistantRowsCommand(bool deserializing)
      : base(deserializing) {
      oldColumns = new List<ColumnBase>();
    }

    public DeleteNotEquidistantRowsCommand(DataSet dataSet, string columnGroupName)
      : base(dataSet, columnGroupName) {
      oldColumns = new List<ColumnBase>();
    }

    public override string Description {
      get { return "Delete not equidistant rows"; }
    }

    public override void Execute() {
      base.Execute();
      if (!(ColumnGroup.GetColumn(ColumnGroup.SortedColumnIndexes.ElementAt(0)) is DateTimeColumn)
        || ColumnGroup.SortedColumnIndexes.Count != 1)
        throw new CommandExecutionException("ColumnGroup must be sorted after a datetime column.", this);
      columnToSample = (DateTimeColumn)ColumnGroup.GetColumn(ColumnGroup.SortedColumnIndexes.ElementAt(0));
      if (columnToSample.SortOrder != SortOrder.Ascending)
        throw new CommandExecutionException("ColumnGroup must be sorted ascending after the selected datetime column.", this);
      if (columnToSample.ContainsNullValues)
        throw new CommandExecutionException("The datetime column must not contain null values.", this);

      oldSortedColumnIndices = new List<int>(ColumnGroup.SortedColumnIndexes);
      oldSortOrder = ColumnGroup.SortOrdersForColumns.ToList();

      DateTime value;
      DateTime actPoint = StartTime;
      ColumnGroup tempColumnGroup = new ColumnGroup();
      List<int> positions = new List<int>();

      for (int i = 0; i < ColumnGroup.RowCount; i++) {
        value = (DateTime)columnToSample.GetValue(i);
        while (actPoint < value)
          actPoint += SampleFrequency;
        if (actPoint == value) {
          positions.Add(i);
        }
      }

      foreach (ColumnBase x in ColumnGroup.Columns) {
        oldColumns.Add(x);
        tempColumnGroup.AddColumn(x.CreateCopyOfColumnWithoutValues());
      }

      for (int i = 0; i < positions.Count; i++)
        tempColumnGroup.AddRow(ColumnGroup.GetRow(positions[i]));

      for (int i = 0; i < ColumnGroup.Columns.Count(); i++)
        ColumnGroup.ReplaceColumn(i, tempColumnGroup.Columns.ElementAt(i));

      ColumnGroup.SortOrdersForColumns = oldSortOrder;
      ColumnGroup.SortedColumnIndexes = oldSortedColumnIndices;
      ColumnGroup.FireChanged();
      this.ColumnGroup = null;
    }

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