#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.CommandBase;
using HeuristicLab.DataImporter.Data.Model;
using HeuristicLab.DataImporter.Data;
using HeuristicLab.DataImporter.Command.View;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.DataImporter.Command {
  [StorableClass]
  [ViewableCommandInfoAttribute("Equidistant Sampling", 1, ColumnGroupState.Sorted, "Time Series",
Position = 0, OptionsView = typeof(TimeBasedCommandView))]
  public class EquidistantSamplingCommand : EquidistantTimeSeriesCommandBase {
    private List<int> insertedRows;
    private DateTimeColumn columnToSample;

    private EquidistantSamplingCommand()
      : base(null, string.Empty) {
    }

    public EquidistantSamplingCommand(DataSet dataSet, string columnGroupName)
      : base(dataSet, columnGroupName) {
    }

    public override string Description {
      get { return "Equidistant Sampling"; }
    }

    public override void Execute() {
      base.Execute();
      if (!(ColumnGroup.GetColumn(ColumnGroup.SortedColumnIndexes.ElementAt(0)) is DateTimeColumn)
    || ColumnGroup.SortedColumnIndexes.Count != 1)
        throw new CommandExecutionException("ColumnGroup mus be sorted a the 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);

      for (int i = 1; i < columnToSample.TotalValuesCount; i++) {
        if (columnToSample.GetValue(i) == columnToSample.GetValue(i - 1))
          throw new CommandExecutionException("The datetime column must not contain duplicate values.", this);
      }

      insertedRows = new List<int>();
      DateTime actPoint = StartTime;
      int j = 0;
      IComparable[] row;
      while (j < columnToSample.TotalValuesCount &&
        actPoint <= ((DateTime)columnToSample.GetValue(columnToSample.TotalValuesCount - 1)) + SampleFrequency) {
        if (actPoint < (DateTime)columnToSample.GetValue(j)) {
          row = ColumnGroup.GetEmptyRow();
          row[ColumnGroup.SortedColumnIndexes.ElementAt(0)] = actPoint;
          ColumnGroup.InsertRow(j, row);
          actPoint = actPoint + SampleFrequency;
          insertedRows.Add(j);
        } else if (actPoint == (DateTime)columnToSample.GetValue(j))
          actPoint = actPoint + SampleFrequency;
        j++;
      }
      ColumnGroup.FireChanged();
      this.ColumnGroup = null;
    }

    public override void UndoExecute() {
      base.UndoExecute();
      for (int i = insertedRows.Count - 1; i >= 0; i--)
        ColumnGroup.DeleteRow(insertedRows[i]);
      insertedRows.Clear();
      ColumnGroup.FireChanged();
      this.ColumnGroup = null;
    }
  }
}