#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.Linq;
using System.Text;
using System.IO;
using System.Globalization;
using HeuristicLab.DataImporter.Data.Model;
using HeuristicLab.DataImporter.DataProcessor;

namespace HeuristicLab.DataImporter.Backend.Csv {
  public class CsvExporter : IExporter{
    public string Description {
      get { return "Export as CSV file"; }
    }

    private CsvExporterView view;
    public System.Windows.Forms.UserControl SettingsControl {
      get {
        if (view == null)
          view = new CsvExporterView();
        return view;
      }
    }

    public void Export(DataSet dataSet) {
      StreamWriter stream = new StreamWriter(view.FileName, false);      
      if (dataSet.ColumnGroups.Count() != 0) {
        StringBuilder sb = new StringBuilder();
        if (view.IncludeColumnNames) {
          foreach (ColumnGroup grp in dataSet.ColumnGroups)
            foreach (ColumnBase col in grp.Columns)
              sb.Append(col.Name + ';');
          sb.Remove(sb.Length - 1, 1);
          sb.Append(Environment.NewLine);
          stream.Write(sb);
          sb.Remove(0, sb.Length);
        }

        IComparable value;
        for (int i = 0; i < dataSet.ColumnGroups.Max(x => x.RowCount); i++) {
          foreach (ColumnGroup grp in dataSet.ColumnGroups) {
              foreach (ColumnBase col in grp.Columns) {
                value = col.GetValue(i);
                if (value == null)
                  sb.Append(';');
                else if (value is double)
                  sb.Append(((double)value).ToString(CultureInfo.InvariantCulture) + ';');
                else
                  sb.Append(value.ToString() + ';');
              }
          } //foreach columngroup
          sb.Remove(sb.Length - 1, 1);
          sb.Append(Environment.NewLine);
          if (i % 100 == 0) {
            stream.Write(sb.ToString());
            sb.Remove(0, sb.Length);
          }
        } //foreach row
        stream.Write(sb);
      }
      stream.Close();
    }
  }
}