#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.DataProcessor;
using HeuristicLab.DataImporter.Data.Model;

namespace HeuristicLab.DataImporter.Backend.Hl2ImporterFormat {
  public class Hl2Exporter : IExporter {
    public const string METATAG = "@";
    public const string PROBLEMNAME = "PROBLEMNAME";
    public const string VARIABLENAMES = "VARIABLENAMES";
    public const string TARGETVARIABLE = "TARGETVARIABLE";
    public const string NONINPUTVARIABLES = "NONINPUTVARIABLES";
    public const string MINIMUMTIMEOFFSET = "MINIMUMTIMEOFFSET";
    public const string MAXIMUMTIMEOFFSET = "MAXIMUMTIMEOFFSET";
    public const string MAXIMUMTREEHEIGHT = "MAXIMUMTREEHEIGHT";
    public const string MAXIMUMTREESIZE = "MAXIMUMTREESIZE";
    public const string TRAININGSAMPLESSTART = "TRAININGSAMPLESSTART";
    public const string TRAININGSAMPLESEND = "TRAININGSAMPLESEND";
    public const string VALIDATIONSAMPLESSTART = "VALIDATIONSAMPLESSTART";
    public const string VALIDATIONSAMPLESEND = "VALIDATIONSAMPLESEND";
    public const string TESTSAMPLESSTART = "TESTSAMPLESSTART";
    public const string TESTSAMPLESEND = "TESTSAMPLESEND";


    public string Description {
      get { return "Export data as HL2 importer file"; }
    }

    private Hl2ExporterView view;
    public System.Windows.Forms.UserControl SettingsControl {
      get {
        if (view == null)
          view = new Hl2ExporterView();
        return view;
      }
    }

    public void Export(DataSet dataSet) {
      StreamWriter stream = new StreamWriter(view.FileName, false);
      stream.WriteLine(METATAG + PROBLEMNAME + '=' + view.ProblemName);
      StringBuilder sb = new StringBuilder();
      foreach (ColumnGroup grp in dataSet.ColumnGroups) {
        foreach (ColumnBase col in grp.Columns)
          sb.Append(col.Name + ';');
      }
      sb = sb.Remove(sb.Length - 1, 1);  //remove last ';'
      stream.WriteLine(METATAG + VARIABLENAMES + '=' + sb.ToString());
      sb = sb.Remove(0, sb.Length);
      stream.WriteLine(METATAG + TARGETVARIABLE + '=' + view.TargetVariable);
      stream.WriteLine(METATAG + NONINPUTVARIABLES + '=' + view.NonInputVariables);
      stream.WriteLine(METATAG + MINIMUMTIMEOFFSET + '=' + view.MinimumTimeOffset);
      stream.WriteLine(METATAG + MAXIMUMTIMEOFFSET + '=' + view.MaximumTimeOffset);
      stream.WriteLine(METATAG + MAXIMUMTREEHEIGHT + '=' + view.MaximumTreeHeight);
      stream.WriteLine(METATAG + MAXIMUMTREESIZE + '=' + view.MaximumTreeSize);
      stream.WriteLine(METATAG + TRAININGSAMPLESSTART + '=' + view.TrainingStart);
      stream.WriteLine(METATAG + TRAININGSAMPLESEND + '=' + view.TrainingEnd);
      stream.WriteLine(METATAG + VALIDATIONSAMPLESSTART + '=' + view.ValidationStart);
      stream.WriteLine(METATAG + VALIDATIONSAMPLESEND + '=' + view.ValidationEnd);
      stream.WriteLine(METATAG + TESTSAMPLESSTART + '=' + view.TestStart);
      stream.WriteLine(METATAG + TESTSAMPLESEND + '=' + view.TestEnd);

      for (int i = 0; i < dataSet.ColumnGroups.Max(x => x.RowCount); i++) {
        foreach (ColumnGroup grp in dataSet.ColumnGroups) {
          foreach (ColumnBase col in grp.Columns) {
            if (col.GetValue(i) == null)
              sb.Append(';');
            else if (col.DataType == typeof(double?))
              sb.Append(((double)col.GetValue(i)).ToString("r", CultureInfo.InvariantCulture.NumberFormat) + ';');
            else if (col.DataType == typeof(DateTime?))
              sb.Append(((DateTime)col.GetValue(i)).ToString(CultureInfo.InvariantCulture.DateTimeFormat) + ';');
            else
              sb.Append(col.GetValue(i).ToString() + ';');
          }
        } //foreach columngroup
        sb = 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();
    }

  }
}