using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Xml;
using System.Windows.Forms;
using HeuristicLab.DataImporter.Data;
using HeuristicLab.DataImporter.Data.Model;
using HeuristicLab.DataImporter.Data.CommandBase;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.DataImporter.Backend.Hl2ImporterFormat {
  [StorableClass]
  public class Hl2ImporterCommand : DataSetCommandBase {
    private ColumnGroup newColumnGroup;

    private Hl2ImporterCommand()
      : base(null) {
    }

    public Hl2ImporterCommand(DataSet dataSet)
      : base(dataSet) {
    }

    public override string Description {
      get { return "Import HL2 file"; }
    }

    [Storable]
    private string fileName;
    public string FileName {
      get { return fileName; }
      set { this.fileName = value; }
    }

    public override void Execute() {
      base.Execute();
      newColumnGroup = new ColumnGroup(fileName.Substring(fileName.LastIndexOf('\\') + 1));
      StreamReader reader = new StreamReader(fileName);
      string firstLine = reader.ReadLine();
      string[] variableNames = new string[0];

      //skip meta information && extract variable/column names
      while (firstLine.Trim()[0] == Hl2Exporter.METATAG[0]) {
        if (firstLine.Contains(Hl2Exporter.VARIABLENAMES)) {
          firstLine = firstLine.Replace(Hl2Exporter.METATAG + Hl2Exporter.VARIABLENAMES + "=", "");
          variableNames = firstLine.Split(new char[] { ';' });
        }
        firstLine = reader.ReadLine();
      }
      string[] values = firstLine.Split(new char[] { ';' });
      for (int i = 0; i < values.Length; i++) {
        if (i < variableNames.Length)
          newColumnGroup.AddColumn(new StringColumn(variableNames[i]));
        else
          newColumnGroup.AddColumn(new StringColumn("Column " + i));
      }

      while (!reader.EndOfStream) {
        newColumnGroup.AddRow(reader.ReadLine().Split(new char[] { ';' }));
      }
      reader.Close();
      DataSet.AddColumnGroup(newColumnGroup);
      DataSet.FireChanged();
    }

    public override void UndoExecute() {
      base.UndoExecute();
      DataSet.RemoveColumnGroup(newColumnGroup);
      newColumnGroup = null;
      DataSet.FireChanged();
    }
  }
}