#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.Globalization;
using System.Linq;
using HeuristicLab.Data;

namespace HeuristicLab.DataPreprocessing {
  public class DataGridLogic : IDataGridLogic {

    private ITransactionalPreprocessingData PreprocessingData { get; private set; }
    private IEnumerable<string> rowNames;

    public int Rows {
      get {
        return PreprocessingData.Rows;
      }
    }

    public int Columns {
      get {
        return PreprocessingData.Columns;
      }
    }

    public IEnumerable<string> ColumnNames {
      get {
        return PreprocessingData.VariableNames;
      }
    }

    public IEnumerable<string> RowNames {
      get {
        return rowNames;
      }
    }

    public DataGridLogic(ITransactionalPreprocessingData preprocessingData) {
      PreprocessingData = preprocessingData;
      createRowNames();
    }

    private void createRowNames() {
      rowNames = Enumerable.Range(1, Rows).Select(n => n.ToString());
    }



    public bool Validate(string value, out string errorMessage, int columnIndex) {
      if (columnIndex < 0 || columnIndex > PreprocessingData.VariableNames.Count()) {
        throw new ArgumentOutOfRangeException("column index is out of range");
      }

      bool valid = false;
      errorMessage = string.Empty;
      if (PreprocessingData.IsType<double>(columnIndex)) {
        double val;
        valid = double.TryParse(value, out val);
        if (!valid) {
          errorMessage = "Invalid Value (Valid Value Format: \"" + FormatPatterns.GetDoubleFormatPattern() + "\")";
        }
      } else if (PreprocessingData.IsType<string>(columnIndex)) {
        valid = value != null;
        if (!valid) {
          errorMessage = "Invalid Value (string must not be null)";
        }
      } else if (PreprocessingData.IsType<DateTime>(columnIndex)) {
        DateTime date;
        valid = DateTime.TryParse(value, out date);
        if (!valid) {
          errorMessage = "Invalid Value (Valid Value Format: \"" + CultureInfo.CurrentCulture.DateTimeFormat + "\"";
        }
      } else {
        throw new ArgumentException("column " + columnIndex + " contains a non supported type.");
      }

      return valid;
    }

    public string GetValue(int columnIndex, int rowIndex) {
      return PreprocessingData.GetCellAsString(columnIndex, rowIndex);
    }

    public bool SetValue(string value, int columnIndex, int rowIndex) {
      bool valid = false;
      if (PreprocessingData.IsType<double>(columnIndex)) {
        double val;
        valid = double.TryParse(value, out val);
        SetValueIfValid(columnIndex, rowIndex, valid, val);
      } else if (PreprocessingData.IsType<string>(columnIndex)) {
        valid = value != null;
        SetValueIfValid(columnIndex, rowIndex, valid, value);
      } else if (PreprocessingData.IsType<DateTime>(columnIndex)) {
        DateTime date;
        valid = DateTime.TryParse(value, out date);
        SetValueIfValid(columnIndex, rowIndex, valid, date);
      } else {
        throw new ArgumentException("column " + columnIndex + " contains a non supported type.");
      }
      return valid;
    }

    private void SetValueIfValid<T>(int columnIndex, int rowIndex, bool valid, T value) {
      if (valid) {
        PreprocessingData.SetCell<T>(columnIndex, rowIndex, value);
      }
    }

    public void DeleteRow(List<int> rows) {
      PreprocessingData.InTransaction(() => {
        foreach (int rowIndex in rows) {
          PreprocessingData.DeleteRow(rowIndex);
        }
      });
      createRowNames();
    }

    public event DataPreprocessingChangedEventHandler Changed {
      add { PreprocessingData.Changed += value; }
      remove { PreprocessingData.Changed -= value; }
    }

    public bool AreAllStringColumns(IEnumerable<int> columnIndices) {
      return columnIndices.All(x => PreprocessingData.IsType<string>(x));
    }


    public void SetSelection(IDictionary<int, IList<int>> selection) {
      PreprocessingData.Selection = selection;
    }

    public IDictionary<int, IList<int>> GetSelection() {
      return PreprocessingData.Selection;
    }
    public void ClearSelection() {
      PreprocessingData.ClearSelection();
    }

    public event EventHandler SelectionChanged {
      add { PreprocessingData.SelectionChanged += value; }
      remove { PreprocessingData.SelectionChanged -= value; }
    }

  }
}