#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.Collections.Generic;
using System.Linq;
using HeuristicLab.DataPreprocessing.Filter;
using HeuristicLab.DataPreprocessing.Interfaces;
namespace HeuristicLab.DataPreprocessing {
  public class FilterLogic : IFilterLogic {

    private IFilteredPreprocessingData preprocessingData;

    public FilterLogic(IFilteredPreprocessingData preprocessingData) {
      this.preprocessingData = preprocessingData;
    }



    public bool[] Preview(IList<IFilter> filters, bool isAndCombination) {
      IList<IFilter> activeFilters = filters.Where(f => f.Active && f.ConstraintData != null).ToList<IFilter>();

      if (activeFilters.Count == 0) {
        return new bool[preprocessingData.Rows];
      }

      bool[] result = CreateBoolArray(preprocessingData.Rows, isAndCombination);

      foreach (IFilter filter in activeFilters) {
        bool[] filterResult = filter.Check();
        for (int row = 0; row < result.Length; ++row) {
          result[row] = Result(result[row], filterResult[row], isAndCombination);
        }
      }

      preprocessingData.SetFilter(result);

      return result;
    }

    public bool[] CreateBoolArray(int rows, bool value) {
      return Enumerable.Repeat<bool>(value, rows).ToArray();
    }

    public bool Result(bool current, bool addition, bool isAndCombination) {
      return isAndCombination ? current && addition : current || addition;
    }

    public void Apply(IList<IFilter> filters, bool isAndCombination) {
      preprocessingData.SetFilter(Preview(filters, isAndCombination));
      preprocessingData.PersistFilter();
    }

    public void Reset() {
      preprocessingData.ResetFilter();
    }

    public IPreprocessingData PreprocessingData {
      get { return preprocessingData; }
    }
  }
}