#region License Information

/* HeuristicLab
 * Copyright (C) 2002-2014 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.Collections.ObjectModel;
using System.Globalization;
using System.Linq;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Problems.DataAnalysis {
  [Item("SimpleDataset", "A dataset which allows access to a single row of updateable variables")]
  [StorableClass]
  public class SimpleDataset : NamedItem, IDataset {
    [Storable]
    private List<string> names;

    [Storable]
    private List<double> values;

    public int Rows {
      get { return 1; }
      set { throw new InvalidOperationException(); }
    }

    public int Columns {
      get { return names.Count; }
      set { throw new InvalidOperationException(); }
    }

    public IEnumerable<string> ColumnNames { get; set; }
    public IEnumerable<string> RowNames { get; set; }
    public bool SortableView { get; set; }
    public bool ReadOnly { get; private set; }
    public bool Validate(string value, out string errorMessage) { throw new NotImplementedException(); }
    public string GetValue(int rowIndex, int columnIndex) { throw new NotImplementedException(); }
    public bool SetValue(string value, int rowIndex, int columnIndex) { throw new NotImplementedException(); }

    public event EventHandler ColumnsChanged;
    public event EventHandler RowsChanged;
    public event EventHandler ColumnNamesChanged;
    public event EventHandler RowNamesChanged;
    public event EventHandler SortableViewChanged;
    public event EventHandler<EventArgs<int, int>> ItemChanged;
    public event EventHandler Reset;

    public SimpleDataset() { }

    public SimpleDataset(IEnumerable<string> variableNames, IEnumerable<double> variableValues) {
      if (variableNames.Count() != variableValues.Count())
        throw new ArgumentException("The variable names and values should be the same length.");
      names = new List<string>(variableNames);
      values = new List<double>(variableValues);
    }

    private SimpleDataset(SimpleDataset original, Cloner cloner)
      : base(original, cloner) {
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new SimpleDataset(this, cloner);
    }

    [StorableConstructor]
    private SimpleDataset(bool deserializing)
      : base(deserializing) {
    }

    public double GetDoubleValue(string variableName, int row) {
      int i = names.IndexOf(variableName);
      if (i == -1)
        throw new ArgumentException("The given variable name is not present in the dataset.");
      return values[names.IndexOf(variableName)];
    }

    public IEnumerable<T> GetValues<T>(string variableName, IEnumerable<int> rows) {
      throw new NotImplementedException();
    }

    public IEnumerable<T> GetValues<T>(string variableName) {
      throw new NotImplementedException();
    }

    public IEnumerable<double> GetDoubleValues(string variableName, IEnumerable<int> rows) {
      yield return GetDoubleValue(variableName, 0);
    }

    public IEnumerable<double> GetDoubleValues(string variableName) {
      yield return GetDoubleValue(variableName, 0);
    }

    public ReadOnlyCollection<double> GetReadOnlyDoubleValues(string variableName) {
      return GetDoubleValues(variableName, Enumerable.Empty<int>()).ToList().AsReadOnly();
    }

    public IEnumerable<string> GetStringValues(string variableName) {
      yield return GetDoubleValue(variableName, 0).ToString(CultureInfo.InvariantCulture);
    }

    public IEnumerable<DateTime> GetDateTimeValues(string variableName) {
      throw new NotImplementedException();
    }

    public void SetDoubleValue(string variableName, double value) {
      int i = names.IndexOf(variableName);
      if (i == -1)
        throw new ArgumentException("The given variable name is not present in the dataset.");
    }

    public IEnumerable<string> VariableNames {
      get { return names; }
      set {
        if (value.Count() != values.Count())
          throw new ArgumentException("The names count should equal the values count.");
        names = value.ToList();
      }
    }

    public IEnumerable<double> VariableValues {
      get { return values; }
      set {
        if (value.Count() != names.Count())
          throw new ArgumentException("The values count should equal the names count.");
        values = new List<double>(value);
      }
    }

    public IEnumerable<string> DoubleVariables {
      get { return names; } // all variables are of type double 
    }
  }
}