#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;
using System.Linq;
using HEAL.Attic;

namespace HeuristicLab.DataImporter.Data.Model {
  [StorableType("5FAE0F69-2400-4DB9-AA1B-C80298C77A77")]
  public class ProgrammableColumn : ColumnBase {
    private DynamicValueList dynamicValues;
    [Storable]
    private int myIndexInColumnGroup;

    [StorableConstructor]
    protected ProgrammableColumn(StorableConstructorFlag _) : base(_) { }

    public ProgrammableColumn(string columnName, ColumnGroup columnGroup)
      : base(columnName) {
      this.ColumnGroup = columnGroup;
      Expression = string.Empty;
    }

    public override Type DataType {
      get { return typeof(double?); }
    }

    private string expression;
    [Storable]
    public string Expression {
      get { return expression; }
      set {
        expression = value;
        dynamicValues = new DynamicValueList(expression, columnGroup);
        dynamicValues.RecursiveIndex = myIndexInColumnGroup;
      }
    }

    private ColumnGroup columnGroup;
    [Storable]
    private ColumnGroup ColumnGroup {
      get { return this.columnGroup; }
      set {
        if (this.columnGroup != null)
          this.columnGroup.Changed -= new EventHandler(columnGroup_Changed);
        this.columnGroup = value;
        RefreshMyIndex();
        if (this.columnGroup != null)
          columnGroup.Changed += new EventHandler(columnGroup_Changed);
      }
    }

    public void columnGroup_Changed(object sender, EventArgs e) {
      RefreshMyIndex();
      dynamicValues.RecursiveIndex = myIndexInColumnGroup;
    }

    private void RefreshMyIndex() {
      // find the index of this column to prevent recursive expressions
      for (int i = 0; i < columnGroup.Columns.Count(); i++) {
        if (columnGroup.GetColumn(i) == this) {
          myIndexInColumnGroup = i;
          return;
        }
      }
      myIndexInColumnGroup = columnGroup.Columns.Count();
    }

    public override string ToString() {
      return base.ToString() + " <Programmable>\n" + expression;
    }

    protected override IList Values {
      get { return (IList)dynamicValues; }
    }

    public override void AddValue(IComparable value) {
      dynamicValues.IncreaseLength();
    }

    public override void AddValueOrNull(IComparable value) {
      dynamicValues.IncreaseLength();
    }

    public override void InsertValue(int position, IComparable value) {
      dynamicValues.IncreaseLength();
    }

    public override void ChangeValue(int position, IComparable value) {
      throw new NotSupportedException("Can't change values of a programmable column");
    }

    public override void ChangeValueOrNull(int position, IComparable value) {
      throw new NotSupportedException("Can't change values of a programmable column");
    }

    public override void ChangeValueOrLeaveOldValue(int position, IComparable value) {
      throw new NotSupportedException("Can't change values of a programmable column");
    }

    public override ColumnBase CreateCopyOfColumnWithoutValues(int capacity) {
      return CreateCopyOfColumnWithoutValues();
    }

    public override ColumnBase CreateCopyOfColumnWithoutValues() {
      ProgrammableColumn clone = new ProgrammableColumn(this.Name, this.columnGroup);
      clone.Expression = expression;
      return clone;
    }
  }
}