#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 HEAL.Attic;

namespace HeuristicLab.DataImporter.Data.Model {
  [StorableType("7C0A4BD8-45A1-4710-AC42-1BCBB4DF03D5")]
  public class DateTimeColumn : ColumnBase {
    [Storable]
    private List<DateTime?> values;

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

    public DateTimeColumn(string columnName)
      : base(columnName) {
      this.values = new List<DateTime?>();
    }

    public DateTimeColumn(string columnName, int capacity)
      : this(columnName) {
      this.values.Capacity = capacity;
    }

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

    public override string ToString() {
      return base.ToString() + " <Date>";
    }

    protected override System.Collections.IList Values {
      get { return this.values; }
    }

    public override void AddValue(IComparable value) {
      this.values.Add((DateTime?)value);
    }

    public override void AddValueOrNull(IComparable value) {
      this.values.Add(ConvertToDateTime(value));
    }

    public override void ChangeValue(int position, IComparable value) {
      this.values[position] = (DateTime?)value;
    }

    public override void ChangeValueOrNull(int position, IComparable value) {
      this.values[position] = ConvertToDateTime(value);
    }

    public override void ChangeValueOrLeaveOldValue(int position, IComparable value) {
      if (value == null)
        this.values[position] = null;
      else {
        DateTime? val = ConvertToDateTime(value);
        if (val != null)
          this.values[position] = val;
      }
    }

    public override void InsertValue(int position, IComparable value) {
      this.values.Insert(position, (DateTime?)value);
    }

    private DateTime? ConvertToDateTime(IComparable value) {
      DateTime val;

      if (value == null)
        return null;

      if (DateTime.TryParse(value.ToString(), out val))
        return val;

      if (DateTime.TryParseExact(value.ToString(), "yyyyMMddHHmmss", CultureInfo.InvariantCulture, DateTimeStyles.None, out val))
        return val;

      return null;
    }

    public override ColumnBase CreateCopyOfColumnWithoutValues() {
      return CreateCopyOfColumnWithoutValues(this.values.Capacity);
    }

    public override ColumnBase CreateCopyOfColumnWithoutValues(int capacity) {
      return new DateTimeColumn(this.Name, capacity);
    }
  }
}