#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;

namespace HeuristicLab.DataImporter.Data {
  [Flags]
  public enum ColumnGroupState {
    None = 0,
    Active = 1,
    ColumnSelected = 2 | Active,
    DoubleColumnSelected = 4 | ColumnSelected,
    DateTimeColumnSelected = 8 | ColumnSelected,
    StringColumnSelected = 16 | ColumnSelected,
    ProgrammableColumnSelected = 32 | ColumnSelected,
    AnySelectedColumnContainsNull = 64 | ColumnSelected,
    Sorted = 128 | Active,
    AnySelectedColumnNotSorted = 256 | Sorted | ColumnSelected
  }

  public class DataSetState {
    public DataSetState(int activeColumnGroups, ColumnGroupState state)
      : this(activeColumnGroups, -1, state) {
    }

    public DataSetState(int activeColumnGroups, int selectedColumns, ColumnGroupState state) {
      this.selectedColumns = selectedColumns;
      this.activeColumnGroups = activeColumnGroups;
      this.state = state;
    }

    private int activeColumnGroups;
    public int ActiveColumnGroups {
      get { return this.activeColumnGroups; }
    }

    private int minActiveColumnGroups = int.MaxValue;
    public int MinActiveColumnGroups {
      get { return minActiveColumnGroups; }
      set { minActiveColumnGroups = value; }
    }

    //only meaningful if activeColumnGroups == 1
    private int selectedColumns;
    public int SelectedColumns {
      get { return activeColumnGroups == 1 ? this.selectedColumns : -1; } //throw Exception instead of return -1
      set { this.selectedColumns = value; }
    }

    private ColumnGroupState state;
    public ColumnGroupState State {
      get { return this.state; }
    }

    public void AddColumnGroupState(ColumnGroupState state) {
      if (state == ColumnGroupState.None)
        return;
      activeColumnGroups++;
      if (this.state == ColumnGroupState.None)
        this.state = state;
      else
        this.state &= state;
    }

    public bool Enabled(DataSetState other) {
      if (this.activeColumnGroups == 0)
        return true;
      else if (other.activeColumnGroups != this.activeColumnGroups)
        if (other.activeColumnGroups >= minActiveColumnGroups) return true;
        else return false;
      else if (SelectedColumns != -1 && other.SelectedColumns != SelectedColumns)
        return false;
      return (this.state & other.state) == this.state;
    }

    public override bool Equals(object obj) {
      if (obj == this)
        return true;
      else if(obj is DataSetState) {
        DataSetState other = (DataSetState)obj;
        return
          other.activeColumnGroups == this.activeColumnGroups &&
          other.state == this.state &&
          this.selectedColumns == other.selectedColumns;
      }
      return false;
    }

    public override int GetHashCode() {
      return this.activeColumnGroups.GetHashCode() ^ this.state.GetHashCode() ^ this.selectedColumns.GetHashCode();
    }

  }
}