#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2012 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.Linq;
using System.Text;
using HeuristicLab.Problems.BinPacking.Interfaces;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Core;
using HeuristicLab.Common;
using HeuristicLab.Problems.BinPacking.Shapes;
using HeuristicLab.Problems.BinPacking.PackingItem;
using HeuristicLab.Problems.BinPacking.PackingBin;

namespace HeuristicLab.Problems.BinPacking.Dimensions {
  [Item("Occupated Points 2D", "A datastructure holding all currently occupied points of a 2D packing-bin.")]
  [StorableClass]
  public class OccupiedPoints2D : OccupiedPoints<TwoDimensionalPacking, RectangularPackingBin, RectangularPackingItem> {
                   
    [Storable]
    private int[,] occupiedPoints { get; set; }

    public OccupiedPoints2D(RectangularPackingBin binMeasures) : base(binMeasures) {
      occupiedPoints = new int[binMeasures.Width, binMeasures.Height];
      for (int w = 0; w < binMeasures.Width; w++) {
        for (int h = 0; h < binMeasures.Height; h++) {
          occupiedPoints[w, h] = -1;
        }
      }
    }
    [StorableConstructor]
    protected OccupiedPoints2D(bool deserializing) : base(deserializing) { }
    protected OccupiedPoints2D(OccupiedPoints2D original, Cloner cloner)
      : base(original, cloner) {
      this.occupiedPoints = (int[,])original.occupiedPoints.Clone();
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new OccupiedPoints2D(this, cloner);
    }

    public override bool IsPositionFeasible(RectangularPackingItem measures, TwoDimensionalPacking position) {
      for (int w = position.X; w < position.X + measures.Width; w++) {
        for (int h = position.Y; h < position.Y + measures.Height; h++) {
          if (occupiedPoints[w, h] != -1)
            return false;
        }
      }
      return true;
    }
    public override void OccupyPoints(RectangularPackingItem measures, TwoDimensionalPacking position, int itemID) {
      int width = position.Rotated ? measures.Height : measures.Width;
      int height = position.Rotated ? measures.Width : measures.Height;
      for (int w = position.X; w < position.X + width; w++) {
        for (int h = position.Y; h < position.Y + height; h++) {
          occupiedPoints[w, h] = itemID;
        }
      }
    }
    public override bool IsPointOccupied(TwoDimensionalPacking point) {
      return occupiedPoints[point.X, point.Y] != -1;
    }
    public override int ShortestPossibleSideFromEP(TwoDimensionalPacking ep) {
      int shortestSide = int.MaxValue;
      int width = occupiedPoints.GetLength(0);
      int height = occupiedPoints.GetLength(1);

      if (ep.X >= width || ep.Y >= height)
        return shortestSide;

      int currentX = ep.X;
      while (currentX < width && occupiedPoints[currentX, ep.Y] == -1) { currentX++; }
      if (currentX - ep.X < shortestSide)
        shortestSide = currentX - ep.X;

      int currentY = ep.Y;
      while (currentY < height && occupiedPoints[ep.X, currentY] == -1) { currentY++; }
      if (currentY - ep.Y < shortestSide)
        shortestSide = currentY - ep.Y;

      return shortestSide;
    }
    public override bool IsStaticStable(RectangularPackingItem item, TwoDimensionalPacking ep) {
      //For the current implementation there was no need for stacking-constraints in the 2D-case. 
      //But it could be interesting for shelf-packing applications!
      throw new NotImplementedException();
    }
    public override bool WeightIsSupported(RectangularPackingItem item, TwoDimensionalPacking ep, ItemList<RectangularPackingItem> items) {
      return true;
    }
    public override void ChangeBinMeasures(RectangularPackingBin binMeasures) {
      throw new NotImplementedException();
    }
  }
}