#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2015 Joseph Helm and 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 HeuristicLab.Problems.BinPacking.Interfaces;
using HeuristicLab.Core;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Common;
using HeuristicLab.Problems.BinPacking.Dimensions;

namespace HeuristicLab.Problems.BinPacking.Shapes {
  [Item("RectangularPackingShape", "Represents the rectangular measures (width, height) of a two-dimensional bin-packing object.")]
  [StorableClass]
  public abstract class RectangularPackingShape : PackingShape<TwoDimensionalPacking>, IRegularPackingShape, IComparable<RectangularPackingShape> {
    #region Properties
    /// <summary>
    /// Describes the size on the Y-axis
    /// </summary> 
    [Storable]
    public int Height { get; set; }
    /// <summary>
    /// Describes the size on the X-axis
    /// </summary>  
    [Storable]
    public int Width { get; set; }
    #endregion

    #region Helpers
    public override TwoDimensionalPacking Origin { get { return new TwoDimensionalPacking(0, 0, 0); } }
    public override int MultipliedMeasures { get { return Height * Width; } }

    public override bool EnclosesPoint(TwoDimensionalPacking myPosition, TwoDimensionalPacking checkedPoint) {
      return (myPosition.X <= checkedPoint.X &&
                (myPosition.X + (myPosition.Rotated ? Height : Width) - 1) >= checkedPoint.X &&
                myPosition.Y <= checkedPoint.Y &&
                (myPosition.Y + (myPosition.Rotated ? Width : Height) - 1) >= checkedPoint.Y);
    }
    public override bool Encloses(TwoDimensionalPacking checkedPosition, PackingShape<TwoDimensionalPacking> checkedShape) {
      return Encloses(checkedPosition, (RectangularPackingShape)checkedShape);
    }
    private bool Encloses(TwoDimensionalPacking checkedPosition, RectangularPackingShape checkedShape) {
      return Encloses(new RectangleDiagonal(this), new RectangleDiagonal(checkedPosition, checkedShape));
    }       
    private bool Encloses(RectangleDiagonal r1, RectangleDiagonal r2) {
      return  ( r1.x1 <= r2.x1 &&
                r1.x2 >= r2.x2 &&
                r1.y1 <= r2.y1 &&
                r1.y2 >= r2.y2);
    }

    public override bool Overlaps(TwoDimensionalPacking myPosition, TwoDimensionalPacking checkedPosition, PackingShape<TwoDimensionalPacking> checkedShape) {
      return Overlaps(myPosition, checkedPosition, (RectangularPackingShape)checkedShape);
    }
    private bool Overlaps(TwoDimensionalPacking myPosition, TwoDimensionalPacking checkedPosition, RectangularPackingShape checkedShape) {    
      return Overlaps(new RectangleDiagonal (myPosition, this),new RectangleDiagonal (checkedPosition, checkedShape));
    }
    private bool Overlaps(RectangleDiagonal r1, RectangleDiagonal r2) {
      return !(r1.x1 > r2.x2 ||
               r1.y1 > r2.y2 ||
               r1.x2 < r2.x1 ||
               r1.y2 < r2.y1);
    }

    public void ApplyHorizontalOrientation() {
      if (Width < Height) {
        var aux = Width;
        Width = Height;
        Height = aux;
      }
    }
    #endregion

    public RectangularPackingShape(int width, int height) : base () {
      this.Height = height;
      this.Width = width;
    }

    public override void InitializeFromMeasures(int[] measures) {
      if (measures.Length != 2)
        throw new InvalidOperationException("Nr of measures does not fit shape-dimension.");
      this.Width = measures[0];
      this.Height = measures[1];
    }
    public override int[] ToArray() {
      return new int[] { Width, Height };
    }

    [StorableConstructor]
    protected RectangularPackingShape(bool deserializing) : base(deserializing) { }
    protected RectangularPackingShape(RectangularPackingShape original, Cloner cloner)
      : base(original, cloner) {
      this.Width = original.Width;
      this.Height = original.Height;
    }
    public RectangularPackingShape() : base() {}

    public override string ToString() {
      return String.Format("RectangularPackingShape ({0}, {1})", this.Width, this.Height);
    }

    #region IComparable<RectangularPackingShape> Members

    public int CompareTo(RectangularPackingShape other) {
      int result = 0;// this.MultipliedMeasures.CompareTo(other.MultipliedMeasures);
      if (result == 0) {
        result = this.Width.CompareTo(other.Width);
        if (result == 0) 
          result = this.Height.CompareTo(other.Height);
      }
      return result;
    }

    public int CompareTo(object obj) {
      if (obj.GetType().Equals(this.GetType()))
        return this.CompareTo((RectangularPackingShape)obj);
      else return 0;
    }

    #endregion

    private struct RectangleDiagonal {
      public int x1;
      public int y1;
      public int x2;
      public int y2;
      public RectangleDiagonal(RectangularPackingShape myShape) : this(new TwoDimensionalPacking(0, 0, 0), myShape) { }
      public RectangleDiagonal(TwoDimensionalPacking myPosition, RectangularPackingShape myShape) {
        x1 = myPosition.X;
        y1 = myPosition.Y;
        x2 = myPosition.X + (myPosition.Rotated ? myShape.Height : myShape.Width) - 1;
        y2 = myPosition.Y + (myPosition.Rotated ? myShape.Width : myShape.Height) - 1;
      }
    }
  }
}