#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2014 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 HeuristicLab.Core;
using HeuristicLab.Tests;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace HeuristicLab.Encodings.PermutationEncoding.Tests {
  /// <summary>
  ///This is a test class for OrderCrossoverTest and is intended
  ///to contain all OrderCrossoverTest Unit Tests
  ///</summary>
  [TestClass()]
  public class OrderCrossoverTest {
    /// <summary>
    ///A test for Cross
    ///</summary>
    [TestMethod]
    [TestCategory("Encodings.Permutation")]
    [TestProperty("Time", "short")]
    public void OrderCrossoverCrossTest() {
      TestRandom random = new TestRandom();
      OrderCrossover_Accessor target =
        new OrderCrossover_Accessor(new PrivateObject(typeof(OrderCrossover)));
      // perform a test with more than two parents
      random.Reset();
      bool exceptionFired = false;
      try {
        target.Cross(random, new ItemArray<Permutation>(new Permutation[] { 
          new Permutation(PermutationTypes.RelativeUndirected, 4), new Permutation(PermutationTypes.RelativeUndirected, 4), new Permutation(PermutationTypes.RelativeUndirected, 4)}));
      } catch (System.InvalidOperationException) {
        exceptionFired = true;
      }
      Assert.IsTrue(exceptionFired);
    }

    /// <summary>
    ///A test for Apply
    ///</summary>
    [TestMethod]
    [TestCategory("Encodings.Permutation")]
    [TestProperty("Time", "short")]
    public void OrderCrossoverApplyTest() {
      TestRandom random = new TestRandom();
      Permutation parent1, parent2, expected, actual;
      // The following test is based on an example from Eiben, A.E. and Smith, J.E. 2003. Introduction to Evolutionary Computation. Natural Computing Series, Springer-Verlag Berlin Heidelberg, pp. 55-56
      random.Reset();
      random.IntNumbers = new int[] { 3, 6 };
      parent1 = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8 });
      Assert.IsTrue(parent1.Validate());
      parent2 = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 8, 2, 6, 7, 1, 5, 4, 0, 3 });
      Assert.IsTrue(parent2.Validate());
      expected = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 2, 7, 1, 3, 4, 5, 6, 0, 8 });
      Assert.IsTrue(expected.Validate());
      actual = OrderCrossover.Apply(random, parent1, parent2);
      Assert.IsTrue(actual.Validate());
      Assert.IsTrue(Auxiliary.PermutationIsEqualByPosition(expected, actual));
      // The following test is based on an example from Larranaga, P. et al. 1999. Genetic Algorithms for the Travelling Salesman Problem: A Review of Representations and Operators. Artificial Intelligence Review, 13, pp. 129-170.
      random.Reset();
      random.IntNumbers = new int[] { 2, 4 };
      parent1 = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 0, 1, 2, 3, 4, 5, 6, 7 });
      Assert.IsTrue(parent1.Validate());
      parent2 = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 1, 3, 5, 7, 6, 4, 2, 0 });
      Assert.IsTrue(parent2.Validate());
      expected = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 7, 6, 2, 3, 4, 0, 1, 5 });
      actual = OrderCrossover.Apply(random, parent1, parent2);
      Assert.IsTrue(actual.Validate());
      Assert.IsTrue(Auxiliary.PermutationIsEqualByPosition(expected, actual));
      // The following test is based on an example from Talbi, E.G. 2009. Metaheuristics - From Design to Implementation. Wiley, p. 218.
      random.Reset();
      random.IntNumbers = new int[] { 2, 5 };
      parent1 = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8 });
      Assert.IsTrue(parent1.Validate());
      parent2 = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 7, 3, 0, 4, 8, 2, 5, 1, 6 });
      Assert.IsTrue(parent2.Validate());
      expected = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 0, 8, 2, 3, 4, 5, 1, 6, 7 });
      Assert.IsTrue(expected.Validate());
      actual = OrderCrossover.Apply(random, parent1, parent2);
      Assert.IsTrue(actual.Validate());
      Assert.IsTrue(Auxiliary.PermutationIsEqualByPosition(expected, actual));
      // The following test is not based on published examples
      random.Reset();
      random.IntNumbers = new int[] { 0, 5 };
      parent1 = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 2, 1, 4, 3, 7, 8, 6, 0, 5, 9 });
      Assert.IsTrue(parent1.Validate());
      parent2 = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 5, 3, 4, 0, 9, 8, 2, 7, 1, 6 });
      Assert.IsTrue(parent2.Validate());
      expected = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 2, 1, 4, 3, 7, 8, 6, 5, 0, 9 });
      Assert.IsTrue(expected.Validate());
      actual = OrderCrossover.Apply(random, parent1, parent2);
      Assert.IsTrue(actual.Validate());
      Assert.IsTrue(Auxiliary.PermutationIsEqualByPosition(expected, actual));
      // based on the previous with changed breakpoints
      random.Reset();
      random.IntNumbers = new int[] { 6, 9 };
      expected = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 3, 4, 8, 2, 7, 1, 6, 0, 5, 9 });
      Assert.IsTrue(expected.Validate());
      actual = OrderCrossover.Apply(random, parent1, parent2);
      Assert.IsTrue(actual.Validate());
      Assert.IsTrue(Auxiliary.PermutationIsEqualByPosition(expected, actual));
      // another one based on the previous with changed breakpoints
      random.Reset();
      random.IntNumbers = new int[] { 0, 9 };
      expected = new Permutation(PermutationTypes.RelativeUndirected, new int[] { 2, 1, 4, 3, 7, 8, 6, 0, 5, 9 });
      Assert.IsTrue(expected.Validate());
      actual = OrderCrossover.Apply(random, parent1, parent2);
      Assert.IsTrue(actual.Validate());
      Assert.IsTrue(Auxiliary.PermutationIsEqualByPosition(expected, actual));

      // perform a test when the two permutations are of unequal length
      random.Reset();
      bool exceptionFired = false;
      try {
        OrderCrossover.Apply(random, new Permutation(PermutationTypes.RelativeUndirected, 8), new Permutation(PermutationTypes.RelativeUndirected, 6));
      } catch (System.ArgumentException) {
        exceptionFired = true;
      }
      Assert.IsTrue(exceptionFired);
    }
  }
}