using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data.MoveVectorData;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using System;

namespace HeuristicLab.Encodings.MoveVectorEncoding.Crossovers
{
    [Item("SinglePointCrossover", "Single point crossover for move vectors.")]
    [StorableClass]
    public class SinglePointCrossover : MoveVectorCrossover
    {
        [StorableConstructor]
        protected SinglePointCrossover(bool deserializing) : base(deserializing) { }
        protected SinglePointCrossover(SinglePointCrossover original, Cloner cloner) : base(original, cloner) { }
        public SinglePointCrossover() : base() { }

        public override IDeepCloneable Clone(Cloner cloner)
        {
            return new SinglePointCrossover(this, cloner);
        }

        public static MoveVector Apply(IRandom random, MoveVector parent1, MoveVector parent2)
        {
            if (parent1.Length != parent2.Length)
                throw new ArgumentException("SinglePointCrossover: The parents are of different length.");

            int length = parent1.Length;
            MoveVector result = new MoveVector(length, parent1.MoveTypes);
            int breakPoint = random.Next(1, length);

            for (int i = 0; i < breakPoint; i++)
                result[i] = parent1[i];
            for (int i = breakPoint; i < length; i++)
                result[i] = parent2[i];

            return result;
        }

        protected override MoveVector Cross(IRandom random, ItemArray<MoveVector> parents)
        {
            if (parents.Length != 2) throw new ArgumentException("ERROR in SinglePointCrossover: The number of parents is not equal to 2");
            return Apply(random, parents[0], parents[1]);
        }
    }
}