using Deltares.Dam.Data;

namespace Deltares.Standard.Specifications
{
    public class OrSpecification<TCandidate> : CompositeSpecification<TCandidate>
    {
        private readonly ISpecification<TCandidate> one;
        private readonly ISpecification<TCandidate> other;

        public OrSpecification(ISpecification<TCandidate> one, ISpecification<TCandidate> other)
        {
            this.one = one;
            this.other = other;
        }

        /// <summary>
        /// Determines whether the candidate satisfies the specification.
        /// </summary>
        /// <param name="candidate">The candidate to test.</param>
        /// <returns>
        ///   <c>true</c> if the candidate satisfies the specification otherwise, <c>false</c>.
        /// </returns>
        public override bool IsSatisfiedBy(TCandidate candidate)
        {
            bool otherIsSatisfiedBy = other.IsSatisfiedBy(candidate);
            bool thisIsSatisfiedBy = one.IsSatisfiedBy(candidate);

            bool isSatisfied = (thisIsSatisfiedBy || otherIsSatisfiedBy);
            if (!isSatisfied)
            {
                Description = "This " + one.Description + " AND " + other.Description + " are not satisfied";
            }
            return isSatisfied;
        }
    }
}