using Deltares.Dam.Data;

namespace Deltares.Standard.Specifications
{
    public class NotSpecification<TCandidate> : CompositeSpecification<TCandidate>
    {
        private readonly ISpecification<TCandidate> specification;

        public NotSpecification(ISpecification<TCandidate> specification)
        {
            this.specification = specification;
        }

        /// <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 satisfied = !(this.specification.IsSatisfiedBy(candidate));
            if (!satisfied)
            {
                base.Description = this.specification.Description;
            }
            return satisfied;
        }
    }
}