using Deltares.Dam.Data;

namespace Deltares.Standard.Specifications
{
    /// <summary>
    /// The and specification is a compositable one. 
    /// </summary>
    /// <typeparam name="TCandidate">The type of the candidate.</typeparam>
    public class AndSpecification<TCandidate> : CompositeSpecification<TCandidate>
    {
        private readonly ISpecification<TCandidate> one;
        private readonly ISpecification<TCandidate> other;

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

        /// <summary>
        /// Determines whether this candidate satisfies the specification AND the other.
        /// </summary>
        /// <param name="candidate">The candidate.</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.one.IsSatisfiedBy(candidate) && this.other.IsSatisfiedBy(candidate));
            if (!satisfied)
            {
                base.Description = this.Description;
            }
            return satisfied;
        }
    }
}