using System;

namespace Deltares.Standard.Specifications
{
    /// <summary>
    /// Defines a greater then of equal to specification
    /// </summary>
    /// <typeparam name="TCandidate">The type of the candidate.</typeparam>
    /// <typeparam name="TValue">The type of the value.</typeparam>
    public class GreaterThanOrEqualToSpecification<TCandidate, TValue> : ValueBoundSpecification<TCandidate, TValue> where TValue : IComparable
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="GreaterThanOrEqualToSpecification&lt;TCandidate, TValue&gt;"/> class.
        /// </summary>
        /// <param name="attributeName">Name of the attribute.</param>
        /// <param name="attributeValue">The attribute value.</param>
        public GreaterThanOrEqualToSpecification(string attributeName, TValue attributeValue)
            : base(attributeName, attributeValue)
        {
        }

        /// <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)
        {
            var actual = this.GetCandidateTValue(candidate) as IComparable;
            return (actual.CompareTo(this.AttributeValue) >= 0);
        }
    }
}