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using System;

using Hammock.Extensions;

using Hammock.Specifications;

using Hammock.Validation;

namespace Hammock.Attributes.Validation

{

#if !SILVERLIGHT

    [Serializable]

#endif

    public class SpecificationAttribute : ValidationAttribute

    {

        public SpecificationAttribute(Type specificationType)

        {

            if (!specificationType.Implements(typeof (ISpecification)))

            {

                throw new ValidationException("You must provide a valid specification type.");

            }

            SpecificationType = specificationType as ISpecification;

        }

        public ISpecification SpecificationType { get; private set; }

        public override string TransformValue(System.Reflection.PropertyInfo property, object value)

        {

            if(SpecificationType != null && !value.Satisfies(SpecificationType))

            {

                var message =

                    "The value for '{0}' does not satisfy {1}."

                        .FormatWith(property.Name, SpecificationType);

                throw new ValidationException(message);

            }

            return base.TransformValue(property, value);

        }

    }

}