using AutoMapper;

namespace DigitalData.Core.DTO
{
    public static class AutoMapperExtension
    {
        /// <summary>
        /// Maps a source object to a destination object, or throws an exception if the mapping result is null.
        /// </summary>
        /// <typeparam name="TSource">The source object type.</typeparam>
        /// <typeparam name="TDestination">The destination object type.</typeparam>
        /// <param name="source">The source object to map from.</param>
        /// <returns>The mapped destination object.</returns>
        /// <exception cref="MappingResultNullException">Thrown when the mapping result is null.</exception>
        public static TDestination MapOrThrow<TDestination>(this IMapper mapper, object source)
        {
            return mapper.Map<TDestination>(source) ?? throw new AutoMapperMappingException(
                $"Mapping to {typeof(TDestination).FullName} resulted in a null object. " +
                   "Hint: Ensure that the AutoMapper profile configuration for this mapping is correct.");
        }
    }
}