using BeWo.Data.Entities;
using BS.Shared;
using NHibernate.Criterion;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BeWo.Data.Access
{
	public class GenericSearchDAO : AbstractBaseDAO
	{
		internal GenericSearchDAO() { }

		public virtual T LoadEntityByProperty<T>(Func<T, object> propertyFunc, string propertyName = null) where T : BeWoEntityBase, new()
		{
			if (propertyName is null)
				propertyName = nameof(propertyFunc);

			var criteria = CreateCriteria<T>()
				.Add(Restrictions.Eq(propertyName, propertyFunc));

			var candidates = criteria.List<T>();

			if(candidates.Count == 1)
				return candidates[0];

			if (candidates.Count == 0)
				throw new NotImplementedException("Count == 0");

			throw new NotImplementedException("Count > 1");
		}
	}
}