using System;
using System.Linq.Expressions;
using System.Reflection;

namespace Artemis.Core
{
    internal static class ReflectionUtilities
    {
        public static PropertyInfo GetPropertyInfo<TSource, TProperty>(TSource source, Expression<Func<TSource, TProperty>> propertyLambda)
        {
            var type = typeof(TSource);

            var member = propertyLambda.Body as MemberExpression;
            if (member == null)
                throw new ArgumentException(string.Format("Expression '{0}' refers to a method, not a property.", propertyLambda));

            var propInfo = member.Member as PropertyInfo;
            if (propInfo == null)
                throw new ArgumentException(string.Format("Expression '{0}' refers to a field, not a property.", propertyLambda));

            return propInfo;
        }
    }
}