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

namespace InABox.Core
{
    public class LinkedProperty
    {
        private LinkedProperty(PropertyInfo source, PropertyInfo target)
        {
            Source = source;
            Target = target;
        }

        public PropertyInfo Source { get; }
        public PropertyInfo Target { get; }

        public static LinkedProperty Create<TEntityLink, TLinkedEntity>(Expression<Func<TEntityLink, object>> source,
            Expression<Func<TLinkedEntity, object>> target)
        {
            return new LinkedProperty(
                CoreUtils.GetPropertyFromExpression(source),
                CoreUtils.GetPropertyFromExpression(target)
            );
        }

        public void Update(object from, object to)
        {
            if (from != null && to != null)
            {
                var value = Source.GetValue(from);
                Target.SetValue(to, value);
            }
        }
    }
}