using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Reflection;

namespace CommonConsole
{
    public static class ReflectionExtensions
    {
        private static readonly ConcurrentDictionary<Type, IDictionary<Func<Object, Object[], Object>, Action<Object, Object, Object[]>>> metadata
            = new ConcurrentDictionary<Type, IDictionary<Func<object, object[], object>, Action<object, object, object[]>>>();
        
        public static void CopyTo<T>(this T source, T destination) where T : class
        {
            var type = typeof(T);
            var properties = metadata.GetOrAdd(type, AddTypeProperties);

            foreach (var kvp in properties)
            {
                var getter = kvp.Key;
                var setter = kvp.Value;
                var value = getter(source, null);

                setter(destination, value, null);
            }
        }

        private static IDictionary<Func<Object, Object[], Object>, Action<Object, Object, Object[]>> AddTypeProperties(Type type)
        {
            var properties = new Dictionary<Func<Object, Object[], Object>, Action<Object, Object, Object[]>>();

            foreach (var property in type.GetProperties(BindingFlags.Instance | BindingFlags.Public))
            {
                if (property.CanWrite)
                {
                    properties[property.GetValue] = property.SetValue;
                }
            }

            return properties;
        }
    }
}