DDD.ValueType

using Ddd.Taxi.Domain;
using System.Reflection;
using System.Text;
using System.Collections.Generic;
using System.Linq;

namespace Ddd.Infrastructure
{
    public class ValueType<T>
    {
        private readonly List<PropertyInfo> propertyInfos;

        public ValueType()
        {
            propertyInfos = GetType()
                .GetProperties(BindingFlags.Instance | BindingFlags.Public)
                .OrderBy(property => property.Name)
                .ToList();
        }

        public override int GetHashCode()
        {
            unchecked
            {
                int hash = 0;
                foreach (var property in propertyInfos)
                {
                    var propertyValue = property.GetValue(this, null);
                    var propertyHash = propertyValue != null ? propertyValue.GetHashCode() : 0;
                    hash = (hash * 1244324135) ^ propertyHash;
                }
                return hash;
            }
        }

        public override bool Equals(object obj)
        {
            if (obj is null)
                return false;

            if (obj is not ValueType<T> otherValue)
                return false;



            foreach (var property in propertyInfos)
            {
                if (property.GetValue(this) == null && property.GetValue(otherValue) == null)
                    continue;

                if (!(property.GetValue(this) == null || property.GetValue(otherValue) == null || !property.GetValue(this)
                                                                                                        .Equals(property.GetValue(otherValue))))
                    continue;
                return false;
            }
            return true;
        }

        public bool Equals(PersonName name) => Equals((object)name);

        public override string ToString()
        {
            var result = new StringBuilder(GetType().Name + "(");
            for (int index = 0; index < propertyInfos.Count; index++)
            {
                var property = propertyInfos[index];
                var propertyValue = property.GetValue(this, null);
                result.AppendFormat("{0}: {1}{2}", property.Name, propertyValue, index != propertyInfos.Count - 1 ? "; " : ")");
            }
            return result.ToString();
        }
    }
}