using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Reflection;
using ConsoleApplication1;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Persistable c = new PersistableObjects.Customer(1, "C");
            Persistable e = new PersistableObjects.Employee();
            Persistence.PrintPersistedObjects();
            Console.ReadLine();
        }
    }

    interface Persistable
    {
        object GetID();
    }

    static class Persistence
    {
        public static Type[] persistableEntities = AppDomain.CurrentDomain.GetAssemblies()
                       .SelectMany(t => t.GetTypes())
                       .Where(t => t.IsClass && t.Namespace == "PersistableObjects").ToArray();

        static Dictionary<Type, Dictionary<object, Persistable>> topkek = new Dictionary<Type,Dictionary<object, Persistable>>();

        static Persistence()
        {
            foreach (Type t in persistableEntities)
            {
                topkek.Add(t, new Dictionary<object, Persistable>());
            }
        }

        public static void Persist(this Persistable persistable)
        {
            topkek[persistable.GetType()].Add(persistable.GetID(), persistable);
        }

        public static void PrintPersistedObjects()
        {
            foreach (var v in topkek.Values)
            {
                foreach (Persistable p in v.Values)
                {
                    //Console.WriteLine(p.GetType());
                    if (persistableEntities.Contains(p.GetType()))
                    {
                        foreach (FieldInfo f in p.GetType().GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public))
                        {
                            object fieldValue;

                            if (persistableEntities.Contains(f.FieldType))
                            {
                                fieldValue = ((Persistable)f.GetValue(p)).GetID();
                                Console.WriteLine(fieldValue);
                            }
                            else
                            {
                                fieldValue = f.GetValue(p);
                                Console.WriteLine(fieldValue);
                            }
                        }
                    }
                }
            }
        }
    }
}

namespace PersistableObjects
{
    class Customer : Persistable
    {
        private int id;
        private string name;

        public Customer(int id, string name)
        {
            this.id = id;
            this.name = name;
            this.Persist();
        }

        public object GetID()
        {
            return id;
        }
    }

    class Employee : Persistable
    {
        private int id = 2;
        private string name = "E";
        private Customer c;

        public Employee()
        {
            c = new Customer(3, "FU");
            this.Persist();
        }

        public object GetID()
        {
            return id;
        }
    }
}