using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data.SqlTypes;
using System.Diagnostics.CodeAnalysis;
using System.Text;

namespace StgSharp
{
    public abstract class INode<T> where T : INode<T>
    {
        [NotNull]
        protected ContainerNode<T> _id;

        internal ContainerNode<T> ID 
        {
            get { return _id; } 
        }

        internal ContainerNode<T> Previous 
        {
            get { return _id._previous; }
            set { _id._previous = value; }
        }

        internal ContainerNode<T> Next
        {
            get { return _id._next; }
            set { _id._next = value; }
        }

        public INode()
        {
            _id = new ContainerNode<T>(this as T);
        }

        internal void SetId(ContainerNode<T> tContainer) 
        {
            _id = tContainer;
        }

        internal void SelfDestrcut()
        {
            _id._previous._next = _id._next;
            _id._next._previous = _id._previous;
            _id._next = null;
            _id._previous = null;
            GC.Collect();
        }

    }


    public class ContainerNode<T> : INullable where T : INode<T>
    {
        internal readonly T _value;

        [AllowNull]
        internal ContainerNode<T> _previous;
        [AllowNull]
        internal ContainerNode<T> _next;

        internal ContainerNode()
        {
        }


        public ContainerNode(T t)
        {
            _value = t;
            _previous = new ContainerNode<T>();
            _next = new ContainerNode<T>();
        }

        public virtual ContainerNode<T> Previous
        {
            get { return _previous; }
            set { _previous = value; }
        }

        public ContainerNode<T> Next
        {
            get { return _next; }
            set { _next = value; }
        }

        public T Value
        {
            get { return _value; }
        }

        public bool IsNull
        {
            get;
        }

        public void Remove()
        {
            _previous.Next = _next;
            _next.Previous = _previous;
            _next = default(ContainerNode<T>);
            _previous = default(ContainerNode<T>);
        }

    }
}