using System.Collections.Generic;

namespace PrototypePattern.framework
{
    public interface ICopyable
    {
        ICopyable createClone();
    }

    public class CloneManager
    {
        private static volatile CloneManager uniqueInstance = null;

        protected CloneManager()
        {
        }

        public static CloneManager Instance
        {
            get
            {
                if (uniqueInstance == null)
                {
                    lock (typeof(CloneManager))
                    {
                        if (uniqueInstance == null)
                            uniqueInstance = new CloneManager();
                    }
                }

                return uniqueInstance;
            }
        }




        private Dictionary<PrototypeID, ICopyable> showcase = new Dictionary<PrototypeID, ICopyable>();

        /// <summary>
        /// 등록
        /// </summary>
        /// <param name="id"></param>
        /// <param name="prototype"></param>
        public void Register(PrototypeID id, ICopyable prototype)
        {
            showcase.Add(id, prototype); //새 객체 Add
        }

        /// <summary>
        /// 생성 및 가져오기
        /// </summary>
        /// <param name="prototypeID"></param>
        /// <returns></returns>
        public ICopyable Create(PrototypeID prototypeID)
        {
            return (ICopyable)showcase[prototypeID];
        }

        /// <summary>
        /// 삭제
        /// </summary>
        /// <param name="prototypeID"></param>
        public void Remove(PrototypeID prototypeID)
        {
            showcase.Remove(prototypeID);
        }

        /// <summary>
        /// 재생성
        /// </summary>
        /// <param name="prototypeID"></param>
        /// <returns></returns>
        public ICopyable Recreate(PrototypeID prototypeID)
        {
            Remove(prototypeID);
            return Create(prototypeID);
        }

        /// <summary>
        /// 덮어쓰기
        /// </summary>
        /// <param name="prototypeID"></param>
        /// <param name="prototype"></param>
        public void OverWrite(PrototypeID prototypeID, ICopyable prototype)
        {
            Remove(prototypeID);
            Register(prototypeID, prototype);
        }
    }

    public enum PrototypeID
    {
        Original,
        Copy,
        Edit
    }
}