using Microsoft.Azure.CosmosDB.Table;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;

namespace taloyhtio.idp.parser.common.domain
{
    public class Entity : TableEntity
    {
        int? _requestedHashCode;
        Guid _id;

        public Guid Id
        {
            get { return _id; }
            set
            {
                _id = value;
                RowKey = value.ToString();
            }
        }

        private List<INotification> _domainEvents;

        [JsonIgnore]
        public IReadOnlyCollection<INotification> DomainEvents => _domainEvents?.AsReadOnly();

        public void AddDomainEvent(INotification eventItem)
        {
            _domainEvents = _domainEvents ?? new List<INotification>();
            _domainEvents.Add(eventItem);
        }

        public void RemoveDomainEvent(INotification eventItem)
        {
            _domainEvents?.Remove(eventItem);
        }

        public void ClearDomainEvents()
        {
            _domainEvents?.Clear();
        }

        public bool IsTransient()
        {
            return Guid.Empty.Equals(Id);
        }

        public override bool Equals(object obj)
        {
            if (obj == null || !(obj is Entity))
                return false;

            if (ReferenceEquals(this, obj))
                return true;

            if (GetType() != obj.GetType())
                return false;

            Entity item = (Entity)obj;

            if (item.IsTransient() || IsTransient())
                return false;
            else
                return item.Id == Id;
        }

        public override int GetHashCode()
        {
            if (!IsTransient())
            {
                if (!_requestedHashCode.HasValue)
                    _requestedHashCode = Id.GetHashCode() ^ 31;

                return _requestedHashCode.Value;
            }
            else
                return base.GetHashCode();

        }
        public static bool operator ==(Entity left, Entity right)
        {
            if (Equals(left, null))
                return Equals(right, null);
            else
                return left.Equals(right);
        }

        public static bool operator != (Entity left, Entity right)
        {
            return !(left == right);
        }
    }
}