using Microsoft.Azure.CosmosDB.Table;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace webapi.Domain.SeedWork
{
    public abstract class Entity: TableEntity
    {
        int? _requestedHashCode;
        Guid _id;
        //public virtual int Id
        //{
        //    get
        //    {
        //        return _Id;
        //    }
        //    protected set
        //    {
        //        _Id = value;
        //    }
        //}

        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(this.Id);
        }

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

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

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

            Entity item = (Entity)obj;

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

        public override int GetHashCode()
        {
            if (!IsTransient())
            {
                if (!_requestedHashCode.HasValue)
                    _requestedHashCode = this.Id.GetHashCode() ^ 31; // XOR for random distribution (http://blogs.msdn.com/b/ericlippert/archive/2011/02/28/guidelines-and-rules-for-gethashcode.aspx)

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

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

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