using System.Collections.Generic;
using Kreta.Ellenorzo.Domain.VN.Interfaces;
using Kreta.Ellenorzo.Domain.VN.Logic;

namespace Kreta.Ellenorzo.Domain.VN.UniqueIdentifier
{
    public class TanevRendjeUid : IReadonlyUidRaw, IEqualityComparer<TanevRendjeUid>
    {
        public TanevRendjeUid(int id, int? osztalyCsoportId)
        {
            Id = id;
            OsztalyCsoportId = osztalyCsoportId;
            UidRaw = UidLogic.Concat(id, osztalyCsoportId);
        }

        public TanevRendjeUid(string uidRaw)
        {
            var compositeKeyElements = UidLogic.GetCompositeKeyElements(uidRaw);
            Id = int.Parse(compositeKeyElements[0]);
            OsztalyCsoportId = int.TryParse(compositeKeyElements[1], out var result) ? (int?)result : null;
            UidRaw = uidRaw;
        }

        public int Id { get; private set; }

        public int? OsztalyCsoportId { get; private set; }

        public string UidRaw { get; private set; }

        public bool Equals(TanevRendjeUid x, TanevRendjeUid y) => x == y || x.UidRaw == y.UidRaw;

        public int GetHashCode(TanevRendjeUid obj) => obj.UidRaw.GetHashCode();
    }
}