using System;
using System.Diagnostics;

namespace Zenject
{
    [DebuggerStepThrough]
    public struct SignalSubscriptionId : IEquatable<SignalSubscriptionId>
    {
        BindingId _signalId;
        object _callback;

        public SignalSubscriptionId(BindingId signalId, object callback)
        {
            _signalId = signalId;
            _callback = callback;
        }

        public BindingId SignalId
        {
            get { return _signalId; }
        }

        public object Callback
        {
            get { return _callback; }
        }

        public override int GetHashCode()
        {
            unchecked // Overflow is fine, just wrap
            {
                int hash = 17;
                hash = hash * 29 + _signalId.GetHashCode();
                hash = hash * 29 + _callback.GetHashCode();
                return hash;
            }
        }

        public override bool Equals(object that)
        {
            if (that is SignalSubscriptionId)
            {
                return Equals((SignalSubscriptionId)that);
            }

            return false;
        }

        public bool Equals(SignalSubscriptionId that)
        {
            return Equals(_signalId, that._signalId)
                && Equals(Callback, that.Callback);
        }

        public static bool operator == (SignalSubscriptionId left, SignalSubscriptionId right)
        {
            return left.Equals(right);
        }

        public static bool operator != (SignalSubscriptionId left, SignalSubscriptionId right)
        {
            return !left.Equals(right);
        }
    }
}
