using System;

namespace DanieleMarotta.RiversongCodeShowcase
{
    public class SignalBus : ISignalBus, IDisposable
    {
        private readonly ListMultiDictionary<Type, Delegate> _subscribers = new();

        public void Dispose()
        {
            _subscribers.Clear();
        }

        public void Raise<T>(T signal)
        {
            if (!_subscribers.TryGetValues(typeof(T), out var handlers)) return;

            foreach (var handler in handlers) ((Action<T>)handler).Invoke(signal);
        }

        public void Subscribe<T>(Action<T> handler)
        {
            _subscribers.Add(typeof(T), handler);
        }

        public void Unsubscribe<T>(Action<T> handler)
        {
            _subscribers.Remove(typeof(T), handler);
        }
    }
}