using System;
using Chernobyl.Destruction;
using UnityEngine;

namespace Chernobyl.Unity.Event
{
    /// <summary>
    /// Logs a message to the console when an event is received.
    /// </summary>
    public class EventConsoleLog : MonoBehaviour
    {
        /// <summary>
        /// The event that causes the logging.
        /// </summary>
        [Tooltip("The event that causes the logging.")]
        public EventSource EventSource;

        /// <summary>
        /// See Unity docs for more info.
        /// </summary>
        public void Start()
        {
            EventSource.ThrowIfNull(nameof(EventSource));
            _eventSubscription = EventSource.Observable.Subscribe(OnEventReceived);
        }

        /// <summary>
        /// See Unity docs for more info.
        /// </summary>
        public void OnDestroy() => _eventSubscription.Dispose();

        void OnEventReceived(object obj) => Debug.Log("Event received.", gameObject);

        IDisposable _eventSubscription = Disposable.Empty;
    }
}