using TriInspector;
using UnityEngine;
using UnityEngine.Events;
using R0bbie.Timeline.Events;

namespace R0bbie.Timeline
{
    /// <summary>
    /// Just watches for custom GameEvent being raised, then auto-completes
    /// </summary>
    [AddComponentMenu("Timeline/Commands/Watch for Event (Step Command)")]
    [RequireComponent(typeof(Step))]
    public class WatchForEventCmd : StepCmd, IGameEventListener
    {
        // Exposed Variables

        [Title("Event Reference")] 
        [SerializeField] GameEvent gameEventToWatchFor;
        
        bool registered;
        
        
        /// <summary>
        /// Initialise command (called before Activate)
        /// </summary>
        protected override void Init()
        {
            init = true;
        }

        
        public override void Activate(Step _parentStep)
        {
            base.Activate(_parentStep);

            // Start watching for GameEvent...
            if (!registered)
                Register();
        }
        
        
        void Register()
        {
            gameEventToWatchFor.RegisterListener(this);
            registered = true;
        }
        
        
        void Unregister()
        {
            gameEventToWatchFor.UnregisterListener(this);
            registered = false;
        }
        
        
        public void OnEventRaised()
        {
            Unregister();
            
            Complete();
        }
        

        protected override void Cleanup()
        {
            active = false;
        }
        
        
    }
}