using System.Collections.Generic;
using UnityEngine;
#if UNITY_EDITOR
using TriInspector;
#endif

namespace R0bbie.Timeline.Events
{
    /// <summary>
    /// Scriptable Object to handle in game events without the need of direct references
    /// </summary>
    [CreateAssetMenu(fileName = "GameEvent", menuName = "Timeline/Game Event")]
    public class GameEvent : ScriptableObject
    {
        // Private Variables
        
        List<IGameEventListener> listeners = new List<IGameEventListener>();
        
        /// <summary>
        /// Call all listeners registered under this event
        /// </summary>
        public void Raise()
        {
            for (int i = listeners.Count -1; i >= 0; i--)
                listeners[i].OnEventRaised();
        }
        

        /// <summary>
        /// Register listener to be called when event raised
        /// </summary>
        /// <param name="listener"></param>
        public void RegisterListener(IGameEventListener listener)
        {
            // Check that the listener is not on the list before adding it to avoid duplicates
            if(!listeners.Contains(listener))
                listeners.Add(listener);
        }
        

        /// <summary>
        /// Unregister listener to not be called anymore
        /// </summary>
        /// <param name="listener"></param>
        public void UnregisterListener(IGameEventListener listener)
        {
            // Check that the listener is part of the list before trying to remove it
            if(listeners.Contains(listener))
                listeners.Remove(listener);
        }
        
        
#if UNITY_EDITOR
        [Button("Test Raise")]
        void Test()
        {
            Raise();
        }
#endif
        
    }
}