using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.SceneManagement;
using PathologicalGames;

namespace SpartanFist
{
	/// <summary>
	/// Follows the target transform forever, and despawns if/when the target goes away
	/// </summary>
	public class FollowingAutoDespawner : AutoDespawner
	{
		protected Transform followTransform = null;
		protected bool isFollowing = false;

		public void SetFollowing(Transform followThis)
		{
			followTransform = followThis;
			isFollowing = (followTransform != null) ? true : false;
		}

		protected override void OnSpawned(SpawnPool ourSpawnPool)
		{
			followTransform = null;
			isFollowing = false;

			base.OnSpawned(ourSpawnPool);
		}

		protected override void Update()
		{
			if (followTransform != null)
			{
				this.gameObject.transform.position = followTransform.position;
				this.gameObject.transform.rotation = followTransform.rotation;
			}

			base.Update();
		}

		protected override bool ShouldDespawn(float deltaTime)
		{
			// If we're following something, and that something goes inactive or self-destructs, despawn us
			if ((followTransform != null) && (!followTransform.gameObject.activeInHierarchy)) { return true; }
			else if ((followTransform == null) && isFollowing) { return true; }

			return base.ShouldDespawn(deltaTime);
		}
	}
}