using Core.Utilities;
using UnityEngine;
using UnityEngine.Events;
using TowerDefense.Level;

namespace TowerDefense.Towers
{
    /// <summary>
    /// A helper component for self destruction
    /// </summary>
    public class SelfDestroyTimer : MonoBehaviour
    {
        /// <summary>
        /// The time before destruction
        /// </summary>
        public float time = 5;

        /// <summary>
        /// The controlling timer
        /// </summary>
        public Timer timer;

        /// <summary>
        /// The exposed death callback
        /// </summary>
        public UnityEvent death;

        /// <summary>
        /// 防止子弹飞到怪物出生点后面
        /// </summary>
        private float farthestZ;

        private void Start()
        {
            farthestZ = EndlessLevelManager.instance.StartingNodeList[0].transform.position.z + 3f;
        }

        /// <summary>
        /// Potentially initialize the time if necessary
        /// </summary>
        protected virtual void OnEnable()
        {
            if (timer == null)
            {
                timer = new Timer(time, OnTimeEnd);
            }
            else
            {
                timer.Reset();
            }
        }

        /// <summary>
        /// Update the timer
        /// </summary>
        protected virtual void Update()
        {
            if (timer == null)
            {
                return;
            }
            timer.Tick(Time.deltaTime);

            if (gameObject.transform.position.z >= farthestZ)
                OnTimeEnd();
        }

        /// <summary>
        /// Fires at the end of timer
        /// </summary>
        protected virtual void OnTimeEnd()
        {
            death.Invoke();
            Poolable.TryPool(gameObject);
            timer.Reset();
        }
    }
}