using System;
using UnityEngine;

namespace AibisDream.FixSystem
{
    [RequireComponent(typeof(Collider2D))]
    public class BottleSlot : MonoBehaviour
    {
        public event Action<CoolingBottle> InsertSlotEvent;
        public event Action RemoveSlotEvent;
        public CoolingBottleData initBottleData;

        private CoolingBottle _curBottle;
        private GameObject _bottlePrefab;
        private bool _inShelf;

        private void Start()
        {
            InitRefs();
            InitBottle();
        }

        private void InitRefs()
        {
            var shelf = GetComponentInParent<BottleShelf>();
            // 根据在瓶架上还是机器中确定操作
            _inShelf = shelf != null;

            _bottlePrefab = Resources.Load<GameObject>("Prefabs/Fix/Bottle");
        }
        
        private void InitBottle()
        {
            if (string.IsNullOrEmpty(initBottleData.name)) return;
            
            var newBottle = Instantiate(_bottlePrefab, transform).GetComponent<CoolingBottle>();
            _curBottle = newBottle;
            // 加载瓶子数据
            newBottle.Load(initBottleData);
            newBottle.curSnapSlot = this;
        }

        /// <summary>
        /// 与瓶子发生碰撞时
        /// </summary>
        /// <param name="other"></param>
        private void OnTriggerEnter2D(Collider2D other)
        {
            // 如果当前Slot里已经有瓶子了，就返回
            if (_curBottle != null) return;
            
            // 尝试获取瓶子
            if (other.gameObject.TryGetComponent<CoolingBottle>(out var bottle))
            {
                bottle.targetSnapSlotSet.Add(this);
            }
        }

        /// <summary>
        /// 瓶子离开时
        /// </summary>
        /// <param name="other"></param>
        private void OnTriggerExit2D(Collider2D other)
        {
            // 尝试获取瓶子
            if (other.gameObject.TryGetComponent<CoolingBottle>(out var bottle))
            {
                bottle.targetSnapSlotSet.Remove(this);
            }
        }

        /// <summary>
        /// 移除当前瓶子
        /// </summary>
        public void RemoveBottle()
        {
            _curBottle = null;
            RemoveSlotEvent?.Invoke();
        }

        /// <summary>
        /// 插入时触发
        /// </summary>
        /// <param name="coolingBottle"></param>
        public void InsertSlot(CoolingBottle coolingBottle)
        {
            _curBottle = coolingBottle;
            _curBottle.transform.parent = transform;
            // 在架子上才正过来
            if (_inShelf)
            {
                coolingBottle.Rotate(true);
            }
        }

        public void ChangeSlot(CoolingBottle coolingBottle)
        {
            InsertSlotEvent?.Invoke(coolingBottle);
        }

        /// <summary>
        /// 是否有冷却液
        /// </summary>
        /// <returns>瓶子</returns>
        public CoolingBottle GetCurBottle()
        {
            return _curBottle;
        }

        public void DestroyBottle()
        {
            if (_curBottle)
            {
                _curBottle.transform.parent = null;
                Destroy(_curBottle.gameObject);
                _curBottle = null;
            }
        }
    }
}