using UnityEngine;
using Script.Gameplay.Interface;
using System;
using Core;
using Script.Gameplay.Input;
using UnityEngine.InputSystem;

namespace Script.Gameplay.Player
{
    public class PlayerInteractorController : MonoBehaviour
    {
        [SerializeField] private FirstPersonRaycaster raycaster; // 新增：第一人称射线检测器
        [SerializeField] private bool isEnablePlayerInteraction = true; // 是否启用玩家交互功能

        private IInteractable previousTarget;
        private IInteractable currentTarget;
        private IInteractable CurrentTarget
        {
            get => currentTarget;
            set
            {
                previousTarget = currentTarget;
                currentTarget = value;
                if (previousTarget != currentTarget)
                {
                    if (currentTarget != null)
                    {
                        OnGazeEnter?.Invoke((currentTarget as MonoBehaviour)?.gameObject);
                    }
                    if (previousTarget != null)
                    {
                        OnGazeExit?.Invoke((previousTarget as MonoBehaviour)?.gameObject);
                    }
                }
            }
        } // 被射线命中的当前可交互对象（用于按键交互）
        public event Action<GameObject> OnGazeEnter;
        public event Action<GameObject> OnGazeExit;

        void Start()
        {
            if (raycaster == null)
                raycaster = GetComponent<FirstPersonRaycaster>() ?? GetComponentInChildren<FirstPersonRaycaster>();
            if (raycaster == null)
                raycaster = FindObjectOfType<FirstPersonRaycaster>();
            if (raycaster == null)
                Debug.LogWarning("FirstPersonRaycaster not found! Please assign or add it to the player.");
            
            var input = InputManager.Instance.Input;

            input.Player.Interact.performed += OnInteractOnperformed;
            
            ControllerLocator.Instance.Register(this);
        }

        private void OnInteractOnperformed(InputAction.CallbackContext ctx)
        {
            if (CurrentTarget == null) return;
            if (!CurrentTarget.IsEnableInteract) return;
            CurrentTarget.Interact(this.gameObject);
        }
        
        void Update()
        {
            DetectInteractable();
        }

        void DetectInteractable()
        {
            if (raycaster == null) return;
            if (!isEnablePlayerInteraction) return;

            GameObject lookAtObj = raycaster.CurrentLookAtObject;
            IInteractable hitInteractable = lookAtObj != null ? lookAtObj.GetComponent<IInteractable>() : null;

            CurrentTarget = hitInteractable;
        }
        
        public void SetPlayerInteractionEnabled(bool isEnabled)
        {
            isEnablePlayerInteraction = isEnabled;
            if (!isEnabled)
            {
                CurrentTarget = null;
            }
        }

        private void OnDestroy()
        {
            ControllerLocator.Instance.Unregister<PlayerInteractorController>(this);
                        
            var input = InputManager.Instance.Input;
            input.Player.Interact.performed -= OnInteractOnperformed;
        }

        void OnDrawGizmos()
        {
            // 交由 FirstPersonRaycaster 绘制射线
        }
    }
}