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

namespace Gameplay.Player
{
    public class PlayerInteractorController : MonoBehaviour
    {
        [SerializeField] private float interactRange = 15f;
        [SerializeField] private LayerMask interactableLayer;
        [SerializeField] private Camera playerCamera;
        [SerializeField] private bool isDrawGizmos;

        private IInteractable currentTarget; // 被射线命中的当前可交互对象（用于按键交互）
        private IInteractable previousGazedTarget; // 上一次注视的对象（用于注视进入/离开事件）

        void Start()
        {
            if (playerCamera == null)
                playerCamera = GameObject.FindWithTag("MainCamera").GetComponent<Camera>();
            
            var input = InputManager.Instance.Input;
            input.Player.SwitchWatchMode.performed += ctx => currentTarget.Interact(this.gameObject);;
        }

        void Update()
        {
            DetectInteractable();
        }

        void DetectInteractable()
        {
            if (playerCamera == null) return;

            Ray ray = new Ray(playerCamera.transform.position, playerCamera.transform.forward);
            if (Physics.Raycast(ray, out RaycastHit hit, interactRange, interactableLayer))
            {
                IInteractable hitInteractable = hit.collider.GetComponent<IInteractable>();

                // 如果命中对象与之前注视的不一样，触发进入/离开事件
                if (hitInteractable != previousGazedTarget)
                {
                    if (previousGazedTarget != null)
                    {
                        previousGazedTarget.OnGazeExit(this.gameObject);
                    }

                    if (hitInteractable != null)
                    {
                        hitInteractable.OnGazeEnter(this.gameObject);
                        // 这里可以显示交互提示UI，例如 “E - 开门”
                        Debug.Log(hitInteractable.GetInteractPrompt());
                    }

                    previousGazedTarget = hitInteractable;
                }

                currentTarget = hitInteractable;
            }
            else
            {
                // 没有命中时，如果之前有注视对象，触发离开
                if (previousGazedTarget != null)
                {
                    previousGazedTarget.OnGazeExit(this.gameObject);
                    previousGazedTarget = null;
                }

                currentTarget = null;
            }
        }

        void OnDrawGizmos()
        {
            if (isDrawGizmos) return;
            if (playerCamera == null) return;
            Gizmos.color = Color.green;
            Vector3 origin = playerCamera.transform.position;
            Vector3 direction = playerCamera.transform.forward * interactRange;
            Gizmos.DrawLine(origin, origin + direction);
        }
    }
}