using UnityEngine;
using UnityEngine.EventSystems;

namespace UVC.Edit
{
    public class InteractionController : MonoBehaviour
    {
        public static event System.Action<EditableObject> OnObjectSelected;
        public static event System.Action OnBackgroundClicked;

        private Camera _mainCamera;
        private EditableObject _selectedObject;

        void Awake()
        {
            _mainCamera = Camera.main;
        }

        void Update()
        {
            if (Input.GetMouseButtonDown(0))
            {
                // UI 위에서 클릭했는지 먼저 확인
                if (EventSystem.current.IsPointerOverGameObject())
                {
                    return; // UI 클릭 시 월드 객체 선택 방지
                }

                HandleSelection();
            }
        }

        private void HandleSelection()
        {
            Ray ray = _mainCamera.ScreenPointToRay(Input.mousePosition);
            // 3D 객체 선택 (Physics Raycast)
            if (Physics.Raycast(ray, out RaycastHit hit))
            {
                // EditableObject 컴포넌트를 가진 객체인지 확인
                if (hit.collider.TryGetComponent<EditableObject>(out var target))
                {
                    SetSelectedObject(target);
                    return;
                }
            }

            // 2D 객체 선택 (Physics2D Raycast) - 필요 시 카메라 설정에 따라 추가
            // RaycastHit2D hit2D = Physics2D.GetRayIntersection(ray);
            // if (hit2D.collider != null && hit2D.collider.TryGetComponent<EditableObject>(out var target2D))
            // {
            //     SetSelectedObject(target2D);
            //     return;
            // }

            // 아무것도 선택되지 않았을 경우
            SetSelectedObject(null);
        }

        private void SetSelectedObject(EditableObject target)
        {
            if (_selectedObject == target) return;

            _selectedObject?.OnDeselect();
            _selectedObject = target;
            _selectedObject?.OnSelect();

            if (_selectedObject != null)
            {
                OnObjectSelected?.Invoke(_selectedObject);
            }
            else
            {
                OnBackgroundClicked?.Invoke();
            }
        }
    }
}