using ActionRPG.Input;
using ActionRPG.Interfaces;
using UnityEngine;
using static ActionRPG.Interfaces.InteractionType;

namespace ActionRPG.Interaction
{
    /// <summary>
    /// Casts a ray from the player's camera each frame to detect IInteractable objects.
    /// Subscribes to PlayerInputReader to trigger interaction on the correct input.
    /// </summary>
    [RequireComponent(typeof(PlayerInputReader))]
    public class PlayerInteractor : MonoBehaviour
    {
        [Header("Raycast")]
        [SerializeField] private Camera _camera;
        [SerializeField, Min(0f)] private float _interactRange = 2.5f;
        [SerializeField] private LayerMask _interactableLayer;

        private PlayerInputReader _input;
        private IInteractable _currentTarget;

        private void Awake()
        {
            _input = GetComponent<PlayerInputReader>();

            if (_camera == null)
                _camera = Camera.main;
        }

        private void OnEnable()
        {
            _input.OnInteractStarted  += HandleInteractPress;
            _input.OnInteractPerformed += HandleInteractHold;
        }

        private void OnDisable()
        {
            _input.OnInteractStarted  -= HandleInteractPress;
            _input.OnInteractPerformed -= HandleInteractHold;
            ClearTarget();
        }

        private void Update()
        {
            Ray ray = new Ray(_camera.transform.position, _camera.transform.forward);

            if (Physics.Raycast(ray, out RaycastHit hit, _interactRange, _interactableLayer))
            {
                IInteractable target = hit.collider.GetComponentInParent<IInteractable>();

                if (target != null && target != _currentTarget)
                {
                    ClearTarget();
                    _currentTarget = target;
                    _currentTarget.OnFocused();
                }
            }
            else
            {
                ClearTarget();
            }
        }

        private void HandleInteractPress()
        {
            if (_currentTarget?.InteractionType == InteractionType.Press)
                _currentTarget.Interact();
        }

        private void HandleInteractHold()
        {
            if (_currentTarget?.InteractionType == InteractionType.Hold)
                _currentTarget.Interact();
        }

        private void ClearTarget()
        {
            if (_currentTarget == null) return;
            _currentTarget.OnLostFocus();
            _currentTarget = null;
        }

        private void OnDrawGizmosSelected()
        {
            if (_camera == null) return;
            Gizmos.color = _currentTarget != null ? Color.green : Color.yellow;
            Gizmos.DrawRay(_camera.transform.position, _camera.transform.forward * _interactRange);
        }
    }
}