using Sirenix.OdinInspector;
using UnityEngine;

namespace DDD
{
    public class RestaurantCharacterInteraction : MonoBehaviour, IInteractor, IEventHandler<RestaurantInteractionEvent>
    {
        [SerializeField, ReadOnly] protected Collider[] _nearColliders = new Collider[10];

        protected IInteractable _nearestInteractable;
        protected IInteractable _previousInteractable;
        protected IInteractable _interactingTarget;

        protected float _interactHeldTime;
        protected bool _isInteracting;
        
        protected float _interactionRadius = 1f;
        protected LayerMask _interactionLayerMask = (LayerMask)(-1);

        protected virtual void Start() { }

        protected virtual void Update()
        {
            _nearestInteractable = GetNearestInteractable();

            if (_nearestInteractable != _previousInteractable)
            {
                _previousInteractable = _nearestInteractable;
                OnNearestInteractableChanged(_nearestInteractable);
            }

            if (_isInteracting)
            {
                if (_nearestInteractable != _interactingTarget)
                {
                    ResetInteractionState();
                    return;
                }

                _interactHeldTime += Time.deltaTime;

                float requiredHoldTime = _interactingTarget.GetRequiredHoldTime();
                float ratio = Mathf.Clamp01(_interactHeldTime / requiredHoldTime);

                if (_interactHeldTime >= requiredHoldTime)
                {
                    _isInteracting = false;
                    _interactingTarget.OnInteracted(this);
                    _interactingTarget = null;
                    OnInteractionCompleted();
                }

                OnInteractionHoldProgress(ratio);
            }
        }

        protected virtual void OnDestroy() { }

        protected virtual void OnNearestInteractableChanged(IInteractable newTarget) { }
        protected virtual void OnInteractionHoldProgress(float ratio) { }
        protected virtual void OnInteractionCompleted() { }

        protected void ResetInteractionState()
        {
            _isInteracting = false;
            _interactHeldTime = 0f;
            OnInteractionHoldProgress(0f);
            _interactingTarget = null;
        }

        protected IInteractable GetNearestInteractable()
        {
            int nearColliderCount = Physics.OverlapSphereNonAlloc(transform.position, _interactionRadius, 
                _nearColliders, _interactionLayerMask, QueryTriggerInteraction.Collide);

            IInteractable nearest = null;
            float minSqrDistance = float.MaxValue;

            for (int i = 0; i < nearColliderCount; i++)
            {
                var interactable = _nearColliders[i].GetComponent<IInteractable>();
                if (interactable == null || !interactable.CanInteract()) continue;

                float sqrDistance = (interactable.GetInteractableGameObject().transform.position - transform.position).sqrMagnitude;
                if (sqrDistance < minSqrDistance)
                {
                    minSqrDistance = sqrDistance;
                    nearest = interactable;
                }
            }

            return nearest;
        }

        public virtual void Invoke(RestaurantInteractionEvent evt) { }

        public GameObject GetInteractorGameObject() => gameObject;
    }
}