using UnityEngine;
using UnityEngine.Events;

namespace MedievalShopkeeper
{
    /// <summary>
    /// Base class for interactable shop entities (shelves, stock boxes, NPCs, registers).
    /// Can be added directly to objects with UnityEvents configured in the inspector,
    /// or inherited by specialized components like ShelfController or CustomerNPC.
    /// </summary>
    [SelectionBase]
    public class Interactable : MonoBehaviour, IInteractable
    {
        [Header("Interaction Settings")]
        [Tooltip("Text shown to the player when hovering/targeting this object.")]
        [SerializeField] private string prompt = "Interact";

        [Tooltip("Max distance the player must be within to trigger interaction.")]
        [SerializeField] private float interactionRange = 2f;

        [Tooltip("Optional specific point where the player should stand. If unassigned, defaults to this transform.")]
        [SerializeField] private Transform interactionPoint;

        [Tooltip("Whether interaction is currently permitted.")]
        [SerializeField] private bool isInteractable = true;

        [Header("Events")]
        public UnityEvent<PlayerController> onInteracted;
        public UnityEvent<PlayerController> onHoverEnter;
        public UnityEvent<PlayerController> onHoverExit;

        public virtual string InteractionPrompt => prompt;

        public virtual Transform InteractionTransform => interactionPoint != null ? interactionPoint : transform;

        public virtual float InteractionDistance => interactionRange;

        public virtual bool CanInteract(PlayerController player)
        {
            return isInteractable && enabled && gameObject.activeInHierarchy;
        }

        public virtual void Interact(PlayerController player)
        {
            if (!CanInteract(player)) return;
            onInteracted?.Invoke(player);
        }

        public virtual void OnHoverEnter(PlayerController player)
        {
            onHoverEnter?.Invoke(player);
        }

        public virtual void OnHoverExit(PlayerController player)
        {
            onHoverExit?.Invoke(player);
        }

        public void SetInteractable(bool interactable)
        {
            isInteractable = interactable;
        }

        public void SetPrompt(string newPrompt)
        {
            prompt = newPrompt;
        }

        protected virtual void OnDrawGizmosSelected()
        {
            Gizmos.color = Color.yellow;
            Vector3 center = InteractionTransform.position;
            Gizmos.DrawWireSphere(center, interactionRange);
        }
    }
}