using UnityEngine;
using Ashwild.Inventory;

namespace Ashwild.Player
{
    /// <summary>
    /// Held-item logic for consumables, placed on the food/drink hand prefab. While
    /// the prefab is equipped it listens to the use input and eats/drinks the item via
    /// PlayerInventory.UseItem, which applies the restore effects, raises ItemConsumed
    /// and removes one. No animation here — the FPS arm model plays its own.
    /// </summary>
    [DisallowMultipleComponent]
    public class ConsumableBehaviour : MonoBehaviour, IHeldItemBehaviour
    {
        #region Serialized Fields

        [Header("Cooldown")]
        /// <summary>
        /// Minimum time, in seconds, between two consumptions.
        /// </summary>
        [SerializeField] private float useCooldown = 0.5f;

        #endregion

        #region State

        /// <summary>
        /// Earliest time, in seconds, the next consumption is allowed.
        /// </summary>
        private float nextUseTime;

        #endregion

        #region Unity Lifecycle

        /// <summary>
        /// Subscribes to the use input for as long as this item is held.
        /// </summary>
        private void OnEnable()
        {
            PlayerEvents.AttackPressed += HandleAttackPressed;
        }

        /// <summary>
        /// Unsubscribes when the item is put away (the prefab is destroyed).
        /// </summary>
        private void OnDisable()
        {
            PlayerEvents.AttackPressed -= HandleAttackPressed;
        }

        #endregion

        #region IHeldItemBehaviour

        /// <summary>
        /// Nothing to link: consuming reads the selected hotbar slot directly. Present
        /// to satisfy the held-item contract.
        /// </summary>
        public void Setup(HeldItemContext context, ItemData item)
        {
        }

        #endregion

        #region Event Handlers

        /// <summary>
        /// Consumes one unit on use input, gated by lock and cooldown.
        /// </summary>
        private void HandleAttackPressed()
        {
            if (PlayerEvents.InputLocked) return;
            if (Time.time < nextUseTime) return;
            if (PlayerInventory.Instance == null) return;

            nextUseTime = Time.time + useCooldown;
            PlayerInventory.Instance.UseItem(PlayerInventory.Instance.SelectedHotbarIndex);
        }

        #endregion
    }
}