AppleHillsProduction/Assets/Scripts/Interactions/RequiresItemBehavior.cs

using UnityEngine;

/// <summary>
/// Interaction requirement that checks if the follower is holding a specific required item.
/// </summary>
[RequireComponent(typeof(Interactable))]
public class RequiresItemBehavior : InteractionRequirementBase
{
    [Header("Required Item")]
    public PickupItemData requiredItem;

    /// <summary>
    /// Attempts to interact, succeeds only if the follower is holding the required item.
    /// </summary>
    /// <param name="follower">The follower attempting the interaction.</param>
    /// <returns>True if the interaction was successful, false otherwise.</returns>
    public override bool TryInteract(FollowerController follower)
    {
        var heldItem = follower.CurrentlyHeldItem;
        if (heldItem == requiredItem)
        {
            OnSuccess?.Invoke();
            return true;
        }
        else
        {
            string requiredName = requiredItem != null ? requiredItem.itemName : "required item";
            if (heldItem == null)
            {
                DebugUIMessage.Show($"You need {requiredName} to interact.");
            }
            else
            {
                string heldName = heldItem.itemName ?? "an item";
                DebugUIMessage.Show($"You need {requiredName}, but you are holding {heldName}.");
            }
            OnFailure?.Invoke();
            return false;
        }
    }
}