using UnityEngine;

/// <summary>
/// Interaction requirement that allows combining the follower's held item with this pickup if a valid combination rule exists.
/// </summary>
[RequireComponent(typeof(Pickup))]
public class CombineWithBehavior : InteractionRequirementBase
{
    /// <summary>
    /// Attempts to combine the follower's held item with this pickup's item.
    /// </summary>
    /// <param name="follower">The follower attempting the interaction.</param>
    /// <returns>True if the combination was successful, false otherwise.</returns>
    public override bool TryInteract(FollowerController follower)
    {
        var heldItem = follower.currentlyHeldItem;
        var pickup = GetComponent<Pickup>();
        if (heldItem == null)
        {
            DebugUIMessage.Show("You need an item to combine.");
            OnFailure?.Invoke();
            return false;
        }
        if (pickup == null || pickup.itemData == null)
        {
            DebugUIMessage.Show("Target item is missing or invalid.");
            OnFailure?.Invoke();
            return false;
        }
        var rule = GameManager.Instance.GetCombinationRule(heldItem, pickup.itemData);
        if (rule != null && rule.result != null)
        {
            // Remove both items and add result to follower's inventory
            follower.SetHeldItem(rule.result);
            follower.justCombined = true;
            OnSuccess?.Invoke();
            return true;
        }
        else
        {
            string heldName = heldItem.itemName ?? "an item";
            string targetName = pickup.itemData.itemName ?? "target item";
            DebugUIMessage.Show($"Cannot combine {heldName} with {targetName}.");
            OnFailure?.Invoke();
            return false;
        }
    }
}