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 true;
        }
        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.resultPrefab != null)
        {
            // Instantiate the result prefab at the pickup's position
            var resultObj = GameObject.Instantiate(rule.resultPrefab, pickup.transform.position, Quaternion.identity);
            var resultPickup = resultObj.GetComponent<Pickup>();
            if (resultPickup != null)
            {
                // Hide and parent to follower
                resultObj.SetActive(false);
                resultObj.transform.SetParent(follower.transform);
                // Set held item and icon from the spawned prefab
                follower.SetHeldItem(resultPickup.itemData, resultPickup.iconRenderer);
                // Cache the spawned object as the held item
                follower.CacheHeldPickupObject(resultObj);
                follower.justCombined = true;
                OnSuccess?.Invoke();
                return true;
            }
            else
            {
                Debug.LogWarning("Result prefab does not have a Pickup component.");
                GameObject.Destroy(resultObj);
                OnFailure?.Invoke();
                return false;
            }
        }
        else
        {
            // DebugUIMessage.Show($"Cannot combine {heldItem.itemName ?? \"an item\"} with {pickup.itemData.itemName ?? \"target item\"}.");
            OnFailure?.Invoke();
            return true;
        }
    }
}