Projext/Assets/Scripts/Level_Scripts/LevelUpUIManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI; // ⭐ 버튼 제어를 위해 필수!

public class LevelUpUIManager : MonoBehaviour
{
    [SerializeField] private GameObject panel;
    [SerializeField] private CardUI[] cardPrefabs;
    [SerializeField] private Transform cardParent;
    [SerializeField] private List<CardData> cardPool;

    [Header("--- 확정 버튼 설정 ---")]
    // ⭐ 이 변수가 있어야 인스펙터에 Apply Button 칸이 보입니다!
    [SerializeField] private Button applyButton;

    private CardUI _selectedCardUI; // 현재 클릭된 카드 저장용

    private void OnEnable()
    {
        PlayerLevelSystem.OnLevelUp += Show;
        // ⭐ 버튼 클릭 시 OnApplyButtonClick 실행하도록 연결
        if (applyButton != null) applyButton.onClick.AddListener(OnApplyButtonClick);
    }

    private void OnDisable()
    {
        PlayerLevelSystem.OnLevelUp -= Show;
        if (applyButton != null) applyButton.onClick.RemoveListener(OnApplyButtonClick);
    }

    void Show()
    {
        panel.SetActive(true);
        Time.timeScale = 0f;

        _selectedCardUI = null;
        if (applyButton != null) applyButton.interactable = false;

        foreach (Transform child in cardParent)
            Destroy(child.gameObject);

        int slotCount = 2;

        /* =========================
         * 1️⃣ CardData 선택 (중복 없음)
         * ========================= */
        List<CardData> selectedCards = new List<CardData>();
        List<CardData> tempDataPool = new List<CardData>(cardPool);

        for (int i = 0; i < slotCount; i++)
        {
            int idx = Random.Range(0, tempDataPool.Count);
            selectedCards.Add(tempDataPool[idx]);
            tempDataPool.RemoveAt(idx);
        }

        /* =========================
         * 2️⃣ CardUI 프리팹 선택 (중복 없음)
         * ========================= */
        List<CardUI> tempPrefabs = new List<CardUI>(cardPrefabs);

        for (int i = 0; i < slotCount; i++)
        {
            int idx = Random.Range(0, tempPrefabs.Count);
            CardUI ui = Instantiate(tempPrefabs[idx], cardParent);
            ui.Setup(selectedCards[i], this);
            tempPrefabs.RemoveAt(idx);
        }
    }

    // 카드를 클릭했을 때 호출 (선택 상태 표시)
    public void OnCardClick(CardUI clickedUI)
    {
        if (_selectedCardUI != null) _selectedCardUI.SetSelected(false);
        _selectedCardUI = clickedUI;
        _selectedCardUI.SetSelected(true);

        if (applyButton != null) applyButton.interactable = true; // ⭐ 드디어 버튼 활성화!
    }

    // APPLY 버튼을 눌렀을 때만 최종 적용!
    private void OnApplyButtonClick()
    {
        if (_selectedCardUI == null) return;
        _selectedCardUI.ApplyCurrentEffect();
        Close();
    }

    public void Close()
    {
        Time.timeScale = 1f;
        panel.SetActive(false);
    }
}