EerieVillage/Assets/Scripts/Progression/LevelUpManager.cs

using System.Collections.Generic;
using UnityEngine;
using Platformer.Mechanics;
using EerieVillage.MyUI;

namespace EerieVillage.Progression
{
    /// <summary>
    /// 레벨업 발화 시 일시정지 + UI 호출 + 카드 선택 결과 수령.
    /// PlayerProgression.OnLevelUp 구독.
    ///
    /// Phase 2-B 영역 (2026-05-08) — SkillSelectionUI 정식 통합.
    /// </summary>
    public class LevelUpManager : MonoBehaviour
    {
        public static LevelUpManager Instance { get; private set; }

        [SerializeField] SkillCardPlaceholderPool _pool;
        [SerializeField] SkillSelectionUI _ui;

        PlayerController _player;
        PlayerProgression _progression;
        bool _isLevelUpActive = false;

        void Awake()
        {
            if (Instance != null && Instance != this)
            {
                Destroy(gameObject);
                return;
            }
            Instance = this;
        }

        void Start()
        {
            _player = Object.FindFirstObjectByType<PlayerController>();
            if (_player == null)
            {
                Debug.LogWarning("[LevelUpManager] PlayerController 영역 부재 — Start 시점 참조 X");
                return;
            }

            _progression = _player.GetComponent<PlayerProgression>();
            if (_progression == null)
            {
                _progression = _player.gameObject.AddComponent<PlayerProgression>();
            }
            _progression.OnLevelUp += HandleLevelUp;

            if (_pool == null) _pool = GetComponent<SkillCardPlaceholderPool>();
        }

        void OnDestroy()
        {
            if (_progression != null) _progression.OnLevelUp -= HandleLevelUp;
            if (Instance == this) Instance = null;
        }

        void HandleLevelUp(int newLevel)
        {
            Debug.Log($"[LevelUpManager] HandleLevelUp 호출 Lv.{newLevel} _ui={(_ui == null ? "NULL" : _ui.name)} _pool={(_pool == null ? "NULL" : _pool.name)}");
            if (_isLevelUpActive) return;
            _isLevelUpActive = true;

            // 일시정지 + 입력 차단
            Time.timeScale = 0f;
            if (_player != null) _player.controlEnabled = false;

            // 카드 3장 무작위 추출
            List<SkillCardPlaceholder> cards = _pool != null
                ? _pool.Draw3Random()
                : new List<SkillCardPlaceholder>();
            Debug.Log($"[LevelUpManager] cards.Count={cards.Count}");

            // Phase 2-B 영역 — SkillSelectionUI 정식 호출
            if (_ui != null)
            {
                Debug.Log($"[LevelUpManager] _ui.Show 호출 → SkillSelectionCanvas 활성 의도");
                _ui.Show(cards, newLevel, HandleCardConfirmed);
            }
            else
            {
                // UI 영역 부재 fallback (placeholder asset 5장 미등록 영역 등)
                Debug.LogWarning($"[LevelUpManager] SkillSelectionUI 부재 — Lv.{newLevel} 카드 {cards.Count}장 영역 자동 확정");
                HandleCardConfirmed(cards.Count > 0 ? cards[0] : null);
            }
        }

        void HandleCardConfirmed(SkillCardPlaceholder selected)
        {
            // UI 닫기
            if (_ui != null) _ui.Hide();

            // 차기 BT12-Dev 영역 = PlayerSkillInventory.AddSkillByCardId(selected.id)
            // BT12-MVP-A 영역 = UI 닫기·게임 재개만
            Debug.Log($"[LevelUpManager] 카드 확정 — {(selected != null ? selected.displayName : "NONE")} (효과 적용 X·BT12-Dev 본격 영역)");

            // 일시정지 해제 + 입력 복원
            Time.timeScale = 1f;
            if (_player != null) _player.controlEnabled = true;
            _isLevelUpActive = false;
        }
    }
}