using UnityEngine;

namespace EerieVillage.Progression
{
    /// <summary>
    /// 플레이어 레벨업 진행도. BT12-Dev v1 PlayerStats(패시브 보정)와 직무 분리 (Single Responsibility).
    /// EXP는 적 처치 시 누적. 임계점 도달 시 OnLevelUp 발화.
    /// EXP 곡선 = LevelXPTableLoader 영역 JSON SOT.
    /// </summary>
    public class PlayerProgression : MonoBehaviour
    {
        public int Level { get; private set; } = 1;
        public int CurrentXP { get; private set; } = 0;
        public int XPToNextLevel { get; private set; } = 100;

        /// <summary>레벨업 발화 — int = new Level. LevelUpManager 구독 hook.</summary>
        public event System.Action<int> OnLevelUp;

        void Awake()
        {
            XPToNextLevel = LevelXPTableLoader.GetXPToNextLevel(Level);
        }

        /// <summary>적 처치 시 호출 — XP 획득. amount <= 0 시 무시.</summary>
        public void GainXP(int amount)
        {
            if (amount <= 0) return;
            CurrentXP += amount;
            Debug.Log($"[PlayerProgression] GainXP +{amount} → Lv.{Level} {CurrentXP}/{XPToNextLevel}");
            while (CurrentXP >= XPToNextLevel)
            {
                CurrentXP -= XPToNextLevel;
                Level++;
                XPToNextLevel = LevelXPTableLoader.GetXPToNextLevel(Level);
                Debug.Log($"[PlayerProgression] LEVEL UP → Lv.{Level} (next {XPToNextLevel}) — OnLevelUp 발화");
                OnLevelUp?.Invoke(Level);
            }
        }
    }
}