using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

public class PlayerLevelSystem : MonoBehaviour
{
    [Header("--- 참조 ---")]
    [SerializeField] private Stats stats;
    [SerializeField] private PlayerHealth pHealth;

    [Header("레벨 설정")]
    public int level = 1;
    public int currentExp = 0;
    [SerializeField] private int[] expTable;

    [Header("UI")]
    [SerializeField] private Image expFillImage;
    [SerializeField] private TextMeshProUGUI expText;
    [SerializeField] private TextMeshProUGUI levelText;

    public static System.Action OnLevelUp;

    private int RequiredExp
    {
        get
        {
            int index = level - 1;
            if (index >= expTable.Length) return expTable[expTable.Length - 1];
            return expTable[index];
        }
    }

    private void OnEnable()
    {
        MonsterClass.OnMonsterKilled += GainExp;
        UpdateExpUI();
    }

    private void OnDisable()
    {
        MonsterClass.OnMonsterKilled -= GainExp;
    }

    void GainExp(int amount)
    {
        currentExp += amount;
        while (currentExp >= RequiredExp)
        {
            currentExp -= RequiredExp;
            LevelUp();
        }
        UpdateExpUI();
    }

    void LevelUp()
    {
        if (level >= expTable.Length + 1) { currentExp = 0; return; }

        level++;
        Debug.Log($"🎉 [LevelSystem] 레벨 업! 현재 레벨: {level}");

        // 1. 기초 스탯 먼저 상승 (체력 +1000, 힘 +100 - 유저님 설정값)
        if (stats != null) stats.AddBaseLevelUpStats(1000f, 100f);

        // 2. ⭐ [핵심] 늘어난 스탯으로 피 채우고 UI 즉시 갱신 함수 호출
        if (pHealth != null)
        {
            pHealth.RefreshHealthUI();
        }
        else
        {
            Debug.LogError("[LevelSystem] pHealth 참조가 비어있습니다! 인스펙터에 PlayerHealth를 드래그해서 넣어주세요.");
        }

        // 3. 1.5초 대기 후 카드 선택 UI 팝업
        StartCoroutine(DelayedCardPopup());
    }

    private IEnumerator DelayedCardPopup()
    {
        yield return new WaitForSeconds(1.5f);
        Debug.Log("1.5초 경과: 카드 UI 팝업 실행");
        OnLevelUp?.Invoke();
    }

    void UpdateExpUI()
    {
        float fill = (float)currentExp / RequiredExp;
        if (expFillImage != null) expFillImage.fillAmount = fill;
        if (expText != null) expText.text = $"{currentExp} / {RequiredExp}";
        if (levelText != null) levelText.text = $"Lv. {level}";
    }
}