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++;

        // ✨ 힘 대신 공격력(+10) 증가
        if (stats != null) stats.AddBaseLevelUpStats(1000f, 10f);

        if (pHealth != null) pHealth.RefreshHealthUI();
        StartCoroutine(DelayedCardPopup());
    }

    private IEnumerator DelayedCardPopup()
    {
        yield return new WaitForSeconds(1.5f);
        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}";
    }
}