using UnityEngine;
using UnityEngine.UI;
using WL.Player;

namespace WL.UI
{
    /// <summary>
    /// 좌상단 플레이어 레벨 표기 (PD #727 · 레퍼런스 XP Hero: 레벨 배지 + 경험치 바 "1.08M/1.19M").
    /// PlayerProgress.Changed 를 구독해 갱신한다. 표기 형식: 1,000 이상 K · 1,000,000 이상 M.
    /// </summary>
    public class PlayerLevelHud : MonoBehaviour
    {
        [Header("참조 (비우면 씬에서 찾는다)")]
        [SerializeField] private PlayerProgress progress;
        [Tooltip("레벨 숫자")]
        [SerializeField] private Text levelText;
        [Tooltip("경험치 텍스트 (현재/필요)")]
        [SerializeField] private Text xpText;
        [Tooltip("경험치 바 채움 이미지 (Image Type = Filled · Horizontal)")]
        [SerializeField] private Image xpFill;

        private void OnEnable()
        {
            Resolve();
            if (progress != null) progress.Changed += Refresh;
            Refresh();
        }

        private void OnDisable()
        {
            if (progress != null) progress.Changed -= Refresh;
        }

        private void Start() { Refresh(); }

        private void Resolve()
        {
            if (progress == null) progress = Object.FindFirstObjectByType<PlayerProgress>();
        }

        public void Refresh()
        {
            Resolve();
            if (progress == null) return;
            if (levelText != null) levelText.text = progress.Level.ToString();
            if (xpText != null) xpText.text = Format(progress.Xp) + "/" + Format(progress.XpToNext);
            if (xpFill != null) xpFill.fillAmount = progress.XpToNext > 0 ? Mathf.Clamp01((float)progress.Xp / progress.XpToNext) : 0f;
        }

        /// <summary>1.08M · 4.31K · 121 형식.</summary>
        public static string Format(long v)
        {
            if (v >= 1000000L) return (v / 1000000f).ToString("0.00") + "M";
            if (v >= 1000L) return (v / 1000f).ToString("0.00") + "K";
            return v.ToString();
        }
    }
}