// ─────────────────────────────────────────────────────────────────────────────
//  StatPopup.cs — 레벨업 스탯 팝업 (WL-813g §4 · #813)
//
//  기준서 v1 §B 요소 5 「레벨업 = FX + HP/MP 전회복 + **스탯 팝업 3개**」 · §C 요소 5 「이벤트 0 → 813k(S)」.
//
//  🔴 **현재 상태 = 인터페이스 + 표시만 (발생원은 후속)**
//    · `WL.Combat.Core.CombatEvents.LevelUp` 는 811b 가 **API 만** 만들어 두었고 발생 지점
//      (`ServerClass.Add_Exp :2729-2734` · Systems 소유)은 **813k** 몫이다 — 이 세션 시점에
//      `wl/gameplay/WL-813k-levelup` 브랜치에는 실작업 커밋이 없다(`git diff main...` 비어 있음 · 실측).
//    · 그래서 페이로드는 지금 `{pc, newLevel}` 뿐이다. 이전/새 스탯 3개를 813k 가 실어 보내면
//      **`StatPopup.Report(...)` 로 그대로 밀어 넣으면 된다**(아래 공개 API · 이 파일만 수정하면 끝).
//    · 그 전까지는 이 컴포넌트가 스스로 **직전 스냅샷과의 차이**로 스탯 증가분을 만든다(대체 경로).
//
//  ■ 롤백(C8) — 설정이 없거나 textEnabled/statPopupEnabled = false 면 구독 0 · 표시 0.
//
//  🔴 어셈블리 주의: Assets/WL/UI/ 에 .asmdef 를 만들지 말 것(Assembly-CSharp 단일).
// ─────────────────────────────────────────────────────────────────────────────

using System.Collections.Generic;
using System.Text;
using TMPro;
using UnityEngine;
using WL.Combat.Core;

namespace WL.UI
{
    /// <summary>스탯 한 줄 — 813k 가 이전/새 값을 실어 보낼 때 쓰는 페이로드.</summary>
    public struct WLStatDelta
    {
        public string name;
        public double prev;
        public double next;
        public double Delta { get { return next - prev; } }
    }

    [DisallowMultipleComponent]
    [RequireComponent(typeof(RectTransform))]
    public class StatPopup : MonoBehaviour
    {
        [Header("구성 요소 (BuildIfNeeded 가 만든다)")]
        [SerializeField] private CanvasGroup group;
        [SerializeField] private RectTransform box;
        [SerializeField] private TextMeshProUGUI titleLabel;
        [SerializeField] private TMP_FontAsset font;

        private readonly List<TextMeshProUGUI> _rows = new List<TextMeshProUGUI>();
        private readonly Dictionary<int, double> _snapshot = new Dictionary<int, double>();
        private RectTransform _rt;
        private bool _subscribed;
        private float _life, _lifeMax, _elapsed;

        /// <summary>813k(또는 다른 발생원)가 찾아 쓸 수 있는 현재 활성 팝업.</summary>
        public static StatPopup Active { get; private set; }

        // ── 진단(프로브가 읽는다 · 실측만)
        public int LevelUpSeen { get; private set; }
        public int LastLevel { get; private set; }
        public int LastRowCount { get; private set; }
        public string LastText { get; private set; }
        public bool Subscribed { get { return _subscribed; } }
        public bool Visible { get { return group != null && group.alpha > 0f; } }

        private void OnEnable() { Initialize(); }
        private void OnDisable() { Subscribe(false); if (Active == this) Active = null; }

        /// <summary>OnEnable 본체 분리(813c 교훈) — 에디트 모드도 같은 경로.</summary>
        public string Initialize()
        {
            _rt = GetComponent<RectTransform>();
            Active = this;
            BuildIfNeeded();
            string layout = ApplyLayout();
            Hide();
            var s = WLCombatTextSettings.Instance;
            bool on = WLCombatTextSettings.Enabled && s != null && s.statPopupEnabled;
            Subscribe(on);
            TakeSnapshot();
            return (on ? "구독 ON · " : "설정 off — 구독 0 · ") + layout;
        }

        public void Subscribe(bool on)
        {
            if (on == _subscribed) return;
            if (on) CombatEvents.LevelUp.Add(OnLevelUp);
            else CombatEvents.LevelUp.Remove(OnLevelUp);
            _subscribed = on;
        }

        public bool BuildIfNeeded()
        {
            if (_rt == null) _rt = GetComponent<RectTransform>();
            var s = WLCombatTextSettings.Instance;
            int want = s != null ? Mathf.Max(1, s.statPopupRows) : 3;
            bool made = false;

            if (group == null)
            {
                group = GetComponent<CanvasGroup>();
                if (group == null) { group = gameObject.AddComponent<CanvasGroup>(); made = true; }
                group.interactable = false; group.blocksRaycasts = false;
            }
            if (box == null) { box = WLTextFxUtil.NewChild(_rt, "Box"); made = true; }
            if (titleLabel == null) { titleLabel = WLTextFxUtil.NewText(box, "Title", font, TextAlignmentOptions.Center); made = true; }
            while (_rows.Count < want)
            {
                _rows.Add(WLTextFxUtil.NewText(box, "Row" + _rows.Count, font, TextAlignmentOptions.Center));
                made = true;
            }
            return made;
        }

        public string ApplyLayout()
        {
            var s = WLCombatTextSettings.Instance;
            if (s == null) return "WLCombatTextSettings 없음 — 배치 건너뜀";
            if (_rt == null) _rt = GetComponent<RectTransform>();
            if (box == null) return "구성 요소 없음 — BuildIfNeeded 먼저";

            float u = WLTextFxUtil.UnitsPerPx(this, s);
            WLTextFxUtil.Stretch(_rt);

            float h = (s.statPopupTitleFontPx + s.statPopupRowHeightPx * s.statPopupRows) * u;
            box.anchorMin = box.anchorMax = new Vector2(0.5f, 0.5f);
            box.pivot = new Vector2(0.5f, 0.5f);
            box.sizeDelta = new Vector2(s.designWidthPx * u, h);
            box.anchoredPosition = new Vector2(0f, s.statPopupCenterOffsetPx * u);

            titleLabel.rectTransform.anchorMin = titleLabel.rectTransform.anchorMax = new Vector2(0.5f, 1f);
            titleLabel.rectTransform.pivot = new Vector2(0.5f, 1f);
            titleLabel.rectTransform.sizeDelta = new Vector2(s.designWidthPx * u, s.statPopupTitleFontPx * 1.2f * u);
            titleLabel.rectTransform.anchoredPosition = Vector2.zero;
            titleLabel.fontSize = s.statPopupTitleFontPx * u;
            titleLabel.color = s.statPopupTitleColor;

            for (int i = 0; i < _rows.Count; i++)
            {
                var rt = _rows[i].rectTransform;
                rt.anchorMin = rt.anchorMax = new Vector2(0.5f, 1f);
                rt.pivot = new Vector2(0.5f, 1f);
                rt.sizeDelta = new Vector2(s.designWidthPx * u, s.statPopupRowHeightPx * u);
                rt.anchoredPosition = new Vector2(0f, -(s.statPopupTitleFontPx * 1.2f + s.statPopupRowHeightPx * i) * u);
                _rows[i].fontSize = s.statPopupRowFontPx * u;
                _rows[i].color = s.statPopupRowColor;
            }
            return "box pos=" + box.anchoredPosition + " size=" + box.sizeDelta + " rows=" + _rows.Count +
                   " unitsPerPx=" + u.ToString("F4") + " titleFont=" + titleLabel.fontSize.ToString("F1");
        }

        // ───────────────────────────────────────────── 이벤트 · 공개 API

        private void OnLevelUp(in LevelUpEvent e)
        {
            var s = WLCombatTextSettings.Instance;
            if (s == null || !WLCombatTextSettings.Enabled || !s.statPopupEnabled) return;
            Report(e.newLevel, BuildDeltasFromSnapshot(e.pc, s));
        }

        /// <summary>
        /// 🔵 813k 연결점 — 이전/새 스탯을 그대로 실어 보내면 이 메서드가 팝업을 띄운다.
        /// deltas 가 null 이면 컴포넌트가 스스로 스냅샷 차이를 만든다.
        /// </summary>
        public static string Report(int newLevel, WLStatDelta[] deltas)
        {
            if (Active == null) return "StatPopup 없음(프리팹 노드 미배치)";
            return Active.Show(newLevel, deltas);
        }

        /// <summary>팝업을 띄운다(프로브도 이 경로를 쓴다).</summary>
        public string Show(int newLevel, WLStatDelta[] deltas)
        {
            var s = WLCombatTextSettings.Instance;
            if (s == null) return "설정 없음";
            BuildIfNeeded();
            ApplyLayout();

            LevelUpSeen++; LastLevel = newLevel;
            titleLabel.text = DSUtil.Format(s.statPopupTitleFormat, newLevel);

            int shown = 0;
            var sb = new StringBuilder(titleLabel.text);
            for (int i = 0; i < _rows.Count; i++)
            {
                bool has = deltas != null && i < deltas.Length;
                double d = has ? deltas[i].Delta : 0d;
                if (!has || (!s.statPopupShowZero && d <= 0d)) { _rows[i].text = ""; continue; }
                _rows[i].text = DSUtil.Format(s.statPopupRowFormat, deltas[i].name, d.ToString("N0"), deltas[i].next.ToString("N0"));
                sb.Append(" / ").Append(_rows[i].text);
                shown++;
            }
            LastRowCount = shown;
            LastText = sb.ToString();

            _lifeMax = _life = Mathf.Max(0.01f, s.statPopupSeconds);
            _elapsed = 0f;
            group.alpha = 1f;
            box.localScale = Vector3.one * WLTextFxUtil.PunchScale(0f, s.statPopupPunchScale, s.statPopupPunchSeconds);
            TakeSnapshot();
            return "level=" + newLevel + " rows=" + shown + " text=\"" + LastText + "\" pos=" + box.anchoredPosition;
        }

        public void Hide()
        {
            if (group != null) group.alpha = 0f;
            if (box != null) box.localScale = Vector3.one;
            _life = 0f;
        }

        private void Update()
        {
            if (_life <= 0f) return;
            var s = WLCombatTextSettings.Instance;
            if (s == null) { Hide(); return; }
            float dt = Time.unscaledDeltaTime;
            _life -= dt; _elapsed += dt;
            float passed = WLTextFxUtil.Passed(_life, _lifeMax);
            group.alpha = WLTextFxUtil.FadeAlpha(passed, s.statPopupFadeStartRatio);
            box.localScale = Vector3.one * WLTextFxUtil.PunchScale(_elapsed, s.statPopupPunchScale, s.statPopupPunchSeconds);
            if (_life <= 0f) Hide();
        }

        // ───────────────────────────────────────────── 스냅샷 대체 경로(813k 전까지)

        /// <summary>설정에 적힌 스탯들의 현재 값을 기억한다.</summary>
        public void TakeSnapshot()
        {
            var s = WLCombatTextSettings.Instance;
            if (s == null || s.statPopupStats == null) return;
            var stat = (Application.isPlaying && MyValue.bMyPC && MyValue.MyPC != null) ? MyValue.MyPC.Get_StatInfo() : null;
            if (stat == null) return;
            for (int i = 0; i < s.statPopupStats.Length; i++)
                _snapshot[(int)s.statPopupStats[i]] = stat.Get_Stat(s.statPopupStats[i]);
        }

        private WLStatDelta[] BuildDeltasFromSnapshot(Actor pc, WLCombatTextSettings s)
        {
            if (s.statPopupStats == null || s.statPopupStats.Length == 0) return null;
            var actor = pc != null ? pc : (MyValue.bMyPC ? (Actor)MyValue.MyPC : null);
            if (actor == null) return null;
            var stat = actor.Get_StatInfo();
            if (stat == null) return null;

            int n = Mathf.Min(s.statPopupStats.Length, Mathf.Max(1, s.statPopupRows));
            var arr = new WLStatDelta[n];
            for (int i = 0; i < n; i++)
            {
                var key = s.statPopupStats[i];
                double now = stat.Get_Stat(key);
                double prev;
                if (!_snapshot.TryGetValue((int)key, out prev)) prev = now;
                arr[i] = new WLStatDelta { name = key.ToString(), prev = prev, next = now };
            }
            return arr;
        }

        // ───────────────────────────────────────────── 프로브(에디트 모드 · Play 0)

        /// <summary>합성 레벨업 이벤트 — 811b 코어의 실제 Dispatch 경로(구독 배선까지 검증).</summary>
        public static string RaiseFakeLevelUp(int newLevel)
        {
            var e = new LevelUpEvent { pc = null, newLevel = newLevel, time = Time.unscaledTime, frame = Time.frameCount };
            CombatEvents.LevelUp.Dispatch(in e);
            return "dispatch LevelUp level=" + newLevel + " · 구독자=" + CombatEvents.LevelUp.Count;
        }

        /// <summary>합성 스탯 델타로 직접 표시(813k 페이로드가 오면 이 모양이 된다).</summary>
        public string ShowFake(int newLevel, string[] names, double[] prev, double[] next)
        {
            int n = Mathf.Min(names.Length, Mathf.Min(prev.Length, next.Length));
            var arr = new WLStatDelta[n];
            for (int i = 0; i < n; i++) arr[i] = new WLStatDelta { name = names[i], prev = prev[i], next = next[i] };
            return Show(newLevel, arr);
        }

        public string Dump()
        {
            var sb = new StringBuilder();
            sb.AppendLine("StatPopup subscribed=" + _subscribed + " levelUpSeen=" + LevelUpSeen +
                          " lastLevel=" + LastLevel + " rows=" + LastRowCount +
                          " alpha=" + (group != null ? group.alpha.ToString("F2") : "-"));
            sb.AppendLine("  title=\"" + (titleLabel != null ? titleLabel.text : "") + "\" pos=" +
                          (box != null ? box.anchoredPosition.ToString() : "-") +
                          " size=" + (box != null ? box.sizeDelta.ToString() : "-") +
                          " scale=" + (box != null ? box.localScale.x.ToString("F3") : "-"));
            for (int i = 0; i < _rows.Count; i++)
                sb.AppendLine("  row[" + i + "] \"" + _rows[i].text + "\" pos=" + _rows[i].rectTransform.anchoredPosition +
                              " font=" + _rows[i].fontSize.ToString("F1"));
            return sb.ToString();
        }

        public void SetFont(TMP_FontAsset f)
        {
            font = f;
            if (titleLabel != null && f != null) titleLabel.font = f;
            for (int i = 0; i < _rows.Count; i++) if (_rows[i] != null && f != null) _rows[i].font = f;
        }
    }
}