// WL-816r 후속 — 816q 상태(원본 mat/텍스처) vs 816r 상태(Arena2) 를 **같은 조건**에서 A/B.
// 지표 = 816q 정의: 보이는 풀 %(풀 ON vs OFF 픽셀 차) · 에지 % · HF · 바닥 초록 화면색.
public static class WL816r_Ab
{
    public static void Start()
    {
        var go = UnityEngine.GameObject.Find("~WL816rAb");
        if (go != null) UnityEngine.Object.DestroyImmediate(go);
        go = new UnityEngine.GameObject("~WL816rAb");
        go.AddComponent<WL816r_AbRun>();
    }
}

public class WL816r_AbRun : UnityEngine.MonoBehaviour
{
    static System.Text.StringBuilder sb;
    const int W = 1080, H = 1920;
    static string Dir = "Screenshots_WL/WL816r";

    static int s_instQ, s_instR;
    void Start() { StartCoroutine(Co()); }

    System.Collections.IEnumerator Co()
    {
        sb = new System.Text.StringBuilder();
        System.IO.Directory.CreateDirectory(Dir);
        if (UnityEngine.SceneManagement.SceneManager.sceneCount < 2)
        {
            var op = UnityEngine.SceneManagement.SceneManager.LoadSceneAsync("Level01", UnityEngine.SceneManagement.LoadSceneMode.Additive);
            while (op != null && !op.isDone) yield return null;
        }
        for (int i = 0; i < 7; i++) yield return new UnityEngine.WaitForSeconds(1f);

        var g = UnityEngine.Object.FindFirstObjectByType<WL.Look.Farm.WLIslandGrass>(UnityEngine.FindObjectsInactive.Include);
        if (g == null) { L("WLIslandGrass 없음 — 중단"); Flush(); yield break; }

        var src = WL.Look.Farm.WLIslandLookSettings.Instance;
        var rt = UnityEngine.Object.Instantiate(src);            // 에셋 무변경 — 런타임 복제본
        if (rt.scatter != null)
        {
            var arr = new WL.Look.Farm.WLScatterDef[rt.scatter.Length];
            for (int i = 0; i < arr.Length; i++)
            {
                var s = rt.scatter[i];
                arr[i] = new WL.Look.Farm.WLScatterDef { enabled_ = s.enabled_, label = s.label, mesh = s.mesh, material = s.material, probability = s.probability, scale = s.scale, normalOffset = s.normalOffset, density = s.density };
            }
            rt.scatter = arr;
        }
        g.cfg = rt;

        var matR = src.islandTopMaterial;                                     // 816r (Arena2)
        var matQ = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Material>(
            "Assets/WL/Look/Farm/Materials/Farm_IslandTop_Arena.mat");          // 816q (원본)
        L("816r mat=" + (matR ? matR.name : "-") + " tex=" + TexName(matR) + " | 816q mat=" + (matQ ? matQ.name : "-") + " tex=" + TexName(matQ));
        if (matQ == null) { L("원본 머티리얼 로드 실패 — 중단"); Flush(); yield break; }
        L("머티리얼 값 대조 " + Cmp(matQ, matR));

        var topR = new System.Collections.Generic.List<UnityEngine.Renderer>();
        foreach (var r in UnityEngine.Object.FindObjectsByType<UnityEngine.Renderer>(UnityEngine.FindObjectsSortMode.None))
            foreach (var m in r.sharedMaterials) if (m != null && m == matR) { topR.Add(r); break; }
        L("섬윗면 렌더러=" + topR.Count);

        var cam = MakePd();

        // ── A: 816q 상태 ──────────────────────────────────────────────────
        SwapMat(topR, matR, matQ);
        yield return null; yield return null;
        rt.grassEnabled = 1; g.Rebuild(); yield return null; yield return null; yield return null;
        var qOn = Shot(cam); s_instQ = WL.Look.Farm.WLIslandGrass.Instances;
        rt.grassEnabled = 0; g.Rebuild(); yield return null; yield return null; yield return null;
        var qOff = Shot(cam);
        L("[816q] " + Metrics(qOn, qOff) + " · 풀 인스턴스(ON시)=" + s_instQ);
        System.IO.File.WriteAllBytes(Dir + "/ab_816q.png", UnityEngine.ImageConversion.EncodeToPNG(ToTex(qOn)));

        // ── B: 816r 상태 ──────────────────────────────────────────────────
        SwapMat(topR, matQ, matR);
        yield return null; yield return null;
        rt.grassEnabled = 1; g.Rebuild(); yield return null; yield return null; yield return null;
        var rOn = Shot(cam); s_instR = WL.Look.Farm.WLIslandGrass.Instances;
        rt.grassEnabled = 0; g.Rebuild(); yield return null; yield return null; yield return null;
        var rOff = Shot(cam);
        L("[816r] " + Metrics(rOn, rOff) + " · 풀 인스턴스(ON시)=" + s_instR);
        System.IO.File.WriteAllBytes(Dir + "/ab_816r.png", UnityEngine.ImageConversion.EncodeToPNG(ToTex(rOn)));

        // 풀 다시 켜고 마무리
        rt.grassEnabled = 1; g.Rebuild();
        Flush();
    }

    UnityEngine.Color32[] Shot(UnityEngine.Camera cam)
    {
        var tex = Grab(cam, W, H);
        var px = tex.GetPixels32();
        UnityEngine.Object.DestroyImmediate(tex);
        return px;
    }
    static UnityEngine.Texture2D ToTex(UnityEngine.Color32[] px)
    {
        var t = new UnityEngine.Texture2D(W, H, UnityEngine.TextureFormat.RGB24, false);
        t.SetPixels32(px); t.Apply();
        return t;
    }

    // 816q 지표
    static bool Ground(UnityEngine.Color32 p) { return p.g > p.b + 8 && p.g > 45; }
    static float Lum(UnityEngine.Color32 p) { return 0.299f * p.r + 0.587f * p.g + 0.114f * p.b; }

    static string Metrics(UnityEngine.Color32[] on, UnityEngine.Color32[] off)
    {
        int gn = 0, vis = 0;
        long rr = 0, gg = 0, bb = 0; int cn = 0;
        for (int i = 0; i < off.Length; i++)
        {
            if (!Ground(off[i])) continue;
            gn++;
            rr += off[i].r; gg += off[i].g; bb += off[i].b; cn++;
            if (System.Math.Abs(Lum(on[i]) - Lum(off[i])) > 8f) vis++;
        }
        // 에지 % (풀 ON · 지면 픽셀)
        int ed = 0, edn = 0;
        double hf = 0; int hfn = 0;
        for (int y = 0; y < H - 1; y++)
            for (int x = 0; x < W - 1; x++)
            {
                int i = y * W + x;
                if (!Ground(on[i])) continue;
                edn++;
                var r0 = on[i + 1]; var d0 = on[i + W];
                if ((Ground(r0) && System.Math.Abs(Lum(on[i]) - Lum(r0)) > 8) || (Ground(d0) && System.Math.Abs(Lum(on[i]) - Lum(d0)) > 8)) ed++;
            }
        // HF = 8×8 블록 내 편차 평균
        int bs = 8;
        for (int by = 0; by + bs <= H; by += bs)
            for (int bx = 0; bx + bs <= W; bx += bs)
            {
                double s = 0; int n = 0;
                for (int y = 0; y < bs; y++) for (int x = 0; x < bs; x++)
                    { var p = on[(by + y) * W + bx + x]; if (!Ground(p)) continue; s += Lum(p); n++; }
                if (n < bs * bs / 2) continue;
                double mean = s / n;
                for (int y = 0; y < bs; y++) for (int x = 0; x < bs; x++)
                    { var p = on[(by + y) * W + bx + x]; if (!Ground(p)) continue; hf += System.Math.Abs(Lum(p) - mean); hfn++; }
            }
        string col = cn == 0 ? "-" : string.Format("#{0:X2}{1:X2}{2:X2}", rr / cn, gg / cn, bb / cn);
        return string.Format("지면px(풀off)={0} · 보이는 풀={1:F2}% · 에지%={2:F2} · HF={3:F2} · 바닥초록={4}",
            gn, gn == 0 ? 0f : 100f * vis / gn, edn == 0 ? 0f : 100f * ed / edn, hfn == 0 ? 0 : hf / hfn, col);
    }

    static UnityEngine.Material FindMat(string name)
    {
        foreach (var m in UnityEngine.Resources.FindObjectsOfTypeAll<UnityEngine.Material>())
            if (m != null && m.name == name) return m;
        return null;
    }
    static string TexName(UnityEngine.Material m)
    {
        if (m == null) return "-";
        var t = m.GetTexture("_BaseMap");
        return t ? t.name : "-";
    }
    static string Cmp(UnityEngine.Material a, UnityEngine.Material b)
    {
        string[] fs = { "_Shades", "_Brightness", "_MinimumDarkness", "_Cloud_Strength", "_Cloud_Density", "_Cloud_Cover", "_Cloud_Change" };
        string[] cs = { "_DiffuseColor", "_ShadowDiffuseColor" };
        var s = new System.Text.StringBuilder();
        int diff = 0;
        foreach (var f in fs) { float x = a.GetFloat(f), y = b.GetFloat(f); if (UnityEngine.Mathf.Abs(x - y) > 0.0001f) { diff++; s.Append(" " + f + " " + x + "→" + y); } }
        foreach (var c in cs) { var x = a.GetColor(c); var y = b.GetColor(c); if (x != y) { diff++; s.Append(" " + c + " " + x + "→" + y); } }
        var ka = string.Join(",", a.shaderKeywords); var kb = string.Join(",", b.shaderKeywords);
        if (ka != kb) { diff++; s.Append(" kw [" + ka + "]→[" + kb + "]"); }
        // 텍스처 임포트 성질
        var ta = a.GetTexture("_BaseMap") as UnityEngine.Texture2D;
        var tb = b.GetTexture("_BaseMap") as UnityEngine.Texture2D;
        if (ta != null && tb != null)
            s.Append(" | tex A " + ta.width + "x" + ta.height + "/" + ta.format + "/" + ta.filterMode + "/mip" + ta.mipmapCount
                   + " B " + tb.width + "x" + tb.height + "/" + tb.format + "/" + tb.filterMode + "/mip" + tb.mipmapCount);
        return (diff == 0 ? "값 차이 0" : "차이 " + diff + "건:") + s;
    }

    static void SwapMat(System.Collections.Generic.List<UnityEngine.Renderer> rs, UnityEngine.Material from, UnityEngine.Material to)
    {
        foreach (var r in rs)
        {
            var ms = r.sharedMaterials; bool hit = false;
            for (int i = 0; i < ms.Length; i++) if (ms[i] == from) { ms[i] = to; hit = true; }
            if (hit) r.sharedMaterials = ms;
        }
    }
    static UnityEngine.Camera MakePd()
    {
        UnityEngine.Vector3 tgt = UnityEngine.Vector3.zero;
        var pc = UnityEngine.GameObject.FindGameObjectWithTag("Player"); if (pc != null) tgt = pc.transform.position;
        var go = UnityEngine.GameObject.Find("~816rAbPd"); if (go == null) go = new UnityEngine.GameObject("~816rAbPd");
        var c = go.GetComponent<UnityEngine.Camera>(); if (c == null) c = go.AddComponent<UnityEngine.Camera>();
        c.orthographic = false; c.fieldOfView = 60f; c.nearClipPlane = 0.1f; c.farClipPlane = 300f;
        c.transform.rotation = UnityEngine.Quaternion.Euler(45f, 45f, 0f);
        c.transform.position = tgt - c.transform.forward * 12f;
        c.enabled = false; return c;
    }
    static UnityEngine.Texture2D Grab(UnityEngine.Camera cam, int w, int h)
    {
        var rt = new UnityEngine.RenderTexture(w, h, 24, UnityEngine.RenderTextureFormat.ARGB32, UnityEngine.RenderTextureReadWrite.sRGB);
        rt.Create(); cam.targetTexture = rt; cam.Render();
        var prev = UnityEngine.RenderTexture.active; UnityEngine.RenderTexture.active = rt;
        var tex = new UnityEngine.Texture2D(w, h, UnityEngine.TextureFormat.RGB24, false);
        tex.ReadPixels(new UnityEngine.Rect(0, 0, w, h), 0, 0); tex.Apply();
        UnityEngine.RenderTexture.active = prev; cam.targetTexture = null;
        rt.Release(); UnityEngine.Object.DestroyImmediate(rt);
        return tex;
    }
    static void L(string s) { sb.AppendLine(s); Flush(); }
    static void Flush()
    {
        System.IO.File.WriteAllText("AgentScripts/WL816r_AB.txt", sb.ToString());
        UnityEngine.Debug.Log("[816r ab]\n" + sb.ToString());
    }
}