// WL-816o 진단 — 화면에 그려진 구름 띠 경계 ↔ CPU 가 계산한 띠 경계가 왜 어긋나는가.
public static class WL816o_Diag
{
    public static void Start()
    {
        var go = UnityEngine.GameObject.Find("~WL816oDiag");
        if (go != null) UnityEngine.Object.DestroyImmediate(go);
        go = new UnityEngine.GameObject("~WL816oDiag");
        go.AddComponent<WL816o_DiagRunner>();
    }
}

public class WL816o_DiagRunner : UnityEngine.MonoBehaviour
{
    const int TW = 512;
    static System.Text.StringBuilder sb;
    void Start() { StartCoroutine(Co()); }

    System.Collections.IEnumerator Co()
    {
        sb = new System.Text.StringBuilder();
        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 < 6; i++) yield return new UnityEngine.WaitForSeconds(1f);

        var g = UnityEngine.Object.FindFirstObjectByType<WL.Look.Farm.WLIslandGrass>(UnityEngine.FindObjectsInactive.Include);
        var cfg = WL.Look.Farm.WLIslandLookSettings.Instance;
        var mat = cfg.cloudEdgeSourceMaterial != null ? cfg.cloudEdgeSourceMaterial : cfg.islandTopMaterial;

        // 실제로 화면에 보이는 섬 윗면 렌더러가 무슨 머티리얼을 쓰는가 (런타임 교체 후)
        var isls = UnityEngine.Object.FindObjectsByType<CryingSnow.FarmingIsland.Island>(UnityEngine.FindObjectsInactive.Exclude, UnityEngine.FindObjectsSortMode.None);
        for (int i = 0; i < isls.Length && i < 3; i++)
        {
            var r = isls[i].GetComponent<UnityEngine.Renderer>();
            L("Island[" + i + "] pos=" + isls[i].transform.position + " mats=" + (r ? Names(r) : "-"));
        }

        var b = g.CalculateInstancesBounds();
        float size = UnityEngine.Mathf.Max(b.size.x, b.size.z) * 0.5f;
        float cx = b.center.x, cz = b.center.z;
        float y = isls.Length > 0 ? isls[0].transform.position.y : b.center.y;
        L("bounds c=" + b.center + " size=" + b.size + " · ortho size=" + size + " · 윗면 y=" + y);

        bool was = g.enabled; g.enabled = false;
        var cam = MakeTop(cx, cz, size);
        var tex = GrabCam(cam, TW, TW);
        g.enabled = was;
        var px = tex.GetPixels32();

        var f = new WL.Look.Farm.WLCloudShadowField();
        if (!f.Configure(mat)) { L("Configure 실패 " + f.Why); Flush(); yield break; }
        L("field: " + f.Dump());
        L("_Time.y(global)=" + UnityEngine.Shader.GetGlobalVector("_Time").y + " timeSinceLevelLoad=" + UnityEngine.Time.timeSinceLevelLoad);

        // 화면 밝기 계단 확인 (초록 픽셀만)
        var hist = new System.Collections.Generic.Dictionary<int, int>();
        for (int i = 0; i < px.Length; i++)
        {
            var p = px[i];
            if (!(p.g > p.b + 12 && p.g > p.r + 8 && p.g > 60)) continue;
            int l = Lum(p); if (!hist.ContainsKey(l)) hist[l] = 0; hist[l]++;
        }
        var keys = new System.Collections.Generic.List<int>(hist.Keys); keys.Sort();
        var top = new System.Collections.Generic.List<string>();
        for (int i = 0; i < keys.Count; i++) if (hist[keys[i]] > 2000) top.Add(keys[i] + "×" + hist[keys[i]]);
        L("초록 밝기 계단(2000픽셀 이상) = " + string.Join(" ", top.ToArray()) + " (고유값 " + keys.Count + ")");

        // 가운데 줄 — 화면 경계 위치 vs CPU 띠 경계 위치 (월드 X)
        for (int r = 0; r < 3; r++)
        {
            int iy = 128 + r * 128;
            float wz = cz + (((iy + 0.5f) / TW) - 0.5f) * 2f * size;
            var scr = new System.Collections.Generic.List<string>();
            var cpu = new System.Collections.Generic.List<string>();
            int prevBand = int.MinValue;
            for (int ix = 1; ix < TW - 1; ix++)
            {
                float wx = cx + (((ix + 0.5f) / TW) - 0.5f) * 2f * size;
                var A = px[iy * TW + ix - 1]; var B = px[iy * TW + ix];
                if (Green(A) && Green(B)) { int d = Lum(B) - Lum(A); if (d < 0) d = -d; if (d >= 6 && d <= 45) scr.Add(wx.ToString("F2")); }
                int bd = f.Band(wx, y, wz);
                if (prevBand != int.MinValue && bd != prevBand) cpu.Add(wx.ToString("F2") + "(" + prevBand + "→" + bd + ")");
                prevBand = bd;
            }
            L("row z=" + wz.ToString("F2") + "  화면경계X=[" + string.Join(" ", scr.ToArray()) + "]");
            L("              CPU경계X=[" + string.Join(" ", cpu.ToArray()) + "]  cloudiness(x=" + cx.ToString("F1") + ")="
              + f.Cloudiness(cx, y, wz).ToString("F4"));
        }

        // 시간 오프셋 스캔 — 가장 잘 맞는 Δt 를 찾는다
        float t0 = f.TimeValue;
        string best = ""; float bestScore = -1f, bestDt = 0f;
        for (float dt = -12f; dt <= 12.01f; dt += 0.5f)
        {
            f.TimeValue = t0 + dt;
            float s = Agree(px, f, cx, cz, size, y);
            if (s > bestScore) { bestScore = s; bestDt = dt; }
            if (System.Math.Abs(dt) < 0.01f) best = "Δt=0 일치율 " + (s * 100f).ToString("F1") + "%";
        }
        f.TimeValue = t0;
        L(best + " · 최적 Δt=" + bestDt.ToString("F1") + " 일치율 " + (bestScore * 100f).ToString("F1") + "%");

        UnityEngine.Object.DestroyImmediate(tex);
        Flush();
    }

    static float Agree(UnityEngine.Color32[] px, WL.Look.Farm.WLCloudShadowField f, float cx, float cz, float size, float y)
    {
        int shown = 0, matched = 0;
        for (int iy = 8; iy < TW - 8; iy += 4)
        {
            float wz = cz + (((iy + 0.5f) / TW) - 0.5f) * 2f * size;
            for (int ix = 2; ix < TW - 3; ix += 2)
            {
                var A = px[iy * TW + ix]; var B = px[iy * TW + ix + 1];
                if (!Green(A) || !Green(B)) continue;
                int d = Lum(B) - Lum(A); if (d < 0) d = -d;
                if (d < 6 || d > 45) continue;
                shown++;
                float w0 = cx + (((ix + 0.5f) / TW) - 0.5f) * 2f * size;
                float w1 = cx + (((ix + 3.5f) / TW) - 0.5f) * 2f * size;
                float wm = cx + (((ix - 1.5f) / TW) - 0.5f) * 2f * size;
                int b0 = f.Band(wm, y, wz), b1 = f.Band(w1, y, wz);
                if (b0 != b1) matched++;
                _ = w0;
            }
        }
        return shown == 0 ? 0f : (float)matched / shown;
    }

    static bool Green(UnityEngine.Color32 p) { return p.g > p.b + 12 && p.g > p.r + 8 && p.g > 60; }
    static int Lum(UnityEngine.Color32 p) { return (p.r * 77 + p.g * 150 + p.b * 29) >> 8; }
    static string Names(UnityEngine.Renderer r)
    { var m = r.sharedMaterials; var s = ""; for (int i = 0; i < m.Length; i++) s += (m[i] ? m[i].name : "-") + " "; return s; }

    static UnityEngine.Camera MakeTop(float cx, float cz, float size)
    {
        var go = UnityEngine.GameObject.Find("~816oTopD");
        if (go == null) go = new UnityEngine.GameObject("~816oTopD");
        var c = go.GetComponent<UnityEngine.Camera>(); if (c == null) c = go.AddComponent<UnityEngine.Camera>();
        c.orthographic = true; c.orthographicSize = size;
        c.nearClipPlane = 0.1f; c.farClipPlane = 200f;
        c.transform.rotation = UnityEngine.Quaternion.Euler(90f, 0f, 0f);
        c.transform.position = new UnityEngine.Vector3(cx, 40f, cz);
        c.enabled = false;
        return c;
    }

    static UnityEngine.Texture2D GrabCam(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);
        System.IO.Directory.CreateDirectory("Screenshots_WL/WL816o");
        System.IO.File.WriteAllBytes("Screenshots_WL/WL816o/diag_top.png", UnityEngine.ImageConversion.EncodeToPNG(tex));
        return tex;
    }

    static void L(string s) { sb.AppendLine(s); }
    static void Flush()
    {
        System.IO.File.WriteAllText("AgentScripts/WL816o_DIAG.txt", sb.ToString());
        UnityEngine.Debug.Log("[816o diag]\n" + sb.ToString());
    }
}