// WL-816n — 데모 풀밭의 「색 경계」가 무엇으로 생기는지 격리 렌더로 가른다. 에디트 모드 전용(데모 Play 금지).
// 원본 에셋 무수정: terrain.materialTemplate 에 복사본을 잠시 물렸다가 원복하고, 씬은 저장하지 않는다.
public static class WL816n_Demo
{
    const int W = 540, H = 960;

    public static void Run()
    {
        var sb = new System.Text.StringBuilder();
        var sc = UnityEditor.SceneManagement.EditorSceneManager.OpenScene(
            "Assets/3DPixelArtEnvironment/Demo/Demo.unity", UnityEditor.SceneManagement.OpenSceneMode.Single);
        sb.AppendLine("=== Demo.unity roots=" + sc.rootCount + " ===");

        var terrain = UnityEngine.Object.FindFirstObjectByType<UnityEngine.Terrain>();
        if (terrain == null) { sb.AppendLine("NO TERRAIN"); Dump(sb); return; }
        var td = terrain.terrainData;
        sb.AppendLine("terrain size=" + td.size + " pos=" + terrain.transform.position
            + " mat=" + (terrain.materialTemplate ? terrain.materialTemplate.name : "null")
            + " alphamapTex=" + td.alphamapTextureCount + " alphamapRes=" + td.alphamapResolution
            + " heightmapRes=" + td.heightmapResolution + " detailProtos=" + td.detailPrototypes.Length);
        // 높이 분포(= 툰 램프 띠의 원천 후보)
        float hmin = 1e9f, hmax = -1e9f;
        for (int i = 0; i <= 32; i++)
            for (int j = 0; j <= 32; j++)
            { var h = td.GetInterpolatedHeight(i / 32f, j / 32f); if (h < hmin) hmin = h; if (h > hmax) hmax = h; }
        sb.AppendLine("terrain height min=" + hmin.ToString("F2") + " max=" + hmax.ToString("F2") + " (월드 y 범위)");

        // 데모 풀 배치 규칙 (ⓓ)
        var tib = terrain.GetComponent<Environment.Instancing.TerrainInstancesBehaviour>();
        if (tib == null) tib = UnityEngine.Object.FindFirstObjectByType<Environment.Instancing.TerrainInstancesBehaviour>();
        if (tib != null)
        {
            sb.AppendLine("--- TerrainInstancesBehaviour (배치 규칙) ---");
            sb.AppendLine(" PositionVariance=" + tib.PositionVariance + " ScaleVariance=" + tib.ScaleVariance);
            DumpLayer(sb, "FirstLayer", tib.FirstLayer);
            DumpLayer(sb, "SecondLayer", tib.SecondLayer);
            DumpLayer(sb, "ThirdLayer", tib.ThirdLayer);
            DumpLayer(sb, "FourthLayer", tib.FourthLayer);
        }
        else sb.AppendLine("TerrainInstancesBehaviour 없음");

        // 카메라 (816f 판정 카메라와 같은 각 · 직교 6)
        var camGo = new UnityEngine.GameObject("~816nCam");
        var cam = camGo.AddComponent<UnityEngine.Camera>();
        cam.orthographic = true; cam.orthographicSize = 6f;
        cam.transform.rotation = UnityEngine.Quaternion.Euler(30f, 60f, 0f);
        var c = terrain.transform.position + td.size * 0.5f; c.y = terrain.transform.position.y + hmax;
        cam.transform.position = c - cam.transform.forward * 40f;
        cam.clearFlags = UnityEngine.CameraClearFlags.SolidColor;
        cam.backgroundColor = new UnityEngine.Color(1f, 0f, 1f, 1f);
        cam.nearClipPlane = 0.1f; cam.farClipPlane = 200f;

        var orig = terrain.materialTemplate;
        var copy = new UnityEngine.Material(orig);
        terrain.materialTemplate = copy;

        sb.AppendLine("--- 격리 렌더 (데모 바닥 · 풀은 에디트 모드에서 안 그려짐) ---");
        Shot(sb, cam, copy, "A_baseline", orig, false, -1);
        Shot(sb, cam, copy, "B_clouds_off", orig, true, -1);
        Shot(sb, cam, copy, "C_shades1", orig, false, 1);
        Shot(sb, cam, copy, "D_clouds_off_shades1", orig, true, 1);

        terrain.materialTemplate = orig;
        UnityEngine.Object.DestroyImmediate(copy);
        UnityEngine.Object.DestroyImmediate(camGo);
        Dump(sb);
    }

    static void DumpLayer(System.Text.StringBuilder sb, string name, Environment.Instancing.TerrainInstancesBehaviour.TerrainInstancingInput v)
    {
        if (v == null) { sb.AppendLine(" " + name + " null"); return; }
        sb.AppendLine(" " + name + " Density=" + v.Density + " settings=" + (v.Settings == null ? 0 : v.Settings.Length));
        if (v.Settings == null) return;
        foreach (var s in v.Settings)
            sb.AppendLine("   mesh=" + (s.Mesh ? s.Mesh.name : "-") + " mat=" + (s.Material ? s.Material.name : "-")
                + " scale=" + s.Scale + " prob=" + s.Probability + " normalOffset=" + s.NormalOffset);
    }

    static void Shot(System.Text.StringBuilder sb, UnityEngine.Camera cam, UnityEngine.Material copy, string tag,
        UnityEngine.Material orig, bool cloudsOff, int shades)
    {
        copy.CopyPropertiesFromMaterial(orig);
        if (cloudsOff) { copy.SetFloat("_Cloud_Strength", 0f); copy.DisableKeyword("_CLOUDSENABLED"); }
        if (shades > 0) copy.SetFloat("_Shades", shades);

        var rt = new UnityEngine.RenderTexture(W, H, 24, UnityEngine.RenderTextureFormat.ARGB32, UnityEngine.RenderTextureReadWrite.sRGB);
        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;

        var px = tex.GetPixels32();
        // 배경(마젠타) 제외한 지형 픽셀만
        var idx = new System.Collections.Generic.List<int>();
        for (int i = 0; i < px.Length; i++)
            if (!(px[i].r > 200 && px[i].g < 60 && px[i].b > 200)) idx.Add(i);
        // 고유색 수 + 에지%(가로 인접 차 > 6)
        var uniq = new System.Collections.Generic.HashSet<int>();
        long sr = 0, sg = 0, sb2 = 0; int edge = 0, cmp = 0;
        foreach (var i in idx)
        {
            uniq.Add((px[i].r << 16) | (px[i].g << 8) | px[i].b);
            sr += px[i].r; sg += px[i].g; sb2 += px[i].b;
            int x = i % W;
            if (x + 1 < W)
            {
                int j = i + 1;
                if (!(px[j].r > 200 && px[j].g < 60 && px[j].b > 200))
                {
                    cmp++;
                    int d = System.Math.Abs(px[i].r - px[j].r) + System.Math.Abs(px[i].g - px[j].g) + System.Math.Abs(px[i].b - px[j].b);
                    if (d > 6) edge++;
                }
            }
        }
        int n = idx.Count == 0 ? 1 : idx.Count;
        sb.AppendLine(string.Format(" {0,-22} 지형px={1} 평균=#{2:X2}{3:X2}{4:X2} 고유색={5} 색경계%={6:F2}",
            tag, idx.Count, sr / n, sg / n, sb2 / n, uniq.Count, cmp == 0 ? 0f : 100f * edge / cmp));

        System.IO.Directory.CreateDirectory("Screenshots_WL/WL816n");
        System.IO.File.WriteAllBytes("Screenshots_WL/WL816n/demo_" + tag + ".png", UnityEngine.ImageConversion.EncodeToPNG(tex));
        UnityEngine.Object.DestroyImmediate(tex);
        rt.Release(); UnityEngine.Object.DestroyImmediate(rt);
    }

    static void Dump(System.Text.StringBuilder sb)
    {
        System.IO.File.WriteAllText("AgentScripts/WL816n_DEMO.txt", sb.ToString());
        UnityEngine.Debug.Log("[816n] demo probe done\n" + sb.ToString());
    }
}