// WL-816e 빌드 — ① 섬 윗면 텍스처·머티리얼(데모 톤) ② 설정 SO ③ 윗면/길 마스크 굽기
// 원본(FarmingIsland · 3DPixelArtEnvironment)은 읽기만 한다.
public static class WL816e_Build
{
    const string kDir = "Assets/WL/Look/Farm/";
    const string kTexPath = kDir + "Textures/WL_IslandTop_Demo.png";
    const string kMatPath = kDir + "Materials/Farm_IslandTop_Demo.mat";
    const string kSoPath = kDir + "Resources/WL/WLIslandLookSettings.asset";

    // 🔴 「데모 지면과 **화면에서 같은 색**이 되는」 값 — 실측으로 역산했다.
    //    데모 ToonTerrain 의 화면 초록(구름 그림자 없는 p95) = #B1E196 = 선형(0.4397, 0.7529, 0.3050)
    //    우리 Shader Graphs/Toon 은 텍스처를 (1.031, 0.889, 0.717) 배로 화면에 낸다(실측)
    //    → 텍스처 초록 = 0.4397/1.031, 0.7529/0.889, 0.3050/0.717 = (0.4265, 0.8469, 0.4254) = #AFEDAE
    static readonly UnityEngine.Color kGrassLin = new UnityEngine.Color(0.4265f, 0.8469f, 0.4254f, 1f);
    // 모래·흙은 데모 Terrain 2층(_GreenHighlight / _GreenShadow)에 같은 감쇠 0.717 을 적용
    static readonly UnityEngine.Color kSandLin = new UnityEngine.Color(0.6020f, 0.5954f, 0.4629f, 1f);
    static readonly UnityEngine.Color kDirtLin = new UnityEngine.Color(0.2165f, 0.1632f, 0.0949f, 1f);
    // 그림자비 = Terrain 의 _RedShadow / _RedHighlight
    static readonly UnityEngine.Color kShadowRatio = new UnityEngine.Color(0.3248f, 0.3416f, 0.3936f, 1f);

    public static void RunTex()
    {
        var sb = new System.Text.StringBuilder();
        Texture(sb);
        Material(sb);
        UnityEditor.AssetDatabase.SaveAssets();
        UnityEngine.Debug.Log(sb.ToString());
    }

    public static void Run()
    {
        var sb = new System.Text.StringBuilder();
        Texture(sb);
        Material(sb);
        Settings(sb);
        UnityEditor.AssetDatabase.SaveAssets();
        UnityEngine.Debug.Log(sb.ToString());
    }

    // ── ① 8×8 텍스처 ──────────────────────────────────────────────────
    static void Texture(System.Text.StringBuilder sb)
    {
        System.IO.Directory.CreateDirectory(kDir + "Textures");
        var t = new UnityEngine.Texture2D(8, 8, UnityEngine.TextureFormat.RGBA32, false, false);
        // 원본 Island01.png 배치: (PNG 행 0 = 위) 위 왼쪽 = 모래 · 위 오른쪽 = 흙/절벽 · 아래 = 초록 2종(체크무늬)
        // Unity 의 y 는 아래가 0 → v<0.5(아래 절반) = 초록.
        for (int y = 0; y < 8; y++)
            for (int x = 0; x < 8; x++)
            {
                UnityEngine.Color c;
                if (y < 4) c = kGrassLin;                 // 초록 두 칸을 **한 색**으로 = 체크무늬 소멸
                else c = (x < 4) ? kSandLin : kDirtLin;
                t.SetPixel(x, y, c.gamma);
            }
        t.Apply();
        System.IO.File.WriteAllBytes(kTexPath, UnityEngine.ImageConversion.EncodeToPNG(t));
        UnityEngine.Object.DestroyImmediate(t);
        UnityEditor.AssetDatabase.ImportAsset(kTexPath, UnityEditor.ImportAssetOptions.ForceUpdate);

        var imp = UnityEditor.AssetImporter.GetAtPath(kTexPath) as UnityEditor.TextureImporter;
        if (imp != null)
        {
            imp.textureType = UnityEditor.TextureImporterType.Default;
            imp.sRGBTexture = true;
            imp.filterMode = UnityEngine.FilterMode.Point;
            imp.wrapMode = UnityEngine.TextureWrapMode.Clamp;
            imp.mipmapEnabled = false;
            imp.npotScale = UnityEditor.TextureImporterNPOTScale.None;
            imp.textureCompression = UnityEditor.TextureImporterCompression.Uncompressed;
            imp.maxTextureSize = 32;
            imp.SaveAndReimport();
        }
        sb.AppendLine("텍스처 " + kTexPath + " — 초록 " + Hex(kGrassLin) + " · 모래 " + Hex(kSandLin) + " · 흙 " + Hex(kDirtLin));
    }

    static string Hex(UnityEngine.Color lin)
    {
        var g = lin.gamma;
        return "#" + UnityEngine.ColorUtility.ToHtmlStringRGB(g);
    }

    // ── ② 머티리얼 ────────────────────────────────────────────────────
    static void Material(System.Text.StringBuilder sb)
    {
        var src = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Material>(kDir + "Materials/Farm_Island01_ToonTex.mat");
        if (src == null) { sb.AppendLine("🔴 816a 의 Farm_Island01_ToonTex.mat 이 없다"); return; }
        var tex = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Texture2D>(kTexPath);

        var m = UnityEngine.Object.Instantiate(src);
        m.name = "Farm_IslandTop_Demo";
        if (m.HasProperty("_BaseMap")) m.SetTexture("_BaseMap", tex);
        if (m.HasProperty("_ShadowBaseMap")) m.SetTexture("_ShadowBaseMap", tex);
        if (m.HasProperty("_DiffuseColor")) m.SetColor("_DiffuseColor", UnityEngine.Color.white);
        if (m.HasProperty("_ShadowDiffuseColor")) m.SetColor("_ShadowDiffuseColor", kShadowRatio);

        var old = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Material>(kMatPath);
        if (old != null) { old.CopyPropertiesFromMaterial(m); UnityEngine.Object.DestroyImmediate(m); UnityEditor.EditorUtility.SetDirty(old); }
        else UnityEditor.AssetDatabase.CreateAsset(m, kMatPath);
        sb.AppendLine("머티리얼 " + kMatPath + " (shader " + src.shader.name + " · _ShadowDiffuseColor " + kShadowRatio.ToString("F4") + ")");
    }

    // ── ③ 설정 SO + 마스크 ────────────────────────────────────────────
    static void Settings(System.Text.StringBuilder sb)
    {
        System.IO.Directory.CreateDirectory(kDir + "Resources/WL");
        UnityEditor.AssetDatabase.Refresh();

        // 🔴 마스크를 **먼저** 굽는다 — Bake 가 씬을 열면 AssetDatabase 가 재로드돼
        //    앞서 잡아 둔 SO 참조가 끊긴다(MissingReferenceException). 구운 뒤에 SO 를 잡는다.
        var bakedTiles = new System.Collections.Generic.List<WL.Look.Farm.WLTileMask>();
        var bakedRoads = new System.Collections.Generic.List<WL.Look.Farm.WLTileMask>();
        Bake(bakedTiles, bakedRoads, sb);

        var so = UnityEditor.AssetDatabase.LoadAssetAtPath<WL.Look.Farm.WLIslandLookSettings>(kSoPath);
        if (so == null)
        {
            so = UnityEngine.ScriptableObject.CreateInstance<WL.Look.Farm.WLIslandLookSettings>();
            UnityEditor.AssetDatabase.CreateAsset(so, kSoPath);
            UnityEditor.AssetDatabase.SaveAssets();
            so = UnityEditor.AssetDatabase.LoadAssetAtPath<WL.Look.Farm.WLIslandLookSettings>(kSoPath);
        }
        so.tileMasks = bakedTiles.ToArray();
        so.roadMasks = bakedRoads.ToArray();

        // 머티리얼 교체 표
        var remap = new System.Collections.Generic.List<WL.Look.Farm.WLMatRemap>();
        string[,] pairs = {
            { "Assets/FarmingIsland/Materials/Palette.mat",                  kDir + "Materials/Farm_Palette_ToonTex.mat" },
            { "Assets/FarmingIsland/Materials/Islands/Island01.mat",         kDir + "Materials/Farm_IslandTop_Demo.mat" },
            { "Assets/FarmingIsland/Materials/Islands/Road01.mat",           kDir + "Materials/Farm_Road01_ToonTex.mat" },
            { "Assets/FarmingIsland/Materials/Skins/Skin_Purple.mat",        kDir + "Materials/Farm_Skin_Purple_ToonTex.mat" },
            { "Assets/FarmingIsland/Materials/Skins/Skin_Yellow.mat",        kDir + "Materials/Farm_Skin_Yellow_ToonTex.mat" },
            { "Assets/FarmingIsland/Materials/Environments/SimpleWater.mat", kDir + "Materials/Farm_SimpleWater_Demo.mat" },
        };
        for (int i = 0; i < pairs.GetLength(0); i++)
        {
            var a = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Material>(pairs[i, 0]);
            var b = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Material>(pairs[i, 1]);
            if (a == null || b == null) { sb.AppendLine("🔴 remap 실패 " + pairs[i, 0] + " → " + pairs[i, 1]); continue; }
            remap.Add(new WL.Look.Farm.WLMatRemap { enabled_ = 1, from = a, to = b });
        }
        so.materialRemap = remap.ToArray();
        so.islandTopMaterial = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Material>(kMatPath);
        so.skybox = UnityEditor.AssetDatabase.GetBuiltinExtraResource<UnityEngine.Material>("Default-Skybox.mat");

        // 흩뿌릴 것 — 데모 실측값 그대로
        var grassMesh = FindMesh("Assets/3DPixelArtEnvironment/Meshes/Instanced/Grass_Leaf.fbx", "Grass_Leaf");
        var flowerMesh = FindMesh("Assets/3DPixelArtEnvironment/Meshes/Instanced/Flower_Leaf.fbx", "Flower_Leaf");
        var stoneMesh = FindMeshByName("Stone_1");
        var mGrass = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Material>("Assets/3DPixelArtEnvironment/Materials/Instanced_Grass.mat");
        var mFlower = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Material>("Assets/3DPixelArtEnvironment/Materials/Instanced_Flower.mat");
        var mGravel = UnityEditor.AssetDatabase.LoadAssetAtPath<UnityEngine.Material>("Assets/3DPixelArtEnvironment/Materials/Instanced_Gravel.mat");

        var sc = new System.Collections.Generic.List<WL.Look.Farm.WLScatterDef>();
        sc.Add(new WL.Look.Farm.WLScatterDef { label = "풀", mesh = grassMesh, material = mGrass, probability = 100f, scale = 0.35f, normalOffset = 0.04f, density = 2.5f });
        sc.Add(new WL.Look.Farm.WLScatterDef { label = "꽃", mesh = flowerMesh, material = mFlower, probability = 1f, scale = 0.35f, normalOffset = 0.04f, density = 2.5f });
        sc.Add(new WL.Look.Farm.WLScatterDef { label = "자갈", mesh = stoneMesh, material = mGravel, probability = 1f, scale = 0.7f, normalOffset = 0.1f, density = 0.05f });
        so.scatter = sc.ToArray();
        sb.AppendLine("scatter — 풀 " + (grassMesh == null ? "메시없음" : grassMesh.name) +
                      " · 꽃 " + (flowerMesh == null ? "메시없음" : flowerMesh.name) +
                      " · 자갈 " + (stoneMesh == null ? "메시없음" : stoneMesh.name));

        UnityEditor.EditorUtility.SetDirty(so);
        sb.AppendLine("SO " + kSoPath + " — remap " + so.materialRemap.Length +
                      " · tileMasks " + so.tileMasks.Length + " · roadMasks " + so.roadMasks.Length);
    }

    static UnityEngine.Mesh FindMesh(string path, string name)
    {
        var all = UnityEditor.AssetDatabase.LoadAllAssetsAtPath(path);
        for (int i = 0; i < all.Length; i++)
        {
            var m = all[i] as UnityEngine.Mesh;
            if (m != null) return m;
        }
        return null;
    }

    static UnityEngine.Mesh FindMeshByName(string name)
    {
        var guids = UnityEditor.AssetDatabase.FindAssets(name + " t:Mesh");
        for (int i = 0; i < guids.Length; i++)
        {
            var p = UnityEditor.AssetDatabase.GUIDToAssetPath(guids[i]);
            var all = UnityEditor.AssetDatabase.LoadAllAssetsAtPath(p);
            for (int k = 0; k < all.Length; k++)
            {
                var m = all[k] as UnityEngine.Mesh;
                if (m != null && m.name == name) return m;
            }
        }
        // 데모 씬의 인스턴싱 설정에서 직접 집는다
        return null;
    }

    // ── 마스크 굽기 ───────────────────────────────────────────────────
    public static void Bake(System.Collections.Generic.List<WL.Look.Farm.WLTileMask> tiles,
                            System.Collections.Generic.List<WL.Look.Farm.WLTileMask> roads,
                            System.Text.StringBuilder sb)
    {
        var prev = UnityEditor.SceneManagement.EditorSceneManager.GetActiveScene().path;
        UnityEditor.SceneManagement.EditorSceneManager.OpenScene("Assets/FarmingIsland/Scenes/Level01.unity",
            UnityEditor.SceneManagement.OpenSceneMode.Single);
        var mgr = UnityEngine.Object.FindFirstObjectByType<CryingSnow.FarmingIsland.IslandManager>(UnityEngine.FindObjectsInactive.Include);
        var t = typeof(CryingSnow.FarmingIsland.IslandManager);
        var islMeshes = t.GetField("islandMeshes", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)
                         .GetValue(mgr) as System.Collections.Generic.List<UnityEngine.Mesh>;
        var roadMeshes = t.GetField("roadMeshes", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)
                          .GetValue(mgr) as System.Collections.Generic.List<UnityEngine.Mesh>;

        int res = 64;

        for (int i = 0; islMeshes != null && i < islMeshes.Count; i++)
        {
            var m = islMeshes[i];
            if (m == null) continue;
            if (m.name == "Bridge") continue;                       // 다리에는 안 깐다
            var mask = Rasterize(m, res, 4f, true, out int on);
            mask.meshName = m.name;
            tiles.Add(mask);
            if (i <= 1 || i == 46 || i == 47)
                sb.AppendLine("  마스크 isl[" + i + "] " + m.name + " 초록칸 " + on + "/" + (res * res)
                              + " (" + (on * 64f / (res * res)).ToString("F1") + "㎡)");
        }
        for (int i = 0; roadMeshes != null && i < roadMeshes.Count; i++)
        {
            var m = roadMeshes[i];
            if (m == null) continue;
            var mask = Rasterize(m, res, 4f, false, out int on);
            mask.meshName = m.name;
            roads.Add(mask);
        }
        if (!string.IsNullOrEmpty(prev)) UnityEditor.SceneManagement.EditorSceneManager.OpenScene(prev, UnityEditor.SceneManagement.OpenSceneMode.Single);
    }

    /// <summary>
    /// 메시의 **윗면**(법선 +Y · 최상단)을 XZ 격자에 굽는다.
    /// greenOnly = true 면 **UV 가 Island01.png 의 초록 사분면(v &lt; 0.5)** 인 삼각형만 센다
    /// = FI 가 「여기는 잔디」라고 표시한 자리. 모래 해변·흙 절벽에는 풀을 안 깐다.
    /// </summary>
    static WL.Look.Farm.WLTileMask Rasterize(UnityEngine.Mesh m, int res, float half, bool greenOnly, out int onCells)
    {
        var mask = new WL.Look.Farm.WLTileMask { res = res, half = half, bits = new byte[(res * res + 7) / 8] };
        var v = m.vertices; var tri = m.triangles; var uv = m.uv;
        float maxY = -99999f;
        for (int i = 0; i < v.Length; i++) if (v[i].y > maxY) maxY = v[i].y;

        float cell = half * 2f / res;
        onCells = 0;
        for (int i = 0; i + 2 < tri.Length; i += 3)
        {
            int i0 = tri[i], i1 = tri[i + 1], i2 = tri[i + 2];
            var a = v[i0]; var b = v[i1]; var c = v[i2];
            var n = UnityEngine.Vector3.Cross(b - a, c - a);
            if (n.y <= 0f) continue;
            if ((a.y + b.y + c.y) / 3f < maxY - 0.05f) continue;
            if (greenOnly && uv != null && uv.Length > i2)
            {
                float vv = (uv[i0].y + uv[i1].y + uv[i2].y) / 3f;
                if (vv >= 0.5f) continue;                       // 모래(위 왼쪽)·흙(위 오른쪽) = 잔디 아님
            }

            float minx = UnityEngine.Mathf.Min(a.x, UnityEngine.Mathf.Min(b.x, c.x));
            float maxx = UnityEngine.Mathf.Max(a.x, UnityEngine.Mathf.Max(b.x, c.x));
            float minz = UnityEngine.Mathf.Min(a.z, UnityEngine.Mathf.Min(b.z, c.z));
            float maxz = UnityEngine.Mathf.Max(a.z, UnityEngine.Mathf.Max(b.z, c.z));
            int cx0 = UnityEngine.Mathf.Max(0, UnityEngine.Mathf.FloorToInt((minx + half) / cell));
            int cx1 = UnityEngine.Mathf.Min(res - 1, UnityEngine.Mathf.CeilToInt((maxx + half) / cell));
            int cz0 = UnityEngine.Mathf.Max(0, UnityEngine.Mathf.FloorToInt((minz + half) / cell));
            int cz1 = UnityEngine.Mathf.Min(res - 1, UnityEngine.Mathf.CeilToInt((maxz + half) / cell));

            for (int cx = cx0; cx <= cx1; cx++)
                for (int cz = cz0; cz <= cz1; cz++)
                {
                    float px = -half + (cx + 0.5f) * cell;
                    float pz = -half + (cz + 0.5f) * cell;
                    float d1 = (px - b.x) * (a.z - b.z) - (a.x - b.x) * (pz - b.z);
                    float d2 = (px - c.x) * (b.z - c.z) - (b.x - c.x) * (pz - c.z);
                    float d3 = (px - a.x) * (c.z - a.z) - (c.x - a.x) * (pz - a.z);
                    bool neg = (d1 < 0) || (d2 < 0) || (d3 < 0);
                    bool pos = (d1 > 0) || (d2 > 0) || (d3 > 0);
                    if (neg && pos) continue;
                    if (!mask.At(px, pz)) onCells++;
                    mask.Set(cx, cz, true);
                }
        }
        return mask;
    }

    // ── 마스크 눈으로 확인 ────────────────────────────────────────────
    public static void Show()
    {
        var so = UnityEditor.AssetDatabase.LoadAssetAtPath<WL.Look.Farm.WLIslandLookSettings>(kSoPath);
        var sb = new System.Text.StringBuilder();
        string[] want = { "47", "46", "33", "01" };
        for (int w = 0; w < want.Length; w++)
        {
            var m = so.FindTileMask(want[w]);
            if (m == null) { sb.AppendLine("마스크 없음 " + want[w]); continue; }
            sb.AppendLine("--- TILE " + want[w] + " ---");
            for (int r = 31; r >= 0; r--)
            {
                var line = new System.Text.StringBuilder("  ");
                for (int c = 0; c < 32; c++)
                    line.Append(m.At(-4f + (c + 0.5f) * 0.25f, -4f + (r + 0.5f) * 0.25f) ? '#' : '.');
                sb.AppendLine(line.ToString());
            }
        }
        var rm = so.FindRoadMask("15");
        if (rm != null)
        {
            sb.AppendLine("--- ROAD 15 ---");
            for (int r = 31; r >= 0; r--)
            {
                var line = new System.Text.StringBuilder("  ");
                for (int c = 0; c < 32; c++)
                    line.Append(rm.At(-4f + (c + 0.5f) * 0.25f, -4f + (r + 0.5f) * 0.25f) ? '#' : '.');
                sb.AppendLine(line.ToString());
            }
        }
        UnityEngine.Debug.Log(sb.ToString());
    }
}