// WL-816r 3차 — 같은 프레임 안에서 「띠 / 초록바닥」 비를 재서 데모의 「흙 / 풀」 비에 맞춘다.
// 구름이 흘러 밝기가 변해도 같은 프레임의 비는 흔들리지 않는다(816q 교훈).
public static class WL816r_Play3
{
    public static void Start()
    {
        var go = UnityEngine.GameObject.Find("~WL816rPlay3");
        if (go != null) UnityEngine.Object.DestroyImmediate(go);
        go = new UnityEngine.GameObject("~WL816rPlay3");
        go.AddComponent<WL816r_Runner3>();
    }
}

public class WL816r_Runner3 : UnityEngine.MonoBehaviour
{
    static System.Text.StringBuilder sb;
    const int W = 1080, H = 1920;
    static string Dir = "Screenshots_WL/WL816r";

    // 데모 실측: 흙 #A4A88B(164,168,139) / 풀 #97C284(151,194,132) → 비
    static readonly float[] TargetRatio = { 164f / 151f, 168f / 194f, 139f / 132f };

    static readonly string[][] Cand = {
        new[]{"CCCBB5","807057"},   // 0 현행
        new[]{"96B39C","708D76"},
        new[]{"A2BCA4","7C967E"},
        new[]{"AEC4AC","88A086"},
        new[]{"BACCB4","94A88E"},
        new[]{"8AA894","648276"},
    };

    void Start() { StartCoroutine(Co()); }

    System.Collections.IEnumerator Co()
    {
        sb = new System.Text.StringBuilder();
        System.IO.Directory.CreateDirectory(Dir);
        L("데모 목표비 흙/풀 = " + TargetRatio[0].ToString("F4") + "," + TargetRatio[1].ToString("F4") + "," + TargetRatio[2].ToString("F4"));

        var cfg = WL.Look.Farm.WLIslandLookSettings.Instance;
        var topMat = cfg.islandTopMaterial;
        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 == topMat) { topR.Add(r); break; }

        var cam = MakePd();
        var mask = IdMask(cam, W, H, topR);

        // 초록/띠 분류는 「현행」 프레임 한 번으로 고정한다
        var t0 = Grab(cam, W, H);
        var p0 = t0.GetPixels32();
        var kind = new byte[W * H];
        int ng = 0, nb = 0;
        for (int i = 0; i < mask.Length; i++)
        {
            if (mask[i] != 1) continue;
            var p = p0[i];
            if (p.g > p.r + 20 && p.g > p.b + 20) { kind[i] = 1; ng++; }     // 초록 바닥
            else if (p.r > 150) { kind[i] = 2; nb++; }                       // 🔴 평평한 윗면 띠만(수직 절벽 제외)
        }
        L("초록px=" + ng + " 윗면띠px=" + nb);
        UnityEngine.Object.DestroyImmediate(t0);

        var srcBytes = System.IO.File.ReadAllBytes("Assets/WL/Look/Farm/Textures/WL_IslandTop_Demo.png");
        for (int ci = 0; ci < Cand.Length; ci++)
        {
            UnityEngine.Material m = null; UnityEngine.Texture2D tex = null;
            if (ci > 0)
            {
                tex = MakeTopTex(srcBytes, Cand[ci][0], Cand[ci][1]);
                m = new UnityEngine.Material(topMat); m.name = topMat.name + "_c" + ci;
                m.SetTexture("_BaseMap", tex); m.SetTexture("_ShadowBaseMap", tex);
                SwapMat(topR, topMat, m);
                yield return null; yield return null;
            }
            var t = Grab(cam, W, H);
            var px = t.GetPixels32();
            var g = Avg(px, kind, 1);
            var b = Avg(px, kind, 2);
            float[] ratio = { b[0] / UnityEngine.Mathf.Max(1f, g[0]), b[1] / UnityEngine.Mathf.Max(1f, g[1]), b[2] / UnityEngine.Mathf.Max(1f, g[2]) };
            float err = UnityEngine.Mathf.Abs(ratio[0] - TargetRatio[0]) + UnityEngine.Mathf.Abs(ratio[1] - TargetRatio[1]) + UnityEngine.Mathf.Abs(ratio[2] - TargetRatio[2]);
            L(string.Format("[{0}] 모래#{1} 흙#{2} | 초록={3} 띠={4} | 비={5:F4},{6:F4},{7:F4} | 오차={8:F4}",
                ci, Cand[ci][0], Cand[ci][1], Hx(g), Hx(b), ratio[0], ratio[1], ratio[2], err));
            if (ci == 0) System.IO.File.WriteAllBytes(Dir + "/r3_before.png", UnityEngine.ImageConversion.EncodeToPNG(t));
            System.IO.File.WriteAllBytes(Dir + "/r3_c" + ci + ".png", UnityEngine.ImageConversion.EncodeToPNG(t));
            UnityEngine.Object.DestroyImmediate(t);
            if (ci > 0) { SwapMat(topR, m, topMat); UnityEngine.Object.DestroyImmediate(m); UnityEngine.Object.DestroyImmediate(tex); }
        }
        Flush();
    }

    static float[] Avg(UnityEngine.Color32[] px, byte[] kind, byte id)
    {
        double r = 0, g = 0, b = 0; int n = 0;
        for (int i = 0; i < kind.Length && i < px.Length; i++)
        {
            if (kind[i] != id) continue;
            r += px[i].r; g += px[i].g; b += px[i].b; n++;
        }
        if (n == 0) return new float[] { 1, 1, 1 };
        return new float[] { (float)(r / n), (float)(g / n), (float)(b / n) };
    }
    static string Hx(float[] c) { return string.Format("#{0:X2}{1:X2}{2:X2}", (int)c[0], (int)c[1], (int)c[2]); }

    static UnityEngine.Texture2D MakeTopTex(byte[] srcBytes, string sandHex, string dirtHex)
    {
        var tex = new UnityEngine.Texture2D(2, 2, UnityEngine.TextureFormat.RGBA32, false);
        UnityEngine.ImageConversion.LoadImage(tex, srcBytes);
        tex.filterMode = UnityEngine.FilterMode.Point; tex.wrapMode = UnityEngine.TextureWrapMode.Clamp;
        var px = tex.GetPixels32();
        var sand = Hex32c(sandHex); var dirt = Hex32c(dirtHex);
        var sandSrc = new UnityEngine.Color32(0xCC, 0xCB, 0xB5, 255);
        var dirtSrc = new UnityEngine.Color32(0x80, 0x70, 0x57, 255);
        for (int i = 0; i < px.Length; i++)
        {
            if (px[i].r == sandSrc.r && px[i].g == sandSrc.g && px[i].b == sandSrc.b) px[i] = sand;
            else if (px[i].r == dirtSrc.r && px[i].g == dirtSrc.g && px[i].b == dirtSrc.b) px[i] = dirt;
        }
        tex.SetPixels32(px); tex.Apply(false);
        return tex;
    }
    static UnityEngine.Color32 Hex32c(string h)
    {
        return new UnityEngine.Color32((byte)System.Convert.ToInt32(h.Substring(0, 2), 16),
                                       (byte)System.Convert.ToInt32(h.Substring(2, 2), 16),
                                       (byte)System.Convert.ToInt32(h.Substring(4, 2), 16), 255);
    }
    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 byte[] IdMask(UnityEngine.Camera cam, int w, int h, System.Collections.Generic.List<UnityEngine.Renderer> top)
    {
        var unlit = UnityEngine.Shader.Find("Universal Render Pipeline/Unlit");
        var saved = new System.Collections.Generic.Dictionary<UnityEngine.Renderer, UnityEngine.Material[]>();
        var black = new UnityEngine.Material(unlit); black.SetColor("_BaseColor", UnityEngine.Color.black);
        var blue = new UnityEngine.Material(unlit); blue.SetColor("_BaseColor", new UnityEngine.Color(0f, 0f, 1f, 1f));
        foreach (var r in UnityEngine.Object.FindObjectsByType<UnityEngine.Renderer>(UnityEngine.FindObjectsSortMode.None))
        {
            if (r == null || !r.enabled) continue;
            var use = top.Contains(r) ? blue : black;
            saved[r] = r.sharedMaterials;
            var arr = new UnityEngine.Material[r.sharedMaterials.Length];
            for (int i = 0; i < arr.Length; i++) arr[i] = use;
            r.sharedMaterials = arr;
        }
        var tex = Grab(cam, w, h);
        var px = tex.GetPixels32();
        var mask = new byte[w * h];
        for (int i = 0; i < px.Length; i++) if (px[i].b > 150 && px[i].r < 90 && px[i].g < 90) mask[i] = 1;
        UnityEngine.Object.DestroyImmediate(tex);
        foreach (var kv in saved) if (kv.Key != null) kv.Key.sharedMaterials = kv.Value;
        UnityEngine.Object.DestroyImmediate(black); UnityEngine.Object.DestroyImmediate(blue);
        return mask;
    }
    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("~816r3Pd"); if (go == null) go = new UnityEngine.GameObject("~816r3Pd");
        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_PLAY3.txt", sb.ToString());
        UnityEngine.Debug.Log("[816r play3]\n" + sb.ToString());
    }
}