// WL-816j2 — ④ PD 구도에서 마지막 조율: 무늬 선을 데모만큼 은은하게 · 띠 폭/비용 · 최종 전후
using System.Collections;
using System.Text;
using UnityEngine;
using UnityEngine.Rendering.Universal;
using WL.Look.Farm;

public static class WL816j2_Tune
{
    public const string D = "Screenshots_WL/WL816j2/";
    public const int PW = 1280, PH = 720;
    public const string C_Light = "Color_1ec6cccf8ead489ebb917674f7e8b3b1";
    public const string C_FoamShadow = "Color_2323d69962e04c499c5d5f0925432b55";

    public static void Start()
    {
        var go = GameObject.Find("~WL816j2T");
        if (go != null) Object.DestroyImmediate(go);
        go = new GameObject("~WL816j2T");
        go.AddComponent<WL816j2_TuneRunner>();
    }
    public static string Shot(Camera cam, string path)
    {
        System.IO.Directory.CreateDirectory(System.IO.Path.GetDirectoryName(path));
        var rt = new RenderTexture(PW, PH, 24, RenderTextureFormat.ARGB32, RenderTextureReadWrite.sRGB);
        rt.antiAliasing = 1; rt.Create();
        var pT = cam.targetTexture; var pA = RenderTexture.active;
        cam.targetTexture = rt; cam.Render(); RenderTexture.active = rt;
        var t = new Texture2D(PW, PH, TextureFormat.RGB24, false);
        t.ReadPixels(new Rect(0, 0, PW, PH), 0, 0); t.Apply();
        RenderTexture.active = pA; cam.targetTexture = pT; rt.Release(); Object.DestroyImmediate(rt);
        System.IO.File.WriteAllBytes(path, t.EncodeToPNG());
        var px = t.GetPixels32();
        double sum = 0, sum2 = 0; int n = 0;
        for (int y = 20; y < 320; y += 2)
            for (int x = 20; x < 340; x += 2)
            { var c = px[y * PW + x]; float l = (0.299f * c.r + 0.587f * c.g + 0.114f * c.b) / 255f; sum += l; sum2 += l * l; n++; }
        double mean = sum / n, sd = System.Math.Sqrt(System.Math.Max(0, sum2 / n - mean * mean));
        long fr = 0, fg = 0, fb = 0; int fn = 0, tot = 0;
        int y1 = (int)(PH * 0.55f);
        for (int y = 0; y < y1; y++)
            for (int x = 0; x < PW; x += 2)
            { var c = px[y * PW + x]; tot++; if (c.r > 200 && c.g > 195 && c.b > 195) { fr += c.r; fg += c.g; fb += c.b; fn++; } }
        Object.DestroyImmediate(t);
        string foam = fn == 0 ? "거품 0%" : "거품 " + (100f * fn / tot).ToString("F2") + "% #"
            + ((int)(fr / fn)).ToString("X2") + ((int)(fg / fn)).ToString("X2") + ((int)(fb / fn)).ToString("X2")
            + "(R−B " + ((int)(fr / fn) - (int)(fb / fn)) + ")";
        return "σ=" + sd.ToString("F4") + " · " + foam + " → " + path;
    }
    public static float Ms(Camera cam, int frames)
    {
        var rt = new RenderTexture(PW, PH, 24, RenderTextureFormat.ARGB32, RenderTextureReadWrite.sRGB);
        rt.antiAliasing = 1; rt.Create();
        var pT = cam.targetTexture; cam.targetTexture = rt;
        for (int i = 0; i < 10; i++) cam.Render();
        var sw = System.Diagnostics.Stopwatch.StartNew();
        for (int i = 0; i < frames; i++) cam.Render();
        sw.Stop();
        cam.targetTexture = pT; rt.Release(); Object.DestroyImmediate(rt);
        return (float)sw.Elapsed.TotalMilliseconds / frames;
    }
    public static void Strip(string[] paths, string outPath)
    {
        var ts = new Texture2D[paths.Length]; int w = 0, h = 0;
        for (int i = 0; i < paths.Length; i++)
        {
            if (!System.IO.File.Exists(paths[i])) return;
            ts[i] = new Texture2D(2, 2, TextureFormat.RGB24, false);
            ts[i].LoadImage(System.IO.File.ReadAllBytes(paths[i]));
            w = Mathf.Max(w, ts[i].width); h += ts[i].height;
        }
        var o = new Texture2D(w, h, TextureFormat.RGB24, false);
        var f = new Color32[w * h];
        for (int i = 0; i < f.Length; i++) f[i] = new Color32(24, 24, 28, 255);
        o.SetPixels32(f);
        int y = h;
        for (int i = 0; i < ts.Length; i++) { y -= ts[i].height; o.SetPixels32(0, y, ts[i].width, ts[i].height, ts[i].GetPixels32()); }
        o.Apply();
        System.IO.File.WriteAllBytes(outPath, o.EncodeToPNG());
        Object.DestroyImmediate(o);
        for (int i = 0; i < ts.Length; i++) Object.DestroyImmediate(ts[i]);
    }
}

public class WL816j2_TuneRunner : MonoBehaviour
{
    static StringBuilder sb;
    static void L(string s) { sb.AppendLine(s); }
    const string D = WL816j2_Tune.D;
    const string MatDir = "Assets/WL/Look/Farm/Materials/";

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

    IEnumerator Co()
    {
        sb = new StringBuilder();
        L("=== WL-816j2 ④ 마지막 조율 (PD 구도 1280×720) ===");
        Renderer water = null;
        foreach (var r in Object.FindObjectsByType<Renderer>(FindObjectsInactive.Exclude, FindObjectsSortMode.None))
            if (r != null && r.gameObject.scene.name == "Level01" && r.name == "Water") water = r;
        Camera live = null;
        foreach (var c in Object.FindObjectsByType<Camera>(FindObjectsInactive.Exclude, FindObjectsSortMode.None))
        {
            if (!c.gameObject.activeInHierarchy || !c.enabled || c.targetTexture != null) continue;
            if (c.name.StartsWith("~WL816")) continue;
            if (live == null || c.depth > live.depth) live = c;
        }
        var foam = Object.FindFirstObjectByType<WLShoreFoam>(FindObjectsInactive.Include);
        if (water == null || live == null || foam == null) { L("🔴 없음"); Done(); yield break; }
        var E = UnityEditor.AssetDatabase.LoadAssetAtPath<Material>(MatDir + "Farm_Water_WL_E.mat");
        var mr = foam.GetComponent<MeshRenderer>();

        // ── 1) 무늬 선을 데모만큼 은은하게 (기준 데모 σ=0.0024 · 지금 D σ=0.0823) ──
        L("");
        L("1) 무늬 선 3단 — LightColor + FoamShadowColor(무늬의 어두운 쪽). 목표 = 데모(σ 0.0024)에 가깝게");
        var lc = new[] { new Color(0.45f, 0.74f, 0.86f), new Color(0.42f, 0.72f, 0.845f), new Color(0.385f, 0.705f, 0.83f) };
        var fs = new[] { new Color(0.78f, 0.86f, 0.92f), new Color(0.93f, 0.96f, 0.98f), new Color(1f, 1f, 1f) };
        var ps = new string[3];
        for (int i = 0; i < 3; i++)
        {
            var m = new Material(E);
            m.SetColor(WL816j2_Tune.C_Light, lc[i]);
            m.SetColor(WL816j2_Tune.C_FoamShadow, fs[i]);
            water.sharedMaterial = m; yield return null; yield return new WaitForSeconds(0.2f);
            ps[i] = D + "h_soft" + (i + 1) + ".png";
            L("   Light " + lc[i] + " Shadow " + fs[i] + " " + WL816j2_Tune.Shot(live, ps[i]));
        }
        WL816j2_Tune.Strip(ps, D + "h_soft_steps.png");

        // 채택 후보 = 가운데
        var adopt = new Material(E);
        adopt.SetColor(WL816j2_Tune.C_Light, lc[1]);
        adopt.SetColor(WL816j2_Tune.C_FoamShadow, fs[1]);
        water.sharedMaterial = adopt; yield return null;

        // ── 2) 띠 폭 3단 (고친 텍스처로 다시) + 폭별 비용 ────────────
        L("");
        L("2) 띠 폭 3단 + 폭별 비용 (60프레임 × 2회)");
        var ws = new string[4]; float[] wid = { 0.9f, 1.6f, 2.6f };
        mr.enabled = false; yield return null; yield return null;
        ws[0] = D + "i_w0_off.png";
        L("   [띠 off] " + WL816j2_Tune.Shot(live, ws[0]) + " · " + WL816j2_Tune.Ms(live, 60).ToString("F3") + " ms");
        mr.enabled = true;
        for (int i = 0; i < 3; i++)
        {
            foam.widthOverride = wid[i]; foam.Rebuild();
            yield return null; yield return new WaitForSeconds(0.2f);
            ws[i + 1] = D + "i_w" + (i + 1) + ".png";
            float a = WL816j2_Tune.Ms(live, 60), b = WL816j2_Tune.Ms(live, 60);
            L("   [폭 " + wid[i] + " m · 삼각형 " + WLShoreFoam.Tris + "] " + WL816j2_Tune.Shot(live, ws[i + 1])
              + " · " + a.ToString("F3") + " / " + b.ToString("F3") + " ms");
        }
        WL816j2_Tune.Strip(ws, D + "i_band_steps.png");
        foam.widthOverride = 0f; foam.Rebuild(); yield return null;

        // ── 3) 최종 전/후 (PD 구도) ─────────────────────────────────
        var Dm = UnityEditor.AssetDatabase.LoadAssetAtPath<Material>(MatDir + "Farm_Water_WL_D.mat");
        L("");
        L("3) 최종 전/후 (PD 구도)");
        mr.enabled = false; water.sharedMaterial = Dm; yield return null; yield return new WaitForSeconds(0.3f);
        L("   [전] main(물 D · 띠 없음) " + WL816j2_Tune.Shot(live, D + "z_before_pd.png"));
        mr.enabled = true; water.sharedMaterial = adopt; yield return null; yield return new WaitForSeconds(0.3f);
        L("   [후] 816j2(물 E · 띠 on) " + WL816j2_Tune.Shot(live, D + "z_after_pd.png"));
        WL816j2_Tune.Strip(new[] { D + "z_before_pd.png", D + "z_after_pd.png" }, D + "z_pd_before_after.png");

        Done();
    }
    void Done()
    {
        System.IO.File.WriteAllText("AgentScripts/WL816j2_TUNE.txt", sb.ToString());
        Debug.Log("[816j2 tune]\n" + sb);
    }
}