// WL-816j2 — ③ 띠가 왜 안 보이나 (실측) · 물보다 뒤에 그려지는지 · 알파가 살아 있는지
using System.Collections;
using System.Text;
using UnityEngine;
using UnityEngine.Rendering.Universal;
using WL.Look.Farm;

public static class WL816j2_Diag
{
    public const string D = "Screenshots_WL/WL816j2/";
    public static void Start()
    {
        var go = GameObject.Find("~WL816j2D");
        if (go != null) Object.DestroyImmediate(go);
        go = new GameObject("~WL816j2D");
        go.AddComponent<WL816j2_DiagRunner>();
    }
}

public class WL816j2_DiagRunner : MonoBehaviour
{
    static StringBuilder sb;
    static void L(string s) { sb.AppendLine(s); }
    const string D = WL816j2_Diag.D;
    const int PW = 1280, PH = 720;

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

    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();
        int white = 0;
        for (int i = 0; i < px.Length; i += 3) if (px[i].r > 205 && px[i].g > 200 && px[i].b > 200) white++;
        Object.DestroyImmediate(t);
        return "밝은픽셀 " + (300f * white / px.Length).ToString("F2") + "% → " + path;
    }

    IEnumerator Co()
    {
        sb = new StringBuilder();
        L("=== WL-816j2 ③ 띠 진단 ===");
        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 (foam == null || water == null || live == null) { L("🔴 없음"); Done(); yield break; }
        var mr = foam.GetComponent<MeshRenderer>();
        var mf = foam.GetComponent<MeshFilter>();
        var m = mr.sharedMaterial;
        L("띠 머티리얼 = " + m.name + " shader=" + m.shader.name + " renderQueue=" + m.renderQueue
          + " _Surface=" + m.GetFloat("_Surface") + " _ZWrite=" + m.GetFloat("_ZWrite")
          + " _SrcBlend=" + m.GetFloat("_SrcBlend") + " _DstBlend=" + m.GetFloat("_DstBlend")
          + " _BaseMap=" + (m.GetTexture("_BaseMap") ? m.GetTexture("_BaseMap").name : "없음")
          + " keyword_TRANSPARENT=" + m.IsKeywordEnabled("_SURFACE_TYPE_TRANSPARENT"));
        L("물 머티리얼 renderQueue = " + water.sharedMaterial.renderQueue);
        L("띠 메시 bounds = " + mf.sharedMesh.bounds + " · 렌더러 enabled=" + mr.enabled + " bounds=" + mr.bounds);

        // 카메라를 물가로 가까이 — 띠가 잘 보이는 확대
        var cgo = new GameObject("~WL816j2DCam"); cgo.hideFlags = HideFlags.DontSave;
        var cam = cgo.AddComponent<Camera>();
        cam.fieldOfView = 34f; cam.nearClipPlane = 0.1f; cam.farClipPlane = 2000f;
        cam.clearFlags = CameraClearFlags.Skybox; cam.cullingMask = ~0; cam.depth = -100f;
        cgo.AddComponent<UniversalAdditionalCameraData>().renderPostProcessing = true;
        var b = mr.bounds;
        cgo.transform.position = new Vector3(b.center.x, 3.2f, b.min.z - 9f);
        cgo.transform.LookAt(new Vector3(b.center.x, -1f, b.min.z + 2f));

        L("");
        L("1) 지금 그대로   " + Shot(cam, D + "g_diag_asis.png"));

        // ① 큐를 강제로 물 뒤로
        var q = new Material(m); q.renderQueue = 3100;
        mr.sharedMaterial = q; yield return null; yield return null;
        L("2) renderQueue 3100 강제 " + Shot(cam, D + "g_diag_q3100.png"));

        // ② 물을 끄고 띠만
        water.enabled = false; yield return null; yield return null;
        L("3) 물 끄고 띠만  " + Shot(cam, D + "g_diag_bandonly.png"));
        water.enabled = true; yield return null;

        // ③ 알파 무시하고 불투명 빨강 — 띠 메시가 어디에 있는지
        var dbg = new Material(Shader.Find("Universal Render Pipeline/Unlit"));
        dbg.SetColor("_BaseColor", new Color(1f, 0f, 0f, 1f));
        dbg.renderQueue = 3100;
        mr.sharedMaterial = dbg; yield return null; yield return null;
        L("4) 띠 메시 위치(빨강) " + Shot(cam, D + "g_diag_red.png"));
        L("   PD 구도에서도 " + Shot(live, D + "g_diag_red_pd.png"));

        mr.sharedMaterial = q; yield return null;
        L("5) 큐 3100 · PD 구도 " + Shot(live, D + "g_diag_q3100_pd.png"));

        Object.DestroyImmediate(cgo);
        Done();
    }
    void Done()
    {
        System.IO.File.WriteAllText("AgentScripts/WL816j2_DIAG.txt", sb.ToString());
        Debug.Log("[816j2 diag]\n" + sb);
    }
}