// WL-814q — 캡처 4장(+개요) · 1080×1920 · Screenshots_WL/WL814q/
public static class WL814q_Capture
{
    const string Out = "Screenshots_WL/WL814q/";
    const string ScenePath = "Assets/WL/Look/Arena/Scenes/WL_ArenaProto.unity";
    const string DemoPath = "Assets/3DPixelArtEnvironment/Demo/Demo.unity";
    const int W = 1080, H = 1920;

    static UnityEngine.Texture2D Shot(UnityEngine.Camera cam, int w, int h)
    {
        var rt = new UnityEngine.RenderTexture(w, h, 24, UnityEngine.RenderTextureFormat.ARGB32,
            UnityEngine.RenderTextureReadWrite.sRGB);
        rt.filterMode = UnityEngine.FilterMode.Point;
        rt.antiAliasing = 1;
        rt.Create();
        var prev = cam.targetTexture;
        cam.targetTexture = rt;
        cam.Render();
        var oldActive = 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 = oldActive;
        cam.targetTexture = prev;
        rt.Release();
        UnityEngine.Object.DestroyImmediate(rt);
        return tex;
    }

    /// <summary>점(Point) 확대 — 도트 격자를 그대로 키운다.</summary>
    static UnityEngine.Texture2D Upscale(UnityEngine.Texture2D src, int w, int h)
    {
        var d = new UnityEngine.Texture2D(w, h, UnityEngine.TextureFormat.RGB24, false);
        var sp = src.GetPixels32();
        var dp = new UnityEngine.Color32[w * h];
        for (int y = 0; y < h; y++)
        {
            int sy = y * src.height / h; if (sy >= src.height) sy = src.height - 1;
            for (int x = 0; x < w; x++)
            {
                int sx = x * src.width / w; if (sx >= src.width) sx = src.width - 1;
                dp[y * w + x] = sp[sy * src.width + sx];
            }
        }
        d.SetPixels32(dp); d.Apply();
        return d;
    }

    static void Save(UnityEngine.Texture2D t, string name)
    {
        var dir = System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), Out);
        System.IO.Directory.CreateDirectory(dir);
        System.IO.File.WriteAllBytes(System.IO.Path.Combine(dir, name), UnityEngine.ImageConversion.EncodeToPNG(t));
        UnityEngine.Object.DestroyImmediate(t);
    }

    /// <summary>도트A: pixelHeight 240 저해상도 렌더 → 점 확대.</summary>
    static UnityEngine.Texture2D DotA(UnityEngine.Camera cam, float orthoSize)
    {
        bool o = cam.orthographic; float os = cam.orthographicSize;
        cam.orthographic = true; cam.orthographicSize = orthoSize;
        int ph = 240, pw = UnityEngine.Mathf.RoundToInt(240f * W / H);   // 135×240
        var small = Shot(cam, pw, ph);
        var big = Upscale(small, W, H);
        UnityEngine.Object.DestroyImmediate(small);
        cam.orthographic = o; cam.orthographicSize = os;
        return big;
    }

    static UnityEngine.Texture2D SideBySide(UnityEngine.Texture2D a, UnityEngine.Texture2D b, int gap)
    {
        int w = a.width + gap + b.width, h = UnityEngine.Mathf.Max(a.height, b.height);
        var d = new UnityEngine.Texture2D(w, h, UnityEngine.TextureFormat.RGB24, false);
        var px = new UnityEngine.Color32[w * h];
        for (int i = 0; i < px.Length; i++) px[i] = new UnityEngine.Color32(18, 18, 22, 255);
        d.SetPixels32(px); d.Apply();
        UnityEngine.Graphics.CopyTexture(a, 0, 0, 0, 0, a.width, a.height, d, 0, 0, 0, 0);
        UnityEngine.Graphics.CopyTexture(b, 0, 0, 0, 0, b.width, b.height, d, 0, 0, a.width + gap, 0);
        return d;
    }

    public static string Run()
    {
        var sb = new System.Text.StringBuilder();
        var scene = UnityEditor.SceneManagement.EditorSceneManager.OpenScene(ScenePath,
            UnityEditor.SceneManagement.OpenSceneMode.Single);
        // 🔴 Water_Plane 프리팹의 PlanarReflectionProbe 도 Camera 다 — 이름으로 고른다
        UnityEngine.Camera cam = null;
        foreach (var c in UnityEngine.Object.FindObjectsByType<UnityEngine.Camera>(
                     UnityEngine.FindObjectsSortMode.None))
            if (c.gameObject.name == "Main Camera") cam = c;
        if (cam == null) return "NO CAMERA";
        var camPos = cam.transform.position;
        var camRot = cam.transform.rotation;
        // 🔴 씬을 연 직후 첫 렌더는 터레인 머티리얼/스플랫이 아직 안 붙는다 — 버리는 렌더 2장으로 예열
        for (int i = 0; i < 2; i++) UnityEngine.Object.DestroyImmediate(Shot(cam, 64, 64));

        // ⓐ 일반 모드 — 같은 위치·각도 · 퍼스펙티브 · 풀해상도(도트 없음)
        cam.orthographic = false;
        // 주시점까지 거리에서 세로 화각이 ortho 3.4 와 같아지도록 FOV 를 맞춘다(같은 구도 유지)
        float dist = UnityEngine.Vector3.Distance(camPos, new UnityEngine.Vector3(0f, 1.06f, 0f));
        cam.fieldOfView = 2f * UnityEngine.Mathf.Atan2(3.4f, dist) * UnityEngine.Mathf.Rad2Deg;
        var a = Shot(cam, W, H);
        Save(a, "a_normal_1080x1920.png");
        sb.AppendLine("a_normal: perspective fov=" + cam.fieldOfView.ToString("F2") + " dist=" + dist.ToString("F3"));
        cam.orthographic = true; cam.orthographicSize = 3.4f;

        // ⓑ 도트A — 같은 구도 · orthoSize 3.4 · pixelHeight 240
        Save(DotA(cam, 3.4f), "b_dotA_1080x1920.png");
        sb.AppendLine("b_dotA: ortho 3.4 · 135x240 -> point x8");

        // ⓒ 캐릭터가 보이는 눈높이 구도(도트A) — 더 가깝고 낮게
        // 캐릭터를 크게 — 도트A 각도(43.61°) 유지 · orthoSize 만 줄이고 주시점을 앞으로 밀어 캐릭터를 아래쪽에
        cam.transform.position = camPos; cam.transform.rotation = camRot;
        var fwd = cam.transform.forward; fwd.y = 0f; fwd.Normalize();
        cam.transform.position = camPos + fwd * 1.9f;
        Save(DotA(cam, 2.2f), "c_dotA_eye_1080x1920.png");
        sb.AppendLine("c_dotA_eye: ortho 2.0 · 135x240 -> point x8 · pos=" + cam.transform.position);

        // 개요(참고) — 아레나 전체 + 연못 + 풍차 (퍼스펙티브 3/4 뷰)
        cam.orthographic = false;
        cam.fieldOfView = 40f;
        cam.transform.position = new UnityEngine.Vector3(30f, 20f, -33f);
        cam.transform.LookAt(new UnityEngine.Vector3(1f, 1.5f, -1f));
        Save(Shot(cam, W, H), "e_overview_1080x1920.png");
        sb.AppendLine("e_overview: perspective fov40 @" + cam.transform.position);
        cam.orthographic = true; cam.orthographicSize = 3.4f;

        // ⓓ 비교용 — 데모의 부품은 우리보다 5~6배 크다(House 9.2 m · Tree 13.5 m vs 캐릭터 1.19 m).
        //    도트A(ortho 3.4)로 데모를 찍으면 집 벽 한 조각만 나온다 → 두 씬 모두 ortho 10 · 같은 내림각 43.61° 로 맞춘다.
        const float CmpOrtho = 10f;
        float kk = CmpOrtho / 3.4f;   // 각도 유지 · 카메라만 뒤로(near 0.3 에 잘리지 않게)
        cam.transform.position = camPos * kk; cam.transform.rotation = camRot;
        cam.orthographic = true; cam.orthographicSize = CmpOrtho;
        var mine = DotA(cam, CmpOrtho);
        var mineHalf = Upscale(mine, W / 2, H / 2);
        UnityEngine.Object.DestroyImmediate(mine);
        // 텍스처를 씬 전환에서 지키기
        mineHalf.hideFlags = UnityEngine.HideFlags.HideAndDontSave;

        // 데모 씬 — 같은 규격(도트A)으로. 🔴 저장하지 않는다.
        UnityEditor.SceneManagement.EditorSceneManager.OpenScene(DemoPath,
            UnityEditor.SceneManagement.OpenSceneMode.Single);
        UnityEngine.Camera demoCam = null;
        foreach (var c in UnityEngine.Object.FindObjectsByType<UnityEngine.Camera>(
                     UnityEngine.FindObjectsSortMode.None))
            if (c.gameObject.name == "Main Camera") demoCam = c;
        UnityEngine.Texture2D demoHalf = null;
        if (demoCam != null)
        {
            // 데모의 집 앞(House (2))을 기준점으로 — 오브젝트 바운즈에서 직접 발밑을 잡는다(지형 추정 금지)
            var focus = new UnityEngine.Vector3(94f, 4f, 78f);
            var hg = UnityEngine.GameObject.Find("House (2)");
            if (hg == null) hg = UnityEngine.GameObject.Find("Light_Post");
            if (hg != null)
            {
                var hr = hg.GetComponentInChildren<UnityEngine.Renderer>();
                if (hr != null)
                {
                    var hb = hr.bounds;
                    focus = new UnityEngine.Vector3(hb.center.x, hb.min.y, hb.center.z);
                    sb.AppendLine("demo focus = " + hg.name + " bounds " + hb.size + " @ " + focus);
                }
            }
            float camUp = 5.4335f, camHoriz = 4.5911f;
            float yaw = 215f;
            var dir = new UnityEngine.Vector3(UnityEngine.Mathf.Sin(yaw * UnityEngine.Mathf.Deg2Rad), 0f,
                                              UnityEngine.Mathf.Cos(yaw * UnityEngine.Mathf.Deg2Rad));
            float k = CmpOrtho / 3.4f;   // 같은 각도를 유지한 채 카메라만 뒤로
            demoCam.transform.position = focus + UnityEngine.Vector3.up * camUp * k - dir * camHoriz * k;
            demoCam.transform.LookAt(focus + UnityEngine.Vector3.up * 1.06f);
            demoCam.orthographic = true; demoCam.orthographicSize = CmpOrtho;
            var d = DotA(demoCam, CmpOrtho);
            demoHalf = Upscale(d, W / 2, H / 2);
            demoHalf.hideFlags = UnityEngine.HideFlags.HideAndDontSave;
            UnityEngine.Object.DestroyImmediate(d);
            sb.AppendLine("demo shot ok @" + demoCam.transform.position);
        }
        else sb.AppendLine("DEMO CAMERA NOT FOUND");

        if (demoHalf != null)
        {
            var cmp = SideBySide(demoHalf, mineHalf, 16);
            Save(cmp, "d_compare_demo_vs_arena.png");
            sb.AppendLine("d_compare: left=Critter Demo · right=WL_ArenaProto (both dotA 240p)");
            UnityEngine.Object.DestroyImmediate(demoHalf);
        }
        UnityEngine.Object.DestroyImmediate(mineHalf);

        // 🔴 데모 씬은 저장하지 않고 원래 씬으로 되돌린다
        UnityEditor.SceneManagement.EditorSceneManager.OpenScene(ScenePath,
            UnityEditor.SceneManagement.OpenSceneMode.Single);
        sb.AppendLine("OUT " + System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), Out));
        return sb.ToString();
    }
}