// WL796_PixelProbe.cs — 화면 특정 픽셀을 덮고 있는 활성 UI Graphic 을 전부 나열한다(정체불명 사각형 추적).
//   unity command run_script --file AgentScripts/WL796_PixelProbe.cs --entry WL796_PixelProbe.At --args '[30,20]'
using System.Linq;
using System.Text;
using UnityEngine;
using UnityEngine.UI;

public static class WL796_PixelProbe
{
    static Rect ScreenRect(RectTransform rt, Canvas canvas)
    {
        var corners = new Vector3[4];
        rt.GetWorldCorners(corners);
        var cam = canvas != null && canvas.renderMode != RenderMode.ScreenSpaceOverlay ? canvas.worldCamera : null;
        Vector2 min = new Vector2(float.MaxValue, float.MaxValue), max = new Vector2(float.MinValue, float.MinValue);
        for (int i = 0; i < 4; i++)
        {
            Vector2 p = cam != null ? (Vector2)RectTransformUtility.WorldToScreenPoint(cam, corners[i]) : (Vector2)corners[i];
            min = Vector2.Min(min, p); max = Vector2.Max(max, p);
        }
        return Rect.MinMaxRect(min.x, min.y, max.x, max.y);
    }

    static string Path(Transform t)
    {
        var sb = new StringBuilder(t.name);
        var p = t.parent;
        while (p != null) { sb.Insert(0, p.name + "/"); p = p.parent; }
        return sb.ToString();
    }

    public static object At(float x, float y)
    {
        if (!Application.isPlaying) return "not playing";
        var pt = new Vector2(x, y);
        var sb = new StringBuilder("point=" + pt + " screen=" + Screen.width + "x" + Screen.height + "\n");
        var all = Object.FindObjectsByType<Graphic>(FindObjectsInactive.Exclude, FindObjectsSortMode.None)
                        .Where(g => g.isActiveAndEnabled && g.gameObject.activeInHierarchy);
        foreach (var g in all)
        {
            var canvas = g.canvas;
            var r = ScreenRect(g.rectTransform, canvas);
            if (!r.Contains(pt)) continue;
            var cg = g.GetComponentInParent<CanvasGroup>();
            sb.AppendLine("  " + Path(g.transform) + "  [" + g.GetType().Name + "] rect=" + r.ToString("F0") +
                          " color=" + g.color + " a=" + g.color.a.ToString("F2") +
                          (cg != null ? " parentCG.alpha=" + cg.alpha : "") +
                          " sortOrder=" + (canvas != null ? canvas.sortingOrder : 0));
        }
        return sb.ToString();
    }
}