#if UNITY_EDITOR && UNITY_2021_2_OR_NEWER
using UnityEditor;
using UnityEditor.Overlays;
using UnityEngine;
using UnityEngine.UIElements;

[Overlay(typeof(SceneView), id: "mouse-world-position", displayName: "Mouse World Position")]
[Icon("d_Grid.BoxTool")]
public class MouseWorldPositionOverlay : Overlay
{
    private enum PlaneMode { XY, XZ, YZ, CameraFacing }

    private static readonly float[] Multipliers = { 1f, 10f, 100f, 1000f, 10000f, 100000f, 1000000f };

    private PlaneMode planeMode = PlaneMode.XY;
    private float planeOffset;
    private int decimals = 2;

    private Vector3 displayWorld;
    private bool hasPoint;

    private Label positionLabel;


    public override void OnCreated()
    {
        SceneView.duringSceneGui += OnSceneGUI;
    }

    public override void OnWillBeDestroyed()
    {
        SceneView.duringSceneGui -= OnSceneGUI;
    }

    public override VisualElement CreatePanelContent()
    {
        VisualElement root = new() { style = { minWidth = 220 } };

        // Плоскость
        EnumField planeModeField = new("Плоскость", planeMode);
        planeModeField.RegisterValueChangedCallback(evt => planeMode = (PlaneMode)evt.newValue);
        root.Add(planeModeField);

        // Смещение
        FloatField offsetField = new("Смещение") { value = planeOffset };
        offsetField.RegisterValueChangedCallback(evt => planeOffset = evt.newValue);
        root.Add(offsetField);

        // Знаки после запятой
        SliderInt decimalsSlider = new("Знаки", 0, 6) { value = decimals, showInputField = true };
        decimalsSlider.RegisterValueChangedCallback(evt => decimals = evt.newValue);
        root.Add(decimalsSlider);

        // Позиция (только для чтения)
        positionLabel = new Label("—") { style = { marginTop = 8, unityFontStyleAndWeight = FontStyle.Bold } };
        root.Add(positionLabel);

        // Кнопка копирования
        Button copyButton = new(() =>
        {
            if (!hasPoint) return;
            string f = "F" + decimals;
            EditorGUIUtility.systemCopyBuffer = $"{displayWorld.x.ToString(f)}, {displayWorld.y.ToString(f)}, {displayWorld.z.ToString(f)}";
        }) { text = "Копировать (x,y,z)" };
        root.Add(copyButton);

        return root;
    }

    private void OnSceneGUI(SceneView sv)
    {
        if (containerWindow != sv) return;

        Event e = Event.current;
        if (e == null) return;

        if (e.type != EventType.MouseMove && e.type != EventType.MouseDrag && e.type != EventType.Repaint)
            return;

        Ray ray = HandleUtility.GUIPointToWorldRay(e.mousePosition);
        hasPoint = TryGetPoint(ray, sv.camera, out Vector3 world);

        if (hasPoint)
        {
            float mult = Multipliers[decimals];
            displayWorld = new Vector3(
                Mathf.Ceil(world.x * mult) / mult,
                Mathf.Ceil(world.y * mult) / mult,
                Mathf.Ceil(world.z * mult) / mult
            );

            string f = "F" + decimals;
            positionLabel?.schedule.Execute(() =>
                positionLabel.text = $"X:{displayWorld.x.ToString(f)}  Y:{displayWorld.y.ToString(f)}  Z:{displayWorld.z.ToString(f)}"
            );
        }
        else
        {
            positionLabel?.schedule.Execute(() => positionLabel.text = "—");
        }
    }

    private bool TryGetPoint(Ray ray, Camera cam, out Vector3 world)
    {
        Plane plane;

        switch (planeMode)
        {
            case PlaneMode.XY:
                plane = new Plane(Vector3.forward, new Vector3(0f, 0f, planeOffset));
                break;
            case PlaneMode.XZ:
                plane = new Plane(Vector3.up, new Vector3(0f, planeOffset, 0f));
                break;
            case PlaneMode.YZ:
                plane = new Plane(Vector3.right, new Vector3(planeOffset, 0f, 0f));
                break;
            case PlaneMode.CameraFacing:
            default:
                plane = new Plane(cam.transform.forward, cam.transform.position);
                break;
        }

        if (plane.Raycast(ray, out float enter))
        {
            world = ray.GetPoint(enter);
            return true;
        }

        world = default;
        return false;
    }

}
#endif