#if UNITY_EDITOR
using UnityEditor;
using UnityEngine;
using BaseGames.World.Map;

namespace BaseGames.Editor.Map
{
    /// <summary>
    /// MapRoomDataSO 自定义编辑器（架构 15_MapShopModule §5）。
    /// 在 Scene View 中直接拖拽调整房间格子位置/大小；提供一键居中 SceneView 快捷按钮。
    /// 拖动自动吸附到整格精度；左下/右上角可独立拖动（含反转保护）；支持 Undo。
    /// </summary>
    [CustomEditor(typeof(MapRoomDataSO))]
    public class MapRoomDataEditor : UnityEditor.Editor
    {
        private const float CELL_SIZE = 1f;   // 每格在 Scene 中的世界单位尺寸

        private static readonly Color FillColor    = new Color(0.2f, 0.6f, 1f, 0.15f);
        private static readonly Color OutlineColor = new Color(0.2f, 0.6f, 1f, 0.9f);
        private static readonly Color HandleColor  = new Color(1f,   0.85f, 0.2f, 1f);

        private static readonly GUIStyle LabelStyle = new GUIStyle
        {
            alignment = TextAnchor.MiddleCenter,
            fontStyle = FontStyle.Bold,
            normal    = { textColor = Color.white },
        };

        private MapRoomDataSO _target;

        private void OnEnable() => _target = (MapRoomDataSO)target;

        // ── Inspector ─────────────────────────────────────────────────────────

        public override void OnInspectorGUI()
        {
            DrawDefaultInspector();
            EditorGUILayout.Space(8);

            EditorGUILayout.HelpBox(
                "在 Scene View 中可直接拖拽房间角点调整 GridPosition / GridSize。\n" +
                "拖动自动吸附到 1 格精度，支持 Undo。",
                MessageType.Info);

            if (GUILayout.Button("居中 Scene View 到此房间", GUILayout.Height(28)))
                CenterSceneViewOnRoom(_target);
        }

        // ── Scene GUI ─────────────────────────────────────────────────────────

        private void OnSceneGUI()
        {
            if (_target == null) return;

            Vector3 origin = new Vector3(
                _target.GridPosition.x * CELL_SIZE,
                _target.GridPosition.y * CELL_SIZE, 0f);
            Vector3 size = new Vector3(
                _target.GridSize.x * CELL_SIZE,
                _target.GridSize.y * CELL_SIZE, 0f);

            // 绘制半透明矩形（Vector3[] 重载正确）
            Handles.DrawSolidRectangleWithOutline(GetRectCorners(origin, size), FillColor, OutlineColor);

            // 房间 ID 标签（居中、加粗、白色）
            Handles.Label(origin + size * 0.5f,
                string.IsNullOrEmpty(_target.RoomId) ? "(No RoomId)" : _target.RoomId,
                LabelStyle);

            // ── 双角控制点（左下 = BL，右上 = TR）────────────────────────────
            EditorGUI.BeginChangeCheck();
            Vector3 newBL = DragHandle(origin,        "BL");
            Vector3 newTR = DragHandle(origin + size, "TR");

            if (EditorGUI.EndChangeCheck())
            {
                Undo.RecordObject(_target, "Resize MapRoom");

                // 防反转：确保 BL ≤ TR
                float minX = Mathf.Min(newBL.x, newTR.x);
                float minY = Mathf.Min(newBL.y, newTR.y);
                float maxX = Mathf.Max(newBL.x, newTR.x);
                float maxY = Mathf.Max(newBL.y, newTR.y);

                _target.GridPosition = ToGrid(new Vector2(minX, minY));
                var newSize = ToGrid(new Vector2(maxX, maxY)) - _target.GridPosition;
                _target.GridSize = new Vector2Int(Mathf.Max(1, newSize.x), Mathf.Max(1, newSize.y));

                EditorUtility.SetDirty(_target);
            }
        }

        // ── 帮助方法 ──────────────────────────────────────────────────────────

        private static Vector3 DragHandle(Vector3 pos, string label)
        {
            float   sz       = HandleUtility.GetHandleSize(pos) * 0.12f;
            Color   prev     = Handles.color;
            Handles.color    = HandleColor;
            var result = Handles.FreeMoveHandle(pos, sz, Vector3.zero, Handles.DotHandleCap);
            Handles.color    = prev;
            return SnapToGrid(result);
        }

        /// <summary>将世界坐标吸附到最近格点。</summary>
        private static Vector3 SnapToGrid(Vector3 world)
            => new(Mathf.Round(world.x / CELL_SIZE) * CELL_SIZE,
                   Mathf.Round(world.y / CELL_SIZE) * CELL_SIZE,
                   0f);

        private static Vector2Int ToGrid(Vector2 world)
            => new(Mathf.RoundToInt(world.x / CELL_SIZE),
                   Mathf.RoundToInt(world.y / CELL_SIZE));

        private static void CenterSceneViewOnRoom(MapRoomDataSO room)
        {
            if (room == null) return;
            var sv = SceneView.lastActiveSceneView;
            if (sv == null) return;

            Vector3 center = new Vector3(
                (room.GridPosition.x + room.GridSize.x * 0.5f) * CELL_SIZE,
                (room.GridPosition.y + room.GridSize.y * 0.5f) * CELL_SIZE, 0f);

            sv.Frame(new Bounds(center, new Vector3(
                room.GridSize.x * CELL_SIZE * 2f,
                room.GridSize.y * CELL_SIZE * 2f, 1f)), false);
        }

        private static Vector3[] GetRectCorners(Vector3 origin, Vector3 size)
            => new[]
            {
                origin,
                origin + new Vector3(size.x, 0f, 0f),
                origin + size,
                origin + new Vector3(0f, size.y, 0f),
            };
    }
}
#endif