#if INPUTSYSTEM_SUPPORT && UX_NAVIGATION
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;

namespace AlicizaX.UI.Extension.Editor
{
    [CustomEditor(typeof(UXNavigationScope))]
    public sealed class UXNavigationScopeEditor : UnityEditor.Editor
    {
        private SerializedProperty _defaultSelectable;
        private SerializedProperty _bakedSelectables;
        private SerializedProperty _runtimeSelectableCapacity;
        private SerializedProperty _rememberLastSelection;
        private SerializedProperty _requireSelectionWhenGamepad;
        private SerializedProperty _blockLowerScopes;
        private SerializedProperty _autoSelectFirstAvailable;

        private void OnEnable()
        {
            _defaultSelectable = serializedObject.FindProperty("_defaultSelectable");
            _bakedSelectables = serializedObject.FindProperty("_bakedSelectables");
            _runtimeSelectableCapacity = serializedObject.FindProperty("_runtimeSelectableCapacity");
            _rememberLastSelection = serializedObject.FindProperty("_rememberLastSelection");
            _requireSelectionWhenGamepad = serializedObject.FindProperty("_requireSelectionWhenGamepad");
            _blockLowerScopes = serializedObject.FindProperty("_blockLowerScopes");
            _autoSelectFirstAvailable = serializedObject.FindProperty("_autoSelectFirstAvailable");
        }

        public override void OnInspectorGUI()
        {
            serializedObject.Update();

            EditorGUILayout.PropertyField(_defaultSelectable);
            EditorGUILayout.PropertyField(_runtimeSelectableCapacity);
            EditorGUILayout.PropertyField(_rememberLastSelection);
            EditorGUILayout.PropertyField(_requireSelectionWhenGamepad);
            EditorGUILayout.PropertyField(_blockLowerScopes);
            EditorGUILayout.PropertyField(_autoSelectFirstAvailable);

            EditorGUILayout.Space();
            DrawBakeTools();

            EditorGUILayout.Space();
            EditorGUILayout.PropertyField(_bakedSelectables, true);

            EditorGUILayout.Space();
            DrawDiagnostics();

            serializedObject.ApplyModifiedProperties();
        }

        private void DrawBakeTools()
        {
            using (new EditorGUILayout.HorizontalScope())
            {
                if (GUILayout.Button("收集子 Selectable"))
                {
                    BakeSelectables();
                }

                if (GUILayout.Button("清理空引用"))
                {
                    RemoveNullEntries();
                }

                if (GUILayout.Button("按层级排序"))
                {
                    SortBakedSelectables();
                }
            }
        }

        private void DrawDiagnostics()
        {
            UXNavigationScope scope = (UXNavigationScope)target;
            EditorGUILayout.LabelField("诊断", EditorStyles.boldLabel);
            EditorGUILayout.LabelField("烘焙控件数", _bakedSelectables.arraySize.ToString());
            EditorGUILayout.LabelField("Runtime 动态控件数", Application.isPlaying ? scope.RuntimeSelectableCount.ToString() : "仅 Play Mode");
            EditorGUILayout.LabelField("被 Skip", scope.GetComponentInParent<UXNavigationSkip>(true) != null ? "是" : "否");
            EditorGUILayout.LabelField("当前 Suppressed", Application.isPlaying && scope.NavigationSuppressed ? "是" : "否");
            ValidateReferences(scope);
        }

        private void ValidateReferences(UXNavigationScope scope)
        {
            Selectable defaultSelectable = _defaultSelectable.objectReferenceValue as Selectable;
            if (defaultSelectable != null && defaultSelectable.GetComponentInParent<UXNavigationScope>(true) != scope)
            {
                EditorGUILayout.HelpBox("默认选中控件不属于当前 UXNavigationScope。", MessageType.Error);
            }

            for (int i = 0; i < _bakedSelectables.arraySize; i++)
            {
                Selectable selectable = _bakedSelectables.GetArrayElementAtIndex(i).objectReferenceValue as Selectable;
                if (selectable == null)
                {
                    EditorGUILayout.HelpBox("烘焙列表存在空引用。", MessageType.Warning);
                    continue;
                }

                if (selectable.GetComponentInParent<UXNavigationScope>(true) != scope)
                {
                    EditorGUILayout.HelpBox("烘焙列表存在跨 Scope 引用。", MessageType.Error);
                    return;
                }
            }
        }

        private void BakeSelectables()
        {
            UXNavigationScope scope = (UXNavigationScope)target;
            Selectable[] allSelectables = scope.GetComponentsInChildren<Selectable>(true);
            List<Selectable> ownedSelectables = new List<Selectable>(allSelectables.Length);
            for (int i = 0; i < allSelectables.Length; i++)
            {
                Selectable selectable = allSelectables[i];
                if (selectable != null && selectable.GetComponentInParent<UXNavigationScope>(true) == scope)
                {
                    ownedSelectables.Add(selectable);
                }
            }

            Undo.RecordObject(scope, "Bake UX Navigation Selectables");
            _bakedSelectables.arraySize = ownedSelectables.Count;
            for (int i = 0; i < ownedSelectables.Count; i++)
            {
                _bakedSelectables.GetArrayElementAtIndex(i).objectReferenceValue = ownedSelectables[i];
            }

            serializedObject.ApplyModifiedProperties();
            EditorUtility.SetDirty(scope);
        }

        private void RemoveNullEntries()
        {
            UXNavigationScope scope = (UXNavigationScope)target;
            Undo.RecordObject(scope, "Clean UX Navigation Selectables");
            for (int i = _bakedSelectables.arraySize - 1; i >= 0; i--)
            {
                if (_bakedSelectables.GetArrayElementAtIndex(i).objectReferenceValue == null)
                {
                    _bakedSelectables.DeleteArrayElementAtIndex(i);
                }
            }

            serializedObject.ApplyModifiedProperties();
            EditorUtility.SetDirty(scope);
        }

        private void SortBakedSelectables()
        {
            UXNavigationScope scope = (UXNavigationScope)target;
            List<Selectable> selectables = new List<Selectable>(_bakedSelectables.arraySize);
            for (int i = 0; i < _bakedSelectables.arraySize; i++)
            {
                Selectable selectable = _bakedSelectables.GetArrayElementAtIndex(i).objectReferenceValue as Selectable;
                if (selectable != null)
                {
                    selectables.Add(selectable);
                }
            }

            selectables.Sort(CompareSiblingPath);
            Undo.RecordObject(scope, "Sort UX Navigation Selectables");
            _bakedSelectables.arraySize = selectables.Count;
            for (int i = 0; i < selectables.Count; i++)
            {
                _bakedSelectables.GetArrayElementAtIndex(i).objectReferenceValue = selectables[i];
            }

            serializedObject.ApplyModifiedProperties();
            EditorUtility.SetDirty(scope);
        }

        private static int CompareSiblingPath(Selectable left, Selectable right)
        {
            if (left == right)
            {
                return 0;
            }

            string leftPath = GetSiblingPath(left.transform);
            string rightPath = GetSiblingPath(right.transform);
            return string.CompareOrdinal(leftPath, rightPath);
        }

        private static string GetSiblingPath(Transform transform)
        {
            if (transform == null)
            {
                return string.Empty;
            }

            return transform.parent == null
                ? transform.GetSiblingIndex().ToString("D4")
                : GetSiblingPath(transform.parent) + "/" + transform.GetSiblingIndex().ToString("D4");
        }
    }
}
#endif