#if UNITY_EDITOR
using System;
using System.Collections.Generic;
using SepCore.UI;
using SepCore.UIRouter;
using UnityEditor;
using UnityEditorInternal;
using UnityEngine;

namespace SepCore.Editor
{
    [CustomEditor(typeof(UIRouterComponent))]
    public class UIRouterComponentEditor : UnityEditor.Editor
    {
        private SerializedProperty _bindingsProperty;
        private GUIContent[] _controllerDisplayNames;
        private string[] _controllerTypeNames;
        private ReorderableList _bindingsList;

        private void OnEnable()
        {
            _bindingsProperty = serializedObject.FindProperty("_controllerBindings");
            BuildControllerTypeOptions();
            BuildReorderableList();
        }

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

            EditorGUILayout.HelpBox("配置 UIFormType 到 IUIFormController 的映射。运行时 Awake 自动注册。",
                MessageType.Info);

            if (GUILayout.Button("Refresh Controller List"))
            {
                BuildControllerTypeOptions();
            }

            if (_bindingsList == null)
            {
                EditorGUILayout.HelpBox("Bindings list init failed.", MessageType.Error);
            }
            else
            {
                _bindingsList.DoLayoutList();
            }

            serializedObject.ApplyModifiedProperties();
        }

        private void BuildReorderableList()
        {
            if (_bindingsProperty == null)
            {
                return;
            }

            _bindingsList = new ReorderableList(serializedObject, _bindingsProperty, true, true, true, true);
            _bindingsList.drawHeaderCallback = rect => { EditorGUI.LabelField(rect, "Controller Bindings"); };
            _bindingsList.elementHeight = EditorGUIUtility.singleLineHeight * 2 + 8f;
            _bindingsList.drawElementCallback = DrawElement;
            _bindingsList.onAddCallback = list =>
            {
                _bindingsProperty.InsertArrayElementAtIndex(_bindingsProperty.arraySize);
                SerializedProperty item = _bindingsProperty.GetArrayElementAtIndex(_bindingsProperty.arraySize - 1);
                item.FindPropertyRelative("_controllerTypeName").stringValue = string.Empty;
                item.FindPropertyRelative("_uiFormType").enumValueIndex = 0;
                serializedObject.ApplyModifiedProperties();
            };
        }

        private void BuildControllerTypeOptions()
        {
            List<Type> controllerTypes = new();
            foreach (Type type in TypeCache.GetTypesDerivedFrom<IUIController>())
            {
                if (type.IsAbstract || type.IsInterface || type.ContainsGenericParameters)
                {
                    continue;
                }

                controllerTypes.Add(type);
            }

            controllerTypes.Sort((a, b) => string.CompareOrdinal(a.FullName, b.FullName));

            _controllerTypeNames = new string[controllerTypes.Count + 1];
            _controllerDisplayNames = new GUIContent[controllerTypes.Count + 1];
            _controllerTypeNames[0] = string.Empty;
            _controllerDisplayNames[0] = new GUIContent("<None>");

            for (int i = 0; i < controllerTypes.Count; i++)
            {
                Type type = controllerTypes[i];
                _controllerTypeNames[i + 1] = type.AssemblyQualifiedName;
                _controllerDisplayNames[i + 1] = new GUIContent(type.FullName);
            }
        }

        private void DrawElement(Rect rect, int index, bool isActive, bool isFocused)
        {
            SerializedProperty item = _bindingsProperty.GetArrayElementAtIndex(index);
            SerializedProperty formTypeProperty = item.FindPropertyRelative("_uiFormType");
            SerializedProperty controllerTypeProperty = item.FindPropertyRelative("_controllerTypeName");

            Rect row1 = new Rect(rect.x, rect.y + 2f, rect.width, EditorGUIUtility.singleLineHeight);
            Rect row2 = new Rect(rect.x, rect.y + EditorGUIUtility.singleLineHeight + 6f, rect.width,
                EditorGUIUtility.singleLineHeight);

            EditorGUI.PropertyField(row1, formTypeProperty, new GUIContent("UI Form Type"));
            DrawControllerPopup(row2, controllerTypeProperty);
        }

        private void DrawControllerPopup(Rect rect, SerializedProperty controllerTypeProperty)
        {
            int currentIndex = 0;
            string currentValue = controllerTypeProperty.stringValue;
            for (int i = 0; i < _controllerTypeNames.Length; i++)
            {
                if (_controllerTypeNames[i] == currentValue)
                {
                    currentIndex = i;
                    break;
                }
            }

            int selected =
                EditorGUI.Popup(rect, new GUIContent("Controller Type"), currentIndex, _controllerDisplayNames);
            controllerTypeProperty.stringValue = _controllerTypeNames[selected];
        }
    }
}
#endif