using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;
using UnityEditorInternal;

namespace AlicizaX.Localization.Editor
{
    internal class LocalizationSettingsProvider : UnityEditor.SettingsProvider
    {
        private SerializedObject _serializedObject;
        private SerializedProperty _languageTypes;
        private ReorderableList _languageList;

        public LocalizationSettingsProvider() : base("Project/Localization Settings", SettingsScope.Project) { }

        public override void OnActivate(string searchContext, VisualElement rootElement)
        {
            InitGUI();
        }

        private void InitGUI()
        {
            var setting = LocalizationConfiguration.Instance;
            _serializedObject?.Dispose();
            _serializedObject = new SerializedObject(setting);
            _languageTypes = _serializedObject.FindProperty("LanguageTypes");

            // 自定义 ReorderableList
            _languageList = new ReorderableList(_serializedObject, _languageTypes,
                draggable: false,    // 禁止拖拽
                displayHeader: true,
                displayAddButton: true,
                displayRemoveButton: true);

            _languageList.drawHeaderCallback = rect =>
            {
                EditorGUI.LabelField(rect, "Language Types");
            };

            _languageList.drawElementCallback = (rect, index, isActive, isFocused) =>
            {
                var element = _languageTypes.GetArrayElementAtIndex(index);
                rect.y += 2;

                // 只显示可编辑的 string 字段
                element.stringValue = EditorGUI.TextField(
                    new Rect(rect.x, rect.y, rect.width, EditorGUIUtility.singleLineHeight),
                    element.stringValue);
            };
        }

        public override void OnGUI(string searchContext)
        {
            if (_serializedObject == null || !_serializedObject.targetObject)
            {
                InitGUI();
            }

            _serializedObject.Update();
            EditorGUI.BeginChangeCheck();

            // 使用 ReorderableList 绘制
            _languageList.DoLayoutList();

            if (EditorGUI.EndChangeCheck())
            {
                _serializedObject.ApplyModifiedProperties();
                LocalizationConfiguration.Save();
            }
        }

        public override void OnDeactivate()
        {
            base.OnDeactivate();
            LocalizationConfiguration.Save();
        }

        static LocalizationSettingsProvider s_provider;

        [SettingsProvider]
        public static SettingsProvider CreateMyCustomSettingsProvider()
        {
            if (s_provider == null)
            {
                s_provider = new LocalizationSettingsProvider();
            }
            return s_provider;
        }
    }
}