using UnityEngine;
using UnityEngine.Localization;
using UnityEngine.Localization.Settings;
using UnityEngine.Localization.Tables;
#if UNITY_EDITOR
using UnityEditor;
#endif

namespace AibisDream.Framework
{
    public static class LocalizationKit
    {
        private const string LocalizationPrefix = "l10n.";
        private const string ActorTableName = "ActorName";
        private const string ParamTableName = "Params";

        private static LocalizationTable _paramTable;

        public static LocalizationTable ActorTable { get; private set; }

        public static Locale CurrentLocale => LocalizationSettings.SelectedLocale;

        static LocalizationKit()
        {
#if UNITY_EDITOR
            EditorApplication.playModeStateChanged += OnPlayModeChanged;
#else
            _paramTable = new LocalizationTable(ParamTableName);
            ActorTable = new LocalizationTable(ActorTableName);
            LocalizationSettings.SelectedLocaleChanged += OnLocaleChanged;
#endif
        }

        private static void OnLocaleChanged(Locale locale)
        {
            EnumEventSystem.Global.Send(SettingChangeEvent.LocaleChanged, locale);
        }

#if UNITY_EDITOR
        private static void OnPlayModeChanged(PlayModeStateChange playMode)
        {
            if (playMode == PlayModeStateChange.EnteredPlayMode)
            {
                // 进入游戏模式的时候
                _paramTable?.Dispose();
                ActorTable?.Dispose();
                _paramTable = new LocalizationTable(ParamTableName);
                ActorTable = new LocalizationTable(ActorTableName);
                LocalizationSettings.SelectedLocaleChanged += OnLocaleChanged;
            }
            else if (playMode == PlayModeStateChange.ExitingPlayMode)
            {
                _paramTable?.Dispose();
                ActorTable?.Dispose();
                _paramTable = null;
                ActorTable = null;
                LocalizationSettings.SelectedLocaleChanged -= OnLocaleChanged;
            }
        }
#endif

        public static async void SwitchLanguage(string localeCode)
        {
            // 等待本地化系统初始化完成
            await LocalizationSettings.InitializationOperation.Task;

            var selectedLocale =
                LocalizationSettings.AvailableLocales.Locales.Find(locale => locale.Identifier.Code == localeCode);

            if (selectedLocale)
            {
                LocalizationSettings.SelectedLocale = selectedLocale;
            }
            else
            {
                Debug.LogWarning($"Locale with code {localeCode} not found.");
            }
        }

        /// <summary>
        /// 本地化参数
        /// </summary>
        /// <param name="param">参数名</param>
        /// <param name="table">本地化表</param>
        /// <returns></returns>
        public static string LocalizeParam(string param, LocalizationTable table)
        {
            // 非本地化参数直接返回
            if (!param.StartsWith(LocalizationPrefix)) return param;

            var localizationKey = param[LocalizationPrefix.Length..];
            // 获取本地化值
            if (table.TryGetValue(localizationKey, out var value))
            {
                return value.LocalizedValue;
            }

            // 如果找不到，则使用原始值
            Debug.LogWarning($"Variable Key '{localizationKey}' not found in localization table.");
            return localizationKey;
        }

        /// <summary>
        /// 本地化参数
        /// </summary>
        /// <param name="param"></param>
        /// <returns></returns>
        public static string LocalizeParam(string param)
        {
            return LocalizeParam(param, _paramTable);
        }

        public static string GetL10NParamKey(string key)
        {
            // 本地化参数则去除前缀，非本地化参数直接返回
            return key.StartsWith(LocalizationPrefix) ? key[LocalizationPrefix.Length..] : key;
        }

        /// <summary>
        /// 确保本地化系统已初始化
        /// </summary>
        /// <returns>初始化操作</returns>
        public static async void EnsureInitialized()
        {
            await LocalizationSettings.InitializationOperation.Task;
        }
    }

    public class LocalizationTable
    {
        public string TableName { get; }

        private StringTable _stringTable;
        private bool _isInitialized;

        public LocalizationTable(string tableName)
        {
            TableName = tableName;
            Debug.Log($"开始初始化表格{tableName}");
            InitializeAsync();
        }

        private async void InitializeAsync()
        {
            // 等待本地化系统初始化完成
            await LocalizationSettings.InitializationOperation.Task;

            _stringTable = LocalizationSettings.StringDatabase.GetTable(TableName);
            LocalizationSettings.SelectedLocaleChanged += OnLocaleChanged;
            _isInitialized = true;

            Debug.Log($"表格{TableName}已成功加载");
        }

        public void Dispose()
        {
            if (_isInitialized)
            {
                LocalizationSettings.SelectedLocaleChanged -= OnLocaleChanged;
            }
            _stringTable = null;
            _isInitialized = false;
        }

        private void OnLocaleChanged(Locale locale)
        {
            if (_isInitialized)
            {
                _stringTable = LocalizationSettings.StringDatabase.GetTable(TableName);
            }
        }

        public StringTableEntry this[string key] => _isInitialized ? _stringTable?[key] : null;

        public bool TryGetValue(string key, out StringTableEntry value)
        {
            if (_isInitialized && _stringTable != null)
            {
                value = _stringTable.GetEntry(key);
                return value != null;
            }
            value = null;
            return false;
        }

        public LocaleIdentifier? LocaleIdentifier => _isInitialized ? _stringTable?.LocaleIdentifier : null;
    }
}