using UnityEngine;

namespace BaseGames.Localization
{
    /// <summary>
    /// 语言设置持久化 SO（架构 16_SupportingModules §4.1）。
    /// 支持的语言列表由设计师填写；当前语言持久化到 PlayerPrefs。
    /// </summary>
    [CreateAssetMenu(menuName = "BaseGames/Settings/LanguageManager", fileName = "SET_LanguageManager")]
    public class LanguageManagerSO : ScriptableObject
    {
        private const string PrefsKey = "game_language";

        [Tooltip("游戏支持的语言 locale code 列表（如 zh-CN、en-US）")]
        public string[] supportedLocales = { "zh-CN", "en-US" };

        [Tooltip("默认语言 locale code")]
        public string defaultLocale = "zh-CN";

        public string CurrentLocale { get; private set; }

        private void OnEnable()
        {
            CurrentLocale = PlayerPrefs.GetString(PrefsKey, defaultLocale);
        }

        /// <summary>设置当前语言并持久化到 PlayerPrefs，同时通知 Unity Localization（若已安装）。</summary>
        public void SetLocale(string localeCode)
        {
            CurrentLocale = localeCode;
            PlayerPrefs.SetString(PrefsKey, localeCode);
            PlayerPrefs.Save();
            ApplyLocale(localeCode);
        }

        /// <summary>初始化时应用已保存语言。</summary>
        public void ApplySaved() => ApplyLocale(CurrentLocale);

        private static void ApplyLocale(string localeCode)
        {
#if UNITY_LOCALIZATION
            var locales = UnityEngine.Localization.Settings.LocalizationSettings.AvailableLocales;
            var locale  = locales?.GetLocale(new UnityEngine.Localization.LocaleIdentifier(localeCode));
            if (locale != null)
                UnityEngine.Localization.Settings.LocalizationSettings.SelectedLocale = locale;
#else
            Debug.Log($"[LanguageManager] 语言设为 {localeCode}（Unity Localization 包未安装，仅记录 PlayerPrefs）。");
#endif
        }
    }
}