using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace MvvmScaffoldFrame48.Language
{
    public static class LanguageManager
    {
        public static event EventHandler LanguageChangeEvent;

        private static int _nowLoadLanguage = 0;
        public static int NowLoadLanguage
        {
            get
            {
                return _nowLoadLanguage;
            }
        }
        public static List<string> LanguageList
        {
            get
            {
                return new List<string>()
                {
                    "Chinese",
                    "English"
                };
            }
        }
        public static void ChangeLanguage(string languageCode)
        {
            // 获取现有的非语言资源字典(如样式)
            var existingNonLanguageDictionaries = Application.Current.Resources.MergedDictionaries
                .Where(rd => !IsLanguageResourceDictionary(rd))
                .ToList();

            // 清除现有字典并重新添加
            Application.Current.Resources.MergedDictionaries.Clear();

            // 先添加语言资源字典
            var languageResourceDict = new ResourceDictionary();
            switch (languageCode)
            {
                case "Chinese":
                    languageResourceDict.Source = new Uri("/Language/String_Chinese.xaml", UriKind.Relative);
                    _nowLoadLanguage = 0;
                    break;
                case "English":
                    languageResourceDict.Source = new Uri("/Language/String_English.xaml", UriKind.Relative);
                    _nowLoadLanguage = 1;
                    break;
            }
            Application.Current.Resources.MergedDictionaries.Add(languageResourceDict);

            // 再添加其他非语言资源字典（如样式）
            foreach (var dict in existingNonLanguageDictionaries)
            {
                Application.Current.Resources.MergedDictionaries.Add(dict);
            }
            OnLanguageChangeEvent();
        }

        // 辅助方法：判断是否为语言资源字典
        private static bool IsLanguageResourceDictionary(ResourceDictionary resourceDict)
        {
            if (resourceDict.Source == null) return false;

            var sourcePath = resourceDict.Source.ToString().ToLower();
            return sourcePath.Contains("/language/string_") ||
                   sourcePath.Contains("\\language\\string_");
        }

        private static void OnLanguageChangeEvent()
        {
            LanguageChangeEvent?.Invoke(null, EventArgs.Empty);
        }
    }
}