using System;
using System.Globalization;
using System.Threading.Tasks;

namespace MyAvaloniaApp.Services
{
    /// <summary>
    /// 语言管理器，用于管理应用程序的语言设置
    /// </summary>
    public class LanguageManager
    {
        private readonly IResourceService _resourceService;
        private CultureInfo _currentCulture;
        
        public event EventHandler<CultureInfo>? LanguageChanged;
        
        public LanguageManager(IResourceService resourceService)
        {
            _resourceService = resourceService;
            _currentCulture = CultureInfo.CurrentCulture;
        }
        
        /// <summary>
        /// 获取当前语言
        /// </summary>
        public CultureInfo CurrentCulture => _currentCulture;
        
        /// <summary>
        /// 获取当前语言名称
        /// </summary>
        public string CurrentLanguageName => _currentCulture.Name.StartsWith("zh") ? "中文" : "English";
        
        /// <summary>
        /// 切换语言
        /// </summary>
        /// <param name="culture">目标语言文化信息</param>
        public async Task SwitchLanguageAsync(CultureInfo culture)
        {
            if (_currentCulture != culture)
            {
                _currentCulture = culture;
                _resourceService.SetCulture(culture);
                
                // 触发语言变更事件
                LanguageChanged?.Invoke(this, culture);
                
                // 这里可以添加其他语言切换逻辑，比如重新加载UI等
                await OnLanguageChangedAsync(culture);
            }
        }
        
        /// <summary>
        /// 切换到中文
        /// </summary>
        public async Task SwitchToChineseAsync()
        {
            await SwitchLanguageAsync(new CultureInfo("zh-CN"));
        }
        
        /// <summary>
        /// 切换到英文
        /// </summary>
        public async Task SwitchToEnglishAsync()
        {
            await SwitchLanguageAsync(new CultureInfo("en-US"));
        }
        
        /// <summary>
        /// 切换语言（中文/英文）
        /// </summary>
        public async Task ToggleLanguageAsync()
        {
            if (_currentCulture.Name.StartsWith("zh"))
            {
                await SwitchToEnglishAsync();
            }
            else
            {
                await SwitchToChineseAsync();
            }
        }
        
        private async Task OnLanguageChangedAsync(CultureInfo culture)
        {
            // 这里可以添加语言切换后的处理逻辑
            // 比如重新加载页面内容、更新UI等
            await Task.CompletedTask;
        }
    }
}