import Foundation
import SwiftUI
import Combine

// 支持的语言枚举
enum Language: String, CaseIterable {
    case english = "en"
    case chinese = "zh-Hans"
    
    var displayName: String {
        switch self {
        case .english:
            return "English"
        case .chinese:
            return "中文"
        }
    }
    
    var flag: String {
        switch self {
        case .english:
            return "🇺🇸"
        case .chinese:
            return "🇨🇳"
        }
    }
}

// 语言管理器
class LanguageManager: ObservableObject {
    static let shared = LanguageManager()
    
    @Published var currentLanguage: Language = .english
    
    private let languageKey = "selected_language"
    
    private init() {
        loadLanguage()
    }
    
    // 加载保存的语言设置
    private func loadLanguage() {
        if let savedLanguage = UserDefaults.standard.string(forKey: languageKey),
           let language = Language(rawValue: savedLanguage) {
            currentLanguage = language
        } else {
            // 默认使用英文
            currentLanguage = .english
        }
    }
    
    // 切换语言
    func switchLanguage(to language: Language) {
        currentLanguage = language
        UserDefaults.standard.set(language.rawValue, forKey: languageKey)
        
        // 通知语言变化
        NotificationCenter.default.post(name: .languageChanged, object: language)
    }
    
    // 获取本地化字符串
    func localizedString(for key: String) -> String {
        let bundle = Bundle.main
        let language = currentLanguage.rawValue
        
        if let path = bundle.path(forResource: language, ofType: "lproj"),
           let languageBundle = Bundle(path: path) {
            return languageBundle.localizedString(forKey: key, value: key, table: nil)
        }
        
        // 如果找不到本地化文件，返回英文
        if let path = bundle.path(forResource: "en", ofType: "lproj"),
           let languageBundle = Bundle(path: path) {
            return languageBundle.localizedString(forKey: key, value: key, table: nil)
        }
        
        return key
    }
}

// 本地化字符串扩展
extension String {
    var localized: String {
        return LanguageManager.shared.localizedString(for: self)
    }
}

// 通知名称扩展
extension Notification.Name {
    static let languageChanged = Notification.Name("languageChanged")
}