import Foundation

/// 国际化 — 对应Bricks的i18n系统
/// 从JSON文件加载翻译，支持语言切换
@MainActor
public final class BricksI18n: ObservableObject {
    
    /// 当前语言（2位缩写: zh, en, ja, ko）
    @Published public var locale: String = "zh"
    
    /// 翻译字典: key → translated text
    @Published public var messages: [String: String] = [:]
    
    /// 是否启用i18n
    public var enabled: Bool = true
    
    /// i18n文件基础路径
    public var basePath: String = ""
    
    public init(locale: String = "zh") {
        self.locale = locale
    }
    
    // MARK: - 加载翻译
    
    /// 从字典加载
    public func loadMessages(_ dict: [String: String]) {
        messages = dict
    }
    
    /// 从JSON字符串加载
    public func loadJSON(_ jsonString: String) {
        guard let data = jsonString.data(using: .utf8),
              let dict = try? JSONSerialization.jsonObject(with: data) as? [String: String] else { return }
        messages = dict
    }
    
    /// 从URL加载翻译文件
    public func loadFromURL(_ url: String) async {
        guard let urlObj = URL(string: url) else { return }
        do {
            let (data, _) = try await URLSession.shared.data(from: urlObj)
            if let dict = try? JSONSerialization.jsonObject(with: data) as? [String: String] {
                messages = dict
            }
        } catch {
            print("[SwiftBricks i18n] Failed to load: \(error)")
        }
    }
    
    /// 加载指定语言的i18n文件
    /// 路径格式: {basePath}/i18n/{locale}/i18n.json
    public func loadLocale(_ lang: String) async {
        locale = lang
        guard enabled else { return }
        
        let url = "\(basePath)/i18n/\(lang)/i18n.json"
        await loadFromURL(url)
    }
    
    // MARK: - 翻译
    
    /// 翻译文本（i18n_getmsgs风格）
    public func t(_ key: String) -> String {
        guard enabled else { return key }
        return messages[key] ?? key
    }
    
    /// 翻译，如果未找到则返回原文
    public func translate(_ text: String) -> String {
        t(text)
    }
    
    // MARK: - 支持的语言
    
    public static let supportedLocales = ["zh", "en", "ja", "ko"]
    
    public static func localeName(_ code: String) -> String {
        switch code {
        case "zh": return "中文"
        case "en": return "English"
        case "ja": return "日本語"
        case "ko": return "한국어"
        default: return code
        }
    }
}