/**
 * Telegram 平台适配器
 *
 * 使用 grammy 库实现 PlatformAdapter 接口
 * 支持 Long Polling 模式连接 Telegram Bot API
 * 支持附件下载：photo、document、video、audio
 */
import type { Bot } from 'grammy';
import type { PlatformAdapter, PlatformSender, PlatformMessageEvent, PlatformActionEvent } from '../types.js';
/**
 * Telegram 平台适配器实现
 */
export declare class TelegramAdapter implements PlatformAdapter {
    readonly platform: "telegram";
    private readonly sender;
    private readonly messageCallbacks;
    private readonly actionCallbacks;
    private readonly messageConversationMap;
    private bot;
    private isActive;
    private botUsername;
    constructor();
    getBot(): Bot | null;
    start(): Promise<void>;
    stop(): void;
    getSender(): PlatformSender;
    onMessage(callback: (event: PlatformMessageEvent) => void): void;
    onAction(callback: (event: PlatformActionEvent) => void): void;
    isAdapterActive(): boolean;
    getConversationByMessageId(messageId: string): string | undefined;
    rememberMessageConversation(messageId: string, conversationId: string): void;
    forgetMessageConversation(messageId: string): void;
    forgetConversationMessages(conversationId: string): void;
    /**
     * 通过 file_id 下载 Telegram 文件
     * @param fileId Telegram 文件 ID
     * @returns 文件内容和元信息，或 null 表示下载失败
     */
    downloadFile(fileId: string): Promise<{
        buffer: Buffer;
        fileName: string;
        mimeType: string;
    } | null>;
    /**
     * 从消息中提取附件信息
     * 支持 photo、document、video、audio 类型
     */
    private extractAttachmentFromMessage;
    /**
     * 确定消息类型
     */
    private determineMessageType;
    /**
     * 处理消息事件
     */
    private handleMessage;
    /**
     * 处理回调查询事件（按钮点击）
     */
    private handleCallbackQuery;
}
export declare const telegramAdapter: TelegramAdapter;
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