/**
 * Connection manager for lazy-persistent IMAP and SMTP connections.
 *
 * - Creates connections on first use per account
 * - Reuses open connections across tool calls
 * - Auto-reconnects on failure
 * - Graceful shutdown closes all connections
 */
import type { ImapFlow } from 'imapflow';
import type { Transporter } from 'nodemailer';
import type OAuthService from '../services/oauth.service.js';
import type { AccountConfig } from '../types/index.js';
import type { IConnectionManager } from './types.js';
export default class ConnectionManager implements IConnectionManager {
    private imapClients;
    private smtpTransports;
    private accounts;
    private oauthService?;
    constructor(accounts: AccountConfig[], oauthService?: OAuthService);
    getAccount(name: string): AccountConfig;
    getAccountNames(): string[];
    getImapClient(accountName: string): Promise<ImapFlow>;
    private static buildSmtpTransportOptions;
    getSmtpTransport(accountName: string, options?: {
        verify?: boolean;
    }): Promise<Transporter>;
    verifySmtpTransport(accountName: string): Promise<void>;
    static testImap(account: AccountConfig, oauthService?: OAuthService): Promise<{
        success: boolean;
        error?: string;
        /** What to do about a rejected credential, for the caller to render. */
        hint?: string;
        details?: {
            messages: number;
            folders: number;
        };
    }>;
    static testSmtp(account: AccountConfig, oauthService?: OAuthService): Promise<{
        success: boolean;
        error?: string;
        hint?: string;
    }>;
    closeAll(): Promise<void>;
}
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