/**
 * Configuration Parser
 * Parses EMAIL_CREDENTIALS env var and auto-discovers IMAP/SMTP settings
 */
import type { OAuth2Tokens } from './oauth2.js';
export interface ServerConfig {
    host: string;
    port: number;
    secure: boolean;
}
export interface AccountConfig {
    id: string;
    email: string;
    password: string;
    authType?: 'password' | 'oauth2';
    imap: ServerConfig;
    smtp: ServerConfig;
    oauth2?: OAuth2Tokens;
}
export type SmtpSecurity = 'tls' | 'ssl' | 'starttls' | 'none';
/**
 * Parse EMAIL_CREDENTIALS environment variable
 *
 * Supported formats:
 * - Simple: email1:password1,email2:password2
 * - Custom IMAP host: email1:password1:imap.custom.com,email2:password2
 * - Custom IMAP host + port: email:password:imap.custom.com:1993
 * - Custom IMAP + SMTP (closes #634): email:password:imap.custom.com:993:smtp.custom.com:587:starttls
 *   - SMTP host alone: email:password:imap.custom.com:993:smtp.custom.com (port 587, starttls)
 *   - SMTP host + port: email:password:imap.custom.com:993:smtp.custom.com:587 (starttls)
 *   - SMTP security keyword: `tls` / `ssl` (implicit TLS, default port 465) |
 *     `starttls` (STARTTLS upgrade, default port 587) | `none` (plain, port 25)
 * - Local IMAP proxy: email:password:localhost:1993 (the literal `localhost`
 *   is accepted as a host even though it has no dot; each account may use its
 *   own host and port)
 * - Passwords with commas are NOT supported (use env var per account instead)
 *
 * For passwords containing colons, append the host segment to disambiguate:
 *   email:password_with:colon:imap_host
 */
export declare function parseCredentials(envValue: string): Promise<AccountConfig[]>;
/**
 * Load and validate configuration from environment
 */
export declare function loadConfig(): Promise<AccountConfig[]>;
export declare function resolveAccount(accounts: AccountConfig[], query: string): AccountConfig;
/**
 * Resolve a single account, with optional filter.
 * When filter is omitted and there's exactly one account, returns it.
 * Throws AMBIGUOUS_ACCOUNT if multiple accounts match.
 */
export declare function resolveSingleAccount(accounts: AccountConfig[], accountFilter?: string): AccountConfig;
export declare function resolveAccounts(accounts: AccountConfig[], query?: string): AccountConfig[];
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