import type { DatabaseStore } from '../../store/database-store.js';
import type { DatabaseAccount, DatabaseUser } from '../../types/index.js';
export interface UserAccountPair {
    user: DatabaseUser;
    account: DatabaseAccount;
}
/**
 * Resolves user and account together with smart fallback logic for account selection.
 * Priority for account selection:
 * 1. Preferred login method (parameter)
 * 2. user.lastLoginMethod
 * 3. user.firstLoginMethod
 * 4. Fallback to getAccountByUserId() (latest account)
 */
export declare class UserAccountResolver {
    private readonly store;
    private readonly logger;
    constructor(store: DatabaseStore);
    /**
     * Resolves user and account by user ID.
     * Returns null if user not found or no account exists.
     */
    resolveByUserId(userId: string, preferredLoginMethod?: string): Promise<UserAccountPair | null>;
    /**
     * Resolves user and account by email.
     * Returns null if user not found or no account exists.
     */
    resolveByEmail(email: string, preferredLoginMethod?: string): Promise<UserAccountPair | null>;
    /**
     * Resolves the best account for a user with priority:
     * 1. preferredLoginMethod parameter
     * 2. user.lastLoginMethod from DB
     * 3. user.firstLoginMethod from DB
     * 4. Fallback to getAccountByUserId() (latest account)
     *
     * Falls back to the latest account if the preferred provider is unavailable.
     */
    private resolveAccountForUser;
}
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