import { Logger } from '@200systems/mf-logger';
import { DatabaseClient, DatabaseConfig } from '../interfaces/index.js';
export type DatabaseType = 'postgresql' | 'mysql';
export interface AdapterConfig extends DatabaseConfig {
    type: DatabaseType;
}
/**
 * Database Adapter that provides a unified interface for both PostgreSQL and MySQL
 * This allows easy switching between database types without changing application code
 */
export declare class DatabaseAdapter {
    private client;
    private logger;
    private dbType;
    constructor(config: AdapterConfig, logger?: Logger);
    private createPostgresClient;
    private createMySQLClient;
    /**
     * Get the database type
     */
    getDatabaseType(): DatabaseType;
    /**
     * Initialize the database connection
     */
    initialize(): Promise<void>;
    /**
     * Close the database connection
     */
    close(): Promise<void>;
    /**
     * Get the underlying database client
     * This allows access to all database-specific methods
     */
    getClient(): DatabaseClient;
    /**
     * Execute a database-agnostic query
     */
    query<T = any>(sql: string, params?: any[]): Promise<{
        rows: T[];
        rowCount: number;
    }>;
    /**
     * Execute a transaction with unified interface
     */
    transaction<T>(callback: (client: DatabaseClient) => Promise<T>): Promise<T>;
    /**
     * Health check
     */
    healthCheck(): Promise<{
        status: 'ok' | 'error';
        timestamp: Date;
        reason?: string;
    }>;
    /**
     * Check if adapter is ready
     */
    isReady(): boolean;
}
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