/**
 * Database Adapter Singleton
 * 
 * Provides a shared database adapter instance to prevent multiple connections.
 * All services should use this singleton instead of creating their own adapters.
 */

import { createDatabaseAdapter } from './factory.js';
import type { DatabaseAdapter } from './interface.js';

let dbAdapterInstance: DatabaseAdapter | null = null;

/**
 * Get the shared database adapter instance
 */
export function getDatabaseAdapter(): DatabaseAdapter {
  if (!dbAdapterInstance) {
    dbAdapterInstance = createDatabaseAdapter(undefined, undefined, false); // Don't allow close (singleton)
  }
  return dbAdapterInstance;
}

/**
 * Reset the singleton (for testing only)
 */
export function resetDatabaseAdapter(): void {
  dbAdapterInstance = null;
}