/**
 * Database connection singleton
 */

import * as plugins from '../plugins.ts';

let dbInstance: plugins.smartdata.SmartdataDb | null = null;

/**
 * Initialize database connection
 */
export async function initDb(config: {
  mongoDbUrl: string;
  mongoDbName?: string;
}): Promise<plugins.smartdata.SmartdataDb> {
  if (dbInstance) {
    return dbInstance;
  }

  dbInstance = new plugins.smartdata.SmartdataDb({
    mongoDbUrl: config.mongoDbUrl,
    mongoDbName: config.mongoDbName || 'stackregistry',
  });

  await dbInstance.init();
  console.log('Database connected successfully');

  return dbInstance;
}

/**
 * Get database instance (must call initDb first)
 */
export function getDb(): plugins.smartdata.SmartdataDb {
  if (!dbInstance) {
    throw new Error('Database not initialized. Call initDb() first.');
  }
  return dbInstance;
}

/**
 * Close database connection
 */
export async function closeDb(): Promise<void> {
  if (dbInstance) {
    await dbInstance.close();
    dbInstance = null;
    console.log('Database connection closed');
  }
}

/**
 * Check if database is connected
 */
export function isDbConnected(): boolean {
  return dbInstance !== null;
}