/**
 * Database Schema Initialization
 * 
 * Ensures normalized EAV schema is initialized before services use it.
 */

import { getDatabaseAdapter } from './singleton.js';
import { NORMALIZED_SCHEMA_POSTGRES, NORMALIZED_SCHEMA_SQLITE } from './normalized-schema.js';
import { logger } from '../logger.js';

let initialized = false;
let initializationPromise: Promise<void> | null = null;

/**
 * Ensure database schema is initialized
 */
export async function ensureSchemaInitialized(): Promise<void> {
  if (initialized) return;
  if (initializationPromise) {
    await initializationPromise;
    return;
  }

  initializationPromise = (async () => {
    try {
      // Use shared database adapter singleton
      const db = getDatabaseAdapter();
      const isPostgres = db.isPostgres === true;

      // Execute schema
      const schema = isPostgres ? NORMALIZED_SCHEMA_POSTGRES : NORMALIZED_SCHEMA_SQLITE;
      await db.exec(schema);

      logger.info(`Database schema initialized (${isPostgres ? 'PostgreSQL' : 'SQLite'})`);
      initialized = true;
    } catch (error) {
      logger.error('Failed to initialize database schema', error);
      throw error;
    }
  })();

  await initializationPromise;
}