/**
 * Database Migration
 *
 * Runs drizzle-kit migrations from the drizzle/ directory.
 * Safe to call on every startup - only applies pending migrations.
 */

import { migrate } from 'drizzle-orm/better-sqlite3/migrator';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import { existsSync } from 'node:fs';
import type { DrizzleDatabase } from './index.js';
import { createModuleLogger } from '../logger/index.js';

const log = createModuleLogger('db');

/**
 * Resolve the migrations directory relative to the package root.
 * Works both in development (src/) and after build (dist/).
 */
function getMigrationsPath(): string {
  const currentDir = dirname(fileURLToPath(import.meta.url));
  // In dev (tsx): apps/server/db/ — need 3 levels up to workspace root
  // In dist (tsc): dist/db/ — need 2 levels up to workspace root
  const upThree = join(currentDir, '..', '..', '..', 'drizzle');
  if (existsSync(upThree)) return upThree;
  return join(currentDir, '..', '..', 'drizzle');
}

/**
 * Run all pending database migrations.
 *
 * Uses drizzle-kit's migration system which tracks applied migrations
 * in a __drizzle_migrations table. Safe to call on every startup.
 *
 * @param db - Drizzle database instance
 */
export function ensureSchema(db: DrizzleDatabase): void {
  log.info('applying database migrations');
  migrate(db, { migrationsFolder: getMigrationsPath() });
  log.info('database migrations complete');
}