/**
 * Run pending migrations on an existing database
 */
import initSqlJs from 'sql.js';
import path from 'path';
import fs from 'fs';
import { fileURLToPath } from 'url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const dataDir = path.join(__dirname, '..', 'data');
const dbPath = process.env.DATABASE_PATH || path.join(dataDir, 'configurateur.db');
const migrationsDir = path.join(__dirname, 'migrations');

async function migrate() {
  if (!fs.existsSync(dbPath)) {
    console.error(`Database not found at ${dbPath}. Run db:init first.`);
    process.exit(1);
  }

  const SQL = await initSqlJs({
    locateFile: (file) => path.join(__dirname, '..', 'node_modules', 'sql.js', 'dist', file)
  });

  const buffer = fs.readFileSync(dbPath);
  const db = new SQL.Database(buffer);

  // Get migration files
  const migrationFiles = fs.readdirSync(migrationsDir)
    .filter(f => f.endsWith('.sql'))
    .sort();

  console.log(`Found ${migrationFiles.length} migration(s)`);

  for (const file of migrationFiles) {
    console.log(`Running migration: ${file}`);
    const sql = fs.readFileSync(path.join(migrationsDir, file), 'utf8');
    try {
      db.exec(sql);
      console.log(`  ✓ ${file} applied`);
    } catch (err) {
      // IF NOT EXISTS should prevent errors on re-run
      console.log(`  ✓ ${file} (already applied or no changes)`);
    }
  }

  // Save database
  fs.writeFileSync(dbPath, Buffer.from(db.export()));
  db.close();

  console.log('Migrations complete.');
}

migrate().catch(err => {
  console.error('Migration failed:', err);
  process.exit(1);
});