import Database from 'better-sqlite3';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';
import mariadb from 'mariadb';

const __dirname = dirname(fileURLToPath(import.meta.url));
const SQLITE_PATH = join(__dirname, 'data', 'hospital.db');

// MariaDB connection config
const mariaPool = mariadb.createPool({
  host: process.env.DB_HOST || '10.9.8.135',
  port: parseInt(process.env.DB_PORT || '3306'),
  user: process.env.DB_USER || 'snlavaise',
  password: process.env.DB_PASSWORD || '1123581321Rtaylor%_+',
  database: process.env.DB_NAME || 'santojanni',
  connectionLimit: 5,
});

async function migrate() {
  console.log('Starting migration from SQLite to MariaDB...');
  
  // Open SQLite database
  const sqliteDb = new Database(SQLITE_PATH);
  console.log('Connected to SQLite database');
  
  const mariaConn = await mariaPool.getConnection();
  console.log('Connected to MariaDB');
  
  try {
    // Migrate each table
    const tables = [
      'usuarios', 'pacientes', 'areas', 'camas', 'internaciones', 
      'evoluciones', 'laboratorios', 'acidosbase', 'cultivos',
      'estudiosComplementarios', 'interconsultas', 'atb', 
      'indicaciones', 'movimientos_indicaciones', 'kv'
    ];
    
    for (const table of tables) {
      console.log(`Migrating ${table}...`);
      
      // Get all data from SQLite
      const rows = sqliteDb.prepare(`SELECT * FROM ${table}`).all();
      console.log(`  Found ${rows.length} rows in ${table}`);
      
      if (rows.length === 0) continue;
      
      // Get column names from first row
      const columns = Object.keys(rows[0]);
      const placeholders = columns.map(() => '?').join(', ');
      const columnNames = columns.map(c => `\`${c}\``).join(', ');
      
      // Insert into MariaDB
      for (const row of rows) {
        const values = columns.map(col => {
          const val = row[col];
          // Handle JSON strings or special cases
          if (typeof val === 'object' && val !== null) {
            return JSON.stringify(val);
          }
          return val;
        });
        
        try {
          await mariaConn.query(
            `INSERT IGNORE INTO ${table} (${columnNames}) VALUES (${placeholders})`,
            values
          );
        } catch (err) {
          console.error(`  Error inserting row in ${table}:`, err.message);
        }
      }
      
      console.log(`  Migrated ${rows.length} rows to ${table}`);
    }
    
    console.log('Migration completed successfully!');
  } catch (err) {
    console.error('Migration failed:', err);
  } finally {
    sqliteDb.close();
    mariaConn.release();
    mariaPool.end();
  }
}

migrate();