require('dotenv').config();
const { Client } = require('ssh2');

// Test SCP connection
async function testSCPConnection() {
  const config = {
    host: process.env.SCP_HOST,
    port: parseInt(process.env.SCP_PORT) || 22,
    username: process.env.SCP_USERNAME,
    privateKey: require('fs').readFileSync(require('path').resolve(process.env.SCP_KEY_PATH))
  };

  console.log('Testing SCP connection...');
  console.log(`Host: ${config.host}`);
  console.log(`Port: ${config.port}`);
  console.log(`Username: ${config.username}`);

  const conn = new Client();

  return new Promise((resolve, reject) => {
    conn.on('ready', () => {
      console.log('✅ SSH connection successful!');
      console.log('Now testing SCP download...');

      conn.sftp((err, sftp) => {
        if (err) {
          console.error('❌ SFTP error:', err.message);
          conn.end();
          reject(err);
          return;
        }

        const remotePath = process.env.SCP_REMOTE_PATH || '/sharemnt/ez.bak';
        console.log(`Checking remote file: ${remotePath}`);

        sftp.stat(remotePath, (err, stats) => {
          if (err) {
            console.error('❌ Cannot access remote file:', err.message);
            conn.end();
            reject(err);
          } else {
            console.log('✅ Remote file found!');
            console.log(`File size: ${(stats.size / 1024 / 1024).toFixed(2)} MB`);
            console.log(`Modified: ${stats.mtime}`);
            conn.end();
            resolve();
          }
        });
      });
    });

    conn.on('error', (err) => {
      console.error('❌ SSH connection failed:', err.message);
      console.error('Error details:', err);
      reject(err);
    });

    conn.connect(config);
  });
}

// Run test
testSCPConnection()
  .then(() => {
    console.log('\n🎉 SCP test completed successfully!');
    console.log('You can now use: node backup.js');
  })
  .catch((err) => {
    console.error('\n💥 SCP test failed!');
    console.error('Please check your SSH configuration.');
    process.exit(1);
  });