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

async function testDatabaseConnection() {
  console.log('=== Database Connection Test ===');
  console.log('DATABASE_URL from .env:', process.env.DATABASE_URL);
  
  if (!process.env.DATABASE_URL) {
    console.error('❌ DATABASE_URL not found in environment variables');
    console.log('Current environment variables:');
    Object.keys(process.env).filter(key => key.includes('DATABASE')).forEach(key => {
      console.log(`${key}: ${process.env[key]}`);
    });
    return;
  }

  const client = new Client({
    connectionString: process.env.DATABASE_URL,
    ssl: false, // Set to true if your database requires SSL
  });

  try {
    console.log('🔄 Attempting to connect to database...');
    await client.connect();
    console.log('✅ Successfully connected to database!');
    
    // Test a simple query
    const result = await client.query('SELECT version()');
    console.log('📊 Database version:', result.rows[0].version);
    
    // Check if our tables exist
    const tablesResult = await client.query(`
      SELECT table_name 
      FROM information_schema.tables 
      WHERE table_schema = 'public' 
      AND table_name IN ('user_profiles', 'user_identities')
    `);
    
    console.log('📋 Found tables:', tablesResult.rows.map(row => row.table_name));
    
    if (tablesResult.rows.length === 0) {
      console.log('⚠️  No user tables found. You may need to run migrations.');
      console.log('Run: npm run migrate:up');
    }
    
  } catch (error) {
    console.error('❌ Database connection failed:', error.message);
    console.error('🔍 Error details:', {
      code: error.code,
      errno: error.errno,
      syscall: error.syscall,
      address: error.address,
      port: error.port
    });
    
    if (error.code === 'ENOTFOUND') {
      console.error('🌐 DNS resolution failed - check if the host is correct');
    } else if (error.code === 'ECONNREFUSED') {
      console.error('🚫 Connection refused - check if database server is running');
    } else if (error.code === '28P01') {
      console.error('🔐 Authentication failed - check username/password');
    } else if (error.code === '3D000') {
      console.error('🗄️  Database does not exist - check database name');
    }
  } finally {
    await client.end();
  }
}

testDatabaseConnection();