import { createClient } from '@clickhouse/client';

// Create configuration object using the URL approach
const config = {
  url: process.env.CLICKHOUSE_URL || 'http://localhost:8123',
  username: process.env.CLICKHOUSE_USER || 'default',
  password: process.env.CLICKHOUSE_PASSWORD || '',
  database: process.env.CLICKHOUSE_DATABASE || 'limq'
};

// Log configuration (removing password for security)
console.log('ClickHouse config:', {
  ...config,
  password: config.password ? '****' : ''
});

// Create ClickHouse client with proper URL format
export const clickhouse = createClient(config);

// Log connection status
console.log('ClickHouse client created with URL:', config.url);

/**
 * Execute ClickHouse query and return results
 */
export async function executeQuery<T>(query: string): Promise<T[]> {
  try {
    const result = await clickhouse.query({
      query,
      format: 'JSONEachRow',
    });
    
    const data = await result.json();
    return data as T[];
  } catch (error) {
    console.error('ClickHouse query error:', error);
    throw error;
  }
}

/**
 * Execute ClickHouse query and return a single result
 */
export async function executeQuerySingle<T>(query: string): Promise<T | null> {
  const results = await executeQuery<T>(query);
  return results.length > 0 ? results[0] : null;
}