const DEFAULT_JWT_SECRET = 'default-jwt-secret';
const DEFAULT_REFRESH_SECRET = 'default-refresh-secret';
const DEFAULT_DB_PASSWORD = 'cloudhost_secret';

export function validateProductionConfig(): void {
  if (process.env.NODE_ENV !== 'production') {
    return;
  }

  const errors: string[] = [];

  const jwtSecret = process.env.JWT_SECRET || DEFAULT_JWT_SECRET;
  const refreshSecret = process.env.JWT_REFRESH_SECRET || DEFAULT_REFRESH_SECRET;
  const dbPassword = process.env.DB_PASSWORD || DEFAULT_DB_PASSWORD;

  if (!process.env.JWT_SECRET || jwtSecret === DEFAULT_JWT_SECRET) {
    errors.push('JWT_SECRET must be set to a strong random value in production');
  }
  if (!process.env.JWT_REFRESH_SECRET || refreshSecret === DEFAULT_REFRESH_SECRET) {
    errors.push('JWT_REFRESH_SECRET must be set to a strong random value in production');
  }
  if (!process.env.DB_PASSWORD || dbPassword === DEFAULT_DB_PASSWORD) {
    errors.push('DB_PASSWORD must be changed from the default in production');
  }
  if (!process.env.CLUSTER_KUBECONFIG_KEY?.trim()) {
    errors.push('CLUSTER_KUBECONFIG_KEY must be set in production to encrypt stored kubeconfigs');
  }
  // Elastic log-stack credentials must not fall back to the well-known dev defaults.
  const elasticDefaults = ['CloudHost2024!Secure', 'FluentBit2024!Writer', 'Kibana2024!System'];
  if (!process.env.ELASTIC_PASSWORD || elasticDefaults.includes(process.env.ELASTIC_PASSWORD)) {
    errors.push('ELASTIC_PASSWORD must be set to a strong random value in production');
  }
  if (process.env.FLUENTBIT_PASSWORD && elasticDefaults.includes(process.env.FLUENTBIT_PASSWORD)) {
    errors.push('FLUENTBIT_PASSWORD must be changed from the default in production');
  }

  if (errors.length > 0) {
    throw new Error(
      `Production configuration validation failed:\n${errors.map((e) => `  - ${e}`).join('\n')}`,
    );
  }
}