// Environment variable names for API key
export const API_KEY_ENV_VARS = ['AIML_API_KEY'];
export const BASE_URL_ENV_VARS = ['AIML_API_BASE'];

// SDK identification headers
export const AIMLAPI_HEADERS = {
  'HTTP-Referer': 'github.com/aimlapi/aimlapi-sdk-node',
  'X-Title': 'AI/ML API Node SDK (OpenAI)',
} as const;

/**
 * Get the first non-empty value from environment variables
 */
export function getEnv(...names: string[]): string | undefined {
  for (const name of names) {
    const value = process.env[name];
    if (value && value !== '') {
      return value;
    }
  }
  return undefined;
}

/**
 * Check if a value is a valid Uploadable type
 */
export function isUploadable(value: unknown): boolean {
  if (value instanceof Uint8Array || value instanceof ArrayBuffer) {
    return true;
  }
  if (typeof value === 'string') {
    return true;
  }
  if (
    value !== null &&
    typeof value === 'object' &&
    'stream' in value &&
    typeof (value as { stream: unknown }).stream === 'object'
  ) {
    return true;
  }
  return false;
}