import { machineIdSync } from 'node-machine-id';

/**
 * Get consistent machine ID using node-machine-id with salt
 * This ensures the same physical machine gets the same ID across runs
 * 
 * @param {string} salt - Optional salt to use (defaults to environment variable)
 * @returns {Promise<string>} Machine ID (16-character base32)
 */
export async function getConsistentMachineId(salt = null) {
  // For server-side, use node-machine-id with salt
  const saltValue = salt || process.env.MACHINE_ID_SALT || 'endpoint-proxy-salt';
  try {
    const rawMachineId = machineIdSync();
    // Create consistent ID using salt
    const crypto = await import('crypto');
    const hashedMachineId = crypto.createHash('sha256').update(rawMachineId + saltValue).digest('hex');
    // Return only first 16 characters for brevity
    return hashedMachineId.substring(0, 16);
  } catch (error) {
    console.log('Error getting machine ID:', error);
    // Fallback to random ID if node-machine-id fails
    return crypto.randomUUID ? crypto.randomUUID() : 
      'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        const r = Math.random() * 16 | 0;
        const v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
      });
  }
}

/**
 * Get raw machine ID without hashing (for debugging purposes)
 * @returns {Promise<string>} Raw machine ID
 */
export async function getRawMachineId() {
  // For server-side, use raw node-machine-id
  try {
    return machineIdSync();
  } catch (error) {
    console.log('Error getting raw machine ID:', error);
    // Fallback to random ID if node-machine-id fails
    return crypto.randomUUID ? crypto.randomUUID() : 
      'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        const r = Math.random() * 16 | 0;
        const v = c == 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
      });
  }
}

/**
 * Check if we're running in browser or server environment
 * @returns {boolean} True if in browser, false if in server
 */
export function isBrowser() {
  return typeof window !== 'undefined';
}