import { networkInterfaces } from 'os';
import { createHash, randomBytes } from 'crypto';

/**
 * Check to see if the input is a valid JSON string
 * 
 * @param {*} str The string to check for valud JSON
 * @returns {true|false}
 */
export function isJsonString (str) {
    try {
        JSON.parse(str);
    } catch (e) {
        return false;
    }
    return true;
}


/**
 * Generate a unique ID for a given device, this will also be unique on the same device at a different time. 
 * @returns {string} A generated unique ID
 */
export function generateUniqueID () {
    const netInterfaces = networkInterfaces();
    let macAddress = '';

    // Find the first non-internal MAC address
    for (const key in netInterfaces) {
        const iface = netInterfaces[key][0];
        if (!iface.internal) {
            macAddress = iface.mac;
            break;
        }
    }

    // If no non-internal MAC address is found, fallback to a random value
    if (!macAddress) {
        macAddress = randomBytes(6).toString('hex').toUpperCase();
    }

    // Use MAC address and current timestamp to create a unique ID
    const timestamp = Date.now();
    const uniqueID = createHash('sha256')
        .update(macAddress + timestamp)
        .digest('hex');

    return uniqueID;
}