/**
 * Helpers functions for dealing with devices
 */
const _ = require('lodash');

const mainDB = require(global.pathPrefix + 'mainDB.js');
const mainDBP = require(global.pathPrefix + 'mainDB-promises.js');

module.exports = {
    archiveDevice
};

/**
 * Archives a copy of the device object, after appropriate anonymisation
 *
 * @param {Object} device   - The device to delete
 *
 * @returns {Promise}       - Promise for the result of archiving the device
 */
function archiveDevice(device) {
    /**
     * Store the old object _id as DeviceIndex
     */
    const archivedDevice = _.clone(device);

    archivedDevice.DeviceIndex = device._id.toString();
    delete archivedDevice._id;
    archivedDevice.DeviceAuthorisation = '';
    archivedDevice.DeviceSalt = '';
    archivedDevice.CurrentHMAC = '';
    archivedDevice.PendingHMAC = '';
    archivedDevice.LastUpdate = new Date();

    /**
     * Write the object to the Archive.
     */
    return mainDBP.addObject(mainDB.collectionDeviceArchive, archivedDevice, undefined, false);
}