Stateful flow that collects information about the presence of users

wow.js

'use strict';

const identity = {
    'usermgmt.user.presentSwitched': event => event.user.id,
    'usermgmt.user.pauseSwitched': event => event.user.id
};

const initialState = {
    is: 'pristine',
    present: false,
    pause: false,
    presentSince: null,
    presentUntil: null,
    pauses: [],
};

const transitions = {
    pristine: {
        'usermgmt.user.presentSwitched' (flow, event) {
            flow.setState({
                present: true,
                presentSince: event.data.timestamp
            });
            flow.transitionTo('present');
        }
    },
    present: {
        'usermgmt.user.presentSwitched' (flow, event) {
            flow.setState({
                present: false,
                presentUntil: event.data.timestamp
            });
            flow.transitionTo('calculating');
        },
        'usermgmt.user.pauseSwitched' (flow, event) {
            const newPause = {pauseSince: event.data.timestamp};
            flow.setState({
                pause: true,
                pauses: [...flow.state.pauses, newPause]
            });
            flow.transitionTo('pause');
        }
    },
    pause: {
        'usermgmt.user.pauseSwitched' (flow, event) {
            const pauses = Object.create(flow.state.pauses);
            pauses[flow.state.pauses.length - 1].pauseUntil = event.data.timestamp;
            flow.setState({
                pause: false,
                pauseSince: event.data.timestamp,
                pauses
            });
            flow.transitionTo('present');
        }
    }
};

const reactions = {
    present: {
        'calculating' (flow, event, services) {
            const {app, logger} = services;

            const workDayId = 'kek';
            const from = flow.state.presentSince;
            const to = flow.state.presentUntil;
            const pauses = flow.state.pauses;

            logger.info(JSON.stringify(flow));

            app.keksing.recording().createRecording({workDayId, from, to, type: 'working'});

            flow.setState({
                present: false,
                pause: false,
                presentSince: null,
                presentUntil: null,
                pauses: [],
            });
            flow.transitionTo('pristine');
        }
    }
};

module.exports = { identity, initialState, transitions, reactions };