accounts-frontend/packages/app/components/userbar/Userbar.tsx

import React, { Component } from 'react';
import { Link } from 'react-router-dom';
import { FormattedMessage as Message } from 'react-intl';
import { Account } from 'app/components/accounts/reducer';
import buttons from 'app/components/ui/buttons.scss';

import styles from './userbar.scss';
import LoggedInPanel from './LoggedInPanel';

export default class Userbar extends Component<{
    account: Account | null;
    guestAction: 'register' | 'login';
}> {
    static displayName = 'Userbar';

    static defaultProps = {
        guestAction: 'register',
    };

    render() {
        const { account, guestAction: actionType } = this.props;

        let guestAction: React.ReactElement;

        switch (actionType) {
            case 'login':
                guestAction = (
                    <Link to="/login" className={buttons.blue}>
                        <Message key="login" defaultMessage="Sign in" />
                    </Link>
                );
                break;
            case 'register':
            default:
                guestAction = (
                    <Link to="/register" className={buttons.blue}>
                        <Message key="register" defaultMessage="Join" />
                    </Link>
                );
                break;
        }

        return (
            <div className={styles.userbar}>
                {account ? <LoggedInPanel username={account.username} /> : guestAction}
            </div>
        );
    }
}