content: import React from 'react';
  import PropTypes from 'prop-types';
  
  import { Button } from './Button';
  import './header.css';
  
  export const Header = ({ user, onLogin, onLogout, onCreateAccount }) => (
    <header>
      <div className="wrapper">
        <div>
          <svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
            <g fill="none" fillRule="evenodd">
              <path
                d="M10 0h12a10 10 0 0110 10v12a10 10 0 01-10 10H10A10 10 0 010 22V10A10 10 0 0110 0z"
                fill="#FFF"
              />
              <path
                d="M5.3 10.6l10.4 6v11.1l-10.4-6v-11zm11.4-6.2l9.7 5.5-9.7 5.6V4.4z"
                fill="#555AB9"
              />
              <path
                d="M27.2 10.6v11.2l-10.5 6V16.5l10.5-6zM15.7 4.4v11L6 10l9.7-5.5z"
                fill="#91BAF8"
              />
            </g>
          </svg>
          <h1>Acme</h1>
        </div>
        <div>
          {user ? (
            <Button size="small" onClick={onLogout} label="Log out" />
          ) : (
            <>
              <Button size="small" onClick={onLogin} label="Log in" />
              <Button primary size="small" onClick={onCreateAccount} label="Sign up" />
            </>
          )}
        </div>
      </div>
    </header>
  );
  
  Header.propTypes = {
    user: PropTypes.shape({}),
    onLogin: PropTypes.func.isRequired,
    onLogout: PropTypes.func.isRequired,
    onCreateAccount: PropTypes.func.isRequired,
  };
  
  Header.defaultProps = {
    user: null,
  };
  