content: import React from 'react';
  import { makeStyles } from '@material-ui/core/styles';
  import AppBar from '@material-ui/core/AppBar';
  import Toolbar from '@material-ui/core/Toolbar';
  import Typography from '@material-ui/core/Typography';
  import IconButton from '@material-ui/core/IconButton';
  import MenuIcon from '@material-ui/icons/Menu';
  import AccountCircle from '@material-ui/icons/AccountCircle';
  import Switch from '@material-ui/core/Switch';
  import FormControlLabel from '@material-ui/core/FormControlLabel';
  import FormGroup from '@material-ui/core/FormGroup';
  import MenuItem from '@material-ui/core/MenuItem';
  import Menu from '@material-ui/core/Menu';
  
  const useStyles = makeStyles(theme => ({
    root: {
      flexGrow: 1,
    },
    menuButton: {
      marginRight: theme.spacing(2),
    },
    title: {
      flexGrow: 1,
    },
  }));
  
  export default function MenuAppBar() {
    const classes = useStyles();
    const [auth, setAuth] = React.useState(true);
    const [anchorEl, setAnchorEl] = React.useState(null);
    const open = Boolean(anchorEl);
  
    const handleChange = event => {
      setAuth(event.target.checked);
    };
  
    const handleMenu = event => {
      setAnchorEl(event.currentTarget);
    };
  
    const handleClose = () => {
      setAnchorEl(null);
    };
  
    return (
      <div className={classes.root}>
        <FormGroup>
          <FormControlLabel
            control={<Switch checked={auth} onChange={handleChange} aria-label="login switch" />}
            label={auth ? 'Logout' : 'Login'}
          />
        </FormGroup>
        <AppBar position="static">
          <Toolbar>
            <IconButton edge="start" className={classes.menuButton} color="inherit" aria-label="menu">
              <MenuIcon />
            </IconButton>
            <Typography variant="h6" className={classes.title}>
              Photos
            </Typography>
            {auth && (
              <div>
                <IconButton
                  aria-label="account of current user"
                  aria-controls="menu-appbar"
                  aria-haspopup="true"
                  onClick={handleMenu}
                  color="inherit"
                >
                  <AccountCircle />
                </IconButton>
                <Menu
                  id="menu-appbar"
                  anchorEl={anchorEl}
                  anchorOrigin={{
                    vertical: 'top',
                    horizontal: 'right',
                  }}
                  keepMounted
                  transformOrigin={{
                    vertical: 'top',
                    horizontal: 'right',
                  }}
                  open={open}
                  onClose={handleClose}
                >
                  <MenuItem onClick={handleClose}>Profile</MenuItem>
                  <MenuItem onClick={handleClose}>My account</MenuItem>
                </Menu>
              </div>
            )}
          </Toolbar>
        </AppBar>
      </div>
    );
  }
  