Header.js

import {
  Button,
  Container,
  Icon,
  Image,
  Menu,
  Popup,
  Responsive,
  Segment,
} from 'semantic-ui-react';
import React, { Component } from 'react';

import KSZKlogo from './images/kszk_logo.svg';
import { Link } from 'react-router-dom';
import { connect } from 'react-redux';
import { getUserData } from '../actions';

// Objects that will be converted to menu items in the render method
const menuItems = [
  {
    text: 'Főoldal',
    to: '/home',
    prefix: (
      <Image size="mini" src={KSZKlogo} style={{ marginRight: '1.5em' }} />
    ),
    permissionLevel: 0,
  },
  {
    text: 'Hírek',
    to: '/news',
    prefix: '',
    permissionLevel: 0,
  },
  {
    text: 'Köreink',
    to: '/groups',
    prefix: '',
    permissionLevel: 0,
  },
  {
    text: 'Ütemterv',
    to: '/schedule',
    prefix: '',
    permissionLevel: 1,
  },
  {
    text: 'Mentorok',
    to: '/mentors',
    prefix: '',
    permissionLevel: 2,
  },
  {
    text: 'Statisztika',
    to: '/statistics',
    prefix: '',
    permissionLevel: 3,
  },
  {
    text: 'Jelentkezések',
    to: '/applications',
    prefix: '',
    permissionLevel: 3,
  },
  {
    text: 'Házi feladatok',
    to: '/homework',
    prefix: '',
    permissionLevel: 2,
  },
];

class Header extends Component {
  constructor(props) {
    super(props);
    this.state = {
      isOpen: false,
    };
  }

  // Fetch the userData-s
  UNSAFE_componentWillMount() {
    this.props.getUserData();
  }

  // Hide the menu after clicking an item on mobile
  handleOpen = () => {
    this.setState({ isOpen: true });
  };

  handleClose = () => {
    this.setState({ isOpen: false });
  };

  renderHeader(inHeader) {
    let renderedItemNum = 0;
    let current = 0;
    let maxNum = 0;
    if (this.props.user.id) {
      maxNum = menuItems.filter(
        (item) => this.props.user.permission >= item.permissionLevel
      ).length;
    } else {
      maxNum = 3;
    }

    return (
      <Segment inverted textAlign="center" vertical>
        <Container>
          <Menu inverted secondary size="large">
            {/* Default Menu items */}
            {menuItems.map((item) => {
              if (item.permissionLevel === 0) {
                renderedItemNum += 1;
                return (
                  <Menu.Item key={Math.random()} as={Link} to={item.to}>
                    {item.prefix}
                    {item.text}
                  </Menu.Item>
                );
              }
              return null;
            })}
            {/* After default menu items */}
            {menuItems.map((item, i) => {
              if (
                this.props.user.permission >= item.permissionLevel &&
                item.permissionLevel > 0 &&
                renderedItemNum < inHeader &&
                current < i
              ) {
                renderedItemNum += 1;
                current = i;
                return (
                  <Menu.Item key={Math.random()} as={Link} to={item.to}>
                    {item.prefix}
                    {item.text}
                  </Menu.Item>
                );
              }
              return null;
            })}
            {/* Arrow menu */}
            {this.props.user.id && current + 1 < maxNum ? (
              <Popup
                flowing
                hoverable
                inverted
                trigger={
                  <Menu.Item>
                    <Icon name="angle down" size="large" />
                  </Menu.Item>
                }
                position="top center"
              >
                <Menu inverted secondary size="large">
                  {menuItems.map((item, i) =>
                    this.props.user.permission >= item.permissionLevel &&
                    item.permissionLevel > 0 &&
                    current < i ? (
                      <Menu.Item key={Math.random()} as={Link} to={item.to}>
                        {item.prefix}
                        {item.text}
                      </Menu.Item>
                    ) : null
                  )}
                </Menu>
              </Popup>
            ) : null}
            {/* Login Button */}
            <Menu.Item position="right">
              {this.props.user.id ? (
                <Button.Group>
                  <Button inverted as={Link} to="/profile">
                    Profilom
                  </Button>
                  <Button as="a" href="/api/v1/logout/" icon="sign out" />
                </Button.Group>
              ) : (
                <Button as="a" href="/api/v1/login/authsch/" inverted>
                  Bejelentkezés
                </Button>
              )}
            </Menu.Item>
          </Menu>
        </Container>
      </Segment>
    );
  }

  render() {
    return (
      <div>
        {/* Tablet, Computer, ... view */}
        <Responsive minWidth={600} maxWidth={700}>
          {this.renderHeader(3)}
        </Responsive>
        <Responsive minWidth={701} maxWidth={800}>
          {this.renderHeader(4)}
        </Responsive>
        <Responsive minWidth={801} maxWidth={1000}>
          {this.renderHeader(5)}
        </Responsive>
        <Responsive minWidth={1001} maxWidth={1100}>
          {this.renderHeader(6)}
        </Responsive>
        <Responsive minWidth={1101} maxWidth={1200}>
          {this.renderHeader(7)}
        </Responsive>
        <Responsive minWidth={1201}>{this.renderHeader(8)}</Responsive>
        {/* Mobile view */}
        <Responsive maxWidth={599}>
          <Segment inverted textAlign="center" vertical>
            <Container>
              <Menu inverted secondary size="large">
                {/* kszk logo + home link */}
                <Menu.Item as={Link} to={menuItems[0].to}>
                  {menuItems[0].prefix}
                  {menuItems[0].text}
                </Menu.Item>
                {/* Sandwich menu */}
                <Popup
                  flowing
                  hoverable
                  inverted
                  trigger={
                    <Menu.Item onClick={this.handleClose} position="right">
                      <Icon name="bars" size="large" />
                    </Menu.Item>
                  }
                  position="top center"
                  open={this.state.isOpen}
                  onOpen={this.handleOpen}
                  on="click"
                  size="huge"
                >
                  <Menu vertical inverted secondary size="large">
                    {menuItems.map((item, i) =>
                      (this.props.user.permission >= item.permissionLevel ||
                        item.permissionLevel === 0) &&
                      i > 0 ? (
                        <Menu.Item
                          onClick={this.handleClose}
                          key={Math.random()}
                          as={Link}
                          to={item.to}
                        >
                          {item.prefix}
                          {item.text}
                        </Menu.Item>
                      ) : null
                    )}
                    <Menu.Item>
                      {this.props.user.id ? (
                        <Button.Group>
                          <Button
                            onClick={this.handleClose}
                            inverted
                            as={Link}
                            to="/profile"
                          >
                            Profilom
                          </Button>
                          <Button
                            onClick={this.handleClose}
                            as="a"
                            href="/api/v1/logout/"
                            icon="sign out"
                          />
                        </Button.Group>
                      ) : (
                        <Button
                          onClick={this.handleClose}
                          as="a"
                          href="/api/v1/login/authsch/"
                          inverted
                        >
                          Bejelentkezés
                        </Button>
                      )}
                    </Menu.Item>
                  </Menu>
                </Popup>
              </Menu>
            </Container>
          </Segment>
        </Responsive>
      </div>
    );
  }
}

const mapStateToProps = ({ user }) => ({
  user,
});

export default connect(mapStateToProps, { getUserData })(Header);