1import React from 'react';
  2import { Link, useLocation } from 'react-router-dom';
  3
  4import AppBar from '@material-ui/core/AppBar';
  5import Tab, { TabProps } from '@material-ui/core/Tab';
  6import Tabs from '@material-ui/core/Tabs';
  7import Toolbar from '@material-ui/core/Toolbar';
  8import Tooltip from '@material-ui/core/Tooltip/Tooltip';
  9import { makeStyles } from '@material-ui/core/styles';
 10
 11import CurrentIdentity from '../CurrentIdentity/CurrentIdentity';
 12import { LightSwitch } from '../Themer';
 13
 14const useStyles = makeStyles((theme) => ({
 15  offset: {
 16    ...theme.mixins.toolbar,
 17  },
 18  filler: {
 19    flexGrow: 1,
 20  },
 21  appBar: {
 22    backgroundColor: theme.palette.primary.dark,
 23    color: theme.palette.primary.contrastText,
 24  },
 25  appTitle: {
 26    ...theme.typography.h6,
 27    color: theme.palette.primary.contrastText,
 28    textDecoration: 'none',
 29    display: 'flex',
 30    alignItems: 'center',
 31  },
 32  lightSwitch: {
 33    padding: '0 20px',
 34  },
 35  logo: {
 36    height: '42px',
 37    marginRight: theme.spacing(2),
 38  },
 39}));
 40
 41function a11yProps(index: any) {
 42  return {
 43    id: `nav-tab-${index}`,
 44    'aria-controls': `nav-tabpanel-${index}`,
 45  };
 46}
 47
 48const DisabledTabWithTooltip = (props: TabProps) => {
 49  /*The span elements around disabled tabs are needed, as the tooltip
 50   * won't be triggered by disabled elements.
 51   * See: https://material-ui.com/components/tooltips/#disabled-elements
 52   * This must be done in a wrapper component, otherwise the TabS component
 53   * cannot pass it styles down to the Tab component. Resulting in (console)
 54   * warnings. This wrapper acceps the passed down TabProps and pass it around
 55   * the span element to the Tab component.
 56   */
 57  const msg = `This feature doesn't exist yet. Come help us build it.`;
 58  return (
 59    <Tooltip title={msg}>
 60      <span>
 61        <Tab disabled {...props} />
 62      </span>
 63    </Tooltip>
 64  );
 65};
 66
 67function Header() {
 68  const classes = useStyles();
 69  const location = useLocation();
 70  const [selectedTab, setTab] = React.useState(location.pathname);
 71
 72  const handleTabClick = (
 73    event: React.ChangeEvent<{}>,
 74    newTabValue: string
 75  ) => {
 76    setTab(newTabValue);
 77  };
 78
 79  return (
 80    <>
 81      <AppBar position="fixed" className={classes.appBar}>
 82        <Toolbar>
 83          <Link to="/" className={classes.appTitle}>
 84            <img src="/logo.svg" className={classes.logo} alt="git-bug logo" />
 85            git-bug
 86          </Link>
 87          <div className={classes.filler} />
 88          <div className={classes.lightSwitch}>
 89            <LightSwitch />
 90          </div>
 91          <CurrentIdentity />
 92        </Toolbar>
 93      </AppBar>
 94      <div className={classes.offset} />
 95      <Tabs
 96        centered
 97        value={selectedTab}
 98        onChange={handleTabClick}
 99        aria-label="nav tabs"
100      >
101        <DisabledTabWithTooltip label="Code" value="/code" {...a11yProps(1)} />
102        <Tab label="Bugs" value="/" component={Link} to="/" {...a11yProps(2)} />
103        <DisabledTabWithTooltip
104          label="Pull Requests"
105          value="/pulls"
106          {...a11yProps(3)}
107        />
108        <DisabledTabWithTooltip
109          label="Settings"
110          value="/settings"
111          {...a11yProps(4)}
112        />
113      </Tabs>
114    </>
115  );
116}
117
118export default Header;