import React, { useState, useEffect } from 'react';
import ReactDOM from 'react-dom';
import {
  createMuiTheme,
  ThemeProvider,
  makeStyles
} from '@material-ui/core/styles';
import { CssBaseline } from '@material-ui/core';
import teal from '@material-ui/core/colors/teal';
import 'typeface-roboto';

import Header from './components/Header/Header';
import ProfilePage from './pages/ProfilePage/ProfilePage';
import FeedPage from './pages/FeedPage/FeedPage';
import AuthPage from './pages/AuthPage/AuthPage';
import { User, Page } from './types';
import { get } from './requests';


const theme = createMuiTheme({
  palette: {
    primary: {
      main: teal[700]
    }
  }
});

const useStyles = makeStyles({
  root: {
    width: theme.spacing(75),
    marginTop: theme.spacing(15),
    margin: '0 auto'
  }
});

const App: React.FC = () => {
  const [user, setUser] = React.useState<User | undefined>();
  const [page, setPage] = useState<Page>({ prefix: 'feed', id: '' });
  const classes = useStyles();

  const navigate = (prefix: string, id?: string): void => {
    if (prefix === 'profile' && !id && !user) setPage({
      prefix: 'auth',
      id: ''
    });
    else setPage({
      prefix,
      id: (id || user?._id || '')
    });
  };

  const logOut = () => {
    localStorage.removeItem('userId');
    setUser(undefined);
    navigate('auth');
  };

  useEffect(() => {
    const userId = localStorage.getItem('userId');
    if (userId) {
      get(`/users/${userId}`).then(response => {
        setUser(response.data);
      });
    }
  }, []);

  return (
    <ThemeProvider theme={theme}>
      <CssBaseline />
      <Header navigate={navigate} />
      <div className={classes.root}>
        { page.prefix === 'profile' && <ProfilePage logOut={logOut} id={page.id} navigate={navigate} /> }
        { page.prefix === 'feed' && <FeedPage navigate={navigate} /> }
        { page.prefix === 'auth' && <AuthPage setUser={setUser} navigate={navigate}/> }
      </div>
    </ThemeProvider>
  );
};

ReactDOM.render(<App />, document.getElementById('root'));