bbgo_origin/frontend/pages/index.tsx

import React, {useState} from 'react';
import { useRouter } from 'next/router';

import {makeStyles} from '@material-ui/core/styles';
import Typography from '@material-ui/core/Typography';
import Box from '@material-ui/core/Box';
import Grid from '@material-ui/core/Grid';
import Paper from '@material-ui/core/Paper';

import TotalAssetsPie from '../components/TotalAssetsPie';
import TotalAssetSummary from '../components/TotalAssetsSummary';

import TradingVolumePanel from '../components/TradingVolumePanel';
import ExchangeSessionTabPanel from '../components/ExchangeSessionTabPanel';

import DashboardLayout from '../layouts/DashboardLayout';

import {querySessions} from "../api/bbgo";

const useStyles = makeStyles((theme) => ({
    paper: {
        height: 140,
        width: 200,
    },
    totalAssetsBox: {
        height: 300,
    },
    totalAssetsSummary: {
        padding: theme.spacing(2),
    },
    control: {
        padding: theme.spacing(2),
    },
}));



// props are pageProps passed from _app.tsx
export default function Home() {
    const classes = useStyles();
    const { push } = useRouter();

    const [sessions, setSessions] = React.useState([])

    React.useEffect(() => {
        querySessions((sessions) => {
            if (sessions.length == 0) {
                push("/setup");
            } else {
                setSessions(sessions)
            }
        }).catch((err) => {
            console.error(err);
        })
    }, [])

    if (sessions.length == 0) {
        return (
            <DashboardLayout>
                <Box m={4}>
                    <Typography variant="h4" component="h2" gutterBottom>
                        Loading
                    </Typography>
                </Box>
            </DashboardLayout>
        );
    }

    return (
        <DashboardLayout>
            <Box m={4}>
                <Paper className={classes.totalAssetsSummary}>
                    <Typography variant="h4" component="h2" gutterBottom>
                        Total Assets
                    </Typography>

                    <Grid container spacing={3}>
                        <Grid item xs={12} md={6}>
                            <TotalAssetSummary/>
                        </Grid>

                        <Grid item xs={12} md={6}>
                            <Box className={classes.totalAssetsBox}>
                                <TotalAssetsPie/>
                            </Box>
                        </Grid>
                    </Grid>
                </Paper>

                <TradingVolumePanel/>

                <ExchangeSessionTabPanel/>
            </Box>
        </DashboardLayout>
    );
}