import React, { FC, useEffect } from 'react'
import { useSelector } from 'react-redux'
import { Link, useHistory } from 'react-router-dom'
import { useTheme, useAuthenticationCheck } from '../../hooks'
import { getAuthenticatedUser, getChecked } from '../../selectors/authentication'
import { setTitle } from '../../utils'

import Section from '../../components/section'
import Title from '../../components/title'
import HorizontalRule from '../../components/horizontal-rule'
import Loading from '../../components/pages/loading'

const Admin: FC = () => {
    useAuthenticationCheck()
    const checked = useSelector(getChecked)
    const theme = useTheme()
    const user = useSelector(getAuthenticatedUser)
    const history = useHistory()

    useEffect(() => {
        setTitle('Admin')
    })

    if (!user) return <Loading />
    if (checked && !user.admin) history.push('/')
    
    return (
        <Section>
            <Title>Admin</Title>

            <HorizontalRule />
            <br /><br />

            <Link style={{ color: theme.secondary }} to="/admin/groups">Approve Pending Groups</Link>
            <br />

            <Link style={{ color: theme.secondary }} to="/admin/apps">Approve Pending Apps</Link>
            <br />
        </Section>
    )
}

export default Admin
