import React, { FC, useEffect } from 'react'
import { useSelector, useDispatch } from 'react-redux'
import { useHistory } from 'react-router-dom'
import { useAuthenticationCheck, useTheme } from '../../hooks'
import { fetchPendingGroups, activateGroup } from '../../actions/groups'
import { getAuthenticatedUser, getChecked } from '../../selectors/authentication'
import { getPendingGroups } from '../../selectors/groups'
import { handleApiError } from '../../api/errors'
import { setTitle } from '../../utils'
import { AppThunkDispatch } from '../../types'

import Section from '../../components/section'
import Title from '../../components/title'
import Loading from '../../components/pages/loading'
import GroupListItem from '../../components/group-list-item'
import HorizontalRule from '../../components//horizontal-rule'
import PrimaryButton from '../../components/controls/primary-button'

const AdminGroups: FC = () => {
    useAuthenticationCheck()
    const theme = useTheme()
    const checked = useSelector(getChecked)
    const user = useSelector(getAuthenticatedUser)
    const groups = useSelector(getPendingGroups)
    const dispatch = useDispatch<AppThunkDispatch>()
    const history = useHistory()

    const handleClick = async (id: string) => {
        try {
            await dispatch(activateGroup(id))
            await dispatch(fetchPendingGroups())
        } catch (err) {
            handleApiError(err, dispatch, history)
        }
    }

    useEffect(() => {
        setTitle('Admin \\ Groups')

        const init = async () => {
            try {
                await dispatch(fetchPendingGroups())
            } catch (err) {
                handleApiError(err, dispatch, history)
            }
        }

        if (checked) init()
    }, [checked])

    if (!user) return <Loading />
    if (checked && !user.admin) history.push('/')
    
    return (
        <div>
            <Section>
                <Title>Pending Groups</Title>
                <HorizontalRule />
            </Section>

            {groups.map(group => (
                <div className="list-item" style={{ borderColor: theme.backgroundSecondary }} key={group.id}>
                    <GroupListItem group={group} />
                    <PrimaryButton text="Activate" onClick={() => handleClick(group.id)} />
                </div>
            ))}
        </div>
    )
}

export default AdminGroups