import React, { FC, useEffect } from 'react'
import { useSelector, useDispatch } from 'react-redux'
import { Link, useHistory } from 'react-router-dom'
import { faCheckCircle, faStopwatch, faPauseCircle } from '@fortawesome/free-solid-svg-icons'
import moment from 'moment'

import { useTheme } from '../hooks'
import { handleApiError } from '../api/errors'
import { fetchInvitations, createInvitation } from '../actions/groups'
import { getInvitations } from '../selectors/groups'
import { getFieldValue } from '../selectors/forms'

import { AppState, AppThunkDispatch } from '../types'

import PrimaryButton from '../components/controls/primary-button'
import Subtitle from '../components/subtitle'
import SelectField from '../components/controls/select-field'

interface Props {
    group: string
}

const GroupInvitations: FC<Props> = ({ group }) => {
    const theme = useTheme()
    const invitations = useSelector(getInvitations)
    const expiration = useSelector<AppState, string>(state => getFieldValue<string>(state, 'expiration', '0'))
    const limit = useSelector<AppState, string>(state => getFieldValue<string>(state, 'limit', '0'))

    const dispatch = useDispatch<AppThunkDispatch>()
    const history = useHistory()

    const handleCreateInvitation = async () => {
        try {
            await dispatch(createInvitation(moment().add(expiration, 'day').valueOf(), parseInt(limit, 10)))
            await dispatch(fetchInvitations())
        } catch (err) {
            handleApiError(err, dispatch, history)
        }
    }

    useEffect(() => {
        if (invitations.length === 0) {
            try {
                dispatch(fetchInvitations())
            } catch (err) {
                handleApiError(err, dispatch, history)
            }
        }
    }, [group])

    const expirationOptions = {
        '0': 'No Expiration',
        '1': '1 Day',
        '7': '1 Week',
        '30': '1 Month',
    }

    const limitOptions = {
        '0': 'No Limit',
        '1': '1',
        '5': '5',
        '20': '20',
    }

    return (
        <div>
            <Subtitle>Invitations</Subtitle>
            <p style={{ color: theme.text }}>Create an invitation for someone to create a new account in this Community.</p>

            <SelectField name="expiration" label="Expires" options={expirationOptions} icon={faStopwatch} />
            <SelectField name="limit" label="Uses" options={limitOptions} icon={faPauseCircle} />
            
            <PrimaryButton text="Create" icon={faCheckCircle} onClick={() => handleCreateInvitation()} />
            <br />

            {invitations.length > 0 &&
                <table>
                    <thead>
                        <tr>
                            <th>Code</th>
                            <th>Created By</th>
                            <th>Uses</th>
                            <th>Limit</th>
                            <th>Expires</th>
                            <th>Created</th>
                        </tr>
                    </thead>
                    <tbody>
                        {invitations.map(invitation => (
                            <tr key={invitation.id}>
                                <td>{invitation.id}</td>
                                <td><Link to={`/u/${invitation.user.id}`}>{invitation.user.id}</Link></td>
                                <td>{invitation.uses ?? 0}</td>
                                <td>{invitation.limit ?? 'None'}</td>
                                <td>{invitation.expiration ?? 'Never'}</td>
                                <td>{moment(invitation.created).format('MMMM Do YYYY, h:mm:ss a')}</td>
                            </tr>
                        ))}
                    </tbody>
                </table>
            }
        </div>
    )
}

export default GroupInvitations