// view-group.tsx
// Copyright (C) 2020  Dwayne Harris

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

import React, { FC, useEffect, useState } from 'react'
import { useSelector, useDispatch } from 'react-redux'
import { useParams, useHistory } from 'react-router-dom'
import { faEdit, faUserCheck, faBan } from '@fortawesome/free-solid-svg-icons'
import moment from 'moment'

import { handleApiError } from '../../api/errors'
import { setTheme } from '../../actions/theme'
import { fetchGroup } from '../../actions/groups'
import { getAuthenticated } from '../../selectors/authentication'
import { getEntity } from '../../selectors/entities'
import { getThemeName } from '../../selectors/theme'

import { useDeepCompareEffect, useTheme, useSetting } from '../../hooks'
import { setTitle } from '../../utils'
import { AppState, EntityType, Group, GroupMembershipType, AppThunkDispatch, LevelItem } from '../../types'

import Title from '../../components/title'
import Level from '../../components/level'
import Section from '../../components/section'
import PrimaryButton from '../../components/controls/primary-button'
import Button from '../../components/controls/button'
import Loading from '../../components/pages/loading'
import HorizontalRule from '../../components/horizontal-rule'

interface Params {
    id: string
}

const ViewGroup: FC = () => {
    const { id } = useParams<Params>()
    const theme = useTheme()
    const themeName = useSelector(getThemeName)
    const [selectedThemeName] = useState(themeName)
    const group = useSelector<AppState, Group | undefined>(state => getEntity<Group>(state, EntityType.Group, id))
    const authenticated = useSelector(getAuthenticated)
    const dispatch = useDispatch<AppThunkDispatch>()
    const history = useHistory()
    const allowThemeChange = useSetting<boolean>('allowThemeChange', true)

    useEffect(() => {
        try {
            dispatch(fetchGroup(id))
        } catch (err) {
            handleApiError(err, dispatch, history)
        }
    }, [])

    useDeepCompareEffect(() => {
        if (group) {
            setTitle(group.name)
            if (allowThemeChange) dispatch(setTheme(group.theme))
        }

        return () => {
            if (allowThemeChange) dispatch(setTheme(selectedThemeName))
        }
    }, [group])

    if (!group) return <Loading />

    const isAdmin = group.membership === GroupMembershipType.Admin
    const isMember = !!group.membership

    const items: LevelItem[] = []
    items.push({
        label: 'Members',
        content: group.members,
    })
    items.push({
        label: 'Posts',
        content: group.posts,
    })
    items.push({
        label: 'Awards',
        content: group.awards,
    })
    items.push({
        label: 'Points',
        content: group.points,
    })
    items.push({
        label: 'Created',
        content: moment(group.updated).format('MMMM Do, YYYY'),
    })

    return (
        <div>
            <Section>
                {group.coverImageUrl &&
                    <div className="cover-image">
                        <img src={group.coverImageUrl} />
                    </div>
                }

                <div className="header">
                    {group.imageUrl &&
                        <div className="image">
                            <img src={group.imageUrl} />
                        </div>
                    }
                    <div>
                        <Title>{group.name}</Title>
                        <p style={{ color: theme.text }}>{group.about}</p>
                    </div>
                </div>
                
                <Level items={items} />
                <HorizontalRule />

                <div className="buttons">
                    {!authenticated &&
                        <PrimaryButton text="Create an Account" icon={faUserCheck} onClick={() => history.push(`/c/${group.id}/register`)} />
                    }

                    {!isMember &&
                        <Button text="Block" icon={faBan} onClick={() => history.push(`/c/${group.id}/register`)} color={theme.backgroundPrimary} backgroundColor={theme.red} />
                    }

                    {isAdmin &&
                        <PrimaryButton text={`Edit ${group.name}`} icon={faEdit} onClick={() => history.push(`/c/${group.id}/admin/`)} />
                    }
                </div>
            </Section>
        </div>
    )
}

export default ViewGroup