webapp/src/components/Views/Feed/Feed.tsx

import { clsx } from 'clsx'
import { For, Show, createEffect, createMemo, createSignal, on, onMount } from 'solid-js'

import { Meta } from '@solidjs/meta'
import { A, useLocation, useSearchParams } from '@solidjs/router'
import { useGraphQL } from '~/context/graphql'
import { useUI } from '~/context/ui'
import getUnratedShoutsQuery from '~/graphql/query/core/articles-load-unrated'
import { useAuthors } from '../../../context/authors'
import { useFeed } from '../../../context/feed'
import { useLocalize } from '../../../context/localize'
import { useReactions } from '../../../context/reactions'
import { useSession } from '../../../context/session'
import { useTopics } from '../../../context/topics'
import type { Author, LoadShoutsOptions, Reaction, Shout } from '../../../graphql/schema/core.gen'
import { getImageUrl } from '../../../utils/getImageUrl'
import { byCreated } from '../../../utils/sortby'
import { CommentDate } from '../../Article/CommentDate'
import { getShareUrl } from '../../Article/SharePopup'
import { AuthorBadge } from '../../Author/AuthorBadge'
import { AuthorLink } from '../../Author/AuthorLink'
import { ArticleCard } from '../../Feed/ArticleCard'
import stylesBeside from '../../Feed/Beside.module.scss'
import stylesTopic from '../../Feed/CardTopic.module.scss'
import { Placeholder } from '../../Feed/Placeholder'
import { Sidebar } from '../../Feed/Sidebar'
import { Modal } from '../../Nav/Modal'
import { DropDown } from '../../_shared/DropDown'
import { Icon } from '../../_shared/Icon'
import { InviteMembers } from '../../_shared/InviteMembers'
import { Loading } from '../../_shared/Loading'
import { ShareModal } from '../../_shared/ShareModal'
import styles from './Feed.module.scss'

export const FEED_PAGE_SIZE = 20
const UNRATED_ARTICLES_COUNT = 5

type FeedPeriod = 'week' | 'month' | 'year'
type VisibilityMode = 'all' | 'community' | 'featured'

type PeriodItem = {
  value: FeedPeriod
  title: string
}

type VisibilityItem = {
  value: VisibilityMode
  title: string
}

type FeedSearchParams = {
  by: 'publish_date' | 'likes' | 'last_comment'
  period: FeedPeriod
  visibility: VisibilityMode
}

type Props = {
  loadShouts: (options: LoadShoutsOptions) => Promise<{
    hasMore: boolean
    newShouts: Shout[]
  }>
}

const getFromDate = (period: FeedPeriod): number => {
  const now = new Date()
  let d: Date = now
  switch (period) {
    case 'week': {
      d = new Date(now.setDate(now.getDate() - 7))
      break
    }
    case 'month': {
      d = new Date(now.setMonth(now.getMonth() - 1))
      break
    }
    case 'year': {
      d = new Date(now.setFullYear(now.getFullYear() - 1))
      break
    }
  }
  return Math.floor(d.getTime() / 1000)
}

export const FeedView = (props: Props) => {
  const { t } = useLocalize()

  const monthPeriod: PeriodItem = { value: 'month', title: t('This month') }

  const periods: PeriodItem[] = [
    { value: 'week', title: t('This week') },
    monthPeriod,
    { value: 'year', title: t('This year') }
  ]

  const visibilities: VisibilityItem[] = [
    { value: 'community', title: t('All') },
    { value: 'featured', title: t('Published') }
  ]
  const { query } = useGraphQL()
  const [searchParams, changeSearchParams] = useSearchParams<FeedSearchParams>()
  const loc = useLocation()
  const { showModal } = useUI()
  const [isLoading, setIsLoading] = createSignal(false)
  const [isRightColumnLoaded, setIsRightColumnLoaded] = createSignal(false)
  const { session } = useSession()
  const { loadReactionsBy } = useReactions()
  const { sortedFeed } = useFeed()
  const { topTopics } = useTopics()
  const { topAuthors } = useAuthors()
  const [isLoadMoreButtonVisible, setIsLoadMoreButtonVisible] = createSignal(false)
  const [topComments, setTopComments] = createSignal<Reaction[]>([])
  const [unratedArticles, setUnratedArticles] = createSignal<Shout[]>([])
  const [_searchResults, setSearchResults] = createSignal<Shout[]>([])

  const currentPeriod = createMemo(() => {
    const period = periods.find((p) => p.value === searchParams?.period)
    if (!period) {
      return monthPeriod
    }
    return period
  })

  const currentVisibility = createMemo(() => {
    const visibility = visibilities.find((v) => v.value === searchParams?.visibility)
    if (!visibility) {
      return visibilities[0]
    }
    return visibility
  })

  const loadUnratedArticles = async () => {
    if (session()) {
      const resp = await query(getUnratedShoutsQuery, { limit: UNRATED_ARTICLES_COUNT }).toPromise()
      setUnratedArticles(resp?.data?.load_shouts_unrated || [])
    }
  }

  const loadTopComments = async () => {
    const comments = await loadReactionsBy({ by: { comment: true }, limit: 50 })
    setTopComments(comments.sort(byCreated).reverse())
  }

  onMount(() => {
    loadMore()
    // eslint-disable-next-line promise/catch-or-return
    Promise.all([loadTopComments()]).finally(() => setIsRightColumnLoaded(true))
  })

  createEffect(
    on(
      [() => session(), unratedArticles],
      ([s, seen]) => {
        if (s?.access_token && !(seen?.length > 0)) loadUnratedArticles()
      },
      { defer: true }
    )
  )

  // TODO: declare some details
  createEffect(
    on(
      () => searchParams,
      (_p) => {
        setSearchResults([])
        loadMore()
      },
      { defer: true }
    )
  )

  const loadFeedShouts = () => {
    const options: LoadShoutsOptions = {
      limit: FEED_PAGE_SIZE,
      offset: sortedFeed()?.length || 0
    }

    if (searchParams?.by) {
      options.order_by = searchParams?.by
    }

    const visibilityMode = searchParams?.visibility

    if (visibilityMode === 'all') {
      options.filters = { ...options.filters }
    } else if (visibilityMode) {
      options.filters = {
        ...options.filters,
        featured: visibilityMode === 'featured'
      }
    }

    if (searchParams?.by && searchParams?.by !== 'publish_date') {
      const period = searchParams?.period || 'month'
      options.filters = { after: getFromDate(period) }
    }

    return props.loadShouts(options)
  }

  const loadMore = async () => {
    setIsLoading(true)
    const { hasMore, newShouts } = await loadFeedShouts()

    setIsLoading(false)

    loadReactionsBy({
      by: {
        shouts: newShouts.map((s) => s.slug)
      }
    })

    setIsLoadMoreButtonVisible(hasMore)
  }

  const ogImage = getImageUrl('production/image/logo_image.png')
  const description = t(
    'Independent media project about culture, science, art and society with horizontal editing'
  )
  const ogTitle = t('Feed')

  const [shareData, setShareData] = createSignal<Shout | undefined>()
  const handleShare = (shared: Shout | undefined) => {
    showModal('share')
    setShareData(shared)
  }

  return (
    <div class="wide-container feed">
      <Meta name="descprition" content={description} />
      <Meta name="keywords" content={t('keywords')} />
      <Meta name="og:type" content="article" />
      <Meta name="og:title" content={ogTitle} />
      <Meta name="og:image" content={ogImage} />
      <Meta name="twitter:image" content={ogImage} />
      <Meta name="og:description" content={description} />
      <Meta name="twitter:card" content="summary_large_image" />
      <Meta name="twitter:title" content={ogTitle} />
      <Meta name="twitter:description" content={description} />
      <div class="row">
        <div class={clsx('col-md-5 col-xl-4', styles.feedNavigation)}>
          <Sidebar />
        </div>

        <div class="col-md-12 offset-xl-1">
          <Show when={!session() && loc?.pathname !== 'feed'}>
            <Placeholder type={loc?.pathname} mode="feed" />
          </Show>

          <Show when={(session() || loc?.pathname === 'feed') && sortedFeed().length}>
            <div class={styles.filtersContainer}>
              <ul class={clsx('view-switcher', styles.feedFilter)}>
                <li
                  class={clsx({
                    'view-switcher__item--selected':
                      searchParams?.by === 'publish_date' || !searchParams?.by
                  })}
                >
                  <A href={loc.pathname}>{t('Recent')}</A>
                </li>
                {/*<li>*/}
                {/*  <a href="/feed/?by=views">{t('Most read')}</a>*/}
                {/*</li>*/}
                <li
                  class={clsx({
                    'view-switcher__item--selected': searchParams?.by === 'likes'
                  })}
                >
                  <span class="link" onClick={() => changeSearchParams({ by: 'likes' })}>
                    {t('Top rated')}
                  </span>
                </li>
                <li
                  class={clsx({
                    'view-switcher__item--selected': searchParams?.by === 'last_comment'
                  })}
                >
                  <span class="link" onClick={() => changeSearchParams({ by: 'last_comment' })}>
                    {t('Most commented')}
                  </span>
                </li>
              </ul>
              <div class={styles.dropdowns}>
                <Show when={searchParams?.by && searchParams?.by !== 'publish_date'}>
                  <DropDown
                    popupProps={{ horizontalAnchor: 'right' }}
                    options={periods}
                    currentOption={currentPeriod()}
                    triggerCssClass={styles.periodSwitcher}
                    onChange={(period: PeriodItem) => changeSearchParams({ period: period.value })}
                  />
                </Show>
                <DropDown
                  popupProps={{ horizontalAnchor: 'right' }}
                  options={visibilities}
                  currentOption={currentVisibility()}
                  triggerCssClass={styles.periodSwitcher}
                  onChange={(visibility: VisibilityItem) =>
                    changeSearchParams({ visibility: visibility.value })
                  }
                />
              </div>
            </div>

            <Show when={!isLoading()} fallback={<Loading />}>
              <Show when={sortedFeed().length > 0}>
                <For each={sortedFeed().slice(0, 4)}>
                  {(article) => (
                    <ArticleCard
                      onShare={(shared) => handleShare(shared)}
                      onInvite={() => showModal('inviteMembers')}
                      article={article}
                      settings={{ isFeedMode: true }}
                      desktopCoverSize="M"
                    />
                  )}
                </For>

                <div class={styles.asideSection}>
                  <div class={stylesBeside.besideColumnTitle}>
                    <h4>{t('Popular authors')}</h4>
                    <a href="/authors">
                      {t('All authors')}
                      <Icon name="arrow-right" class={stylesBeside.icon} />
                    </a>
                  </div>

                  <ul class={stylesBeside.besideColumn}>
                    <For each={topAuthors().slice(0, 5)}>
                      {(author) => (
                        <li>
                          <AuthorBadge author={author} />
                        </li>
                      )}
                    </For>
                  </ul>
                </div>

                <For each={sortedFeed().slice(4)}>
                  {(article) => (
                    <ArticleCard article={article} settings={{ isFeedMode: true }} desktopCoverSize="M" />
                  )}
                </For>
              </Show>

              <Show when={isLoadMoreButtonVisible()}>
                <p class="load-more-container">
                  <button class="button" onClick={loadMore}>
                    {t('Load more')}
                  </button>
                </p>
              </Show>
            </Show>
          </Show>
        </div>

        <aside class={clsx('col-md-7 col-xl-6 offset-xl-1', styles.feedAside)}>
          <Show when={isRightColumnLoaded()}>
            <Show when={topComments().length > 0}>
              <section class={styles.asideSection}>
                <h4>{t('Comments')}</h4>
                <For each={topComments()}>
                  {(comment) => {
                    return (
                      <div class={styles.comment}>
                        <div class={clsx('text-truncate', styles.commentBody)}>
                          <A
                            href={`article/${comment.shout.slug}?commentId=${comment.id}`}
                            innerHTML={comment.body || ''}
                          />
                        </div>
                        <div class={styles.commentDetails}>
                          <AuthorLink author={comment.created_by as Author} size={'XS'} />
                          <CommentDate comment={comment} isShort={true} isLastInRow={true} />
                        </div>
                        <div class={clsx('text-truncate', styles.commentArticleTitle)}>
                          <a href={`/${comment.shout.slug}`}>{comment.shout.title}</a>
                        </div>
                      </div>
                    )
                  }}
                </For>
              </section>
            </Show>

            <Show when={topTopics().length > 0}>
              <section class={styles.asideSection}>
                <h4>{t('Hot topics')}</h4>
                <For each={topTopics().slice(0, 7)}>
                  {(topic) => (
                    <span class={clsx(stylesTopic.shoutTopic, styles.topic)}>
                      <a href={`/topic/${topic.slug}`}>{topic.title}</a>{' '}
                    </span>
                  )}
                </For>
              </section>
            </Show>

            <section class={clsx(styles.asideSection, styles.pinnedLinks)}>
              <h4>{t('Knowledge base')}</h4>
              <ul class="nodash">
                <li>
                  <A href={'/guide'}>Как устроен Дискурс</A>
                </li>
                <li>
                  <A href="/how-to-write-a-good-article">Как создать хороший текст</A>
                </li>
                <li>
                  <A href="#">Правила конструктивных дискуссий</A>
                </li>
                <li>
                  <A href={'/principles'}>Принципы сообщества</A>
                </li>
              </ul>
            </section>
            <Show when={unratedArticles()}>
              <section class={clsx(styles.asideSection)}>
                <h4>{t('Be the first to rate')}</h4>
                <For each={unratedArticles()}>
                  {(article) => (
                    <ArticleCard article={article} settings={{ noimage: true, nodate: true }} />
                  )}
                </For>
              </section>
            </Show>
          </Show>
        </aside>
      </div>
      <Show when={shareData()}>
        <ShareModal
          title={shareData()?.title || ''}
          description={shareData()?.description || ''}
          imageUrl={shareData()?.cover || ''}
          shareUrl={getShareUrl({ pathname: `/${shareData()?.slug || ''}` })}
        />
      </Show>

      <Modal variant="medium" name="inviteCoauthors">
        <InviteMembers variant={'coauthors'} title={t('Invite experts')} />
      </Modal>
    </div>
  )
}