import type { Author, Reaction, Shout, Topic } from '../../../graphql/schema/core.gen'

import { getPagePath } from '@nanostores/router'
import { clsx } from 'clsx'
import { For, Match, Show, Switch, createEffect, createMemo, createSignal, on, onMount } from 'solid-js'

import { useFollowing } from '../../../context/following'
import { useLocalize } from '../../../context/localize'
import { Meta, Title } from '../../../context/meta'
import { useSession } from '../../../context/session'
import { apiClient } from '../../../graphql/client/core'
import { router, useRouter } from '../../../stores/router'
import { loadShouts, useArticlesStore } from '../../../stores/zine/articles'
import { loadAuthor } from '../../../stores/zine/authors'
import { getImageUrl } from '../../../utils/getImageUrl'
import { getDescription } from '../../../utils/meta'
import { restoreScrollPosition, saveScrollPosition } from '../../../utils/scroll'
import { splitToPages } from '../../../utils/splitToPages'
import { Comment } from '../../Article/Comment'
import { AuthorCard } from '../../Author/AuthorCard'
import { AuthorShoutsRating } from '../../Author/AuthorShoutsRating'
import { Row1 } from '../../Feed/Row1'
import { Row2 } from '../../Feed/Row2'
import { Row3 } from '../../Feed/Row3'
import { Loading } from '../../_shared/Loading'

import { MODALS, hideModal } from '../../../stores/ui'
import { byCreated } from '../../../utils/sortby'
import stylesArticle from '../../Article/Article.module.scss'
import { Placeholder } from '../../Feed/Placeholder'
import styles from './Author.module.scss'

type Props = {
  authorSlug: string
  shouts?: Shout[]
  author?: Author
}
export const PRERENDERED_ARTICLES_COUNT = 12
const LOAD_MORE_PAGE_SIZE = 9

export const AuthorView = (props: Props) => {
  const { t } = useLocalize()
  const { followers: myFollowers, follows: myFollows } = useFollowing()
  const { author: me } = useSession()
  const { sortedArticles } = useArticlesStore({ shouts: props.shouts })
  const { page: getPage, searchParams } = useRouter()
  const [isLoadMoreButtonVisible, setIsLoadMoreButtonVisible] = createSignal(false)
  const [isBioExpanded, setIsBioExpanded] = createSignal(false)
  const [author, setAuthor] = createSignal<Author>(props.author)
  const [followers, setFollowers] = createSignal([])
  const [following, changeFollowing] = createSignal<Array<Author | Topic>>([]) // flat AuthorFollowsResult
  const [showExpandBioControl, setShowExpandBioControl] = createSignal(false)
  const [commented, setCommented] = createSignal<Reaction[]>()
  const modal = MODALS[searchParams().m]

  // пагинация загрузки ленты постов
  const loadMore = async () => {
    saveScrollPosition()
    const { hasMore } = await loadShouts({
      filters: { author: props.authorSlug },
      limit: LOAD_MORE_PAGE_SIZE,
      offset: sortedArticles().length,
    })
    setIsLoadMoreButtonVisible(hasMore)
    restoreScrollPosition()
  }

  // загружает профиль и подписки
  const [isFetching, setIsFetching] = createSignal(false)
  const fetchData = async (slug) => {
    setIsFetching(true)
    const authorResult = await loadAuthor({ slug })
    setAuthor(authorResult)
    console.info(`[Author] profile for @${slug} fetched`)

    const followsResult = await apiClient.getAuthorFollows({ slug })
    const { authors, topics } = followsResult
    changeFollowing([...(authors || []), ...(topics || [])])
    console.info(`[Author] follows for @${slug} fetched`)

    const followersResult = await apiClient.getAuthorFollowers({ slug })
    setFollowers(followersResult || [])
    console.info(`[Author] followers for @${slug} fetched`)
    setIsFetching(false)
  }

  // проверяет не собственный ли это профиль, иначе - загружает
  createEffect(
    on([() => me(), () => props.authorSlug], ([myProfile, slug]) => {
      const my = slug && myProfile?.slug === slug
      if (my) {
        console.debug('[Author] my profile precached')
        myProfile && setAuthor(myProfile)
        setFollowers(myFollowers() || [])
        changeFollowing([...(myFollows?.authors || []), ...(myFollows?.topics || [])])
      } else if (slug && !isFetching()) {
        fetchData(slug)
      }
    }),
    { defer: true },
  )

  // догружает ленту и комментарии
  createEffect(
    on(author, async (profile) => {
      if (!commented() && profile) {
        await loadMore()

        const ccc = await apiClient.getReactionsBy({
          by: { comment: true, created_by: profile.id },
        })
        setCommented(ccc)
      }
    }),
  )

  const bioContainerRef: { current: HTMLDivElement } = { current: null }
  const bioWrapperRef: { current: HTMLDivElement } = { current: null }
  const checkBioHeight = () => {
    if (bioContainerRef.current) {
      setShowExpandBioControl(bioContainerRef.current.offsetHeight > bioWrapperRef.current.offsetHeight)
    }
  }

  onMount(() => {
    if (!modal) hideModal()
    checkBioHeight()
  })

  const pages = createMemo<Shout[][]>(() =>
    splitToPages(sortedArticles(), PRERENDERED_ARTICLES_COUNT, LOAD_MORE_PAGE_SIZE),
  )

  const ogImage = createMemo(() =>
    author()?.pic
      ? getImageUrl(author()?.pic, { width: 1200 })
      : getImageUrl('production/image/logo_image.png'),
  )
  const description = createMemo(() => getDescription(author()?.bio))
  const handleDeleteComment = (id: number) => {
    setCommented((prev) => prev.filter((comment) => comment.id !== id))
  }

  return (
    <div class={styles.authorPage}>
      <Show when={author()}>
        <Title>{author().name}</Title>
        <Meta name="descprition" content={description()} />
        <Meta name="og:type" content="profile" />
        <Meta name="og:title" content={author().name} />
        <Meta name="og:image" content={ogImage()} />
        <Meta name="og:description" content={description()} />
        <Meta name="twitter:card" content="summary_large_image" />
        <Meta name="twitter:title" content={author().name} />
        <Meta name="twitter:description" content={description()} />
        <Meta name="twitter:image" content={ogImage()} />
      </Show>
      <div class="wide-container">
        <Show when={author()} fallback={<Loading />}>
          <>
            <div class={styles.authorHeader}>
              <AuthorCard author={author()} followers={followers() || []} flatFollows={following() || []} />
            </div>
            <div class={clsx(styles.groupControls, 'row')}>
              <div class="col-md-16">
                <ul class="view-switcher">
                  <li
                    classList={{
                      'view-switcher__item--selected': getPage().route === 'author',
                    }}
                  >
                    <a
                      href={getPagePath(router, 'author', {
                        slug: props.authorSlug,
                      })}
                    >
                      {t('Publications')}
                    </a>
                    <Show when={author().stat}>
                      <span class="view-switcher__counter">{author().stat.shouts}</span>
                    </Show>
                  </li>
                  <li
                    classList={{
                      'view-switcher__item--selected': getPage().route === 'authorComments',
                    }}
                  >
                    <a
                      href={getPagePath(router, 'authorComments', {
                        slug: props.authorSlug,
                      })}
                    >
                      {t('Comments')}
                    </a>
                    <Show when={author().stat}>
                      <span class="view-switcher__counter">{author().stat.comments}</span>
                    </Show>
                  </li>
                  <li
                    classList={{
                      'view-switcher__item--selected': getPage().route === 'authorAbout',
                    }}
                  >
                    <a
                      onClick={() => checkBioHeight()}
                      href={getPagePath(router, 'authorAbout', {
                        slug: props.authorSlug,
                      })}
                    >
                      {t('About')}
                    </a>
                  </li>
                </ul>
              </div>
              <div class={clsx('col-md-8', styles.additionalControls)}>
                <Show when={author()?.stat?.rating || author()?.stat?.rating === 0}>
                  <div class={styles.ratingContainer}>
                    {t('All posts rating')}
                    <AuthorShoutsRating author={author()} class={styles.ratingControl} />
                  </div>
                </Show>
              </div>
            </div>
          </>
        </Show>
      </div>

      <Switch>
        <Match when={getPage().route === 'authorAbout'}>
          <div class="wide-container">
            <div class="row">
              <div class="col-md-20 col-lg-18">
                <div
                  ref={(el) => (bioWrapperRef.current = el)}
                  class={styles.longBio}
                  classList={{ [styles.longBioExpanded]: isBioExpanded() }}
                >
                  <div ref={(el) => (bioContainerRef.current = el)} innerHTML={author()?.about || ''} />
                </div>

                <Show when={showExpandBioControl()}>
                  <button
                    class={clsx('button button--subscribe-topic', styles.longBioExpandedControl)}
                    onClick={() => setIsBioExpanded(!isBioExpanded())}
                  >
                    {t('Show more')}
                  </button>
                </Show>
              </div>
            </div>
          </div>
        </Match>
        <Match when={getPage().route === 'authorComments'}>
          <Show when={me()?.slug === props.authorSlug && !me().stat?.comments}>
            <div class="wide-container">
              <Placeholder type={getPage().route} mode="profile" />
            </div>
          </Show>

          <div class="wide-container">
            <div class="row">
              <div class="col-md-20 col-lg-18">
                <ul class={stylesArticle.comments}>
                  <For each={commented()?.sort(byCreated).reverse()}>
                    {(comment) => (
                      <Comment
                        comment={comment}
                        class={styles.comment}
                        showArticleLink={true}
                        onDelete={(id) => handleDeleteComment(id)}
                      />
                    )}
                  </For>
                </ul>
              </div>
            </div>
          </div>
        </Match>
        <Match when={getPage().route === 'author'}>
          <Show when={me()?.slug === props.authorSlug && !me().stat?.shouts}>
            <div class="wide-container">
              <Placeholder type={getPage().route} mode="profile" />
            </div>
          </Show>

          <Show when={sortedArticles().length > 0}>
            <Show when={sortedArticles().length === 1}>
              <Row1 article={sortedArticles()[0]} noauthor={true} nodate={true} />
            </Show>

            <Show when={sortedArticles().length === 2}>
              <Row2 articles={sortedArticles()} isEqual={true} noauthor={true} nodate={true} />
            </Show>

            <Show when={sortedArticles().length === 3}>
              <Row3 articles={sortedArticles()} noauthor={true} nodate={true} />
            </Show>

            <Show when={sortedArticles().length > 3}>
              <Row1 article={sortedArticles()[0]} noauthor={true} nodate={true} />
              <Row2 articles={sortedArticles().slice(1, 3)} isEqual={true} noauthor={true} />
              <Row1 article={sortedArticles()[3]} noauthor={true} nodate={true} />
              <Row2 articles={sortedArticles().slice(4, 6)} isEqual={true} noauthor={true} />
              <Row1 article={sortedArticles()[6]} noauthor={true} nodate={true} />
              <Row2 articles={sortedArticles().slice(7, 9)} isEqual={true} noauthor={true} />

              <For each={pages()}>
                {(page) => (
                  <>
                    <Row1 article={page[0]} noauthor={true} nodate={true} />
                    <Row2 articles={page.slice(1, 3)} isEqual={true} noauthor={true} />
                    <Row1 article={page[3]} noauthor={true} nodate={true} />
                    <Row2 articles={page.slice(4, 6)} isEqual={true} noauthor={true} />
                    <Row1 article={page[6]} noauthor={true} nodate={true} />
                    <Row2 articles={page.slice(7, 9)} isEqual={true} noauthor={true} />
                  </>
                )}
              </For>
            </Show>

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