bsky-app/src/components/LikedByList.tsx

import React from 'react'
import {AppBskyFeedGetLikes as GetLikes} from '@atproto/api'
import {msg} from '@lingui/macro'
import {useLingui} from '@lingui/react'

import {logger} from '#/logger'
import {useLikedByQuery} from '#/state/queries/post-liked-by'
import {useResolveUriQuery} from '#/state/queries/resolve-uri'
import {useInitialNumToRender} from 'lib/hooks/useInitialNumToRender'
import {cleanError} from 'lib/strings/errors'
import {ProfileCardWithFollowBtn} from '#/view/com/profile/ProfileCard'
import {List} from '#/view/com/util/List'
import {ListFooter, ListMaybePlaceholder} from '#/components/Lists'

function renderItem({item}: {item: GetLikes.Like}) {
  return <ProfileCardWithFollowBtn key={item.actor.did} profile={item.actor} />
}

function keyExtractor(item: GetLikes.Like) {
  return item.actor.did
}

export function LikedByList({uri}: {uri: string}) {
  const {_} = useLingui()
  const initialNumToRender = useInitialNumToRender()
  const [isPTRing, setIsPTRing] = React.useState(false)

  const {
    data: resolvedUri,
    error: resolveError,
    isLoading: isUriLoading,
  } = useResolveUriQuery(uri)
  const {
    data,
    isLoading: isLikedByLoading,
    isFetchingNextPage,
    hasNextPage,
    fetchNextPage,
    error: likedByError,
    refetch,
  } = useLikedByQuery(resolvedUri?.uri)

  const error = resolveError || likedByError
  const isError = !!resolveError || !!likedByError

  const likes = React.useMemo(() => {
    if (data?.pages) {
      return data.pages.flatMap(page => page.likes)
    }
    return []
  }, [data])

  const onRefresh = React.useCallback(async () => {
    setIsPTRing(true)
    try {
      await refetch()
    } catch (err) {
      logger.error('Failed to refresh likes', {message: err})
    }
    setIsPTRing(false)
  }, [refetch, setIsPTRing])

  const onEndReached = React.useCallback(async () => {
    if (isFetchingNextPage || !hasNextPage || isError) return
    try {
      await fetchNextPage()
    } catch (err) {
      logger.error('Failed to load more likes', {message: err})
    }
  }, [isFetchingNextPage, hasNextPage, isError, fetchNextPage])

  if (likes.length < 1) {
    return (
      <ListMaybePlaceholder
        isLoading={isUriLoading || isLikedByLoading}
        isError={isError}
        emptyType="results"
        emptyMessage={_(
          msg`Nobody has liked this yet. Maybe you should be the first!`,
        )}
        errorMessage={cleanError(resolveError || error)}
        onRetry={isError ? refetch : undefined}
      />
    )
  }

  return (
    <List
      data={likes}
      renderItem={renderItem}
      keyExtractor={keyExtractor}
      refreshing={isPTRing}
      onRefresh={onRefresh}
      onEndReached={onEndReached}
      ListFooterComponent={
        <ListFooter
          isFetchingNextPage={isFetchingNextPage}
          error={cleanError(error)}
          onRetry={fetchNextPage}
        />
      }
      onEndReachedThreshold={3}
      initialNumToRender={initialNumToRender}
      windowSize={11}
    />
  )
}