bsky-social-app/src/screens/PostThread/components/ThreadItemReadMore.tsx

import {memo} from 'react'
import {View} from 'react-native'
import {msg, Plural, Trans} from '@lingui/macro'
import {useLingui} from '@lingui/react'

import {
  type PostThreadParams,
  type ThreadItem,
} from '#/state/queries/usePostThread'
import {
  LINEAR_AVI_WIDTH,
  REPLY_LINE_WIDTH,
  TREE_AVI_WIDTH,
  TREE_INDENT,
} from '#/screens/PostThread/const'
import {atoms as a, useTheme} from '#/alf'
import {CirclePlus_Stroke2_Corner0_Rounded as CirclePlus} from '#/components/icons/CirclePlus'
import {Link} from '#/components/Link'
import {Text} from '#/components/Typography'

export const ThreadItemReadMore = memo(function ThreadItemReadMore({
  item,
  view,
}: {
  item: Extract<ThreadItem, {type: 'readMore'}>
  view: PostThreadParams['view']
}) {
  const t = useTheme()
  const {_} = useLingui()
  const isTreeView = view === 'tree'
  const indent = Math.max(0, item.depth - 1)

  const spacers = isTreeView
    ? Array.from(Array(indent)).map((_, n: number) => {
        const isSkipped = item.skippedIndentIndices.has(n)
        return (
          <View
            key={`${item.key}-padding-${n}`}
            style={[
              t.atoms.border_contrast_low,
              {
                borderRightWidth: isSkipped ? 0 : REPLY_LINE_WIDTH,
                width: TREE_INDENT + TREE_AVI_WIDTH / 2,
                left: 1,
              },
            ]}
          />
        )
      })
    : null

  return (
    <View style={[a.flex_row]}>
      {spacers}
      <View
        style={[
          t.atoms.border_contrast_low,
          {
            marginLeft: isTreeView
              ? TREE_INDENT + TREE_AVI_WIDTH / 2 - 1
              : (LINEAR_AVI_WIDTH - REPLY_LINE_WIDTH) / 2 + 16,
            borderLeftWidth: 2,
            borderBottomWidth: 2,
            borderBottomLeftRadius: a.rounded_sm.borderRadius,
            height: 18, // magic, Link below is 38px tall
            width: isTreeView ? TREE_INDENT : LINEAR_AVI_WIDTH / 2 + 10,
          },
        ]}
      />
      <Link
        label={_(msg`Read more replies`)}
        to={item.href}
        style={[a.pt_sm, a.pb_md, a.gap_xs]}>
        {({hovered, pressed}) => {
          const interacted = hovered || pressed
          return (
            <>
              <CirclePlus
                fill={
                  interacted
                    ? t.atoms.text_contrast_high.color
                    : t.atoms.text_contrast_low.color
                }
                width={18}
              />
              <Text
                style={[
                  a.text_sm,
                  t.atoms.text_contrast_medium,
                  interacted && a.underline,
                ]}>
                <Trans>
                  Read {item.moreReplies} more{' '}
                  <Plural
                    one="reply"
                    other="replies"
                    value={item.moreReplies}
                  />
                </Trans>
              </Text>
            </>
          )
        }}
      </Link>
    </View>
  )
})