bsky-social-app/src/state/queries/trending/useTrendingTopics.ts

import React from 'react'
import {type AppBskyUnspeccedDefs, hasMutedWord} from '@atproto/api'
import {useQuery} from '@tanstack/react-query'

import {STALE} from '#/state/queries'
import {usePreferencesQuery} from '#/state/queries/preferences'
import {useAgent} from '#/state/session'

export type TrendingTopic = AppBskyUnspeccedDefs.TrendingTopic

type Response = {
  topics: TrendingTopic[]
  suggested: TrendingTopic[]
}

export const DEFAULT_LIMIT = 14

export const trendingTopicsQueryKey = ['trending-topics']

export function useTrendingTopics() {
  const agent = useAgent()
  const {data: preferences} = usePreferencesQuery()
  const mutedWords = React.useMemo(() => {
    return preferences?.moderationPrefs?.mutedWords || []
  }, [preferences?.moderationPrefs])

  return useQuery<Response>({
    refetchOnWindowFocus: true,
    staleTime: STALE.MINUTES.THREE,
    queryKey: trendingTopicsQueryKey,
    async queryFn() {
      const {data} = await agent.api.app.bsky.unspecced.getTrendingTopics({
        limit: DEFAULT_LIMIT,
      })
      return {
        topics: data.topics ?? [],
        suggested: data.suggested ?? [],
      }
    },
    select: React.useCallback(
      (data: Response) => {
        return {
          topics: data.topics.filter(t => {
            return !hasMutedWord({
              mutedWords,
              text: t.topic + ' ' + t.displayName + ' ' + t.description,
            })
          }),
          suggested: data.suggested.filter(t => {
            return !hasMutedWord({
              mutedWords,
              text: t.topic + ' ' + t.displayName + ' ' + t.description,
            })
          }),
        }
      },
      [mutedWords],
    ),
  })
}