supabase/apps/studio/components/interfaces/Storage/useBucketPolicyCount.ts

import { useCallback, useMemo } from 'react'

import { extractBucketNameFromDefinition } from 'components/interfaces/Storage/Storage.utils'
import { useDatabasePoliciesQuery } from 'data/database-policies/database-policies-query'
import { useSelectedProjectQuery } from 'hooks/misc/useSelectedProject'

export function useBucketPolicyCount() {
  const { data: project, isPending: isProjectPending } = useSelectedProjectQuery()
  const { data: policiesData = [], isPending: isPoliciesPending } = useDatabasePoliciesQuery({
    projectRef: project?.ref,
    connectionString: project?.connectionString,
    schema: 'storage',
  })

  const policyCountByBucket = useMemo(() => {
    const countMap = new Map<string, number>()
    for (const policy of policiesData) {
      if (policy.table !== 'objects') continue
      const bucketName =
        extractBucketNameFromDefinition(policy.definition) ??
        extractBucketNameFromDefinition(policy.check)
      if (bucketName) {
        countMap.set(bucketName, (countMap.get(bucketName) ?? 0) + 1)
      }
    }
    return countMap
  }, [policiesData])

  const getPolicyCount = useCallback(
    (bucketName: string) => policyCountByBucket.get(bucketName) ?? 0,
    [policyCountByBucket]
  )

  return { getPolicyCount, isLoading: isProjectPending || isPoliciesPending }
}