manifold/web/hooks/use-contract.ts

import { useEffect } from 'react'
import { useFirestoreDocumentData } from '@react-query-firebase/firestore'
import {
  Contract,
  contractDocRef,
  listenForContract,
} from 'web/lib/firebase/contracts'
import { useStateCheckEquality } from './use-state-check-equality'
import { DocumentData } from 'firebase/firestore'

export const useContract = (contractId: string) => {
  const result = useFirestoreDocumentData<DocumentData, Contract>(
    ['contracts', contractId],
    contractDocRef(contractId),
    { subscribe: true, includeMetadataChanges: true }
  )

  return result.isLoading ? undefined : result.data
}

export const useContractWithPreload = (initial: Contract | null) => {
  const [contract, setContract] = useStateCheckEquality<Contract | null>(
    initial
  )
  const contractId = initial?.id

  useEffect(() => {
    if (contractId) return listenForContract(contractId, setContract)
  }, [contractId, setContract])

  return contract
}