manifold/web/hooks/use-fold.ts

import { useEffect, useState } from 'react'
import { Fold } from '../../common/fold'
import { User } from '../../common/user'
import {
  listenForFold,
  listenForFolds,
  listenForFollow,
} from '../lib/firebase/folds'

export const useFold = (foldId: string | undefined) => {
  const [fold, setFold] = useState<Fold | null | undefined>()

  useEffect(() => {
    if (foldId) return listenForFold(foldId, setFold)
  }, [foldId])

  return fold
}

export const useFolds = () => {
  const [folds, setFolds] = useState<Fold[] | undefined>()

  useEffect(() => {
    return listenForFolds(setFolds)
  }, [])

  return folds
}

export const useFollowingFold = (fold: Fold, user: User | null | undefined) => {
  const [following, setFollowing] = useState<boolean | undefined>()

  useEffect(() => {
    if (user) return listenForFollow(fold, user, setFollowing)
  }, [fold, user])

  return following
}