manifold/web/pages/link/[slug].tsx

import { useRouter } from 'next/router'
import { useEffect, useState } from 'react'
import { SEO } from 'web/components/SEO'
import { Title } from 'web/components/title'
import { claimManalink } from 'web/lib/firebase/api'
import { useManalink } from 'web/lib/firebase/manalinks'
import { ManalinkCard } from 'web/components/manalink-card'
import { useUser } from 'web/hooks/use-user'
import { firebaseLogin, getUser } from 'web/lib/firebase/users'
import { Row } from 'web/components/layout/row'
import { Button } from 'web/components/button'
import { useSaveReferral } from 'web/hooks/use-save-referral'
import { User } from 'common/user'
import { Manalink } from 'common/manalink'

export default function ClaimPage() {
  const user = useUser()
  const router = useRouter()
  const { slug } = router.query as { slug: string }
  const manalink = useManalink(slug)
  const [claiming, setClaiming] = useState(false)
  const [error, setError] = useState<string | undefined>(undefined)

  useReferral(user, manalink)

  if (!manalink) {
    return <></>
  }

  const info = { ...manalink, uses: manalink.claims.length }
  return (
    <>
      <SEO
        title="Send Mana"
        description="Send mana to anyone via link!"
        url="/send"
      />
      <div className="mx-auto max-w-xl px-2">
        <Row className="items-center justify-between">
          <Title text={`Claim M$${manalink.amount} mana`} />
          <div className="my-auto"></div>
        </Row>

        <ManalinkCard info={info} />

        {error && (
          <section className="my-5 text-red-500">
            <p>Failed to claim manalink.</p>
            <p>{error}</p>
          </section>
        )}

        <Row className="items-center">
          <Button
            onClick={async () => {
              setClaiming(true)
              try {
                if (user == null) {
                  await firebaseLogin()
                  setClaiming(false)
                  return
                }
                if (user?.id == manalink.fromId) {
                  throw new Error("You can't claim your own manalink.")
                }
                await claimManalink({ slug: manalink.slug })
                user && router.push(`/${user.username}?claimed-mana=yes`)
              } catch (e) {
                console.log(e)
                const message =
                  e && e instanceof Object ? e.toString() : 'An error occurred.'
                setError(message)
              }
              setClaiming(false)
            }}
            disabled={claiming}
            size="lg"
          >
            {user ? `Claim M$${manalink.amount}` : 'Login to claim'}
          </Button>
        </Row>
      </div>
    </>
  )
}

const useReferral = (user: User | undefined | null, manalink?: Manalink) => {
  const [creator, setCreator] = useState<User | undefined>(undefined)

  useEffect(() => {
    if (manalink?.fromId) getUser(manalink.fromId).then(setCreator)
  }, [manalink])

  useSaveReferral(user, { defaultReferrerUsername: creator?.username })
}