Comment tips (#469)

* Add tip arrows UI (visual)

* move tipper into its own component

* simplify score calculation

* Add tip txns

- more specific txn types
- fix transact cloud function to be able to create tip txns
- insert tips into comments via a context

* Refactor tipper to send tip txns

* Stop tipping yourself. Disable anons.

* Style tipper (smaller)

* remove default exports

* capitalize tooltips

* rename stuff

* add exhausting hook dependencies

* replace context with prop threading

* fix eslint unused vars

common/txn.ts

@@ -13,9 +13,27 @@ export type Txn = {
   amount: number
   token: 'M$' // | 'USD' | MarketOutcome
 
-  category: 'CHARITY' // | 'BET' | 'TIP'
+  category: 'CHARITY' | 'TIP' // | 'BET'
+  // Any extra data
+  data?: { [key: string]: any }
   // Human-readable description
   description?: string
 }
 
 export type SourceType = 'USER' | 'CONTRACT' | 'CHARITY' | 'BANK'
+
+export type DonationTxn = Omit<Txn, 'data'> & {
+  fromType: 'USER'
+  toType: 'CHARITY'
+  category: 'CHARITY'
+}
+
+export type TipTxn = Txn & {
+  fromType: 'USER'
+  toType: 'USER'
+  category: 'TIP'
+  data: {
+    contractId: string
+    commentId: string
+  }
+}

functions/src/transact.ts

@@ -11,7 +11,17 @@ export const transact = functions
     const userId = context?.auth?.uid
     if (!userId) return { status: 'error', message: 'Not authorized' }
 
-    const { amount, fromType, fromId, toId, toType, description } = data
+    const {
+      amount,
+      fromType,
+      fromId,
+      toId,
+      toType,
+      category,
+      token,
+      data: innerData,
+      description,
+    } = data
 
     if (fromType !== 'USER')
       return {
@@ -25,7 +35,7 @@ export const transact = functions
         message: 'Must be authenticated with userId equal to specified fromId.',
       }
 
-    if (amount <= 0 || isNaN(amount) || !isFinite(amount))
+    if (isNaN(amount) || !isFinite(amount))
       return { status: 'error', message: 'Invalid amount' }
 
     // Run as transaction to prevent race conditions.
@@ -69,9 +79,10 @@ export const transact = functions
         toType,
 
         amount,
-        // TODO: Unhardcode once we have non-donation txns
+        category,
-        token: 'M$',
+        data: innerData,
-        category: 'CHARITY',
+        token,
+
         description,
       })
 

web/components/charity/feed-items.tsx

@@ -1,11 +1,11 @@
-import { Txn } from 'common/txn'
+import { DonationTxn } from 'common/txn'
 import { Avatar } from '../avatar'
 import { useUserById } from 'web/hooks/use-users'
 import { UserLink } from '../user-page'
 import { manaToUSD } from '../../../common/util/format'
 import { RelativeTimestamp } from '../relative-timestamp'
 
-export function Donation(props: { txn: Txn }) {
+export function Donation(props: { txn: DonationTxn }) {
   const { txn } = props
   const user = useUserById(txn.fromId)
 

web/components/contract/contract-overview.tsx

@@ -13,7 +13,6 @@ import {
   NumericResolutionOrExpectation,
 } from './contract-card'
 import { Bet } from 'common/bet'
-import { Comment } from 'common/comment'
 import BetRow from '../bet-row'
 import { AnswersGraph } from '../answers/answers-graph'
 import { Contract } from 'common/contract'
@@ -25,7 +24,6 @@ import { NumericGraph } from './numeric-graph'
 export const ContractOverview = (props: {
   contract: Contract
   bets: Bet[]
-  comments: Comment[]
   className?: string
 }) => {
   const { contract, bets, className } = props

web/components/contract/contract-tabs.tsx

@@ -7,14 +7,16 @@ import { ContractBetsTable, BetsSummary } from '../bets-list'
 import { Spacer } from '../layout/spacer'
 import { Tabs } from '../layout/tabs'
 import { Col } from '../layout/col'
+import { CommentTipMap } from 'web/hooks/use-tip-txns'
 
 export function ContractTabs(props: {
   contract: Contract
   user: User | null | undefined
   bets: Bet[]
   comments: Comment[]
+  tips: CommentTipMap
 }) {
-  const { contract, user, bets, comments } = props
+  const { contract, user, bets, comments, tips } = props
   const { outcomeType } = contract
 
   const userBets = user && bets.filter((bet) => bet.userId === user.id)
@@ -24,6 +26,7 @@ export function ContractTabs(props: {
       contract={contract}
       bets={bets}
       comments={comments}
+      tips={tips}
       user={user}
       mode="bets"
       betRowClassName="!mt-0 xl:hidden"
@@ -36,6 +39,7 @@ export function ContractTabs(props: {
         contract={contract}
         bets={bets}
         comments={comments}
+        tips={tips}
         user={user}
         mode={
           contract.outcomeType === 'FREE_RESPONSE'
@@ -52,6 +56,7 @@ export function ContractTabs(props: {
             contract={contract}
             bets={bets}
             comments={comments}
+            tips={tips}
             user={user}
             mode={'comments'}
             betRowClassName="!mt-0 xl:hidden"

web/components/feed/activity-items.ts

@@ -6,6 +6,7 @@ import { getOutcomeProbability } from 'common/calculate'
 import { Comment } from 'common/comment'
 import { Contract, FreeResponseContract } from 'common/contract'
 import { User } from 'common/user'
+import { CommentTipMap } from 'web/hooks/use-tip-txns'
 
 export type ActivityItem =
   | DescriptionItem
@@ -50,6 +51,7 @@ export type CommentThreadItem = BaseActivityItem & {
   type: 'commentThread'
   parentComment: Comment
   comments: Comment[]
+  tips: CommentTipMap
   bets: Bet[]
 }
 
@@ -58,6 +60,7 @@ export type AnswerGroupItem = BaseActivityItem & {
   user: User | undefined | null
   answer: Answer
   comments: Comment[]
+  tips: CommentTipMap
   bets: Bet[]
 }
 
@@ -103,6 +106,7 @@ function getAnswerAndCommentInputGroups(
 function getCommentThreads(
   bets: Bet[],
   comments: Comment[],
+  tips: CommentTipMap,
   contract: Contract
 ) {
   const parentComments = comments.filter((comment) => !comment.replyToCommentId)
@@ -114,6 +118,7 @@ function getCommentThreads(
     comments: comments,
     parentComment: comment,
     bets: bets,
+    tips,
   }))
 
   return items
@@ -132,6 +137,7 @@ export function getSpecificContractActivityItems(
   contract: Contract,
   bets: Bet[],
   comments: Comment[],
+  tips: CommentTipMap,
   user: User | null | undefined,
   options: {
     mode: 'comments' | 'bets' | 'free-response-comment-answer-groups'
@@ -167,6 +173,7 @@ export function getSpecificContractActivityItems(
         ...getCommentThreads(
           nonFreeResponseBets,
           nonFreeResponseComments,
+          tips,
           contract
         )
       )

web/components/feed/contract-activity.tsx

@@ -7,18 +7,20 @@ import { getSpecificContractActivityItems } from './activity-items'
 import { FeedItems } from './feed-items'
 import { User } from 'common/user'
 import { useContractWithPreload } from 'web/hooks/use-contract'
+import { CommentTipMap } from 'web/hooks/use-tip-txns'
 
 export function ContractActivity(props: {
   contract: Contract
   bets: Bet[]
   comments: Comment[]
+  tips: CommentTipMap
   user: User | null | undefined
   mode: 'comments' | 'bets' | 'free-response-comment-answer-groups'
   contractPath?: string
   className?: string
   betRowClassName?: string
 }) {
-  const { user, mode, className, betRowClassName } = props
+  const { user, mode, tips, className, betRowClassName } = props
 
   const contract = useContractWithPreload(props.contract) ?? props.contract
 
@@ -31,6 +33,7 @@ export function ContractActivity(props: {
     contract,
     bets,
     comments,
+    tips,
     user,
     { mode }
   )

web/components/feed/feed-answer-comment-group.tsx

@@ -24,15 +24,17 @@ import { groupBy } from 'lodash'
 import { User } from 'common/user'
 import { useEvent } from 'web/hooks/use-event'
 import { getDpmOutcomeProbability } from 'common/calculate-dpm'
+import { CommentTipMap } from 'web/hooks/use-tip-txns'
 
 export function FeedAnswerCommentGroup(props: {
   contract: any
   user: User | undefined | null
   answer: Answer
   comments: Comment[]
+  tips: CommentTipMap
   bets: Bet[]
 }) {
-  const { answer, contract, comments, bets, user } = props
+  const { answer, contract, comments, tips, bets, user } = props
   const { username, avatarUrl, name, text } = answer
 
   const [replyToUsername, setReplyToUsername] = useState('')
@@ -214,6 +216,7 @@ export function FeedAnswerCommentGroup(props: {
         smallAvatar={true}
         truncate={false}
         bets={bets}
+        tips={tips}
         scrollAndOpenReplyInput={scrollAndOpenReplyInput}
         treatFirstIndexEqually={true}
       />

web/components/feed/feed-comments.tsx

@@ -25,17 +25,27 @@ import { getProbability } from 'common/calculate'
 import { LoadingIndicator } from 'web/components/loading-indicator'
 import { PaperAirplaneIcon } from '@heroicons/react/outline'
 import { track } from 'web/lib/service/analytics'
+import { Tipper } from '../tipper'
+import { CommentTipMap, CommentTips } from 'web/hooks/use-tip-txns'
 
 export function FeedCommentThread(props: {
   contract: Contract
   comments: Comment[]
+  tips: CommentTipMap
   parentComment: Comment
   bets: Bet[]
   truncate?: boolean
   smallAvatar?: boolean
 }) {
-  const { contract, comments, bets, truncate, smallAvatar, parentComment } =
+  const {
-    props
+    contract,
+    comments,
+    bets,
+    tips,
+    truncate,
+    smallAvatar,
+    parentComment,
+  } = props
   const [showReply, setShowReply] = useState(false)
   const [replyToUsername, setReplyToUsername] = useState('')
   const betsByUserId = groupBy(bets, (bet) => bet.userId)
@@ -64,6 +74,7 @@ export function FeedCommentThread(props: {
         contract={contract}
         commentsList={commentsList}
         betsByUserId={betsByUserId}
+        tips={tips}
         smallAvatar={smallAvatar}
         truncate={truncate}
         bets={bets}
@@ -97,6 +108,7 @@ export function CommentRepliesList(props: {
   contract: Contract
   commentsList: Comment[]
   betsByUserId: Dictionary<Bet[]>
+  tips: CommentTipMap
   scrollAndOpenReplyInput: (comment: Comment) => void
   bets: Bet[]
   treatFirstIndexEqually?: boolean
@@ -107,6 +119,7 @@ export function CommentRepliesList(props: {
     contract,
     commentsList,
     betsByUserId,
+    tips,
     truncate,
     smallAvatar,
     bets,
@@ -134,6 +147,7 @@ export function CommentRepliesList(props: {
           <FeedComment
             contract={contract}
             comment={comment}
+            tips={tips[comment.id]}
             betsBySameUser={betsByUserId[comment.userId] ?? []}
             onReplyClick={scrollAndOpenReplyInput}
             probAtCreatedTime={
@@ -157,6 +171,7 @@ export function CommentRepliesList(props: {
 export function FeedComment(props: {
   contract: Contract
   comment: Comment
+  tips: CommentTips
   betsBySameUser: Bet[]
   probAtCreatedTime?: number
   truncate?: boolean
@@ -166,6 +181,7 @@ export function FeedComment(props: {
   const {
     contract,
     comment,
+    tips,
     betsBySameUser,
     probAtCreatedTime,
     truncate,
@@ -257,14 +273,17 @@ export function FeedComment(props: {
           moreHref={contractPath(contract)}
           shouldTruncate={truncate}
         />
-        {onReplyClick && (
+        <Row className="mt-2 items-center gap-6 text-xs text-gray-500">
-          <button
+          <Tipper comment={comment} tips={tips ?? {}} />
-            className={'text-xs font-bold text-gray-500 hover:underline'}
+          {onReplyClick && (
-            onClick={() => onReplyClick(comment)}
+            <button
-          >
+              className="font-bold hover:underline"
-            Reply
+              onClick={() => onReplyClick(comment)}
-          </button>
+            >
-        )}
+              Reply
+            </button>
+          )}
+        </Row>
       </div>
     </Row>
   )

web/components/tipper.tsx

@@ -0,0 +1,157 @@
+import {
+  ChevronDoubleRightIcon,
+  ChevronLeftIcon,
+  ChevronRightIcon,
+} from '@heroicons/react/solid'
+import clsx from 'clsx'
+import { Comment } from 'common/comment'
+import { User } from 'common/user'
+import { formatMoney } from 'common/util/format'
+import { debounce, sumBy } from 'lodash'
+import { useEffect, useMemo, useRef, useState } from 'react'
+import { CommentTips } from 'web/hooks/use-tip-txns'
+import { useUser } from 'web/hooks/use-user'
+import { transact } from 'web/lib/firebase/fn-call'
+import { Row } from './layout/row'
+import { Tooltip } from './tooltip'
+
+// xth triangle number * 5  =  5 + 10 + 15 + ... + (x * 5)
+const quad = (x: number) => (5 / 2) * x * (x + 1)
+
+// inverse (see https://math.stackexchange.com/questions/2041988/how-to-get-inverse-of-formula-for-sum-of-integers-from-1-to-nsee )
+const invQuad = (y: number) => Math.sqrt((2 / 5) * y + 1 / 4) - 1 / 2
+
+export function Tipper(prop: { comment: Comment; tips: CommentTips }) {
+  const { comment, tips } = prop
+
+  const me = useUser()
+  const myId = me?.id ?? ''
+  const savedTip = tips[myId] as number | undefined
+
+  // optimistically increase the tip count, but debounce the update
+  const [localTip, setLocalTip] = useState(savedTip ?? 0)
+  const initialized = useRef(false)
+  useEffect(() => {
+    if (savedTip && !initialized.current) {
+      setLocalTip(savedTip)
+      initialized.current = true
+    }
+  }, [savedTip])
+
+  const score = useMemo(() => {
+    const tipVals = Object.values({ ...tips, [myId]: localTip })
+    return sumBy(tipVals, invQuad)
+  }, [localTip, tips, myId])
+
+  // declare debounced function only on first render
+  const [saveTip] = useState(() =>
+    debounce(async (user: User, change: number) => {
+      if (change === 0) {
+        return
+      }
+
+      await transact({
+        amount: change,
+        fromId: user.id,
+        fromType: 'USER',
+        toId: comment.userId,
+        toType: 'USER',
+        token: 'M$',
+        category: 'TIP',
+        data: {
+          contractId: comment.contractId,
+          commentId: comment.id,
+        },
+        description: `${user.name} tipped M$ ${change} to ${comment.userName} for a comment`,
+      })
+    }, 1500)
+  )
+  // instant save on unrender
+  useEffect(() => () => void saveTip.flush(), [saveTip])
+
+  const changeTip = (tip: number) => {
+    setLocalTip(tip)
+    me && saveTip(me, tip - (savedTip ?? 0))
+  }
+
+  return (
+    <Row className="items-center gap-0.5">
+      <DownTip
+        value={localTip}
+        onChange={changeTip}
+        disabled={!me || localTip <= 0}
+      />
+      <span className="font-bold">{Math.floor(score)} </span>
+      <UpTip
+        value={localTip}
+        onChange={changeTip}
+        disabled={!me || me.id === comment.userId}
+      />
+      {localTip === 0 ? (
+        ''
+      ) : (
+        <span
+          className={clsx(
+            'font-semibold',
+            localTip > 0 ? 'text-primary' : 'text-red-400'
+          )}
+        >
+          ({formatMoney(localTip)} tip)
+        </span>
+      )}
+    </Row>
+  )
+}
+
+function DownTip(prop: {
+  value: number
+  onChange: (tip: number) => void
+  disabled?: boolean
+}) {
+  const { onChange, value, disabled } = prop
+  const marginal = 5 * invQuad(value)
+  return (
+    <Tooltip
+      className="tooltip-bottom"
+      text={!disabled && `Refund ${formatMoney(marginal)}`}
+    >
+      <button
+        className="flex h-max items-center hover:text-red-600 disabled:text-gray-300"
+        disabled={disabled}
+        onClick={() => onChange(value - marginal)}
+      >
+        <ChevronLeftIcon className="h-6 w-6" />
+      </button>
+    </Tooltip>
+  )
+}
+
+function UpTip(prop: {
+  value: number
+  onChange: (tip: number) => void
+  disabled?: boolean
+}) {
+  const { onChange, value, disabled } = prop
+  const marginal = 5 * invQuad(value) + 5
+
+  return (
+    <Tooltip
+      className="tooltip-bottom"
+      text={!disabled && `Tip ${formatMoney(marginal)}`}
+    >
+      <button
+        className="hover:text-primary flex h-max items-center disabled:text-gray-300"
+        disabled={disabled}
+        onClick={() => onChange(value + marginal)}
+      >
+        {value >= quad(2) ? (
+          <ChevronDoubleRightIcon className="text-primary mx-1 h-6 w-6" />
+        ) : value > 0 ? (
+          <ChevronRightIcon className="text-primary h-6 w-6" />
+        ) : (
+          <ChevronRightIcon className="h-6 w-6" />
+        )}
+      </button>
+    </Tooltip>
+  )
+}

web/components/tooltip.tsx

@@ -0,0 +1,16 @@
+import clsx from 'clsx'
+
+export function Tooltip(
+  props: {
+    text: string | false | undefined | null
+  } & JSX.IntrinsicElements['div']
+) {
+  const { text, children, className } = props
+  return text ? (
+    <div className={clsx(className, 'tooltip z-10')} data-tip={text}>
+      {children}
+    </div>
+  ) : (
+    <>{children}</>
+  )
+}

web/hooks/use-charity-txns.ts

@@ -1,9 +1,9 @@
 import { useEffect, useState } from 'react'
-import { Txn } from 'common/txn'
+import { DonationTxn } from 'common/txn'
 import { listenForCharityTxns } from 'web/lib/firebase/txns'
 
 export const useCharityTxns = (charityId: string) => {
-  const [txns, setTxns] = useState<Txn[]>([])
+  const [txns, setTxns] = useState<DonationTxn[]>([])
 
   useEffect(() => {
     return listenForCharityTxns(charityId, setTxns)

web/hooks/use-tip-txns.ts

@@ -0,0 +1,23 @@
+import { TipTxn } from 'common/txn'
+import { groupBy, mapValues, sumBy } from 'lodash'
+import { useEffect, useMemo, useState } from 'react'
+import { listenForTipTxns } from 'web/lib/firebase/txns'
+
+export type CommentTips = { [userId: string]: number }
+export type CommentTipMap = { [commentId: string]: CommentTips }
+
+export function useTipTxns(contractId: string): CommentTipMap {
+  const [txns, setTxns] = useState<TipTxn[]>([])
+
+  useEffect(() => {
+    return listenForTipTxns(contractId, setTxns)
+  }, [contractId, setTxns])
+
+  return useMemo(() => {
+    const byComment = groupBy(txns, 'data.commentId')
+    return mapValues(byComment, (txns) => {
+      const bySender = groupBy(txns, 'fromId')
+      return mapValues(bySender, (t) => sumBy(t, 'amount'))
+    })
+  }, [txns])
+}

web/lib/firebase/txns.ts

@@ -1,6 +1,5 @@
-import { collection, query, where, orderBy } from 'firebase/firestore'
+import { DonationTxn, TipTxn } from 'common/txn'
-import { Txn } from 'common/txn'
+import { collection, orderBy, query, where } from 'firebase/firestore'
-
 import { db } from './init'
 import { getValues, listenForValues } from './utils'
 
@@ -16,13 +15,27 @@ const getCharityQuery = (charityId: string) =>
 
 export function listenForCharityTxns(
   charityId: string,
-  setTxns: (txns: Txn[]) => void
+  setTxns: (txns: DonationTxn[]) => void
 ) {
-  return listenForValues<Txn>(getCharityQuery(charityId), setTxns)
+  return listenForValues<DonationTxn>(getCharityQuery(charityId), setTxns)
 }
 
 const charitiesQuery = query(txnCollection, where('toType', '==', 'CHARITY'))
 
 export function getAllCharityTxns() {
-  return getValues<Txn>(charitiesQuery)
+  return getValues<DonationTxn>(charitiesQuery)
+}
+
+const getTipsQuery = (contractId: string) =>
+  query(
+    txnCollection,
+    where('category', '==', 'TIP'),
+    where('data.contractId', '==', contractId)
+  )
+
+export function listenForTipTxns(
+  contractId: string,
+  setTxns: (txns: TipTxn[]) => void
+) {
+  return listenForValues<TipTxn>(getTipsQuery(contractId), setTxns)
 }

web/pages/[username]/[contractSlug].tsx

@@ -41,6 +41,7 @@ import ContractEmbedPage from '../embed/[username]/[contractSlug]'
 import { useBets } from 'web/hooks/use-bets'
 import { AlertBox } from 'web/components/alert-box'
 import { useTracking } from 'web/hooks/use-tracking'
+import { CommentTipMap, useTipTxns } from 'web/hooks/use-tip-txns'
 
 export const getStaticProps = fromPropz(getStaticPropz)
 export async function getStaticPropz(props: {
@@ -119,6 +120,8 @@ export function ContractPageContent(
   // Sort for now to see if bug is fixed.
   comments.sort((c1, c2) => c1.createdTime - c2.createdTime)
 
+  const tips = useTipTxns(contract.id)
+
   const user = useUser()
   const { width, height } = useWindowSize()
 
@@ -192,11 +195,7 @@ export function ContractPageContent(
           </button>
         )}
 
-        <ContractOverview
+        <ContractOverview contract={contract} bets={bets} />
-          contract={contract}
-          bets={bets}
-          comments={comments ?? []}
-        />
         {isNumeric && (
           <AlertBox
             title="Warning"
@@ -224,6 +223,7 @@ export function ContractPageContent(
                 contract={contract}
                 bets={bets}
                 comments={comments}
+                tips={tips}
               />
             </div>
             <Spacer h={12} />
@@ -234,6 +234,7 @@ export function ContractPageContent(
           contract={contract}
           user={user}
           bets={bets}
+          tips={tips}
           comments={comments}
         />
       </Col>
@@ -290,8 +291,9 @@ function ContractTopTrades(props: {
   contract: Contract
   bets: Bet[]
   comments: Comment[]
+  tips: CommentTipMap
 }) {
-  const { contract, bets, comments } = props
+  const { contract, bets, comments, tips } = props
   const commentsById = keyBy(comments, 'id')
   const betsById = keyBy(bets, 'id')
 
@@ -328,6 +330,7 @@ function ContractTopTrades(props: {
             <FeedComment
               contract={contract}
               comment={commentsById[topCommentId]}
+              tips={tips[topCommentId]}
               betsBySameUser={[betsById[topCommentId]]}
               truncate={false}
               smallAvatar={false}