From 4f287432520eac2cdae65c9b45078c48507d2c3c Mon Sep 17 00:00:00 2001
From: Sinclair Chen <abc.sinclair@gmail.com>
Date: Wed, 22 Jun 2022 11:30:10 -0500
Subject: [PATCH] Non-quad tip UI (WIP)

---
 web/components/tipper.tsx | 126 ++++++++++----------------------------
 1 file changed, 32 insertions(+), 94 deletions(-)

diff --git a/web/components/tipper.tsx b/web/components/tipper.tsx
index 3b4d3603..57c15e05 100644
--- a/web/components/tipper.tsx
+++ b/web/components/tipper.tsx
@@ -1,3 +1,4 @@
+import { XIcon } from '@heroicons/react/outline'
 import {
   ChevronDoubleRightIcon,
   ChevronLeftIcon,
@@ -7,7 +8,7 @@ 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 { debounce, sum, 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'
@@ -16,33 +17,24 @@ import { track } from 'web/lib/service/analytics'
 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
+  const savedTip = tips[myId] ?? 0
 
-  // optimistically increase the tip count, but debounce the update
-  const [localTip, setLocalTip] = useState(savedTip ?? 0)
+  const [localTip, setLocalTip] = useState(savedTip)
+  // listen for user being set
   const initialized = useRef(false)
   useEffect(() => {
-    if (savedTip && !initialized.current) {
-      setLocalTip(savedTip)
+    if (tips[myId] && !initialized.current) {
+      setLocalTip(tips[myId])
       initialized.current = true
     }
-  }, [savedTip])
+  }, [tips, myId])
 
-  const score = useMemo(() => {
-    const tipVals = Object.values({ ...tips, [myId]: localTip })
-    return sumBy(tipVals, invQuad)
-  }, [localTip, tips, myId])
+  const total = sum(Object.values(tips)) - savedTip + localTip
 
   // declare debounced function only on first render
   const [saveTip] = useState(() =>
@@ -80,87 +72,33 @@ export function Tipper(prop: { comment: Comment; tips: CommentTips }) {
 
   const changeTip = (tip: number) => {
     setLocalTip(tip)
-    me && saveTip(me, tip - (savedTip ?? 0))
+    me && saveTip(me, tip - savedTip)
   }
 
   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 className="items-center gap-2">
+      {total > 0 && <span className="font-normal">{total}</span>}
+
+      <button
+        className="font-bold disabled:text-gray-300"
+        disabled={
+          !me ||
+          me.id === comment.userId ||
+          me.balance < localTip - savedTip + 5
+        }
+        onClick={() => changeTip(localTip + 5)}
+      >
+        Tip
+      </button>
+      {localTip > 0 && (
+        <span className="text-primary font-semibold">(+{localTip})</span>
+      )}
+      {/* undo button */}
+      {localTip > 0 && (
+        <button className="text-red-500" onClick={() => changeTip(0)}>
+          <XIcon className="w-4" />
+        </button>
       )}
     </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>
-  )
-}