Extract shared logic into ContractDetails

web/components/contract-overview.tsx

@@ -1,42 +1,26 @@
 import React from 'react'
-import dayjs from 'dayjs'
-import { Contract } from '../lib/firebase/contracts'
+import { compute, Contract } from '../lib/firebase/contracts'
 import { Col } from './layout/col'
-import { Row } from './layout/row'
 import { Spacer } from './layout/spacer'
-import { formatWithCommas } from '../lib/util/format'
 import { ContractProbGraph } from './contract-prob-graph'
+import { ContractDetails } from '../pages/markets'
 
 export const ContractOverview = (props: {
   contract: Contract
   className?: string
 }) => {
   const { contract, className } = props
-  const { pot, seedAmounts, createdTime } = contract
-
-  const volume = pot.YES + pot.NO - seedAmounts.YES - seedAmounts.NO
-  const prob = pot.YES ** 2 / (pot.YES ** 2 + pot.NO ** 2)
-  const probPercent = Math.round(prob * 100) + '%'
+  const { probPercent } = compute(contract)
 
   return (
     <Col className={className}>
       <Col className="justify-between md:flex-row">
         <Col>
-          <div className="text-3xl font-medium p-2">{contract.question}</div>
+          <div className="text-3xl text-indigo-700 mt-2 mb-4">
+            {contract.question}
+          </div>
 
-          <Row className="flex-wrap text-sm text-gray-600">
-            <div className="p-2 whitespace-nowrap">
-              By {contract.creatorName}
-            </div>
-            <div className="py-2">•</div>
-            <div className="p-2 whitespace-nowrap">
-              {dayjs(createdTime).format('MMM D')}
-            </div>
-            <div className="py-2">•</div>
-            <div className="p-2 whitespace-nowrap">
-              {formatWithCommas(volume)} volume
-            </div>
-          </Row>
+          <ContractDetails contract={contract} />
         </Col>
 
         <Col className="text-4xl mt-4 md:mt-2 md:ml-4 md:mr-6 text-primary items-end self-center md:self-start">

web/lib/firebase/contracts.ts

@@ -13,6 +13,7 @@ import {
   getDoc,
   limit,
 } from 'firebase/firestore'
+import dayjs from 'dayjs'
 
 export type Contract = {
   id: string // Chosen by creator; must be unique
@@ -35,6 +36,15 @@ export type Contract = {
   resolution?: 'YES' | 'NO' | 'CANCEL' // Chosen by creator; must be one of outcomes
 }
 
+export function compute(contract: Contract) {
+  const { pot, seedAmounts, createdTime } = contract
+  const volume = pot.YES + pot.NO - seedAmounts.YES - seedAmounts.NO
+  const prob = pot.YES ** 2 / (pot.YES ** 2 + pot.NO ** 2)
+  const probPercent = Math.round(prob * 100) + '%'
+  const createdDate = dayjs(createdTime).format('MMM D')
+  return { volume, probPercent, createdDate }
+}
+
 const db = getFirestore(app)
 const contractCollection = collection(db, 'contracts')
 

web/pages/markets.tsx

@@ -1,23 +1,31 @@
-import dayjs from 'dayjs'
 import Link from 'next/link'
 import React, { useEffect, useState } from 'react'
 import { Header } from '../components/header'
 import { Col } from '../components/layout/col'
 import { Row } from '../components/layout/row'
-import { Spacer } from '../components/layout/spacer'
 import { Title } from '../components/title'
-import { listAllContracts } from '../lib/firebase/contracts'
+import { compute, listAllContracts } from '../lib/firebase/contracts'
 import { Contract } from '../lib/firebase/contracts'
 import { formatWithCommas } from '../lib/util/format'
 
+export function ContractDetails(props: { contract: Contract }) {
+  const { contract } = props
+  const { volume, createdDate } = compute(contract)
+
+  return (
+    <Row className="flex-wrap text-sm text-gray-500">
+      <div className="whitespace-nowrap">By {contract.creatorName}</div>
+      <div className="mx-2">•</div>
+      <div className="whitespace-nowrap">{createdDate}</div>
+      <div className="mx-2">•</div>
+      <div className="whitespace-nowrap">{formatWithCommas(volume)} vol</div>
+    </Row>
+  )
+}
+
 function ContractCard(props: { contract: Contract }) {
   const { contract } = props
-
-  // Copied from contract-overview.tsx
-  const { pot, seedAmounts, createdTime } = contract
-  const volume = pot.YES + pot.NO - seedAmounts.YES - seedAmounts.NO
-  const prob = pot.YES ** 2 / (pot.YES ** 2 + pot.NO ** 2)
-  const probPercent = Math.round(prob * 100) + '%'
+  const { probPercent } = compute(contract)
 
   return (
     <Link href={`/contract/${contract.id}`}>
@@ -28,25 +36,12 @@ function ContractCard(props: { contract: Contract }) {
               <div className="flex justify-between gap-2">
                 {/* Left side of card */}
                 <div>
-                  <p className="font-medium text-indigo-700">
+                  <p className="font-medium text-indigo-700 mb-8">
                     {contract.question}
                   </p>
-                  <Spacer h={8} />
-                  {/* Copied from contract-overview.tsx */}
-                  <Row className="flex-wrap text-sm text-gray-500">
-                    <div className="whitespace-nowrap">
-                      By {contract.creatorName}
-                    </div>
-                    <div className="mx-2">•</div>
-                    <div className="whitespace-nowrap">
-                      {dayjs(createdTime).format('MMM D')}
-                    </div>
-                    <div className="mx-2">•</div>
-                    <div className="whitespace-nowrap">
-                      {formatWithCommas(volume)} vol
-                    </div>
-                  </Row>
+                  <ContractDetails contract={contract} />
                 </div>
+
                 {/* Right side of card */}
                 <Col>
                   <Col className="text-4xl mx-auto items-end">