manifold/web/pages/activity.tsx

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import _ from 'lodash'
import { ContractFeed } from '../components/contract-feed'
import { Page } from '../components/page'
import { Contract } from '../lib/firebase/contracts'
import { Comment } from '../lib/firebase/comments'
import { Col } from '../components/layout/col'
import { Bet } from '../../common/bet'
const MAX_ACTIVE_CONTRACTS = 75
// This does NOT include comment times, since those aren't part of the contract atm.
// TODO: Maybe store last activity time directly in the contract?
// Pros: simplifies this code; cons: harder to tweak "activity" definition later
function lastActivityTime(contract: Contract) {
return Math.max(
contract.resolutionTime || 0,
contract.lastUpdatedTime,
contract.createdTime
)
}
// Types of activity to surface:
// - Comment on a market
// - New market created
// - Market resolved
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// - Markets with most betting in last 24 hours
export function findActiveContracts(
allContracts: Contract[],
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recentComments: Comment[],
recentBets: Bet[]
) {
const idToActivityTime = new Map<string, number>()
function record(contractId: string, time: number) {
// Only record if the time is newer
const oldTime = idToActivityTime.get(contractId)
idToActivityTime.set(contractId, Math.max(oldTime ?? 0, time))
}
let contracts: Contract[] = []
// Find contracts with activity in the last 3 days
const DAY_IN_MS = 24 * 60 * 60 * 1000
for (const contract of allContracts || []) {
contracts.push(contract)
record(contract.id, lastActivityTime(contract))
}
// Add every contract that had a recent comment, too
const contractsById = new Map(allContracts.map((c) => [c.id, c]))
for (const comment of recentComments) {
const contract = contractsById.get(comment.contractId)
if (contract) {
contracts.push(contract)
record(contract.id, comment.createdTime)
}
}
// Add contracts by last bet time.
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const contractBets = _.groupBy(recentBets, (bet) => bet.contractId)
const contractMostRecentBet = _.mapValues(
contractBets,
(bets) => _.maxBy(bets, (bet) => bet.createdTime) as Bet
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)
for (const bet of Object.values(contractMostRecentBet)) {
const contract = contractsById.get(bet.id)
if (contract) {
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contracts.push(contract)
record(contract.id, bet.createdTime)
}
}
contracts = _.uniqBy(contracts, (c) => c.id)
contracts = contracts.filter(
(contract) => contract.visibility === 'public' && !contract.isResolved
)
contracts = _.sortBy(contracts, (c) => -(idToActivityTime.get(c.id) ?? 0))
return contracts.slice(0, MAX_ACTIVE_CONTRACTS)
}
export function ActivityFeed(props: {
contracts: Contract[]
contractBets: Bet[][]
contractComments: Comment[][]
}) {
const { contracts, contractBets, contractComments } = props
return contracts.length > 0 ? (
<Col className="items-center">
<Col className="w-full max-w-3xl">
<Col className="w-full divide-y divide-gray-300 self-center bg-white">
{contracts.map((contract, i) => (
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<div key={contract.id} className="py-6 px-2 sm:px-4">
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<ContractFeed
contract={contract}
bets={contractBets[i]}
comments={contractComments[i]}
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feedType="activity"
/>
</div>
))}
</Col>
</Col>
</Col>
) : (
<></>
)
}
export default function ActivityPage() {
return (
<Page>
<ActivityFeed contracts={[]} contractBets={[]} contractComments={[]} />
</Page>
)
}