61 lines
1.4 KiB
TypeScript
61 lines
1.4 KiB
TypeScript
import { Bet } from './bet'
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import { getProbability } from './calculate'
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import { Contract } from './contract'
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import { User } from './user'
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export const PHANTOM_ANTE = 200
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export const calcStartPool = (initialProbInt: number, ante = 0) => {
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const p = initialProbInt / 100.0
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const totalAnte = PHANTOM_ANTE + ante
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const sharesYes = Math.sqrt(p * totalAnte ** 2)
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const sharesNo = Math.sqrt(totalAnte ** 2 - sharesYes ** 2)
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const poolYes = p * ante
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const poolNo = (1 - p) * ante
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const phantomYes = Math.sqrt(p) * PHANTOM_ANTE
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const phantomNo = Math.sqrt(1 - p) * PHANTOM_ANTE
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return { sharesYes, sharesNo, poolYes, poolNo, phantomYes, phantomNo }
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}
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export function getAnteBets(
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creator: User,
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contract: Contract,
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yesAnteId: string,
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noAnteId: string
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) {
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const p = getProbability(contract.totalShares)
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const ante = contract.totalBets.YES + contract.totalBets.NO
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const { createdTime } = contract
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const yesBet: Bet = {
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id: yesAnteId,
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userId: creator.id,
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contractId: contract.id,
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amount: p * ante,
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shares: Math.sqrt(p) * ante,
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outcome: 'YES',
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probBefore: p,
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probAfter: p,
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createdTime,
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}
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const noBet: Bet = {
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id: noAnteId,
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userId: creator.id,
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contractId: contract.id,
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amount: (1 - p) * ante,
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shares: Math.sqrt(1 - p) * ante,
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outcome: 'NO',
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probBefore: p,
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probAfter: p,
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createdTime,
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}
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return { yesBet, noBet }
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}
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