145 lines
2.9 KiB
TypeScript
145 lines
2.9 KiB
TypeScript
import { Bet } from './bet'
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import { getDpmProbability } from './calculate-dpm'
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import {
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Binary,
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CPMM,
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DPM,
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FreeResponse,
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FullContract,
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Numeric,
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} from './contract'
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import { User } from './user'
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import { LiquidityProvision } from './liquidity-provision'
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import { noFees } from './fees'
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import * as _ from 'lodash'
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export const FIXED_ANTE = 100
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// deprecated
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export const PHANTOM_ANTE = 0.001
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export const MINIMUM_ANTE = 50
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export const HOUSE_LIQUIDITY_PROVIDER_ID = 'IPTOzEqrpkWmEzh6hwvAyY9PqFb2' // @ManifoldMarkets' id
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export function getCpmmInitialLiquidity(
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providerId: string,
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contract: FullContract<CPMM, Binary>,
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anteId: string,
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amount: number
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) {
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const { createdTime, p } = contract
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const lp: LiquidityProvision = {
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id: anteId,
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userId: providerId,
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contractId: contract.id,
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createdTime,
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isAnte: true,
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amount: amount,
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liquidity: amount,
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p: p,
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pool: { YES: 0, NO: 0 },
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}
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return lp
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}
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export function getAnteBets(
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creator: User,
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contract: FullContract<DPM, Binary>,
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yesAnteId: string,
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noAnteId: string
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) {
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const p = getDpmProbability(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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isAnte: true,
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fees: noFees,
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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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isAnte: true,
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fees: noFees,
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}
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return { yesBet, noBet }
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}
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export function getFreeAnswerAnte(
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creator: User,
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contract: FullContract<DPM, FreeResponse>,
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anteBetId: string
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) {
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const { totalBets, totalShares } = contract
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const amount = totalBets['0']
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const shares = totalShares['0']
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const { createdTime } = contract
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const anteBet: Bet = {
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id: anteBetId,
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userId: creator.id,
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contractId: contract.id,
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amount,
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shares,
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outcome: '0',
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probBefore: 0,
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probAfter: 1,
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createdTime,
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isAnte: true,
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fees: noFees,
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}
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return anteBet
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}
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export function getNumericAntes(
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creator: User,
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contract: FullContract<DPM, Numeric>,
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ante: number
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) {
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const { bucketCount, createdTime } = contract
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const betAnte = ante / bucketCount
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const betShares = Math.sqrt(ante ** 2 / bucketCount)
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return _.range(0, bucketCount).map((i) => {
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const anteBet: Omit<Bet, 'id'> = {
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userId: creator.id,
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contractId: contract.id,
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amount: betAnte,
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shares: betShares,
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outcome: i.toString(),
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probBefore: 0,
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probAfter: 1 / bucketCount,
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createdTime,
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isAnte: true,
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fees: noFees,
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}
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return anteBet
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})
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}
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