124 lines
2.6 KiB
TypeScript
124 lines
2.6 KiB
TypeScript
import { Bet } from './bet'
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import {
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calculateDpmShareValue,
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deductDpmFees,
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getDpmOutcomeProbability,
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} from './calculate-dpm'
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import { calculateCpmmSale, getCpmmProbability } from './calculate-cpmm'
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import { CPMMContract, DPMContract } from './contract'
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import { DPM_CREATOR_FEE, DPM_PLATFORM_FEE, Fees } from './fees'
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export type CandidateBet<T extends Bet> = Omit<T, 'id' | 'userId'>
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export const getSellBetInfo = (bet: Bet, contract: DPMContract) => {
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const { pool, totalShares, totalBets } = contract
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const { id: betId, amount, shares, outcome } = bet
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const adjShareValue = calculateDpmShareValue(contract, bet)
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const newPool = { ...pool, [outcome]: pool[outcome] - adjShareValue }
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const newTotalShares = {
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...totalShares,
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[outcome]: totalShares[outcome] - shares,
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}
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const newTotalBets = { ...totalBets, [outcome]: totalBets[outcome] - amount }
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const probBefore = getDpmOutcomeProbability(totalShares, outcome)
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const probAfter = getDpmOutcomeProbability(newTotalShares, outcome)
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const profit = adjShareValue - amount
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const creatorFee = DPM_CREATOR_FEE * Math.max(0, profit)
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const platformFee = DPM_PLATFORM_FEE * Math.max(0, profit)
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const fees: Fees = {
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creatorFee,
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platformFee,
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liquidityFee: 0,
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}
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const saleAmount = deductDpmFees(amount, adjShareValue)
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console.log(
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'SELL M$',
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amount,
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outcome,
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'for M$',
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saleAmount,
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'creator fee: M$',
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creatorFee
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)
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const newBet: CandidateBet<Bet> = {
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contractId: contract.id,
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amount: -adjShareValue,
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shares: -shares,
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outcome,
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probBefore,
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probAfter,
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createdTime: Date.now(),
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sale: {
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amount: saleAmount,
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betId,
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},
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fees,
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}
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return {
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newBet,
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newPool,
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newTotalShares,
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newTotalBets,
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fees,
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}
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}
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export const getCpmmSellBetInfo = (
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shares: number,
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outcome: 'YES' | 'NO',
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contract: CPMMContract,
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prevLoanAmount: number
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) => {
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const { pool, p } = contract
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const { saleValue, newPool, newP, fees } = calculateCpmmSale(
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contract,
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shares,
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outcome
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)
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const loanPaid = Math.min(prevLoanAmount, saleValue)
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const probBefore = getCpmmProbability(pool, p)
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const probAfter = getCpmmProbability(newPool, p)
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console.log(
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'SELL M$',
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shares,
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outcome,
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'for M$',
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saleValue,
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'creator fee: M$',
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fees.creatorFee
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)
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const newBet: CandidateBet<Bet> = {
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contractId: contract.id,
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amount: -saleValue,
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shares: -shares,
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outcome,
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probBefore,
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probAfter,
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createdTime: Date.now(),
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loanAmount: -loanPaid,
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fees,
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}
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return {
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newBet,
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newPool,
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newP,
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fees,
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}
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}
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