79 lines
1.8 KiB
TypeScript
79 lines
1.8 KiB
TypeScript
import { Bet } from './bet'
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import { calculateShareValue, getProbability } from './calculate'
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import { Contract } from './contract'
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import { CREATOR_FEE, FEES } from './fees'
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import { User } from './user'
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export const getSellBetInfo = (
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user: User,
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bet: Bet,
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contract: Contract,
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newBetId: string
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) => {
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const { id: betId, amount, shares, outcome } = bet
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const { YES: yesPool, NO: noPool } = contract.pool
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const { YES: yesShares, NO: noShares } = contract.totalShares
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const { YES: yesBets, NO: noBets } = contract.totalBets
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const adjShareValue = calculateShareValue(contract, bet)
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const newPool =
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outcome === 'YES'
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? { YES: yesPool - adjShareValue, NO: noPool }
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: { YES: yesPool, NO: noPool - adjShareValue }
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const newTotalShares =
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outcome === 'YES'
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? { YES: yesShares - shares, NO: noShares }
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: { YES: yesShares, NO: noShares - shares }
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const newTotalBets =
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outcome === 'YES'
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? { YES: yesBets - amount, NO: noBets }
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: { YES: yesBets, NO: noBets - amount }
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const probBefore = getProbability(contract.totalShares)
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const probAfter = getProbability(newTotalShares)
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const creatorFee = 2 * CREATOR_FEE * adjShareValue
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const saleAmount = (1 - 2 * FEES) * 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: Bet = {
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id: newBetId,
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userId: user.id,
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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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}
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const newBalance = user.balance + saleAmount
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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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newBalance,
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creatorFee,
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}
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}
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