42 lines
1.0 KiB
TypeScript
42 lines
1.0 KiB
TypeScript
import { Bet } from './bet'
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import { getProbability } from './calculate'
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import { Binary, FixedPayouts, FullContract } from './contract'
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export function calculateFixedPayout(
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contract: FullContract<FixedPayouts, Binary>,
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bet: Bet,
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outcome: string
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) {
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if (outcome === 'CANCEL') return calculateFixedCancelPayout(bet)
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if (outcome === 'MKT') return calculateFixedMktPayout(contract, bet)
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return calculateStandardFixedPayout(bet, outcome)
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}
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export function calculateFixedCancelPayout(bet: Bet) {
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return bet.amount
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}
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export function calculateStandardFixedPayout(bet: Bet, outcome: string) {
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const { outcome: betOutcome, shares } = bet
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if (betOutcome !== outcome) return 0
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return shares
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}
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function calculateFixedMktPayout(
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contract: FullContract<FixedPayouts, Binary>,
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bet: Bet
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) {
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const { resolutionProbability } = contract
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const p =
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resolutionProbability !== undefined
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? resolutionProbability
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: getProbability(contract)
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const { outcome, shares } = bet
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const betP = outcome === 'YES' ? p : 1 - p
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return betP * shares
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}
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