fb0e16d619
* Preview a slimmed-down version of /Create * Rework dropdown to be on bottom * Parse the close time as just before midnight * Prevent invalid contracts from being created * Prevent trading after contract has closed
68 lines
1.7 KiB
TypeScript
68 lines
1.7 KiB
TypeScript
import {
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Contract,
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getContractFromSlug,
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pushNewContract,
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} from '../firebase/contracts'
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import { User } from '../firebase/users'
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import { randomString } from '../util/random-string'
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import { slugify } from '../util/slugify'
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// consider moving to cloud function for security
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export async function createContract(
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question: string,
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description: string,
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initialProb: number,
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creator: User,
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closeTime?: number
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) {
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const proposedSlug = slugify(question).substring(0, 35)
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const preexistingContract = await getContractFromSlug(proposedSlug)
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const slug = preexistingContract
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? proposedSlug + '-' + randomString()
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: proposedSlug
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const { startYes, startNo } = calcStartPool(initialProb)
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const contract: Omit<Contract, 'id'> = {
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slug,
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outcomeType: 'BINARY',
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creatorId: creator.id,
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creatorName: creator.name,
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creatorUsername: creator.username,
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question: question.trim(),
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description: description.trim(),
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startPool: { YES: startYes, NO: startNo },
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pool: { YES: startYes, NO: startNo },
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totalShares: { YES: 0, NO: 0 },
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totalBets: { YES: 0, NO: 0 },
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isResolved: false,
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// TODO: Set create time to Firestore timestamp
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createdTime: Date.now(),
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lastUpdatedTime: Date.now(),
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}
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if (closeTime) {
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contract.closeTime = closeTime
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}
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return await pushNewContract(contract)
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}
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export function calcStartPool(initialProbInt: number, initialCapital = 200) {
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const p = initialProbInt / 100.0
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const startYes =
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p === 0.5
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? p * initialCapital
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: -(initialCapital * (-p + Math.sqrt((-1 + p) * -p))) / (-1 + 2 * p)
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const startNo = initialCapital - startYes
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return { startYes, startNo }
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}
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