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Redeem shares pays back loans first

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This commit is contained in:
James Grugett 2022-03-10 15:26:00 -06:00
parent b515ca8bd0
commit 864b4420ad
1 changed files with 7 additions and 1 deletions
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8
functions/src/redeem-shares.ts
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@ -32,6 +32,10 @@ export const redeemShares = async (userId: string, contractId: string) => {
const amount = Math.min(yesShares, noShares) const amount = Math.min(yesShares, noShares)
if (amount <= 0) return if (amount <= 0) return
const prevLoanAmount = _.sumBy(bets, (bet) => bet.loanAmount ?? 0)
const loanPaid = Math.min(prevLoanAmount, amount)
const netAmount = amount - loanPaid
const p = getProbability(contract) const p = getProbability(contract)
const createdTime = Date.now() const createdTime = Date.now()
@ -42,6 +46,7 @@ export const redeemShares = async (userId: string, contractId: string) => {
contractId: contract.id, contractId: contract.id,
amount: p * -amount, amount: p * -amount,
shares: -amount, shares: -amount,
loanAmount: loanPaid ? -loanPaid / 2 : 0,
outcome: 'YES', outcome: 'YES',
probBefore: p, probBefore: p,
probAfter: p, probAfter: p,
@ -57,6 +62,7 @@ export const redeemShares = async (userId: string, contractId: string) => {
contractId: contract.id, contractId: contract.id,
amount: (1 - p) * -amount, amount: (1 - p) * -amount,
shares: -amount, shares: -amount,
loanAmount: loanPaid ? -loanPaid / 2 : 0,
outcome: 'NO', outcome: 'NO',
probBefore: p, probBefore: p,
probAfter: p, probAfter: p,
@ -71,7 +77,7 @@ export const redeemShares = async (userId: string, contractId: string) => {
const user = userSnap.data() as User const user = userSnap.data() as User
const newBalance = user.balance + amount const newBalance = user.balance + netAmount
transaction.update(userDoc, { balance: newBalance }) transaction.update(userDoc, { balance: newBalance })
transaction.create(yesDoc, yesBet) transaction.create(yesDoc, yesBet)