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feat(machine): limit bill insertion to available balance

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Add billWithinBalance guard to state machine that rejects bills
exceeding the ATM's available sats. UI disables denomination buttons
and shows informational message when limit is reached.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Patrick Mulligan 2026-02-16 17:21:45 -05:00
commit 16159334a4
2 changed files with 45 additions and 2 deletions
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9
packages/state-machine/src/machine.ts
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@ -331,6 +331,14 @@ export function createATMMachine(services: Partial<ATMServices> = {}) {
canRetry: ({ context }) => context.retryCount < 3,
hasUserNpub: ({ context }) => context.userNpub !== null,
hasOfferRequest: ({ context }) => context.pendingOfferRequest !== null,
billWithinBalance: ({ context, event }) => {
if (event.type !== 'BILL_INSERTED') return false
if (context.availableBalance <= 0 || context.exchangeRate === 0) return true
const newFiatCents = context.fiatAmount + event.denomination * 100
const grossSats = Math.floor((newFiatCents / 100) * context.exchangeRate)
const fee = Math.floor(grossSats * context.feePercent)
return grossSats - fee <= context.availableBalance
},
// Cash-out guards
hasSelectedAmount: ({ context }) => context.cashOutSelection.length > 0,
canAddDenomination: ({ context, event }) => {
@ -392,6 +400,7 @@ export function createATMMachine(services: Partial<ATMServices> = {}) {
insertingBills: {
on: {
BILL_INSERTED: {
guard: 'billWithinBalance',
actions: ['addBill', 'calculateSats'],
},
BILL_REJECTED: {