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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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38
apps/machine/src/views/CashInView.vue
View file

@ -114,6 +114,23 @@ function skipReceipt() {
atmStore.skipReceipt()
}
// Check if a bill denomination can still be accepted without exceeding available balance
function canAcceptBill(denomination: number): boolean {
const ctx = context.value
if (!ctx) return false
if (ctx.availableBalance <= 0 || ctx.exchangeRate === 0) return true
const newFiatCents = ctx.fiatAmount + denomination * 100
const grossSats = Math.floor((newFiatCents / 100) * ctx.exchangeRate)
const fee = Math.floor(grossSats * ctx.feePercent)
return grossSats - fee <= ctx.availableBalance
}
const balanceLimitReached = computed(() => {
if (!context.value || context.value.availableBalance <= 0) return false
// Check if even the smallest denomination ($1) would exceed
return !canAcceptBill(1)
})
// Simulate bill insertion (for development)
function simulateBill(denomination: number) {
atmStore.insertBill(denomination)
@ -210,10 +227,26 @@ const isProcessing = computed(() => atmStore.isPayingInvoice || atmStore.isReque
</div>
</div>
<!-- Available balance indicator -->
<div v-if="context && context.availableBalance > 0" class="flex justify-between text-sm">
<span class="text-muted-foreground">Available:</span>
<span :class="balanceLimitReached ? 'text-foreground' : 'text-muted-foreground'">
{{ formatSats(context.availableBalance) }} sats
</span>
</div>
<!-- Bill Acceptor Visual -->
<div class="rounded-lg border-2 border-dashed border-white/20 p-6 text-center">
<div class="mb-2 text-4xl">💵 ➡️ 🏧</div>
<p class="text-sm text-muted-foreground">Insert bills into the acceptor</p>
<div v-if="balanceLimitReached">
<div class="mb-2 text-4xl">💰</div>
<p class="text-sm text-muted-foreground">
Maximum amount reached — press Done to continue
</p>
</div>
<div v-else>
<div class="mb-2 text-4xl">💵 ➡️ 🏧</div>
<p class="text-sm text-muted-foreground">Insert bills into the acceptor</p>
</div>
</div>
<!-- Dev: Simulate bill insertion -->
@ -227,6 +260,7 @@ const isProcessing = computed(() => atmStore.isPayingInvoice || atmStore.isReque
variant="outline"
size="sm"
class="h-8"
:disabled="!canAcceptBill(denom)"
@click="simulateBill(denom)"
>
${{ denom }}