From e35764950b59bde6e36bdfad1ca671eef564a6d1 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Thu, 8 Oct 2026 16:34:06 -0700
Subject: Max fills the amount in the unit the field shows: in fiat that's
 money floored to the cent (so it never parses back above the maximum), not a
 BTC figure under a CAD label. One ctx.amountField helper for the ark send/LN
 Max, the gift Max and fixed-amount zap/BOLT 12 fills

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 src/features/ark.js   | 4 ++--
 src/features/gifts.js | 2 +-
 src/features/zaps.js  | 8 ++++----
 3 files changed, 7 insertions(+), 7 deletions(-)

(limited to 'src/features')

diff --git a/src/features/ark.js b/src/features/ark.js
index 90b2a01..d5b6e7f 100644
--- a/src/features/ark.js
+++ b/src/features/ark.js
@@ -1223,7 +1223,7 @@ export function arkFeature(ctx) {
     }
     return Math.max(0, amt);
   }
-  const amountFill = (sat) => (ctx.getUnit() === 'sats' ? String(sat) : (sat / 1e8).toFixed(8));
+  const amountFill = (sat) => ctx.amountField(sat);
 
   // Auto-pay progress + success as ONE structurally identical card, so the
   // paying → paid step is a class flip (spinner ring settles into the green
@@ -3651,7 +3651,7 @@ export function arkFeature(ctx) {
         ? (arkBalance()?.spendableSat || 0)
         : maxBoardSat();
       if (!sat) return null;
-      return ctx.getUnit() === 'sats' ? String(sat) : (sat / 1e8).toFixed(8);
+      return ctx.amountField(sat);
     },
     sendFormNote(a) {
       if (!isArkAddress(a)) return null;
diff --git a/src/features/gifts.js b/src/features/gifts.js
index 052a107..4d68a50 100644
--- a/src/features/gifts.js
+++ b/src/features/gifts.js
@@ -675,7 +675,7 @@ export function giftsFeature(ctx) {
               return h('div', { class: 'input-group' },
                 h('input', { type: 'number', step: getUnit() === 'sats' ? '1' : '0.00000001', min: '0', inputmode: 'decimal', placeholder: t('giftAmountLabel'),
                   disabled: ui.giftMax,
-                  value: ui.giftMax ? (getUnit() === 'sats' ? String(maxVal) : fmtBtc(maxVal)) : ui.giftAmount,
+                  value: ui.giftMax ? ctx.amountField(maxVal) : ui.giftAmount,
                   onInput: (e) => (ui.giftAmount = e.target.value) }),
                 h('button', { type: 'button', class: ui.giftMax ? 'btn-primary' : '', onClick: () => { ui.giftMax = !ui.giftMax; ui.giftError = ''; render(); } }, t('max')),
                 h('div', { style: 'display:flex;align-items:center' }, unitTag())
diff --git a/src/features/zaps.js b/src/features/zaps.js
index a23ecdd..d327f9d 100644
--- a/src/features/zaps.js
+++ b/src/features/zaps.js
@@ -94,7 +94,7 @@ export function zapsFeature(ctx) {
       const off = target.offer;
       if (off.currency) throw new Error(t('bolt12Currency', { currency: off.currency }));
       const fixedSat = off.amountMsat ? Number((off.amountMsat + 999n) / 1000n) : null;
-      if (fixedSat) z.amount = getUnit() === 'sats' ? String(fixedSat) : (fixedSat / 1e8).toFixed(8);
+      if (fixedSat) z.amount = ctx.amountField(fixedSat);
       z.params = { minSendable: 1000, maxSendable: 21e15, commentAllowed: 0, allowsNostr: false, fixedSat };
       z.status = 'ready';
       render();
@@ -118,7 +118,7 @@ export function zapsFeature(ctx) {
         return;
       }
       const fixedSat = n.priceType === 0 && n.priceSats ? n.priceSats : null;
-      if (fixedSat) z.amount = getUnit() === 'sats' ? String(fixedSat) : (fixedSat / 1e8).toFixed(8);
+      if (fixedSat) z.amount = ctx.amountField(fixedSat);
       z.params = { minSendable: 1000, maxSendable: 21e15, commentAllowed: 100, allowsNostr: false, fixedSat };
       z.status = 'ready';
       render();
@@ -165,7 +165,7 @@ export function zapsFeature(ctx) {
     // exactly like a fixed-amount BOLT 12 offer.
     if (params.minSendable === params.maxSendable && params.minSendable >= 1000) {
       params.fixedSat = Math.ceil(params.minSendable / 1000);
-      z.amount = getUnit() === 'sats' ? String(params.fixedSat) : (params.fixedSat / 1e8).toFixed(8);
+      z.amount = ctx.amountField(params.fixedSat);
     }
     z.params = params;
     z.status = 'ready';
@@ -363,7 +363,7 @@ export function zapsFeature(ctx) {
           !p.fixedSat && (hook('lnMaxSendSat') || 0) > 0
             ? h('button', { type: 'button', onClick: () => {
                 const sat = hook('lnMaxSendSat');
-                z.amount = getUnit() === 'sats' ? String(sat) : (sat / 1e8).toFixed(8);
+                z.amount = ctx.amountField(sat);
                 render();
               } }, t('max'))
             : null,
-- 
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