feat: automatic denom switcher

switches to sat denom of amount > x

change limit to 99

fixup change denom

src/Create.tsx

@@ -36,6 +36,7 @@ import {
     sendAmountFormatted,
     sendAmountValid,
     setAmountChanged,
+    setDenomination,
     setInvoice,
     setReceiveAmount,
     setReceiveAmountFormatted,
@@ -50,6 +51,7 @@ import { calculateReceiveAmount, calculateSendAmount } from "./utils/calculate";
 import {
     calculateDigits,
     convertAmount,
+    denominations,
     formatAmount,
     getValidationRegex,
 } from "./utils/denomination";
@@ -58,10 +60,19 @@ import { enableWebln } from "./utils/webln";
 const Create = () => {
     let receiveAmountRef: HTMLInputElement, sendAmountRef: HTMLInputElement;
 
+    // if btc and amount > 100, switch to sat
+    // user failed to notice the non satoshi denomination
+    const changeDenomination = (amount: number) => {
+        if (denomination() === denominations.btc && amount > 99) {
+            setDenomination(denominations.sat);
+        }
+    };
+
     const changeReceiveAmount = (evt: InputEvent) => {
         const target = evt.currentTarget as HTMLInputElement;
-        const amount = target.value.trim();
-        const satAmount = convertAmount(Number(amount), denomination());
+        const amount = Number(target.value.trim());
+        changeDenomination(amount);
+        const satAmount = convertAmount(amount, denomination());
         const sendAmount = calculateSendAmount(satAmount);
         setAmountChanged(sideReceive);
         setReceiveAmount(BigNumber(satAmount));
@@ -73,8 +84,9 @@ const Create = () => {
 
     const changeSendAmount = (evt: InputEvent) => {
         const target = evt.currentTarget as HTMLInputElement;
-        const amount = target.value.trim();
-        const satAmount = convertAmount(Number(amount), denomination());
+        const amount = Number(target.value.trim());
+        changeDenomination(amount);
+        const satAmount = convertAmount(amount, denomination());
         const receiveAmount = calculateReceiveAmount(satAmount);
         setAmountChanged(sideSend);
         setSendAmount(BigNumber(satAmount));