change default buy token to sol if sell token is usdc

components/swap/SellTokenInput.tsx

@@ -14,7 +14,6 @@ import MaxSwapAmount from './MaxSwapAmount'
 import useUnownedAccount from 'hooks/useUnownedAccount'
 import InlineNotification from '@components/shared/InlineNotification'
 import useMangoAccount from 'hooks/useMangoAccount'
-import { useWallet } from '@solana/wallet-adapter-react'
 import { toUiDecimalsForQuote } from '@blockworks-foundation/mango-v4'
 
 const SellTokenInput = ({
@@ -34,7 +33,6 @@ const SellTokenInput = ({
 }) => {
   const { t } = useTranslation('common')
   const { mangoAccountAddress } = useMangoAccount()
-  const { connected } = useWallet()
   const { group } = useMangoGroup()
   const { isUnownedAccount } = useUnownedAccount()
   const {
@@ -48,7 +46,7 @@ const SellTokenInput = ({
     const mangoAccount = mangoStore.getState().mangoAccount.current
     return group && mangoAccount
       ? toUiDecimalsForQuote(mangoAccount.getCollateralValue(group))
-      : 0
+      : 10
   }, [mangoAccountAddress])
 
   return (
@@ -98,7 +96,7 @@ const SellTokenInput = ({
           </span>
         ) : null}
       </div>
-      {connected && freeCollateral <= 0 ? (
+      {mangoAccountAddress && freeCollateral <= 0 ? (
         <div className="col-span-2 mt-1 flex justify-center">
           <InlineNotification
             type="warning"

components/swap/SwapForm.tsx

@@ -105,12 +105,13 @@ const SwapForm = () => {
       setSwapOrLimit(orderType)
       if (orderType !== 'swap' && outputBank?.name === OUTPUT_TOKEN_DEFAULT) {
         const { group } = mangoStore.getState()
+        const outputBankName = inputBank?.name === 'USDC' ? 'SOL' : 'USDC'
         set((state) => {
-          state.swap.outputBank = group?.banksMapByName.get('USDC')?.[0]
+          state.swap.outputBank = group?.banksMapByName.get(outputBankName)?.[0]
         })
       }
     },
-    [outputBank, set, setSwapOrLimit],
+    [inputBank, outputBank, set, setSwapOrLimit],
   )
 
   const handleSetMargin = () => {