Merge pull request 'send with swap' (#102) from send-with-swap into master

Reviewed-on: #102

go.mod

@@ -5,7 +5,7 @@ go 1.23.4
 require (
 	git.defalsify.org/vise.git v0.3.2-0.20250528124150-03bf7bfc1b66
 	git.grassecon.net/grassrootseconomics/common v0.9.0-beta.1.0.20250417111317-2953f4c2f32e
-	git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251022084613-532547899f63
+	git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251028083421-fe897cca84f2
 	git.grassecon.net/grassrootseconomics/visedriver v0.9.0-beta.2.0.20250408094335-e2d1f65bb306
 	git.grassecon.net/grassrootseconomics/visedriver-africastalking v0.0.0-20250129070628-5a539172c694
 	github.com/alecthomas/assert/v2 v2.2.2

go.sum

@@ -24,6 +24,10 @@ git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251021120522-
 git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251021120522-6f7802b58cf5/go.mod h1:y/vsN8UO0wSxZk3gv0y5df4RPKMJI6TIxjVcVCPF8T8=
 git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251022084613-532547899f63 h1:yznaUXeAy+qiZb2nCxosYXE5HyCPpynIoplEuYV/zQM=
 git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251022084613-532547899f63/go.mod h1:y/vsN8UO0wSxZk3gv0y5df4RPKMJI6TIxjVcVCPF8T8=
+git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251028081048-a705443786fd h1:VIj5OdRae2wfE6NdLp6ZdHv0jtRbOeRURYQCU29RWBM=
+git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251028081048-a705443786fd/go.mod h1:y/vsN8UO0wSxZk3gv0y5df4RPKMJI6TIxjVcVCPF8T8=
+git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251028083421-fe897cca84f2 h1:wf//obTSLW5VZ0gM25l0U5oV/d+TBXX+1ClSMkEU7Uc=
+git.grassecon.net/grassrootseconomics/sarafu-api v0.9.0-beta.1.0.20251028083421-fe897cca84f2/go.mod h1:y/vsN8UO0wSxZk3gv0y5df4RPKMJI6TIxjVcVCPF8T8=
 git.grassecon.net/grassrootseconomics/visedriver v0.9.0-beta.2.0.20250408094335-e2d1f65bb306 h1:Jo+yWysWw/N5BJQtAyEMN8ePVvAyPHv+JG4lQti+1N4=
 git.grassecon.net/grassrootseconomics/visedriver v0.9.0-beta.2.0.20250408094335-e2d1f65bb306/go.mod h1:FdLwYtzsjOIcDiW4uDgDYnB4Wdzq12uJUe0QHSSPbSo=
 git.grassecon.net/grassrootseconomics/visedriver-africastalking v0.0.0-20250129070628-5a539172c694 h1:DjJlBSz0S13acft5XZDWk7ZYnzElym0xLMYEVgyNJ+E=

handlers/application/send.go

@@ -294,13 +294,14 @@ func (h *MenuHandlers) ResetTransactionAmount(ctx context.Context, sym string, i
 	}
 
 	flag_invalid_amount, _ := h.flagManager.GetFlag("flag_invalid_amount")
+	flag_swap_transaction, _ := h.flagManager.GetFlag("flag_swap_transaction")
 	store := h.userdataStore
 	err = store.WriteEntry(ctx, sessionId, storedb.DATA_AMOUNT, []byte(""))
 	if err != nil {
 		return res, nil
 	}
 
-	res.FlagReset = append(res.FlagReset, flag_invalid_amount)
+	res.FlagReset = append(res.FlagReset, flag_invalid_amount, flag_swap_transaction)
 
 	return res, nil
 }
@@ -321,6 +322,10 @@ func (h *MenuHandlers) MaxAmount(ctx context.Context, sym string, input []byte)
 	flag_swap_transaction, _ := h.flagManager.GetFlag("flag_swap_transaction")
 	userStore := h.userdataStore
 
+	code := codeFromCtx(ctx)
+	l := gotext.NewLocale(translationDir, code)
+	l.AddDomain("default")
+
 	// Fetch session data
 	transactionType, activeBal, activeSym, activeAddress, publicKey, activeDecimal, err := h.getSessionData(ctx, sessionId)
 	if err != nil {
@@ -330,10 +335,11 @@ func (h *MenuHandlers) MaxAmount(ctx context.Context, sym string, input []byte)
 	// Format the active balance amount to 2 decimal places
 	formattedBalance, _ := store.TruncateDecimalString(string(activeBal), 2)
 
-	// If normal transaction, return balance
+	// If normal transaction, or if the sym is max_amount, return balance
-	if string(transactionType) == "normal" {
+	if string(transactionType) == "normal" || sym == "max_amount" {
 		res.FlagReset = append(res.FlagReset, flag_swap_transaction)
-		res.Content = fmt.Sprintf("%s %s", formattedBalance, string(activeSym))
+
+		res.Content = l.Get("Maximum amount: %s %s\nEnter amount:", formattedBalance, string(activeSym))
 		return res, nil
 	}
 
@@ -363,37 +369,38 @@ func (h *MenuHandlers) MaxAmount(ctx context.Context, sym string, input []byte)
 			res.FlagSet = append(res.FlagSet, flag_api_error)
 			logg.ErrorCtxf(ctx, "failed on CheckTokenInPool", "error", err)
 		}
-		res.Content = fmt.Sprintf("%s %s", formattedBalance, string(activeSym))
+		res.FlagReset = append(res.FlagReset, flag_swap_transaction)
-		return res, err
+		res.Content = l.Get("Maximum amount: %s %s\nEnter amount:", formattedBalance, string(activeSym))
+		return res, nil
 	}
 
-	// Calculate max swappable amount
+	// retrieve the max credit send amounts
-	maxStr, err := h.calculateSwapMaxAmount(ctx, activePoolAddress, activeAddress, recipientActiveAddress, publicKey, activeDecimal)
+	maxSAT, maxRAT, err := h.calculateSendCreditLimits(ctx, activePoolAddress, activeAddress, recipientActiveAddress, publicKey, activeDecimal, recipientActiveDecimal)
 	if err != nil {
 		res.FlagSet = append(res.FlagSet, flag_api_error)
 		return res, err
 	}
 
 	// Fallback if below minimum
-	maxFloat, _ := strconv.ParseFloat(maxStr, 64)
+	maxFloat, _ := strconv.ParseFloat(maxSAT, 64)
 	if maxFloat < 0.1 {
-		res.Content = fmt.Sprintf("%s %s", formattedBalance, string(activeSym))
+		res.FlagReset = append(res.FlagReset, flag_swap_transaction)
+		res.Content = l.Get("Maximum amount: %s %s\nEnter amount:", formattedBalance, string(activeSym))
 		return res, nil
 	}
 
-	// Save max swap amount and return
+	// Save max RAT amount to be used in validating the user's input
-	err = userStore.WriteEntry(ctx, sessionId, storedb.DATA_ACTIVE_SWAP_MAX_AMOUNT, []byte(maxStr))
+	err = userStore.WriteEntry(ctx, sessionId, storedb.DATA_ACTIVE_SWAP_MAX_AMOUNT, []byte(maxRAT))
 	if err != nil {
-		logg.ErrorCtxf(ctx, "failed to write swap max amount", "value", maxStr, "error", err)
+		logg.ErrorCtxf(ctx, "failed to write swap max amount (maxRAT)", "value", maxRAT, "error", err)
 		return res, err
 	}
 
 	// save swap related data for the swap preview
 	metadata := &dataserviceapi.TokenHoldings{
-		TokenSymbol:   string(recipientActiveSym),
-		Balance:       formattedBalance, //not used
-		TokenDecimals: string(recipientActiveDecimal),
 		TokenAddress:  string(recipientActiveAddress),
+		TokenSymbol:   string(recipientActiveSym),
+		TokenDecimals: string(recipientActiveDecimal),
 	}
 
 	// Store the active swap_to data
@@ -402,7 +409,17 @@ func (h *MenuHandlers) MaxAmount(ctx context.Context, sym string, input []byte)
 		return res, err
 	}
 
-	res.Content = fmt.Sprintf("%s %s", maxStr, string(activeSym))
+	res.Content = l.Get(
+		"Credit Available: %s %s\n(You can swap up to %s %s -> %s %s).\nEnter %s amount:",
+		maxRAT,
+		string(recipientActiveSym),
+		maxSAT,
+		string(activeSym),
+		maxRAT,
+		string(recipientActiveSym),
+		string(recipientActiveSym),
+	)
+
 	return res, nil
 }
 
@@ -472,8 +489,8 @@ func (h *MenuHandlers) resolveActivePoolAddress(ctx context.Context, sessionId s
 	return nil, err
 }
 
-func (h *MenuHandlers) calculateSwapMaxAmount(ctx context.Context, poolAddress, fromAddress, toAddress, publicKey, decimal []byte) (string, error) {
+func (h *MenuHandlers) calculateSendCreditLimits(ctx context.Context, poolAddress, fromAddress, toAddress, publicKey, fromDecimal, toDecimal []byte) (string, string, error) {
-	swapLimit, err := h.accountService.GetSwapFromTokenMaxLimit(
+	creditSendMaxLimits, err := h.accountService.GetCreditSendMaxLimit(
 		ctx,
 		string(poolAddress),
 		string(fromAddress),
@@ -481,14 +498,17 @@ func (h *MenuHandlers) calculateSwapMaxAmount(ctx context.Context, poolAddress,
 		string(publicKey),
 	)
 	if err != nil {
-		logg.ErrorCtxf(ctx, "failed on GetSwapFromTokenMaxLimit", "error", err)
+		logg.ErrorCtxf(ctx, "failed on GetCreditSendMaxLimit", "error", err)
-		return "", err
+		return "", "", err
 	}
 
-	scaled := store.ScaleDownBalance(swapLimit.Max, string(decimal))
+	scaledSAT := store.ScaleDownBalance(creditSendMaxLimits.MaxSAT, string(fromDecimal))
+	formattedSAT, _ := store.TruncateDecimalString(string(scaledSAT), 2)
 
-	formattedAmount, _ := store.TruncateDecimalString(string(scaled), 2)
+	scaledRAT := store.ScaleDownBalance(creditSendMaxLimits.MaxRAT, string(toDecimal))
-	return formattedAmount, nil
+	formattedRAT, _ := store.TruncateDecimalString(string(scaledRAT), 2)
+
+	return formattedSAT, formattedRAT, nil
 }
 
 // ValidateAmount ensures that the given input is a valid amount and that
@@ -584,7 +604,7 @@ func (h *MenuHandlers) GetSender(ctx context.Context, sym string, input []byte)
 	return res, nil
 }
 
-// GetAmount retrieves the amount from teh Gdbm Db.
+// GetAmount retrieves the transaction amount from the store.
 func (h *MenuHandlers) GetAmount(ctx context.Context, sym string, input []byte) (resource.Result, error) {
 	var res resource.Result
 
@@ -677,6 +697,7 @@ func (h *MenuHandlers) TransactionSwapPreview(ctx context.Context, sym string, i
 		return res, fmt.Errorf("missing session")
 	}
 
+	// Input in RAT
 	inputStr := string(input)
 	if inputStr == "0" {
 		return res, nil
@@ -701,14 +722,15 @@ func (h *MenuHandlers) TransactionSwapPreview(ctx context.Context, sym string, i
 		return res, err
 	}
 
-	maxValue, err := strconv.ParseFloat(swapData.ActiveSwapMaxAmount, 64)
+	// use the stored max RAT
+	maxRATValue, err := strconv.ParseFloat(swapData.ActiveSwapMaxAmount, 64)
 	if err != nil {
 		logg.ErrorCtxf(ctx, "Failed to convert the swapMaxAmount to a float", "error", err)
 		return res, err
 	}
 
 	inputAmount, err := strconv.ParseFloat(inputStr, 64)
-	if err != nil || inputAmount > maxValue {
+	if err != nil || inputAmount > maxRATValue {
 		res.FlagSet = append(res.FlagSet, flag_invalid_amount)
 		res.Content = inputStr
 		return res, nil
@@ -722,36 +744,33 @@ func (h *MenuHandlers) TransactionSwapPreview(ctx context.Context, sym string, i
 		return res, nil
 	}
 
-	finalAmountStr, err := store.ParseAndScaleAmount(formattedAmount, swapData.ActiveSwapFromDecimal)
+	finalAmountStr, err := store.ParseAndScaleAmount(formattedAmount, swapData.ActiveSwapToDecimal)
 	if err != nil {
 		return res, err
 	}
 
-	err = userStore.WriteEntry(ctx, sessionId, storedb.DATA_ACTIVE_SWAP_AMOUNT, []byte(finalAmountStr))
+	// call the credit send API to get the reverse quote
-	if err != nil {
+	r, err := h.accountService.GetCreditSendReverseQuote(ctx, swapData.ActivePoolAddress, swapData.ActiveSwapFromAddress, swapData.ActiveSwapToAddress, finalAmountStr)
-		logg.ErrorCtxf(ctx, "failed to write swap amount entry with", "key", storedb.DATA_ACTIVE_SWAP_AMOUNT, "value", finalAmountStr, "error", err)
-		return res, err
-	}
-	
-	// call the API to get the quote
-	r, err := h.accountService.GetPoolSwapQuote(ctx, finalAmountStr, swapData.PublicKey, swapData.ActiveSwapFromAddress, swapData.ActivePoolAddress, swapData.ActiveSwapToAddress)
 	if err != nil {
 		flag_api_error, _ := h.flagManager.GetFlag("flag_api_call_error")
 		res.FlagSet = append(res.FlagSet, flag_api_error)
 		res.Content = l.Get("Your request failed. Please try again later.")
-		logg.ErrorCtxf(ctx, "failed on poolSwap", "error", err)
+		logg.ErrorCtxf(ctx, "failed GetCreditSendReverseQuote poolSwap", "error", err)
 		return res, nil
 	}
 
-	// store the outvalue as the final amount
+	sendInputAmount := r.InputAmount   // amount of SAT that should be swapped
-	err = userStore.WriteEntry(ctx, sessionId, storedb.DATA_AMOUNT, []byte(r.OutValue))
+	sendOutputAmount := r.OutputAmount // amount of RAT that will be received
+
+	// store the sendOutputAmount as the final amount (that will be sent)
+	err = userStore.WriteEntry(ctx, sessionId, storedb.DATA_AMOUNT, []byte(sendOutputAmount))
 	if err != nil {
-		logg.ErrorCtxf(ctx, "failed to write amount value entry with", "key", storedb.DATA_AMOUNT, "value", r.OutValue, "error", err)
+		logg.ErrorCtxf(ctx, "failed to write output amount value entry with", "key", storedb.DATA_AMOUNT, "value", sendOutputAmount, "error", err)
 		return res, err
 	}
 
-	// Scale down the quoted amount
+	// Scale down the quoted output amount
-	quoteAmountStr := store.ScaleDownBalance(r.OutValue, swapData.ActiveSwapToDecimal)
+	quoteAmountStr := store.ScaleDownBalance(sendOutputAmount, swapData.ActiveSwapToDecimal)
 
 	// Format the qouteAmount amount to 2 decimal places
 	qouteAmount, _ := store.TruncateDecimalString(quoteAmountStr, 2)
@@ -763,7 +782,14 @@ func (h *MenuHandlers) TransactionSwapPreview(ctx context.Context, sym string, i
 		return res, err
 	}
 
-	res.Content = fmt.Sprintf(
+	// store the sendInputAmount as the swap amount
+	err = userStore.WriteEntry(ctx, sessionId, storedb.DATA_ACTIVE_SWAP_AMOUNT, []byte(sendInputAmount))
+	if err != nil {
+		logg.ErrorCtxf(ctx, "failed to write swap amount entry with", "key", storedb.DATA_ACTIVE_SWAP_AMOUNT, "value", sendInputAmount, "error", err)
+		return res, err
+	}
+
+	res.Content = l.Get(
 		"%s will receive %s %s",
 		string(recipientPhoneNumber), qouteAmount, swapData.ActiveSwapToSym,
 	)

handlers/local.go

@@ -86,6 +86,7 @@ func (ls *LocalHandlerService) GetHandler(accountService remote.AccountService)
 	ls.DbRs.AddLocalFunc("transaction_reset", appHandlers.TransactionReset)
 	ls.DbRs.AddLocalFunc("invite_valid_recipient", appHandlers.InviteValidRecipient)
 	ls.DbRs.AddLocalFunc("max_amount", appHandlers.MaxAmount)
+	ls.DbRs.AddLocalFunc("credit_max_amount", appHandlers.MaxAmount)
 	ls.DbRs.AddLocalFunc("validate_amount", appHandlers.ValidateAmount)
 	ls.DbRs.AddLocalFunc("reset_transaction_amount", appHandlers.ResetTransactionAmount)
 	ls.DbRs.AddLocalFunc("get_recipient", appHandlers.GetRecipient)

services/registration/amount

@@ -1,2 +1 @@
-Maximum amount: {{.max_amount}}
+{{.max_amount}}
-Enter amount:

services/registration/amount.vis

@@ -1,12 +1,9 @@
-LOAD reset_transaction_amount 0
+LOAD reset_transaction_amount 10
-LOAD max_amount 40
+LOAD max_amount 160
 RELOAD max_amount
 MAP max_amount
 MOUT back 0
 HALT
-LOAD clear_trans_type_flag 6
-RELOAD clear_trans_type_flag
-CATCH transaction_swap flag_swap_transaction 1
 LOAD validate_amount 64
 RELOAD validate_amount
 CATCH api_failure flag_api_call_error 1

services/registration/amount_swa

@@ -1,2 +1 @@
-Kiwango cha juu: {{.max_amount}}
+{{.max_amount}}
-Weka kiwango:

services/registration/credit_amount

@@ -0,0 +1 @@
+{{.credit_max_amount}}

services/registration/credit_amount.vis

@@ -0,0 +1,18 @@
+LOAD reset_transaction_amount 10
+LOAD credit_max_amount 160
+RELOAD credit_max_amount
+MAP credit_max_amount
+MOUT back 0
+HALT
+LOAD clear_trans_type_flag 6
+RELOAD clear_trans_type_flag
+CATCH transaction_swap flag_swap_transaction 1
+LOAD validate_amount 64
+RELOAD validate_amount
+CATCH api_failure flag_api_call_error 1
+CATCH invalid_amount flag_invalid_amount 1
+INCMP _ 0
+LOAD get_recipient 0
+LOAD get_sender 64
+LOAD get_amount 32
+INCMP transaction_pin *

services/registration/credit_amount_swa

@@ -0,0 +1 @@
+{{.credit_max_amount}}

services/registration/credit_send

@@ -0,0 +1 @@
+Enter recipient's phone number/address/alias:

services/registration/credit_send.vis

@@ -0,0 +1,12 @@
+LOAD transaction_reset 0
+RELOAD transaction_reset
+CATCH no_voucher flag_no_active_voucher 1
+MOUT back 0
+HALT
+LOAD validate_recipient 50
+RELOAD validate_recipient
+CATCH api_failure flag_api_call_error  1
+CATCH invalid_recipient flag_invalid_recipient 1
+CATCH invite_recipient flag_invalid_recipient_with_invite 1
+INCMP _ 0
+INCMP credit_amount *

services/registration/credit_send_menu

@@ -0,0 +1 @@
+Credit-Send

services/registration/credit_send_menu_swa

@@ -0,0 +1 @@
+Tuma-Mkopo

services/registration/credit_send_swa

@@ -0,0 +1 @@
+Weka nambari ya simu/anwani/lakabu:

services/registration/invalid_credit_send_amount

@@ -0,0 +1 @@
+Amount {{.transaction_swap_preview}} is invalid, please try again:

services/registration/invalid_credit_send_amount.vis

@@ -0,0 +1,7 @@
+MAP transaction_swap_preview
+RELOAD reset_transaction_amount
+MOUT retry 1
+MOUT quit 9
+HALT
+INCMP ^ 1
+INCMP quit 9

services/registration/invalid_credit_send_amount_swa

@@ -0,0 +1 @@
+Kiwango {{.transaction_swap_preview}} sio sahihi, tafadhali weka tena:

services/registration/locale/swa/default.po

@@ -45,3 +45,12 @@ msgstr "Jina: %s\nSarafu: %s"
 
 msgid "Only USD vouchers are allowed to mpesa.sarafu.eth."
 msgstr "Ni sarafu za USD pekee zinazoruhusiwa kwa mpesa.sarafu.eth."
+
+msgid "Maximum amount: %s %s\nEnter amount:"
+msgstr "Kiwango cha juu: %s %s\nWeka kiwango:"
+
+msgid "Credit Available: %s %s\n(You can swap up to %s %s -> %s %s).\nEnter %s amount:"
+msgstr "Kiwango kinachopatikana: %s %s\n(Unaweza kubadilisha hadi %s %s -> %s %s)\nWeka kiwango cha %s:"
+
+msgid "%s will receive %s %s"
+msgstr "%s atapokea %s %s"

services/registration/main.vis

@@ -7,18 +7,20 @@ LOAD check_balance 128
 RELOAD check_balance
 MAP check_balance
 MOUT send 1
-MOUT swap 2
+MOUT credit_send 2
-MOUT vouchers 3
+MOUT swap 3
-MOUT select_pool 4
+MOUT vouchers 4
-MOUT account 5
+MOUT select_pool 5
-MOUT help 6
+MOUT account 6
+MOUT help 7
 MOUT quit 9
 HALT
 INCMP send 1
-INCMP swap_to_list 2
+INCMP credit_send 2
-INCMP my_vouchers 3
+INCMP swap_to_list 3
-INCMP select_pool 4
+INCMP my_vouchers 4
-INCMP my_account 5
+INCMP select_pool 5
-INCMP help 6
+INCMP my_account 6
+INCMP help 7
 INCMP quit 9
 INCMP . *

services/registration/select_pool.vis

@@ -1,5 +1,6 @@
 CATCH no_voucher flag_no_active_voucher 1
 LOAD get_pools 0
+RELOAD get_pools
 MAP get_pools
 LOAD get_default_pool 20
 RELOAD get_default_pool

services/registration/send_swa

@@ -1 +1 @@
-Weka nambari ya simu:
+Weka nambari ya simu/Anwani/Lakabu:

services/registration/transaction_swap.vis

@@ -1,6 +1,7 @@
 LOAD transaction_swap_preview 0
 MAP transaction_swap_preview
 CATCH api_failure flag_api_call_error 1
+CATCH invalid_credit_send_amount flag_invalid_amount 1
 MOUT back 0
 MOUT quit 9
 LOAD authorize_account 6

services/registration/transaction_swap_swa

@@ -0,0 +1,3 @@
+{{.transaction_swap_preview}}
+
+Tafadhali weka PIN yako kudhibitisha:

store/swap.go

@@ -173,9 +173,9 @@ func UpdateSwapToVoucherData(ctx context.Context, store DataStore, sessionId str
 	logg.InfoCtxf(ctx, "UpdateSwapToVoucherData", "data", data)
 	// Active swap to voucher data entries
 	activeEntries := map[storedb.DataTyp][]byte{
+		storedb.DATA_ACTIVE_SWAP_TO_ADDRESS: []byte(data.TokenAddress),
 		storedb.DATA_ACTIVE_SWAP_TO_SYM:     []byte(data.TokenSymbol),
 		storedb.DATA_ACTIVE_SWAP_TO_DECIMAL: []byte(data.TokenDecimals),
-		storedb.DATA_ACTIVE_SWAP_TO_ADDRESS: []byte(data.TokenAddress),
 	}
 
 	// Write active data

store/tokens.go

@@ -7,6 +7,7 @@ import (
 	"math/big"
 	"reflect"
 	"strconv"
+	"strings"
 
 	storedb "git.grassecon.net/grassrootseconomics/sarafu-vise/store/db"
 )
@@ -21,25 +22,34 @@ type TransactionData struct {
 	ActiveAddress  string
 }
 
-// TruncateDecimalString safely truncates the input amount to the specified decimal places
+// TruncateDecimalString safely truncates (not rounds) a number string to the specified decimal places
 func TruncateDecimalString(input string, decimalPlaces int) (string, error) {
-	num, ok := new(big.Float).SetString(input)
+	if _, err := strconv.ParseFloat(input, 64); err != nil {
-	if !ok {
 		return "", fmt.Errorf("invalid input")
 	}
 
-	// Multiply by 10^decimalPlaces
+	// Split input into integer and fractional parts
-	scale := new(big.Float).SetInt(new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(decimalPlaces)), nil))
+	parts := strings.SplitN(input, ".", 2)
-	scaled := new(big.Float).Mul(num, scale)
+	intPart := parts[0]
+	var fracPart string
 
-	// Truncate by converting to int (chops off decimals)
+	if len(parts) == 2 {
-	intPart, _ := scaled.Int(nil)
+		fracPart = parts[1]
+	}
 
-	// Divide back to get truncated float
+	// Truncate or pad fractional part
-	truncated := new(big.Float).Quo(new(big.Float).SetInt(intPart), scale)
+	if len(fracPart) > decimalPlaces {
+		fracPart = fracPart[:decimalPlaces]
+	} else {
+		fracPart = fracPart + strings.Repeat("0", decimalPlaces-len(fracPart))
+	}
 
-	// Format with fixed decimals
+	// Handle zero decimal places
-	return truncated.Text('f', decimalPlaces), nil
+	if decimalPlaces == 0 {
+		return intPart, nil
+	}
+
+	return fmt.Sprintf("%s.%s", intPart, fracPart), nil
 }
 
 func ParseAndScaleAmount(storedAmount, activeDecimal string) (string, error) {

store/tokens_test.go

@@ -22,6 +22,13 @@ func TestTruncateDecimalString(t *testing.T) {
 			want:          "4.00",
 			expectError:   false,
 		},
+		{
+			name:          "precision test",
+			input:         "2.1",
+			decimalPlaces: 2,
+			want:          "2.10",
+			expectError:   false,
+		},
 		{
 			name:          "single decimal",
 			input:         "4.1",