all the refactor

pkg/order/mutations.go

@@ -5,6 +5,7 @@ import (
 
 	"git.k6n.net/mats/go-cart-actor/pkg/actor"
 	messages "git.k6n.net/mats/go-cart-actor/proto/order"
+	"git.k6n.net/mats/platform/money"
 )
 
 // This file holds the mutation handlers. Each handler is the *only* place a
@@ -37,8 +38,8 @@ func HandlePlaceOrder(o *OrderGrain, m *messages.PlaceOrder) error {
 	o.Currency = m.GetCurrency()
 	o.Locale = m.GetLocale()
 	o.Country = m.GetCountry()
-	o.TotalAmount = m.GetTotalAmount()
-	o.TotalTax = m.GetTotalTax()
+	o.TotalAmount = money.Cents(m.GetTotalAmount())
+	o.TotalTax = money.Cents(m.GetTotalTax())
 	o.CustomerEmail = m.GetCustomerEmail()
 	o.CustomerName = m.GetCustomerName()
 	if b := m.GetBillingAddress(); len(b) > 0 {
@@ -54,10 +55,11 @@ func HandlePlaceOrder(o *OrderGrain, m *messages.PlaceOrder) error {
 			Sku:         l.GetSku(),
 			Name:        l.GetName(),
 			Quantity:    int(l.GetQuantity()),
-			UnitPrice:   l.GetUnitPrice(),
+			UnitPrice:   money.Cents(l.GetUnitPrice()),
 			TaxRate:     int(l.GetTaxRate()),
-			TotalAmount: l.GetTotalAmount(),
-			TotalTax:    l.GetTotalTax(),
+			TotalAmount: money.Cents(l.GetTotalAmount()),
+			TotalTax:    money.Cents(l.GetTotalTax()),
+			Location:    l.GetLocation(),
 		})
 	}
 	o.Status = StatusPending
@@ -74,7 +76,7 @@ func HandleAuthorizePayment(o *OrderGrain, m *messages.AuthorizePayment) error {
 	at := msToString(m.GetAtMs())
 	o.Payments = append(o.Payments, &Payment{
 		Provider:     m.GetProvider(),
-		Authorized:   m.GetAmount(),
+		Authorized:   money.Cents(m.GetAmount()),
 		AuthRef:      m.GetReference(),
 		AuthorizedAt: at,
 	})
@@ -93,10 +95,10 @@ func HandleCapturePayment(o *OrderGrain, m *messages.CapturePayment) error {
 		return fmt.Errorf("order: capture has no matching authorized payment")
 	}
 	at := msToString(m.GetAtMs())
-	p.Captured += m.GetAmount()
+	p.Captured += money.Cents(m.GetAmount())
 	p.CaptureRef = m.GetReference()
 	p.CapturedAt = at
-	o.CapturedAmount += m.GetAmount()
+	o.CapturedAmount += money.Cents(m.GetAmount())
 	o.Status = StatusCaptured
 	o.touch(at)
 	return nil
@@ -208,21 +210,21 @@ func HandleIssueRefund(o *OrderGrain, m *messages.IssueRefund) error {
 	if m.GetAmount() <= 0 {
 		return fmt.Errorf("order: refund amount must be positive")
 	}
-	if o.RefundedAmount+m.GetAmount() > o.CapturedAmount {
+	if o.RefundedAmount+money.Cents(m.GetAmount()) > o.CapturedAmount {
 		return fmt.Errorf("order: refund exceeds captured amount")
 	}
 	at := msToString(m.GetAtMs())
 	o.Refunds = append(o.Refunds, Refund{
 		Provider:  m.GetProvider(),
-		Amount:    m.GetAmount(),
+		Amount:    money.Cents(m.GetAmount()),
 		Reference: m.GetReference(),
 		ReturnID:  m.GetReturnId(),
 		IssuedAt:  at,
 	})
-	o.RefundedAmount += m.GetAmount()
+	o.RefundedAmount += money.Cents(m.GetAmount())
 	for _, p := range o.Payments {
 		if p.Provider == m.GetProvider() {
-			p.Refunded += m.GetAmount()
+			p.Refunded += money.Cents(m.GetAmount())
 			break
 		}
 	}
@@ -264,10 +266,10 @@ func HandleRequestExchange(o *OrderGrain, m *messages.RequestExchange) error {
 			Sku:         nl.GetSku(),
 			Name:        nl.GetName(),
 			Quantity:    int(nl.GetQuantity()),
-			UnitPrice:   nl.GetUnitPrice(),
+			UnitPrice:   money.Cents(nl.GetUnitPrice()),
 			TaxRate:     int(nl.GetTaxRate()),
-			TotalAmount: nl.GetTotalAmount(),
-			TotalTax:    nl.GetTotalTax(),
+			TotalAmount: money.Cents(nl.GetTotalAmount()),
+			TotalTax:    money.Cents(nl.GetTotalTax()),
 		}
 		ex.NewLines = append(ex.NewLines, line)
 		
@@ -296,14 +298,14 @@ func HandleEditOrderDetails(o *OrderGrain, m *messages.EditOrderDetails) error {
 		o.BillingAddress = append([]byte(nil), b...)
 	}
 
-	if sp := m.GetShippingPrice(); sp > 0 {
+	if sp := money.Cents(m.GetShippingPrice()); sp > 0 {
 		found := false
-		var oldTotal int64
+		var oldTotal money.Cents
 		for i := range o.Lines {
 			if o.Lines[i].Name == "Delivery" {
 				oldTotal = o.Lines[i].TotalAmount
 				o.Lines[i].UnitPrice = sp
-				o.Lines[i].TotalAmount = sp * int64(o.Lines[i].Quantity)
+				o.Lines[i].TotalAmount = sp.Mul(int64(o.Lines[i].Quantity))
 				o.Lines[i].TotalTax = ComputeTax(o.Lines[i].TotalAmount, o.Lines[i].TaxRate)
 				o.TotalAmount = o.TotalAmount - oldTotal + o.Lines[i].TotalAmount
 				found = true
@@ -317,9 +319,9 @@ func HandleEditOrderDetails(o *OrderGrain, m *messages.EditOrderDetails) error {
 				Name:        "Delivery",
 				Quantity:    1,
 				UnitPrice:   sp,
-				TaxRate:     25,
+				TaxRate:     2500, // 25% in basis points
 				TotalAmount: sp,
-				TotalTax:    ComputeTax(sp, 25),
+				TotalTax:    ComputeTax(sp, 2500),
 			}
 			o.Lines = append(o.Lines, line)
 			o.TotalAmount += sp