all the refactor

pkg/cart/tax_nordic.go

@@ -1,55 +1,13 @@
 package cart
 
-// NordicTaxProvider implements TaxProvider for the Nordic countries
-// (SE, NO, DK, FI). It encodes the standard statutory VAT rates:
-//
-//	SE:  25 % (standard), 12 % (food, hotels), 6 % (books, transport)
-//	NO:  25 % (standard), 15 % (food),        12 %
-//	DK:  25 % (standard)
-//	FI:  25 % (standard; actual rate is 25.5 % as of 2026)
-//
-// All rates are raw percent (25 = 25 %). Fractional rates (FI 25.5) are
-// truncated to the nearest integer per the raw-percent convention.
-//
-// NordicTaxProvider does not make network calls — all logic is local math.
-// An external provider (Avalara, TaxJar) can be added by implementing
-// TaxProvider and switching on TAX_PROVIDER.
-type NordicTaxProvider struct {
-	defaultCountry string
-}
+import "git.k6n.net/mats/platform/tax"
 
-// NewNordicTaxProvider returns a NordicTaxProvider. defaultCountry is used
-// when DefaultTaxRate is called with an empty country code; it defaults to
-// "SE" if empty.
+// NordicTaxProvider implements TaxProvider for the Nordic countries.
+// The canonical definition is now in platform/tax; this is a type alias
+// for backward compatibility.
+type NordicTaxProvider = tax.Nordic
+
+// NewNordicTaxProvider returns a new NordicTaxProvider.
 func NewNordicTaxProvider(defaultCountry string) *NordicTaxProvider {
-	if defaultCountry == "" {
-		defaultCountry = "SE"
-	}
-	return &NordicTaxProvider{defaultCountry: defaultCountry}
-}
-
-var _ TaxProvider = (*NordicTaxProvider)(nil)
-
-func (p *NordicTaxProvider) Name() string { return "nordic" }
-
-func (p *NordicTaxProvider) ComputeTax(total int64, taxRate int) int64 {
-	return ComputeTax(total, taxRate)
-}
-
-// nordicStandardRates maps country code → default standard VAT rate (raw percent).
-var nordicStandardRates = map[string]int{
-	"SE": 25,
-	"NO": 25,
-	"DK": 25,
-	"FI": 25,
-}
-
-func (p *NordicTaxProvider) DefaultTaxRate(country string) int {
-	if country == "" {
-		country = p.defaultCountry
-	}
-	if rate, ok := nordicStandardRates[country]; ok {
-		return rate
-	}
-	return nordicStandardRates[p.defaultCountry]
+	return tax.NewNordic(defaultCountry)
 }