first commit

internal/currency/currency.go

@@ -0,0 +1,159 @@
+package currency
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Currency represents a currency with its details
+type Currency struct {
+	Code   string
+	Name   string
+	Symbol string
+}
+
+// SupportedCurrencies returns a list of supported currencies
+func SupportedCurrencies() []Currency {
+	return []Currency{
+		{Code: "EUR", Name: "Euro", Symbol: "€"},
+		{Code: "USD", Name: "US Dollar", Symbol: "$"},
+		{Code: "GBP", Name: "British Pound", Symbol: "£"},
+		{Code: "CHF", Name: "Swiss Franc", Symbol: "CHF"},
+		{Code: "SEK", Name: "Swedish Krona", Symbol: "kr"},
+		{Code: "NOK", Name: "Norwegian Krone", Symbol: "kr"},
+		{Code: "DKK", Name: "Danish Krone", Symbol: "kr"},
+		{Code: "PLN", Name: "Polish Zloty", Symbol: "zł"},
+		{Code: "CZK", Name: "Czech Koruna", Symbol: "Kč"},
+		{Code: "HUF", Name: "Hungarian Forint", Symbol: "Ft"},
+		{Code: "CAD", Name: "Canadian Dollar", Symbol: "C$"},
+		{Code: "AUD", Name: "Australian Dollar", Symbol: "A$"},
+		{Code: "JPY", Name: "Japanese Yen", Symbol: "¥"},
+		{Code: "CNY", Name: "Chinese Yuan", Symbol: "¥"},
+		{Code: "RUB", Name: "Russian Ruble", Symbol: "₽"},
+		{Code: "BRL", Name: "Brazilian Real", Symbol: "R$"},
+		{Code: "MXN", Name: "Mexican Peso", Symbol: "$"},
+		{Code: "INR", Name: "Indian Rupee", Symbol: "₹"},
+		{Code: "KRW", Name: "South Korean Won", Symbol: "₩"},
+		{Code: "SGD", Name: "Singapore Dollar", Symbol: "S$"},
+		{Code: "HKD", Name: "Hong Kong Dollar", Symbol: "HK$"},
+		{Code: "NZD", Name: "New Zealand Dollar", Symbol: "NZ$"},
+		{Code: "ZAR", Name: "South African Rand", Symbol: "R"},
+		{Code: "TRY", Name: "Turkish Lira", Symbol: "₺"},
+		{Code: "ILS", Name: "Israeli Shekel", Symbol: "₪"},
+	}
+}
+
+// GetCurrency returns a currency by its code
+func GetCurrency(code string) (*Currency, bool) {
+	code = strings.ToUpper(code)
+	for _, currency := range SupportedCurrencies() {
+		if currency.Code == code {
+			return &currency, true
+		}
+	}
+	return nil, false
+}
+
+// GetCurrencySymbol returns the symbol for a currency code
+func GetCurrencySymbol(code string) string {
+	if currency, exists := GetCurrency(code); exists {
+		return currency.Symbol
+	}
+	return code // fallback to code if currency not found
+}
+
+// GetCurrencyName returns the name for a currency code
+func GetCurrencyName(code string) string {
+	if currency, exists := GetCurrency(code); exists {
+		return currency.Name
+	}
+	return code // fallback to code if currency not found
+}
+
+// FormatPrice formats a price with the appropriate currency symbol
+func FormatPrice(amount float64, currencyCode string) string {
+	symbol := GetCurrencySymbol(currencyCode)
+
+	// Handle currencies with different formatting conventions
+	switch strings.ToUpper(currencyCode) {
+	case "EUR", "GBP", "CHF":
+		return fmt.Sprintf("%s%.2f", symbol, amount)
+	case "USD", "CAD", "AUD", "HKD", "SGD", "NZD", "BRL", "MXN":
+		return fmt.Sprintf("%s%.2f", symbol, amount)
+	case "JPY", "KRW":
+		// Yen and Won typically don't use decimal places
+		return fmt.Sprintf("%s%.0f", symbol, amount)
+	case "SEK", "NOK", "DKK":
+		// Scandinavian currencies often put symbol after
+		return fmt.Sprintf("%.2f %s", amount, symbol)
+	case "PLN":
+		return fmt.Sprintf("%.2f %s", amount, symbol)
+	case "CZK":
+		return fmt.Sprintf("%.2f %s", amount, symbol)
+	case "HUF":
+		return fmt.Sprintf("%.0f %s", amount, symbol)
+	case "RUB":
+		return fmt.Sprintf("%.2f %s", amount, symbol)
+	case "INR":
+		return fmt.Sprintf("%s%.2f", symbol, amount)
+	case "CNY":
+		return fmt.Sprintf("%s%.2f", symbol, amount)
+	case "ZAR":
+		return fmt.Sprintf("%s%.2f", symbol, amount)
+	case "TRY":
+		return fmt.Sprintf("%.2f %s", amount, symbol)
+	case "ILS":
+		return fmt.Sprintf("%s%.2f", symbol, amount)
+	default:
+		return fmt.Sprintf("%s%.2f", symbol, amount)
+	}
+}
+
+// FormatPricePerLiter formats a price per liter with the appropriate currency symbol
+func FormatPricePerLiter(amount float64, currencyCode string) string {
+	symbol := GetCurrencySymbol(currencyCode)
+
+	// Handle currencies with different formatting conventions
+	switch strings.ToUpper(currencyCode) {
+	case "EUR", "GBP", "CHF":
+		return fmt.Sprintf("%s%.3f", symbol, amount)
+	case "USD", "CAD", "AUD", "HKD", "SGD", "NZD", "BRL", "MXN":
+		return fmt.Sprintf("%s%.3f", symbol, amount)
+	case "JPY", "KRW":
+		// Yen and Won typically don't use decimal places
+		return fmt.Sprintf("%s%.0f", symbol, amount)
+	case "SEK", "NOK", "DKK":
+		return fmt.Sprintf("%.3f %s", amount, symbol)
+	case "PLN":
+		return fmt.Sprintf("%.3f %s", amount, symbol)
+	case "CZK":
+		return fmt.Sprintf("%.2f %s", amount, symbol)
+	case "HUF":
+		return fmt.Sprintf("%.0f %s", amount, symbol)
+	case "RUB":
+		return fmt.Sprintf("%.2f %s", amount, symbol)
+	case "INR":
+		return fmt.Sprintf("%s%.3f", symbol, amount)
+	case "CNY":
+		return fmt.Sprintf("%s%.3f", symbol, amount)
+	case "ZAR":
+		return fmt.Sprintf("%s%.3f", symbol, amount)
+	case "TRY":
+		return fmt.Sprintf("%.3f %s", amount, symbol)
+	case "ILS":
+		return fmt.Sprintf("%s%.3f", symbol, amount)
+	default:
+		return fmt.Sprintf("%s%.3f", symbol, amount)
+	}
+}
+
+// IsValidCurrency checks if a currency code is supported
+func IsValidCurrency(code string) bool {
+	_, exists := GetCurrency(code)
+	return exists
+}
+
+// GetDefaultCurrency returns the default currency
+func GetDefaultCurrency() Currency {
+	return Currency{Code: "EUR", Name: "Euro", Symbol: "€"}
+}