142 lines
4.3 KiB
Go
142 lines
4.3 KiB
Go
package domain
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import (
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"errors"
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"fmt"
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"math"
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"time"
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)
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type Currency int64
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// ToCurrency converts a float32 (like 12.34) into Currency (stored in cents).
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func ToCurrency(f float32) Currency {
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cents := math.Round(float64(f) * 100) // avoid float32 precision issues
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return Currency(int64(cents))
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}
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// Float32 converts a Currency back into float32 (like 12.34).
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func (m Currency) Float32() float32 {
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return float32(m) / 100
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}
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// String returns a formatted Currency value for display.
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func (m Currency) String() string {
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return fmt.Sprintf("$%.2f", m.Float32())
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}
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// TODO: Change the currency to this format when implementing multi-currency
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// type Currency struct {
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// Value int64
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// Type IntCurrency
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// }
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// // ToCurrency converts a float32 (like 12.34) into Currency (stored in cents).
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// func NewCurrency(f float32, currencyType IntCurrency) Currency {
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// cents := math.Round(float64(f) * 100) // avoid float32 precision issues
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// return Currency{
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// Value: int64(cents),
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// Type: currencyType,
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// }
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// }
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// func NewBase(v int64) Currency {
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// return Currency{
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// Value: v,
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// Type: BASE,
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// }
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// }
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// // Float32 converts a Currency back into float32 (like 12.34).
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// func (m Currency) Float32() float32 {
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// return float32(m.Value) / 100
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// }
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// // String returns a formatted Currency value for display.
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// func (m Currency) String() string {
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// return fmt.Sprintf("$%.2f", m.Float32())
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// }
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type IntCurrency string
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const (
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BASE IntCurrency = "BASE"
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ETB IntCurrency = "ETB" // Ethiopian Birr
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NGN IntCurrency = "NGN" // Nigerian Naira
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ZAR IntCurrency = "ZAR" // South African Rand
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EGP IntCurrency = "EGP" // Egyptian Pound
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KES IntCurrency = "KES" // Kenyan Shilling
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UGX IntCurrency = "UGX" // Ugandan Shilling
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TZS IntCurrency = "TZS" // Tanzanian Shilling
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RWF IntCurrency = "RWF" // Rwandan Franc
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BIF IntCurrency = "BIF" // Burundian Franc
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XOF IntCurrency = "XOF" // West African CFA Franc (BCEAO)
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XAF IntCurrency = "XAF" // Central African CFA Franc (BEAC)
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GHS IntCurrency = "GHS" // Ghanaian Cedi
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SDG IntCurrency = "SDG" // Sudanese Pound
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SSP IntCurrency = "SSP" // South Sudanese Pound
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DZD IntCurrency = "DZD" // Algerian Dinar
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MAD IntCurrency = "MAD" // Moroccan Dirham
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TND IntCurrency = "TND" // Tunisian Dinar
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LYD IntCurrency = "LYD" // Libyan Dinar
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MZN IntCurrency = "MZN" // Mozambican Metical
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AOA IntCurrency = "AOA" // Angolan Kwanza
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BWP IntCurrency = "BWP" // Botswana Pula
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ZMW IntCurrency = "ZMW" // Zambian Kwacha
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MWK IntCurrency = "MWK" // Malawian Kwacha
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LSL IntCurrency = "LSL" // Lesotho Loti
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NAD IntCurrency = "NAD" // Namibian Dollar
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SZL IntCurrency = "SZL" // Swazi Lilangeni
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CVE IntCurrency = "CVE" // Cape Verdean Escudo
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GMD IntCurrency = "GMD" // Gambian Dalasi
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SLL IntCurrency = "SLL" // Sierra Leonean Leone
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LRD IntCurrency = "LRD" // Liberian Dollar
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GNF IntCurrency = "GNF" // Guinean Franc
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XCD IntCurrency = "XCD" // Eastern Caribbean Dollar (used in Saint Lucia)
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MRU IntCurrency = "MRU" // Mauritanian Ouguiya
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KMF IntCurrency = "KMF" // Comorian Franc
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DJF IntCurrency = "DJF" // Djiboutian Franc
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SOS IntCurrency = "SOS" // Somali Shilling
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ERN IntCurrency = "ERN" // Eritrean Nakfa
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MGA IntCurrency = "MGA" // Malagasy Ariary
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SCR IntCurrency = "SCR" // Seychellois Rupee
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MUR IntCurrency = "MUR" // Mauritian Rupee
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// International currencies (already listed)
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USD IntCurrency = "USD" // US Dollar
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EUR IntCurrency = "EUR" // Euro
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GBP IntCurrency = "GBP" // British Pound
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)
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var (
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ErrUnsupportedIntCurrency = errors.New("unsupported IntCurrency")
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ErrIntCurrencyConversion = errors.New("IntCurrency conversion failed")
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)
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// IntCurrencyRate represents exchange rate between two currencies
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type IntCurrencyRate struct {
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From IntCurrency
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To IntCurrency
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Rate float64
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ValidUntil time.Time
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}
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// Convert converts amount from one IntCurrency to another
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func (cr IntCurrencyRate) Convert(amount float64) (float64, error) {
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if time.Now().After(cr.ValidUntil) {
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return 0, fmt.Errorf("%w: rate expired", ErrIntCurrencyConversion)
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}
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return amount * cr.Rate, nil
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}
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// ValidateIntCurrency checks if IntCurrency is supported
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func ValidateIntCurrency(c IntCurrency) error {
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switch c {
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case ETB, USD, EUR, GBP:
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return nil
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default:
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return fmt.Errorf("%w: %s", ErrUnsupportedIntCurrency, c)
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}
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}
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