package domain

import (
	"errors"
	"fmt"
	"time"
)

type Currency int64

// ToCurrency converts a float32 to Currency
func ToCurrency(f float32) Currency {
	return Currency((f * 100) + 0.5)
}

// Float32 converts a Currency to float32
func (m Currency) Float32() float32 {
	x := float32(m)
	x = x / 100
	return x
}

// String returns a formatted Currency value
func (m Currency) String() string {
	x := float32(m)
	x = x / 100
	return fmt.Sprintf("$%.2f", x)
}

type IntCurrency string

const (
	ETB IntCurrency = "ETB" // Ethiopian Birr
	NGN IntCurrency = "NGN" // Nigerian Naira
	ZAR IntCurrency = "ZAR" // South African Rand
	EGP IntCurrency = "EGP" // Egyptian Pound
	KES IntCurrency = "KES" // Kenyan Shilling
	UGX IntCurrency = "UGX" // Ugandan Shilling
	TZS IntCurrency = "TZS" // Tanzanian Shilling
	RWF IntCurrency = "RWF" // Rwandan Franc
	BIF IntCurrency = "BIF" // Burundian Franc
	XOF IntCurrency = "XOF" // West African CFA Franc (BCEAO)
	XAF IntCurrency = "XAF" // Central African CFA Franc (BEAC)
	GHS IntCurrency = "GHS" // Ghanaian Cedi
	SDG IntCurrency = "SDG" // Sudanese Pound
	SSP IntCurrency = "SSP" // South Sudanese Pound
	DZD IntCurrency = "DZD" // Algerian Dinar
	MAD IntCurrency = "MAD" // Moroccan Dirham
	TND IntCurrency = "TND" // Tunisian Dinar
	LYD IntCurrency = "LYD" // Libyan Dinar
	MZN IntCurrency = "MZN" // Mozambican Metical
	AOA IntCurrency = "AOA" // Angolan Kwanza
	BWP IntCurrency = "BWP" // Botswana Pula
	ZMW IntCurrency = "ZMW" // Zambian Kwacha
	MWK IntCurrency = "MWK" // Malawian Kwacha
	LSL IntCurrency = "LSL" // Lesotho Loti
	NAD IntCurrency = "NAD" // Namibian Dollar
	SZL IntCurrency = "SZL" // Swazi Lilangeni
	CVE IntCurrency = "CVE" // Cape Verdean Escudo
	GMD IntCurrency = "GMD" // Gambian Dalasi
	SLL IntCurrency = "SLL" // Sierra Leonean Leone
	LRD IntCurrency = "LRD" // Liberian Dollar
	GNF IntCurrency = "GNF" // Guinean Franc
	XCD IntCurrency = "XCD" // Eastern Caribbean Dollar (used in Saint Lucia)
	MRU IntCurrency = "MRU" // Mauritanian Ouguiya
	KMF IntCurrency = "KMF" // Comorian Franc
	DJF IntCurrency = "DJF" // Djiboutian Franc
	SOS IntCurrency = "SOS" // Somali Shilling
	ERN IntCurrency = "ERN" // Eritrean Nakfa
	MGA IntCurrency = "MGA" // Malagasy Ariary
	SCR IntCurrency = "SCR" // Seychellois Rupee
	MUR IntCurrency = "MUR" // Mauritian Rupee

	// International currencies (already listed)
	USD IntCurrency = "USD" // US Dollar
	EUR IntCurrency = "EUR" // Euro
	GBP IntCurrency = "GBP" // British Pound
)

var (
	ErrUnsupportedIntCurrency = errors.New("unsupported IntCurrency")
	ErrIntCurrencyConversion  = errors.New("IntCurrency conversion failed")
)

// IntCurrencyRate represents exchange rate between two currencies
type IntCurrencyRate struct {
	From       IntCurrency
	To         IntCurrency
	Rate       float64
	ValidUntil time.Time
}

// Convert converts amount from one IntCurrency to another
func (cr IntCurrencyRate) Convert(amount float64) (float64, error) {
	if time.Now().After(cr.ValidUntil) {
		return 0, fmt.Errorf("%w: rate expired", ErrIntCurrencyConversion)
	}
	return amount * cr.Rate, nil
}

// ValidateIntCurrency checks if IntCurrency is supported
func ValidateIntCurrency(c IntCurrency) error {
	switch c {
	case ETB, USD, EUR, GBP:
		return nil
	default:
		return fmt.Errorf("%w: %s", ErrUnsupportedIntCurrency, c)
	}
}