package types

import (
	"encoding/json"
	"fmt"
)

type SupportedCurrency string

func (s *SupportedCurrency) UnmarshalJSON(bytes []byte) error {
	var str string
	if err := json.Unmarshal(bytes, &str); err != nil {
		return err
	}
	switch str {
	case "WEI":
		*s = SupportedCurrencyWEI
	case "EUR":
		*s = SupportedCurrencyEUR
	case "USD":
		*s = SupportedCurrencyUSD
	case "GBP":
		*s = SupportedCurrencyGBP
	default:
		return fmt.Errorf("unsupported currency: %s", str)
	}
	return nil
}

func (s SupportedCurrency) MarshalJSON() ([]byte, error) {
	return json.Marshal(string(s))
}

const (
	SupportedCurrencyWEI SupportedCurrency = "WEI"
	SupportedCurrencyEUR SupportedCurrency = "EUR"
	SupportedCurrencyUSD SupportedCurrency = "USD"
	SupportedCurrencyGBP SupportedCurrency = "GBP"
)