ecr_message.go

package ingenico

import (
	"fmt"
	"math/rand"
)

const (
	SALE = "01"
)

type ECRMessage struct {
	TerminalID        IntFormat
	NextTransactionNo IntFormat
	CashierID         IntFormat
	CurrencyISO       IntFormat

	TransactionAmount     IntFormat
	TransactionAmountCash IntFormat

	TransactionType           string
	AuthorizationCode         string
	InputLabel                string
	InsurancePolicyNumber     string
	InstallmentsNumber        string
	LanguageID                string
	PrintData                 string
	PayservicesData           string
	TransactionActivationCode string
	InstantPaymentRef         string
	QRCodeData                string

	POSPrints bool
}

func NewSale(TransactionAmount IntFormat) ECRMessage {
	NextTransactionNo := rand.Intn(9999)
	fmt.Printf("NextTransactionNo: %d\n", NextTransactionNo)
	return ECRMessage{
		NextTransactionNo: IntFormat(NextTransactionNo),
		CurrencyISO:       946,
		POSPrints:         true,
		CashierID:         0,
		LanguageID:        "00",
		TransactionType:   SALE,
		TransactionAmount: TransactionAmount,
	}
}

func (msg ECRMessage) BuildMessage() []byte {
	message := []byte("00")
	message = append(message, msg.TerminalID.ToByte(2)...)
	message = append(message, []byte("00")...)
	message = append(message, msg.NextTransactionNo.ToByte(4)...)
	message = append(message, []byte(msg.TransactionType)...)
	if msg.POSPrints {
		message = append(message, []byte("1")...)
	} else {
		message = append(message, []byte("0")...)
	}
	message = append(message, msg.CashierID.ToByte(2)...)
	message = append(message, FS)
	if msg.TransactionAmount != 0 {
		message = append(message, msg.TransactionAmount.ToByte(1)...)
	}
	message = append(message, FS)
	message = append(message, FS)
	message = append(message, []byte("+0")...) // Amount Exponent
	message = append(message, FS)
	if msg.CurrencyISO > 0 {
		message = append(message, msg.CurrencyISO.ToByte(3)...)
	}
	message = append(message, FS)
	message = append(message, FS)
	message = append(message, FS)
	message = append(message, FS)
	message = append(message, []byte(msg.AuthorizationCode)...)
	message = append(message, FS)
	message = append(message, FS)
	message = append(message, FS)
	message = append(message, []byte(msg.InputLabel)...)
	message = append(message, FS)
	message = append(message, []byte(msg.InsurancePolicyNumber)...)
	message = append(message, FS)
	message = append(message, []byte(msg.InstallmentsNumber)...)
	message = append(message, FS)
	message = append(message, FS)
	message = append(message, []byte(msg.LanguageID)...)
	message = append(message, FS)
	message = append(message, []byte(msg.PrintData)...)
	message = append(message, FS)
	message = append(message, FS)
	if msg.TransactionAmountCash != 0 {
		message = append(message, msg.TransactionAmountCash.ToByte(1)...)
	}
	message = append(message, FS)
	message = append(message, []byte(msg.PayservicesData)...)
	message = append(message, FS)
	message = append(message, []byte(msg.TransactionActivationCode)...)
	message = append(message, FS)
	message = append(message, []byte(msg.InstantPaymentRef)...)
	message = append(message, FS)
	message = append(message, []byte(msg.QRCodeData)...)
	message = append(message, FS)

	return message
}