package payment

import (
	"fmt"
	"net"
	"time"
)

// StartTransaction sends a start transaction XML to ChipDNA Server
func (pc *PaymentClient) StartTransaction(amountMinorUnits int, reference string) (string, error) {
	conn, err := net.Dial("tcp", pc.Addr)
	if err != nil {
		return "", fmt.Errorf("failed to connect: %w", err)
	}
	defer conn.Close()

	// Set timeout
	conn.SetDeadline(time.Now().Add(15 * time.Second))

	// Format XML request
	request := fmt.Sprintf(`
<StartTransaction>
	<Amount>%d</Amount>
	<AmountType>Actual</AmountType>
	<Reference>%s</Reference>
	<TransactionType>Sale</TransactionType>
</StartTransaction>`, amountMinorUnits, reference)

	_, err = conn.Write([]byte(request))
	if err != nil {
		return "", fmt.Errorf("failed to write to server: %w", err)
	}

	// Read response
	buff := make([]byte, 4096)
	n, err := conn.Read(buff)
	if err != nil {
		return "", fmt.Errorf("failed to read from server: %w", err)
	}

	return string(buff[:n]), nil
}