package stdoutpub

import (
	"fmt"
	"os"
)

const outPrefix = "Result: "

func NewService() Service {
	return Service{
		fd: os.Stdout,
	}
}

type Service struct {
	fd *os.File
}

func (s Service) Publish(i int64) error {
	if _, err := fmt.Fprintf(s.fd, "%s%d\n", outPrefix, i); err != nil {
		return fmt.Errorf("write to file: %w", err)
	}

	return nil
}