package iorw

import (
	"encoding/binary"
	"io"
)

func WriteStr(w io.Writer, message string) error {
	messageBytes := []byte(message)
	sizeBytes := make([]byte, 8)
	binary.BigEndian.PutUint64(sizeBytes, uint64(len(messageBytes)))

	if _, err := w.Write(sizeBytes); err != nil {
		return err
	}
	if _, err := w.Write(messageBytes); err != nil {
		return err
	}

	return nil
}

func ReadStr(r io.Reader) (string, error) {
	sizeBytes := make([]byte, 8)
	if _, err := io.ReadFull(r, sizeBytes); err != nil {
		return "", err
	}
	messageSize := binary.BigEndian.Uint64(sizeBytes)

	messageBytes := make([]byte, messageSize)
	if _, err := io.ReadFull(r, messageBytes); err != nil {
		return "", err
	}

	return string(messageBytes), nil
}