package sbhpfv1

import (
	"encoding/binary"
	"errors"
	"io"
)

// getWriterPosition returns the current write position.
func getWriterPosition(w io.Writer) int64 {
	if seeker, ok := w.(io.Seeker); ok {
		pos, _ := seeker.Seek(0, io.SeekCurrent)
		return pos
	}
	return -1
}

// writeUint32AtPosition writes an uint32 at a given position.
func writeUint32AtPosition(w io.Writer, pos int64, value uint32) error {
	if seeker, ok := w.(io.Seeker); ok {
		curPos, _ := seeker.Seek(0, io.SeekCurrent) // Save current position
		if _, err := seeker.Seek(pos, io.SeekStart); err != nil {
			return err
		}
		if err := binary.Write(w, binary.LittleEndian, value); err != nil {
			return err
		}
		_, _ = seeker.Seek(curPos, io.SeekStart) // Restore position
		return nil
	}
	return errors.New("writer does not support seeking")
}