package fs

import (
	"bytes"
	"encoding/gob"
	"io"

	"github.com/pkg/errors"
)

func DefaultMarshalValue[V any](value V) (io.Reader, error) {
	var buf bytes.Buffer
	encoder := gob.NewEncoder(&buf)

	if err := encoder.Encode(value); err != nil {
		return nil, errors.WithStack(err)
	}

	return &buf, nil
}

func DefaultUnmarshalValue[V any](d io.Reader) (V, error) {
	var value V
	encoder := gob.NewDecoder(d)

	if err := encoder.Decode(&value); err != nil {
		return *new(V), errors.WithStack(err)
	}

	return value, nil
}