// Copyright 2024 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package gobtools

import (
	"bytes"
	"encoding/gob"
)

type CustomGob[T any] interface {
	ToGob() *T
	FromGob(data *T)
}

func CustomGobEncode[T any](cg CustomGob[T]) ([]byte, error) {
	w := new(bytes.Buffer)
	encoder := gob.NewEncoder(w)
	err := encoder.Encode(cg.ToGob())
	if err != nil {
		return nil, err
	}

	return w.Bytes(), nil
}

func CustomGobDecode[T any](data []byte, cg CustomGob[T]) error {
	r := bytes.NewBuffer(data)
	var value T
	decoder := gob.NewDecoder(r)
	err := decoder.Decode(&value)
	if err != nil {
		return err
	}
	cg.FromGob(&value)

	return nil
}