package tree

import (
	frostfsecdsa "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/crypto/ecdsa"
	tree "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree/service"
)

type message interface {
	SignedDataSize() int
	ReadSignedData([]byte) ([]byte, error)
	GetSignature() *tree.Signature
	SetSignature(*tree.Signature)
}

// signMessage uses the pool key and signs any protobuf
// message that was generated for the TreeService by the
// protoc-gen-go-frostfs generator. Returns any errors directly.
func (p *Pool) signRequest(m message) error {
	binBody, err := m.ReadSignedData(nil)
	if err != nil {
		return err
	}

	keySDK := frostfsecdsa.Signer(p.key.PrivateKey)
	data, err := keySDK.Sign(binBody)
	if err != nil {
		return err
	}

	rawPub := make([]byte, keySDK.Public().MaxEncodedSize())
	rawPub = rawPub[:keySDK.Public().Encode(rawPub)]
	m.SetSignature(&tree.Signature{
		Key:  rawPub,
		Sign: data,
	})

	return nil
}