// Copyright 2016 The go-ethereum Authors
// (original work)
// Copyright 2024 The Erigon Authors
// (modifications)
// This file is part of Erigon.
//
// Erigon is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Erigon is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Erigon. If not, see <http://www.gnu.org/licenses/>.

package bind

import (
	"crypto/ecdsa"
	"errors"

	"github.com/holiman/uint256"

	"github.com/erigontech/erigon/common"
	"github.com/erigontech/erigon/common/crypto"
	"github.com/erigontech/erigon/execution/types"
)

// ErrNoChainID is returned whenever the user failed to specify a chain id.
var ErrNoChainID = errors.New("no chain id specified")

// ErrNotAuthorized is returned when an account is not properly unlocked.
var ErrNotAuthorized = errors.New("not authorized to sign this account")

// NewKeyedTransactorWithChainID is a utility method to easily create a transaction signer
// from a single private key.
func NewKeyedTransactorWithChainID(key *ecdsa.PrivateKey, chainID *uint256.Int) (*TransactOpts, error) {
	keyAddr := crypto.PubkeyToAddress(key.PublicKey)
	if chainID == nil {
		return nil, ErrNoChainID
	}
	signer := types.LatestSignerForChainID(chainID)
	return &TransactOpts{
		From: keyAddr,
		Signer: func(address common.Address, txn types.Transaction) (types.Transaction, error) {
			if address != keyAddr {
				return nil, ErrNotAuthorized
			}
			sigHash := txn.SigningHash(chainID)
			signature, err := crypto.Sign(sigHash[:], key)
			if err != nil {
				return nil, err
			}
			return txn.WithSignature(*signer, signature)
		},
	}, nil
}
