// Copyright (C) 2019-2025, Lux Industries, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
//
// This file is a derived work, based on the go-ethereum library whose original
// notices appear below.
//
// It is distributed under a license compatible with the licensing terms of the
// original code from which it is derived.
//
// Much love to the original authors for their work.
// **********
// Copyright 2025 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library 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.
//
// The go-ethereum library 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 the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package simulated

import (
	"math/big"

	"github.com/luxfi/evm/eth/ethconfig"
	"github.com/luxfi/evm/node"
	"github.com/luxfi/evm/params"
)

// WithBlockGasLimit configures the simulated backend to target a specific gas limit
// when producing blocks.
func WithBlockGasLimit(gaslimit uint64) func(nodeConf *node.Config, ethConf *ethconfig.Config) {
	return func(nodeConf *node.Config, ethConf *ethconfig.Config) {
		ethConf.Genesis.GasLimit = gaslimit
		params.GetExtra(ethConf.Genesis.Config).FeeConfig.GasLimit = new(big.Int).SetUint64(gaslimit)
	}
}

// WithCallGasLimit configures the simulated backend to cap eth_calls to a specific
// gas limit when running client operations.
func WithCallGasLimit(gaslimit uint64) func(nodeConf *node.Config, ethConf *ethconfig.Config) {
	return func(nodeConf *node.Config, ethConf *ethconfig.Config) {
		ethConf.RPCGasCap = gaslimit
	}
}

// WithChainConfig configures the simulated backend to use a custom chain config.
// This is useful for testing with legacy bytecode that requires pre-Shanghai/Cancun EVM.
func WithChainConfig(config *params.ChainConfig) func(nodeConf *node.Config, ethConf *ethconfig.Config) {
	return func(nodeConf *node.Config, ethConf *ethconfig.Config) {
		ethConf.Genesis.Config = config
	}
}