// Copyright 2021 Evmos Foundation
// This file is part of Evmos' Ethermint library.
//
// The Ethermint 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 Ethermint 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 Ethermint library. If not, see https://github.com/evmos/ethermint/blob/main/LICENSE
package statedb

import (
	"math/big"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/params"
	"github.com/evmos/ethermint/x/evm/types"
)

// TxConfig encapulates the readonly information of current tx for `StateDB`.
type TxConfig struct {
	BlockHash common.Hash // hash of current block
	TxHash    common.Hash // hash of current tx
	TxIndex   uint        // the index of current transaction
	LogIndex  uint        // the index of next log within current block
}

// NewTxConfig returns a TxConfig
func NewTxConfig(bhash, thash common.Hash, txIndex, logIndex uint) TxConfig {
	return TxConfig{
		BlockHash: bhash,
		TxHash:    thash,
		TxIndex:   txIndex,
		LogIndex:  logIndex,
	}
}

// NewEmptyTxConfig construct an empty TxConfig,
// used in context where there's no transaction, e.g. `eth_call`/`eth_estimateGas`.
func NewEmptyTxConfig(bhash common.Hash) TxConfig {
	return TxConfig{
		BlockHash: bhash,
		TxHash:    common.Hash{},
		TxIndex:   0,
		LogIndex:  0,
	}
}

// EVMConfig encapsulates common parameters needed to create an EVM to execute a message
// It's mainly to reduce the number of method parameters
type EVMConfig struct {
	Params      types.Params
	ChainConfig *params.ChainConfig
	CoinBase    common.Address
	BaseFee     *big.Int
}