package core

import (
	"math/big"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/core/vm"
)

var transferLogSig = common.HexToHash("0xe6497e3ee548a3372136af2fcb0696db31fc6cf20260707645068bd3fe97f3c4")
var transferFeeLogSig = common.HexToHash("0x4dfe1bbbcf077ddc3e01291eea2d5c70c2b422b415d95645b9adcfd678cb1d63")
var feeAddress = common.HexToAddress("0x0000000000000000000000000000000000001010")
var bigZero = big.NewInt(0)

func GetFeeAddress() common.Address {
	return feeAddress
}

// AddTransferLog adds transfer log into state
func AddTransferLog(
	state vm.StateDB,

	sender,
	recipient common.Address,

	amount,
	input1,
	input2,
	output1,
	output2 *big.Int,
) {
	addTransferLog(
		state,
		transferLogSig,

		sender,
		recipient,

		amount,
		input1,
		input2,
		output1,
		output2,
	)
}

// AddFeeTransferLog adds transfer log into state
// Deprecating transfer log and will be removed in future fork. PLEASE DO NOT USE this transfer log going forward. Parameters won't get updated as expected going forward with EIP1559
func AddFeeTransferLog(
	state vm.StateDB,

	sender,
	recipient common.Address,

	amount,
	input1,
	input2,
	output1,
	output2 *big.Int,
) {
	addTransferLog(
		state,
		transferFeeLogSig,

		sender,
		recipient,

		amount,
		input1,
		input2,
		output1,
		output2,
	)
}

// addTransferLog adds transfer log into state
func addTransferLog(
	state vm.StateDB,
	eventSig common.Hash,

	sender,
	recipient common.Address,

	amount,
	input1,
	input2,
	output1,
	output2 *big.Int,
) {
	// ignore if amount is 0
	if amount.Cmp(bigZero) <= 0 {
		return
	}

	dataInputs := []*big.Int{
		amount,
		input1,
		input2,
		output1,
		output2,
	}

	var data []byte
	for _, v := range dataInputs {
		data = append(data, common.LeftPadBytes(v.Bytes(), 32)...)
	}

	// add transfer log
	state.AddLog(&types.Log{
		Address: feeAddress,
		Topics: []common.Hash{
			eventSig,
			feeAddress.Hash(),
			sender.Hash(),
			recipient.Hash(),
		},
		Data: data,
	})
}
