package sender

import (
	"bytes"
	"context"
	"crypto/ecdsa"
	"errors"
	"fmt"
	"math/big"
	"strings"
	"time"

	"github.com/holiman/uint256"
	"github.com/prometheus/client_golang/prometheus"
	"github.com/scroll-tech/go-ethereum/accounts/abi/bind"
	"github.com/scroll-tech/go-ethereum/common"
	"github.com/scroll-tech/go-ethereum/consensus/misc"
	gethTypes "github.com/scroll-tech/go-ethereum/core/types"
	"github.com/scroll-tech/go-ethereum/crypto/kzg4844"
	"github.com/scroll-tech/go-ethereum/ethclient"
	"github.com/scroll-tech/go-ethereum/ethclient/gethclient"
	"github.com/scroll-tech/go-ethereum/log"
	"github.com/scroll-tech/go-ethereum/rlp"
	"github.com/scroll-tech/go-ethereum/rpc"
	"gorm.io/gorm"

	"scroll-tech/common/types"

	"scroll-tech/rollup/internal/config"
	"scroll-tech/rollup/internal/orm"
	"scroll-tech/rollup/internal/utils"
)

const (
	// LegacyTxType type for LegacyTx
	LegacyTxType = "LegacyTx"

	// DynamicFeeTxType type for DynamicFeeTx
	DynamicFeeTxType = "DynamicFeeTx"
)

// Confirmation struct used to indicate transaction confirmation details
type Confirmation struct {
	ContextID    string
	IsSuccessful bool
	TxHash       common.Hash
	SenderType   types.SenderType
}

// FeeData fee struct used to estimate gas price
type FeeData struct {
	gasFeeCap *big.Int
	gasTipCap *big.Int
	gasPrice  *big.Int

	blobGasFeeCap *big.Int

	accessList gethTypes.AccessList

	gasLimit uint64
}

// Sender Transaction sender to send transaction to l1/l2 geth
type Sender struct {
	config     *config.SenderConfig
	gethClient *gethclient.Client
	client     *ethclient.Client // The client to retrieve on chain data or send transaction.
	chainID    *big.Int          // The chain id of the endpoint
	ctx        context.Context
	service    string
	name       string
	senderType types.SenderType

	auth *bind.TransactOpts

	db                    *gorm.DB
	pendingTransactionOrm *orm.PendingTransaction

	confirmCh chan *Confirmation
	stopCh    chan struct{}

	metrics *senderMetrics
}

// NewSender returns a new instance of transaction sender
func NewSender(ctx context.Context, config *config.SenderConfig, priv *ecdsa.PrivateKey, service, name string, senderType types.SenderType, db *gorm.DB, reg prometheus.Registerer) (*Sender, error) {
	if config.EscalateMultipleNum <= config.EscalateMultipleDen {
		return nil, fmt.Errorf("invalid params, EscalateMultipleNum; %v, EscalateMultipleDen: %v", config.EscalateMultipleNum, config.EscalateMultipleDen)
	}

	rpcClient, err := rpc.Dial(config.Endpoint)
	if err != nil {
		return nil, fmt.Errorf("failed to dial eth client, err: %w", err)
	}

	client := ethclient.NewClient(rpcClient)
	chainID, err := client.ChainID(ctx)
	if err != nil {
		return nil, fmt.Errorf("failed to get chain ID, err: %w", err)
	}

	auth, err := bind.NewKeyedTransactorWithChainID(priv, chainID)
	if err != nil {
		return nil, fmt.Errorf("failed to create transactor with chain ID %v, err: %w", chainID, err)
	}

	// Set pending nonce
	nonce, err := client.PendingNonceAt(ctx, auth.From)
	if err != nil {
		return nil, fmt.Errorf("failed to get pending nonce for address %s, err: %w", auth.From.Hex(), err)
	}
	auth.Nonce = big.NewInt(int64(nonce))

	sender := &Sender{
		ctx:                   ctx,
		config:                config,
		gethClient:            gethclient.New(rpcClient),
		client:                client,
		chainID:               chainID,
		auth:                  auth,
		db:                    db,
		pendingTransactionOrm: orm.NewPendingTransaction(db),
		confirmCh:             make(chan *Confirmation, 128),
		stopCh:                make(chan struct{}),
		name:                  name,
		service:               service,
		senderType:            senderType,
	}
	sender.metrics = initSenderMetrics(reg)

	go sender.loop(ctx)

	return sender, nil
}

// GetChainID returns the chain ID associated with the sender.
func (s *Sender) GetChainID() *big.Int {
	return s.chainID
}

// Stop stop the sender module.
func (s *Sender) Stop() {
	close(s.stopCh)
	log.Info("sender stopped", "name", s.name, "service", s.service, "address", s.auth.From.String())
}

// ConfirmChan channel used to communicate with transaction sender
func (s *Sender) ConfirmChan() <-chan *Confirmation {
	return s.confirmCh
}

// SendConfirmation sends a confirmation to the confirmation channel.
// Note: This function is only used in tests.
func (s *Sender) SendConfirmation(cfm *Confirmation) {
	s.confirmCh <- cfm
}

func (s *Sender) getFeeData(target *common.Address, data []byte, sidecar *gethTypes.BlobTxSidecar, baseFee, blobBaseFee uint64, fallbackGasLimit uint64) (*FeeData, error) {
	switch s.config.TxType {
	case LegacyTxType:
		return s.estimateLegacyGas(target, data, fallbackGasLimit)
	case DynamicFeeTxType:
		if sidecar == nil {
			return s.estimateDynamicGas(target, data, baseFee, fallbackGasLimit)
		}
		return s.estimateBlobGas(target, data, sidecar, baseFee, blobBaseFee, fallbackGasLimit)
	default:
		return nil, fmt.Errorf("unsupported transaction type: %s", s.config.TxType)
	}
}

// SendTransaction send a signed L2tL1 transaction.
func (s *Sender) SendTransaction(contextID string, target *common.Address, data []byte, blob *kzg4844.Blob, fallbackGasLimit uint64) (common.Hash, error) {
	s.metrics.sendTransactionTotal.WithLabelValues(s.service, s.name).Inc()
	var (
		feeData *FeeData
		tx      *gethTypes.Transaction
		sidecar *gethTypes.BlobTxSidecar
		err     error
	)

	if blob != nil {
		sidecar, err = makeSidecar(blob)
		if err != nil {
			log.Error("failed to make sidecar for blob transaction", "error", err)
			return common.Hash{}, fmt.Errorf("failed to make sidecar for blob transaction, err: %w", err)
		}
	}

	blockNumber, baseFee, blobBaseFee, err := s.getBlockNumberAndBaseFeeAndBlobFee(s.ctx)
	if err != nil {
		log.Error("failed to get block number and base fee", "error", err)
		return common.Hash{}, fmt.Errorf("failed to get block number and base fee, err: %w", err)
	}

	if feeData, err = s.getFeeData(target, data, sidecar, baseFee, blobBaseFee, fallbackGasLimit); err != nil {
		s.metrics.sendTransactionFailureGetFee.WithLabelValues(s.service, s.name).Inc()
		log.Error("failed to get fee data", "from", s.auth.From.String(), "nonce", s.auth.Nonce.Uint64(), "fallback gas limit", fallbackGasLimit, "err", err)
		return common.Hash{}, fmt.Errorf("failed to get fee data, err: %w", err)
	}

	if tx, err = s.createAndSendTx(feeData, target, data, sidecar, nil); err != nil {
		s.metrics.sendTransactionFailureSendTx.WithLabelValues(s.service, s.name).Inc()
		log.Error("failed to create and send tx (non-resubmit case)", "from", s.auth.From.String(), "nonce", s.auth.Nonce.Uint64(), "err", err)
		return common.Hash{}, fmt.Errorf("failed to create and send transaction, err: %w", err)
	}

	if err = s.pendingTransactionOrm.InsertPendingTransaction(s.ctx, contextID, s.getSenderMeta(), tx, blockNumber); err != nil {
		log.Error("failed to insert transaction", "from", s.auth.From.String(), "nonce", s.auth.Nonce.Uint64(), "err", err)
		return common.Hash{}, fmt.Errorf("failed to insert transaction, err: %w", err)
	}
	return tx.Hash(), nil
}

func (s *Sender) createAndSendTx(feeData *FeeData, target *common.Address, data []byte, sidecar *gethTypes.BlobTxSidecar, overrideNonce *uint64) (*gethTypes.Transaction, error) {
	var (
		nonce  = s.auth.Nonce.Uint64()
		txData gethTypes.TxData
	)

	// this is a resubmit call, override the nonce
	if overrideNonce != nil {
		nonce = *overrideNonce
	}

	switch s.config.TxType {
	case LegacyTxType:
		txData = &gethTypes.LegacyTx{
			Nonce:    nonce,
			GasPrice: feeData.gasPrice,
			Gas:      feeData.gasLimit,
			To:       target,
			Data:     data,
		}
	case DynamicFeeTxType:
		if sidecar == nil {
			txData = &gethTypes.DynamicFeeTx{
				Nonce:      nonce,
				To:         target,
				Data:       data,
				Gas:        feeData.gasLimit,
				AccessList: feeData.accessList,
				ChainID:    s.chainID,
				GasTipCap:  feeData.gasTipCap,
				GasFeeCap:  feeData.gasFeeCap,
			}
		} else {
			if target == nil {
				log.Error("blob transaction to address cannot be nil", "address", s.auth.From.String(), "chainID", s.chainID.Uint64(), "nonce", s.auth.Nonce.Uint64())
				return nil, errors.New("blob transaction to address cannot be nil")
			}

			txData = &gethTypes.BlobTx{
				ChainID:    uint256.MustFromBig(s.chainID),
				Nonce:      nonce,
				GasTipCap:  uint256.MustFromBig(feeData.gasTipCap),
				GasFeeCap:  uint256.MustFromBig(feeData.gasFeeCap),
				Gas:        feeData.gasLimit,
				To:         *target,
				Data:       data,
				AccessList: feeData.accessList,
				BlobFeeCap: uint256.MustFromBig(feeData.blobGasFeeCap),
				BlobHashes: sidecar.BlobHashes(),
				Sidecar:    sidecar,
			}
		}
	}

	// sign and send
	signedTx, err := s.auth.Signer(s.auth.From, gethTypes.NewTx(txData))
	if err != nil {
		log.Error("failed to sign tx", "address", s.auth.From.String(), "err", err)
		return nil, err
	}

	if err = s.client.SendTransaction(s.ctx, signedTx); err != nil {
		log.Error("failed to send tx", "tx hash", signedTx.Hash().String(), "from", s.auth.From.String(), "nonce", signedTx.Nonce(), "err", err)
		// Check if contain nonce, and reset nonce
		// only reset nonce when it is not from resubmit
		if strings.Contains(err.Error(), "nonce") && overrideNonce == nil {
			s.resetNonce(context.Background())
		}
		return nil, err
	}

	if feeData.gasTipCap != nil {
		s.metrics.currentGasTipCap.WithLabelValues(s.service, s.name).Set(float64(feeData.gasTipCap.Uint64()))
	}

	if feeData.gasFeeCap != nil {
		s.metrics.currentGasFeeCap.WithLabelValues(s.service, s.name).Set(float64(feeData.gasFeeCap.Uint64()))
	}

	if feeData.gasPrice != nil {
		s.metrics.currentGasPrice.WithLabelValues(s.service, s.name).Set(float64(feeData.gasPrice.Uint64()))
	}

	if feeData.blobGasFeeCap != nil {
		s.metrics.currentBlobGasFeeCap.WithLabelValues(s.service, s.name).Set(float64(feeData.blobGasFeeCap.Uint64()))
	}

	s.metrics.currentGasLimit.WithLabelValues(s.service, s.name).Set(float64(feeData.gasLimit))

	// update nonce when it is not from resubmit
	if overrideNonce == nil {
		s.auth.Nonce = big.NewInt(int64(nonce + 1))
	}
	return signedTx, nil
}

// resetNonce reset nonce if send signed tx failed.
func (s *Sender) resetNonce(ctx context.Context) {
	nonce, err := s.client.PendingNonceAt(ctx, s.auth.From)
	if err != nil {
		log.Warn("failed to reset nonce", "address", s.auth.From.String(), "err", err)
		return
	}
	s.auth.Nonce = big.NewInt(int64(nonce))
}

func (s *Sender) resubmitTransaction(tx *gethTypes.Transaction, baseFee, blobBaseFee uint64) (*gethTypes.Transaction, error) {
	escalateMultipleNum := new(big.Int).SetUint64(s.config.EscalateMultipleNum)
	escalateMultipleDen := new(big.Int).SetUint64(s.config.EscalateMultipleDen)
	maxGasPrice := new(big.Int).SetUint64(s.config.MaxGasPrice)
	maxBlobGasPrice := new(big.Int).SetUint64(s.config.MaxBlobGasPrice)

	txInfo := map[string]interface{}{
		"tx_hash": tx.Hash().String(),
		"tx_type": s.config.TxType,
		"from":    s.auth.From.String(),
		"nonce":   tx.Nonce(),
	}

	var feeData FeeData
	feeData.gasLimit = tx.Gas()
	switch s.config.TxType {
	case LegacyTxType:
		originalGasPrice := tx.GasPrice()
		gasPrice := new(big.Int).Mul(originalGasPrice, escalateMultipleNum)
		gasPrice = new(big.Int).Div(gasPrice, escalateMultipleDen)
		if gasPrice.Cmp(maxGasPrice) > 0 {
			gasPrice = maxGasPrice
		}

		if originalGasPrice.Cmp(gasPrice) == 0 {
			log.Warn("gas price bump corner case, add 1 wei", "original", originalGasPrice.Uint64(), "adjusted", gasPrice.Uint64())
			gasPrice = new(big.Int).Add(gasPrice, big.NewInt(1))
		}

		feeData.gasPrice = gasPrice
		txInfo["original_gas_price"] = originalGasPrice.Uint64()
		txInfo["adjusted_gas_price"] = gasPrice.Uint64()

	case DynamicFeeTxType:
		if tx.BlobTxSidecar() == nil {
			originalGasTipCap := tx.GasTipCap()
			originalGasFeeCap := tx.GasFeeCap()

			gasTipCap := new(big.Int).Mul(originalGasTipCap, escalateMultipleNum)
			gasTipCap = new(big.Int).Div(gasTipCap, escalateMultipleDen)
			gasFeeCap := new(big.Int).Mul(originalGasFeeCap, escalateMultipleNum)
			gasFeeCap = new(big.Int).Div(gasFeeCap, escalateMultipleDen)

			// adjust for rising basefee
			currentGasFeeCap := getGasFeeCap(new(big.Int).SetUint64(baseFee), gasTipCap)
			if gasFeeCap.Cmp(currentGasFeeCap) < 0 {
				gasFeeCap = currentGasFeeCap
			}

			// but don't exceed maxGasPrice
			if gasFeeCap.Cmp(maxGasPrice) > 0 {
				gasFeeCap = maxGasPrice
			}

			// gasTipCap <= gasFeeCap
			if gasTipCap.Cmp(gasFeeCap) > 0 {
				gasTipCap = gasFeeCap
			}

			if originalGasTipCap.Cmp(gasTipCap) == 0 {
				log.Warn("gas tip cap bump corner case, add 1 wei", "original", originalGasTipCap.Uint64(), "adjusted", gasTipCap.Uint64())
				gasTipCap = new(big.Int).Add(gasTipCap, big.NewInt(1))
			}

			if originalGasFeeCap.Cmp(gasFeeCap) == 0 {
				log.Warn("gas fee cap bump corner case, add 1 wei", "original", originalGasFeeCap.Uint64(), "adjusted", gasFeeCap.Uint64())
				gasFeeCap = new(big.Int).Add(gasFeeCap, big.NewInt(1))
			}

			feeData.gasFeeCap = gasFeeCap
			feeData.gasTipCap = gasTipCap
			txInfo["original_gas_tip_cap"] = originalGasTipCap.Uint64()
			txInfo["adjusted_gas_tip_cap"] = gasTipCap.Uint64()
			txInfo["original_gas_fee_cap"] = originalGasFeeCap.Uint64()
			txInfo["adjusted_gas_fee_cap"] = gasFeeCap.Uint64()
		} else {
			originalGasTipCap := tx.GasTipCap()
			originalGasFeeCap := tx.GasFeeCap()
			originalBlobGasFeeCap := tx.BlobGasFeeCap()

			// bumping at least 100%
			gasTipCap := new(big.Int).Mul(originalGasTipCap, big.NewInt(2))
			gasFeeCap := new(big.Int).Mul(originalGasFeeCap, big.NewInt(2))
			blobGasFeeCap := new(big.Int).Mul(originalBlobGasFeeCap, big.NewInt(2))

			// adjust for rising basefee
			currentGasFeeCap := getGasFeeCap(new(big.Int).SetUint64(baseFee), gasTipCap)
			if gasFeeCap.Cmp(currentGasFeeCap) < 0 {
				gasFeeCap = currentGasFeeCap
			}

			// but don't exceed maxGasPrice
			if gasFeeCap.Cmp(maxGasPrice) > 0 {
				gasFeeCap = maxGasPrice
			}

			// gasTipCap <= gasFeeCap
			if gasTipCap.Cmp(gasFeeCap) > 0 {
				gasTipCap = gasFeeCap
			}

			// adjust for rising blobbasefee
			currentBlobGasFeeCap := getBlobGasFeeCap(new(big.Int).SetUint64(blobBaseFee))
			if blobGasFeeCap.Cmp(currentBlobGasFeeCap) < 0 {
				blobGasFeeCap = currentBlobGasFeeCap
			}

			// but don't exceed maxBlobGasPrice
			if blobGasFeeCap.Cmp(maxBlobGasPrice) > 0 {
				blobGasFeeCap = maxBlobGasPrice
			}

			feeData.gasFeeCap = gasFeeCap
			feeData.gasTipCap = gasTipCap
			feeData.blobGasFeeCap = blobGasFeeCap
			txInfo["original_gas_tip_cap"] = originalGasTipCap.Uint64()
			txInfo["adjusted_gas_tip_cap"] = gasTipCap.Uint64()
			txInfo["original_gas_fee_cap"] = originalGasFeeCap.Uint64()
			txInfo["adjusted_gas_fee_cap"] = gasFeeCap.Uint64()
			txInfo["original_blob_gas_fee_cap"] = originalBlobGasFeeCap.Uint64()
			txInfo["adjusted_blob_gas_fee_cap"] = blobGasFeeCap.Uint64()
		}

	default:
		return nil, fmt.Errorf("unsupported transaction type: %s", s.config.TxType)
	}

	log.Info("Transaction gas adjustment details", "service", s.service, "name", s.name, "txInfo", txInfo)

	nonce := tx.Nonce()
	s.metrics.resubmitTransactionTotal.WithLabelValues(s.service, s.name).Inc()
	tx, err := s.createAndSendTx(&feeData, tx.To(), tx.Data(), tx.BlobTxSidecar(), &nonce)
	if err != nil {
		log.Error("failed to create and send tx (resubmit case)", "from", s.auth.From.String(), "nonce", nonce, "err", err)
		return nil, err
	}
	return tx, nil
}

// checkPendingTransaction checks the confirmation status of pending transactions against the latest confirmed block number.
// If a transaction hasn't been confirmed after a certain number of blocks, it will be resubmitted with an increased gas price.
func (s *Sender) checkPendingTransaction() {
	s.metrics.senderCheckPendingTransactionTotal.WithLabelValues(s.service, s.name).Inc()

	blockNumber, baseFee, blobBaseFee, err := s.getBlockNumberAndBaseFeeAndBlobFee(s.ctx)
	if err != nil {
		log.Error("failed to get block number and base fee", "error", err)
		return
	}

	transactionsToCheck, err := s.pendingTransactionOrm.GetPendingOrReplacedTransactionsBySenderType(s.ctx, s.senderType, 100)
	if err != nil {
		log.Error("failed to load pending transactions", "sender meta", s.getSenderMeta(), "err", err)
		return
	}

	confirmed, err := utils.GetLatestConfirmedBlockNumber(s.ctx, s.client, s.config.Confirmations)
	if err != nil {
		log.Error("failed to get latest confirmed block number", "confirmations", s.config.Confirmations, "err", err)
		return
	}

	for _, txnToCheck := range transactionsToCheck {
		tx := new(gethTypes.Transaction)
		if err := tx.DecodeRLP(rlp.NewStream(bytes.NewReader(txnToCheck.RLPEncoding), 0)); err != nil {
			log.Error("failed to decode RLP", "context ID", txnToCheck.ContextID, "sender meta", s.getSenderMeta(), "err", err)
			continue
		}

		receipt, err := s.client.TransactionReceipt(s.ctx, tx.Hash())
		if err == nil { // tx confirmed.
			if receipt.BlockNumber.Uint64() <= confirmed {
				err := s.db.Transaction(func(dbTX *gorm.DB) error {
					// Update the status of the transaction to TxStatusConfirmed.
					if err := s.pendingTransactionOrm.UpdatePendingTransactionStatusByTxHash(s.ctx, tx.Hash(), types.TxStatusConfirmed, dbTX); err != nil {
						log.Error("failed to update transaction status by tx hash", "hash", tx.Hash().String(), "sender meta", s.getSenderMeta(), "from", s.auth.From.String(), "nonce", tx.Nonce(), "err", err)
						return err
					}
					// Update other transactions with the same nonce and sender address as failed.
					if err := s.pendingTransactionOrm.UpdateOtherTransactionsAsFailedByNonce(s.ctx, txnToCheck.SenderAddress, tx.Nonce(), tx.Hash(), dbTX); err != nil {
						log.Error("failed to update other transactions as failed by nonce", "senderAddress", txnToCheck.SenderAddress, "nonce", tx.Nonce(), "excludedTxHash", tx.Hash(), "err", err)
						return err
					}
					return nil
				})
				if err != nil {
					log.Error("db transaction failed after receiving confirmation", "err", err)
					return
				}

				// send confirm message
				s.confirmCh <- &Confirmation{
					ContextID:    txnToCheck.ContextID,
					IsSuccessful: receipt.Status == gethTypes.ReceiptStatusSuccessful,
					TxHash:       tx.Hash(),
					SenderType:   s.senderType,
				}
			}
		} else if txnToCheck.Status == types.TxStatusPending && // Only try resubmitting a new transaction based on gas price of the last transaction (status pending) with same ContextID.
			s.config.EscalateBlocks+txnToCheck.SubmitBlockNumber <= blockNumber {
			// It's possible that the pending transaction was marked as failed earlier in this loop (e.g., if one of its replacements has already been confirmed).
			// Therefore, we fetch the current transaction status again for accuracy before proceeding.
			status, err := s.pendingTransactionOrm.GetTxStatusByTxHash(s.ctx, tx.Hash())
			if err != nil {
				log.Error("failed to get transaction status by tx hash", "hash", tx.Hash().String(), "err", err)
				return
			}
			if status == types.TxStatusConfirmedFailed {
				log.Warn("transaction already marked as failed, skipping resubmission", "hash", tx.Hash().String())
				continue
			}

			log.Info("resubmit transaction",
				"service", s.service,
				"name", s.name,
				"hash", tx.Hash().String(),
				"from", s.auth.From.String(),
				"nonce", tx.Nonce(),
				"submitBlockNumber", txnToCheck.SubmitBlockNumber,
				"currentBlockNumber", blockNumber,
				"escalateBlocks", s.config.EscalateBlocks)

			if newTx, err := s.resubmitTransaction(tx, baseFee, blobBaseFee); err != nil {
				s.metrics.resubmitTransactionFailedTotal.WithLabelValues(s.service, s.name).Inc()
				log.Error("failed to resubmit transaction", "context ID", txnToCheck.ContextID, "sender meta", s.getSenderMeta(), "from", s.auth.From.String(), "nonce", tx.Nonce(), "err", err)
			} else {
				err := s.db.Transaction(func(dbTX *gorm.DB) error {
					// Update the status of the original transaction as replaced, while still checking its confirmation status.
					if err := s.pendingTransactionOrm.UpdatePendingTransactionStatusByTxHash(s.ctx, tx.Hash(), types.TxStatusReplaced, dbTX); err != nil {
						return fmt.Errorf("failed to update status of transaction with hash %s to TxStatusReplaced, err: %w", tx.Hash().String(), err)
					}
					// Record the new transaction that has replaced the original one.
					if err := s.pendingTransactionOrm.InsertPendingTransaction(s.ctx, txnToCheck.ContextID, s.getSenderMeta(), newTx, blockNumber, dbTX); err != nil {
						return fmt.Errorf("failed to insert new pending transaction with context ID: %s, nonce: %d, hash: %v, previous block number: %v, current block number: %v, err: %w", txnToCheck.ContextID, newTx.Nonce(), newTx.Hash().String(), txnToCheck.SubmitBlockNumber, blockNumber, err)
					}
					return nil
				})
				if err != nil {
					log.Error("db transaction failed after resubmitting", "err", err)
					return
				}
			}
		}
	}
}

// Loop is the main event loop
func (s *Sender) loop(ctx context.Context) {
	checkTick := time.NewTicker(time.Duration(s.config.CheckPendingTime) * time.Second)
	defer checkTick.Stop()

	for {
		select {
		case <-checkTick.C:
			s.checkPendingTransaction()
		case <-ctx.Done():
			return
		case <-s.stopCh:
			return
		}
	}
}

func (s *Sender) getSenderMeta() *orm.SenderMeta {
	return &orm.SenderMeta{
		Name:    s.name,
		Service: s.service,
		Address: s.auth.From,
		Type:    s.senderType,
	}
}

func (s *Sender) getBlockNumberAndBaseFeeAndBlobFee(ctx context.Context) (uint64, uint64, uint64, error) {
	header, err := s.client.HeaderByNumber(ctx, nil)
	if err != nil {
		return 0, 0, 0, fmt.Errorf("failed to get header by number, err: %w", err)
	}

	var baseFee uint64
	if header.BaseFee != nil {
		baseFee = header.BaseFee.Uint64()
	}

	var blobBaseFee uint64
	if header.ExcessBlobGas != nil && header.BlobGasUsed != nil {
		parentExcessBlobGas := misc.CalcExcessBlobGas(*header.ExcessBlobGas, *header.BlobGasUsed)
		blobBaseFee = misc.CalcBlobFee(parentExcessBlobGas).Uint64()
	}
	return header.Number.Uint64(), baseFee, blobBaseFee, nil
}

func makeSidecar(blob *kzg4844.Blob) (*gethTypes.BlobTxSidecar, error) {
	if blob == nil {
		return nil, errors.New("blob cannot be nil")
	}

	blobs := []kzg4844.Blob{*blob}
	var commitments []kzg4844.Commitment
	var proofs []kzg4844.Proof

	for _, b := range blobs {
		c, err := kzg4844.BlobToCommitment(b)
		if err != nil {
			return nil, fmt.Errorf("failed to get blob commitment, err: %w", err)
		}

		p, err := kzg4844.ComputeBlobProof(b, c)
		if err != nil {
			return nil, fmt.Errorf("failed to compute blob proof, err: %w", err)
		}

		commitments = append(commitments, c)
		proofs = append(proofs, p)
	}

	return &gethTypes.BlobTxSidecar{
		Blobs:       blobs,
		Commitments: commitments,
		Proofs:      proofs,
	}, nil
}