package arbitrage

import (
	"bytes"
	"context"
	"encoding/hex"
	"errors"
	"fmt"
	stdmath "math"
	"math/big"
	"strings"
	"time"

	"github.com/ethereum/go-ethereum"
	"github.com/ethereum/go-ethereum/accounts/abi"
	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/ethclient"

	"github.com/fraktal/mev-beta/bindings/contracts"
	"github.com/fraktal/mev-beta/bindings/flashswap"
	"github.com/fraktal/mev-beta/internal/logger"
	"github.com/fraktal/mev-beta/pkg/arbitrum"
	"github.com/fraktal/mev-beta/pkg/math"
	"github.com/fraktal/mev-beta/pkg/security"
	pkgtypes "github.com/fraktal/mev-beta/pkg/types"
)

// FlashSwapExecutor executes arbitrage using flash swaps for capital efficiency
type FlashSwapExecutor struct {
	client           *ethclient.Client
	logger           *logger.Logger
	keyManager       *security.KeyManager
	gasEstimator     *arbitrum.L2GasEstimator
	decimalConverter *math.DecimalConverter

	// Contract addresses
	flashSwapContract common.Address
	arbitrageContract common.Address

	// Contract bindings
	flashSwapBinding *flashswap.BaseFlashSwapper
	arbitrageBinding arbitrageLogParser

	// Configuration
	config ExecutionConfig

	// State tracking
	pendingExecutions map[common.Hash]*ExecutionState
	executionHistory  []*ExecutionResult
	totalProfit       *math.UniversalDecimal
	totalGasCost      *math.UniversalDecimal

	// Token metadata helpers
	tokenRegistry     map[common.Address]tokenDescriptor
	ethReferenceToken common.Address
}

// ExecutionConfig configures the flash swap executor
type ExecutionConfig struct {
	// Risk management
	MaxSlippage        *math.UniversalDecimal
	MinProfitThreshold *math.UniversalDecimal
	MaxPositionSize    *math.UniversalDecimal
	MaxDailyVolume     *math.UniversalDecimal

	// Gas settings
	GasLimitMultiplier  float64
	MaxGasPrice         *math.UniversalDecimal
	PriorityFeeStrategy string // "conservative", "aggressive", "competitive"

	// Execution settings
	ExecutionTimeout   time.Duration
	ConfirmationBlocks uint64
	RetryAttempts      int
	RetryDelay         time.Duration

	// MEV protection
	EnableMEVProtection bool
	PrivateMempool      bool
	FlashbotsRelay      string

	// Monitoring
	EnableDetailedLogs bool
	TrackPerformance   bool
}

// ExecutionState tracks the state of an ongoing execution
type ExecutionState struct {
	Opportunity       *pkgtypes.ArbitrageOpportunity
	TransactionHash   common.Hash
	Status            ExecutionStatus
	StartTime         time.Time
	SubmissionTime    time.Time
	ConfirmationTime  time.Time
	GasUsed           uint64
	EffectiveGasPrice *big.Int
	ActualProfit      *math.UniversalDecimal
	Error             error
}

// ExecutionStatus represents the current status of an execution
type ExecutionStatus string

const (
	StatusPending   ExecutionStatus = "pending"
	StatusSubmitted ExecutionStatus = "submitted"
	StatusConfirmed ExecutionStatus = "confirmed"
	StatusFailed    ExecutionStatus = "failed"
	StatusReverted  ExecutionStatus = "reverted"
)

// FlashSwapCalldata represents the data needed for a flash swap execution
type FlashSwapCalldata struct {
	InitiatorPool common.Address
	TokenPath     []common.Address
	Pools         []common.Address
	AmountIn      *big.Int
	MinAmountOut  *big.Int
	Recipient     common.Address
	Data          []byte
}

type arbitrageLogParser interface {
	ParseArbitrageExecuted(types.Log) (*contracts.ArbitrageExecutorArbitrageExecuted, error)
}

type tokenDescriptor struct {
	Symbol   string
	Decimals uint8
	PriceUSD *big.Rat
}

var (
	revertErrorSelector = []byte{0x08, 0xc3, 0x79, 0xa0} // keccak256("Error(string)")[:4]
	revertPanicSelector = []byte{0x4e, 0x48, 0x7b, 0x71} // keccak256("Panic(uint256)")[:4]
)

// NewFlashSwapExecutor creates a new flash swap executor
func NewFlashSwapExecutor(
	client *ethclient.Client,
	logger *logger.Logger,
	keyManager *security.KeyManager,
	gasEstimator *arbitrum.L2GasEstimator,
	flashSwapContract,
	arbitrageContract common.Address,
	config ExecutionConfig,
) *FlashSwapExecutor {

	executor := &FlashSwapExecutor{
		client:            client,
		logger:            logger,
		keyManager:        keyManager,
		gasEstimator:      gasEstimator,
		decimalConverter:  math.NewDecimalConverter(),
		flashSwapContract: flashSwapContract,
		arbitrageContract: arbitrageContract,
		config:            config,
		pendingExecutions: make(map[common.Hash]*ExecutionState),
		executionHistory:  make([]*ExecutionResult, 0),
		tokenRegistry:     defaultTokenRegistry(),
		ethReferenceToken: common.HexToAddress("0x82aF49447D8a07e3bd95BD0d56f35241523fBab1"),
	}

	if client != nil && flashSwapContract != (common.Address{}) {
		if binding, err := flashswap.NewBaseFlashSwapper(flashSwapContract, client); err != nil {
			if logger != nil {
				logger.Warn(fmt.Sprintf("Failed to initialise flash swap contract binding: %v", err))
			}
		} else {
			executor.flashSwapBinding = binding
		}
	}

	if client != nil && arbitrageContract != (common.Address{}) {
		if binding, err := contracts.NewArbitrageExecutor(arbitrageContract, client); err != nil {
			if logger != nil {
				logger.Warn(fmt.Sprintf("Failed to initialise arbitrage contract binding: %v", err))
			}
		} else {
			executor.arbitrageBinding = binding
		}
	}

	// Initialize counters
	executor.totalProfit, _ = executor.decimalConverter.FromString("0", 18, "ETH")
	executor.totalGasCost, _ = executor.decimalConverter.FromString("0", 18, "ETH")

	// Set default configuration
	executor.setDefaultConfig()

	return executor
}

// setDefaultConfig sets default configuration values
func (executor *FlashSwapExecutor) setDefaultConfig() {
	if executor.config.MaxSlippage == nil {
		executor.config.MaxSlippage, _ = executor.decimalConverter.FromString("1", 4, "PERCENT") // 1%
	}

	if executor.config.MinProfitThreshold == nil {
		executor.config.MinProfitThreshold, _ = executor.decimalConverter.FromString("0.01", 18, "ETH")
	}

	if executor.config.MaxPositionSize == nil {
		executor.config.MaxPositionSize, _ = executor.decimalConverter.FromString("10", 18, "ETH")
	}

	if executor.config.GasLimitMultiplier == 0 {
		executor.config.GasLimitMultiplier = 1.2 // 20% buffer
	}

	if executor.config.ExecutionTimeout == 0 {
		executor.config.ExecutionTimeout = 30 * time.Second
	}

	if executor.config.ConfirmationBlocks == 0 {
		executor.config.ConfirmationBlocks = 1 // Arbitrum has fast finality
	}

	if executor.config.RetryAttempts == 0 {
		executor.config.RetryAttempts = 3
	}

	if executor.config.RetryDelay == 0 {
		executor.config.RetryDelay = 2 * time.Second
	}

	if executor.config.PriorityFeeStrategy == "" {
		executor.config.PriorityFeeStrategy = "competitive"
	}
}

// ExecuteArbitrage executes an arbitrage opportunity using flash swaps
func (executor *FlashSwapExecutor) ExecuteArbitrage(ctx context.Context, opportunity *pkgtypes.ArbitrageOpportunity) (*ExecutionResult, error) {
	// Validate opportunity before execution
	if err := executor.validateOpportunity(opportunity); err != nil {
		return nil, fmt.Errorf("opportunity validation failed: %w", err)
	}

	profitEstimate, err := executor.profitEstimateWei(opportunity)
	if err != nil {
		return nil, fmt.Errorf("unable to determine profit estimate: %w", err)
	}

	profitDisplay := ethAmountString(executor.decimalConverter, nil, profitEstimate)
	executor.logger.Info(fmt.Sprintf("🚀 Executing arbitrage opportunity: %s ETH profit expected",
		profitDisplay))

	// Create execution state
	executionState := &ExecutionState{
		Opportunity: opportunity,
		Status:      StatusPending,
		StartTime:   time.Now(),
	}

	// Prepare flash swap transaction
	flashSwapData, err := executor.prepareFlashSwap(opportunity)
	if err != nil {
		result := executor.createFailedResult(executionState, fmt.Errorf("failed to prepare flash swap: %w", err))
		return result, nil
	}

	// Get transaction options with dynamic gas pricing
	transactOpts, err := executor.getTransactionOptions(ctx, flashSwapData)
	if err != nil {
		return executor.createFailedResult(executionState, fmt.Errorf("failed to get transaction options: %w", err)), nil
	}

	// Execute with retry logic
	var result *ExecutionResult
	for attempt := 0; attempt <= executor.config.RetryAttempts; attempt++ {
		if attempt > 0 {
			executor.logger.Info(fmt.Sprintf("Retrying execution attempt %d/%d", attempt, executor.config.RetryAttempts))
			time.Sleep(executor.config.RetryDelay)
		}

		result = executor.executeWithTimeout(ctx, executionState, flashSwapData, transactOpts)

		// If successful or non-retryable error, break
		errorMsg := ""
		if result.Error != nil {
			errorMsg = result.Error.Error()
		}
		if result.Success || !executor.isRetryableError(errorMsg) {
			break
		}

		// Update gas price for retry
		if attempt < executor.config.RetryAttempts {
			transactOpts, err = executor.updateGasPriceForRetry(ctx, transactOpts, attempt)
			if err != nil {
				executor.logger.Warn(fmt.Sprintf("Failed to update gas price for retry: %v", err))
			}
		}
	}

	// Update statistics
	executor.updateExecutionStats(result)

	status := "Unknown"
	if result.Success {
		status = "Success"
	} else if result.Error != nil {
		status = "Failed"
	} else {
		status = "Incomplete"
	}

	executor.logger.Info(fmt.Sprintf("✅ Arbitrage execution completed: %s", status))
	if result.Success && result.ProfitRealized != nil {
		// Note: opportunity.NetProfit is not directly accessible through ExecutionResult structure
		// So we just log that execution was successful with actual profit
		profitDisplay := ethAmountString(executor.decimalConverter, nil, result.ProfitRealized)
		executor.logger.Info(fmt.Sprintf("💰 Actual profit: %s ETH",
			profitDisplay))
	}

	return result, nil
}

// validateOpportunity validates an opportunity before execution
func (executor *FlashSwapExecutor) validateOpportunity(opportunity *pkgtypes.ArbitrageOpportunity) error {
	if opportunity == nil {
		return fmt.Errorf("opportunity cannot be nil")
	}

	if opportunity.AmountIn == nil || opportunity.AmountIn.Sign() <= 0 {
		return fmt.Errorf("invalid amount in for opportunity")
	}

	netProfit, err := executor.profitEstimateWei(opportunity)
	if err != nil {
		return fmt.Errorf("profit estimate invalid: %w", err)
	}

	// Check minimum profit threshold
	// Set to 0.001 ETH to ensure profitability after gas costs
	// Arbitrum gas cost: ~100k-200k gas @ 0.1-0.2 gwei = ~0.00002-0.00004 ETH
	// 0.001 ETH provides ~25-50x gas cost safety margin
	minProfitWei := big.NewInt(1000000000000000) // 0.001 ETH in wei
	if netProfit.Cmp(minProfitWei) < 0 {
		return fmt.Errorf("profit %s below minimum threshold %s",
			netProfit.String(),
			minProfitWei.String())
	}

	// Check maximum position size
	maxPositionWei := big.NewInt(1000000000000000000) // 1 ETH in wei
	if opportunity.AmountIn.Cmp(maxPositionWei) > 0 {
		return fmt.Errorf("position size %s exceeds maximum %s",
			opportunity.AmountIn.String(),
			maxPositionWei.String())
	}

	// Check price impact
	maxPriceImpact := 5.0 // 5% max
	if opportunity.PriceImpact > maxPriceImpact {
		return fmt.Errorf("price impact %.2f%% too high",
			opportunity.PriceImpact)
	}

	// Check confidence level
	if opportunity.Confidence < 0.7 {
		return fmt.Errorf("confidence level %.1f%% too low", opportunity.Confidence*100)
	}

	// Check execution path
	if len(opportunity.Path) < 2 {
		return fmt.Errorf("empty execution path")
	}

	// Basic validation for path
	if len(opportunity.Path) < 2 {
		return fmt.Errorf("path must have at least 2 tokens")
	}

	return nil
}

// prepareFlashSwap prepares the flash swap transaction data
func (executor *FlashSwapExecutor) prepareFlashSwap(opportunity *pkgtypes.ArbitrageOpportunity) (*FlashSwapCalldata, error) {
	if opportunity == nil {
		return nil, fmt.Errorf("opportunity cannot be nil")
	}

	if len(opportunity.Path) < 2 {
		return nil, fmt.Errorf("path must have at least 2 tokens")
	}

	if opportunity.AmountIn == nil || opportunity.AmountIn.Sign() <= 0 {
		return nil, fmt.Errorf("opportunity amount in must be positive")
	}

	// Convert path strings to token addresses
	tokenPath := make([]common.Address, len(opportunity.Path))
	for i, tokenAddr := range opportunity.Path {
		tokenPath[i] = common.HexToAddress(tokenAddr)
	}

	// Use pool addresses from opportunity if available
	poolAddresses := make([]common.Address, len(opportunity.Pools))
	for i, poolAddr := range opportunity.Pools {
		poolAddresses[i] = common.HexToAddress(poolAddr)
	}

	if len(poolAddresses) == 0 {
		return nil, fmt.Errorf("opportunity missing pool data")
	}

	profitEstimate, err := executor.profitEstimateWei(opportunity)
	if err != nil {
		return nil, err
	}

	expectedOutput := new(big.Int).Add(opportunity.AmountIn, profitEstimate)
	if expectedOutput.Sign() <= 0 {
		return nil, fmt.Errorf("expected output amount must be positive")
	}

	slippageFraction := executor.resolveSlippage(opportunity)
	if slippageFraction < 0 {
		slippageFraction = 0
	}
	if slippageFraction >= 1 {
		slippageFraction = 0.99
	}

	minAmountOut := new(big.Int).Set(expectedOutput)
	if slippageFraction > 0 {
		minOutputFloat := new(big.Float).Mul(new(big.Float).SetInt(expectedOutput), big.NewFloat(1-slippageFraction))
		minAmountOut = new(big.Int)
		minOutputFloat.Int(minAmountOut)
	}

	if minAmountOut.Sign() <= 0 {
		return nil, fmt.Errorf("minimum amount out must be positive")
	}

	calldata := &FlashSwapCalldata{
		InitiatorPool: poolAddresses[0], // First pool initiates the flash swap
		TokenPath:     tokenPath,
		Pools:         poolAddresses,
		AmountIn:      new(big.Int).Set(opportunity.AmountIn),
		MinAmountOut:  minAmountOut,
		Recipient:     executor.arbitrageContract, // Arbitrage contract receives callback
		Data:          executor.encodeArbitrageData(tokenPath, poolAddresses, nil, minAmountOut),
	}

	return calldata, nil
}

// encodeArbitrageData encodes the arbitrage execution data
func (executor *FlashSwapExecutor) encodeArbitrageData(tokenPath, poolPath []common.Address, fees []*big.Int, minAmountOut *big.Int) []byte {
	payload, err := encodeFlashSwapCallback(tokenPath, poolPath, fees, minAmountOut)
	if err != nil {
		if executor.logger != nil {
			executor.logger.Warn(fmt.Sprintf("Failed to encode flash swap callback data: %v", err))
		}
		// Provide a structured fallback payload for debugging purposes
		fallback := []string{"arbitrage"}
		for _, token := range tokenPath {
			fallback = append(fallback, token.Hex())
		}
		return []byte(strings.Join(fallback, ":"))
	}
	return payload
}

func (executor *FlashSwapExecutor) profitEstimateWei(opportunity *pkgtypes.ArbitrageOpportunity) (*big.Int, error) {
	if opportunity == nil {
		return nil, fmt.Errorf("opportunity cannot be nil")
	}

	candidates := []*big.Int{
		opportunity.NetProfit,
		opportunity.Profit,
		opportunity.EstimatedProfit,
	}

	for _, candidate := range candidates {
		if candidate != nil && candidate.Sign() > 0 {
			return new(big.Int).Set(candidate), nil
		}
	}

	return nil, fmt.Errorf("opportunity profit estimate unavailable or non-positive")
}

func (executor *FlashSwapExecutor) resolveSlippage(opportunity *pkgtypes.ArbitrageOpportunity) float64 {
	if opportunity != nil && opportunity.MaxSlippage > 0 {
		if opportunity.MaxSlippage > 1 {
			return opportunity.MaxSlippage / 100.0
		}
		return opportunity.MaxSlippage
	}

	if executor.config.MaxSlippage != nil && executor.config.MaxSlippage.Value != nil {
		numerator := new(big.Float).SetInt(executor.config.MaxSlippage.Value)
		denominator := big.NewFloat(stdmath.Pow10(int(executor.config.MaxSlippage.Decimals)))
		if denominator.Sign() != 0 {
			percent, _ := new(big.Float).Quo(numerator, denominator).Float64()
			if percent > 0 {
				return percent / 100.0
			}
		}
	}

	return 0.01 // Default to 1% if nothing provided
}

func (executor *FlashSwapExecutor) gasEstimateWei(opportunity *pkgtypes.ArbitrageOpportunity) *big.Int {
	if opportunity == nil {
		return nil
	}
	if opportunity.GasEstimate != nil {
		return new(big.Int).Set(opportunity.GasEstimate)
	}
	if opportunity.GasCost != nil {
		return new(big.Int).Set(opportunity.GasCost)
	}
	return nil
}

// getTransactionOptions prepares transaction options with dynamic gas pricing
func (executor *FlashSwapExecutor) getTransactionOptions(ctx context.Context, flashSwapData *FlashSwapCalldata) (*bind.TransactOpts, error) {
	if executor.client == nil {
		return nil, fmt.Errorf("ethereum client not configured")
	}
	if executor.keyManager == nil {
		return nil, fmt.Errorf("key manager not configured")
	}
	if flashSwapData == nil {
		return nil, fmt.Errorf("flash swap data cannot be nil")
	}

	privateKey, err := executor.keyManager.GetActivePrivateKey()
	if err != nil {
		return nil, fmt.Errorf("failed to get private key: %w", err)
	}

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

	transactOpts, err := bind.NewKeyedTransactorWithChainID(privateKey, chainID)
	if err != nil {
		return nil, fmt.Errorf("failed to create transactor: %w", err)
	}

	nonce, err := executor.client.PendingNonceAt(ctx, transactOpts.From)
	if err != nil {
		return nil, fmt.Errorf("failed to fetch account nonce: %w", err)
	}
	transactOpts.Nonce = new(big.Int).SetUint64(nonce)

	params, err := executor.buildFlashSwapParams(flashSwapData)
	if err != nil {
		return nil, err
	}

	callData, err := executor.encodeFlashSwapCall(flashSwapData.Pools[0], params)
	if err != nil {
		return nil, fmt.Errorf("failed to encode flash swap calldata: %w", err)
	}

	gasLimit := uint64(800000) // Sensible default for complex flash swaps
	var candidateFeeCap *big.Int
	var candidateTip *big.Int

	if executor.flashSwapContract == (common.Address{}) {
		executor.logger.Warn("Flash swap contract address not configured; using default gas limit")
	} else {
		callMsg := ethereum.CallMsg{
			From: transactOpts.From,
			To:   &executor.flashSwapContract,
			Data: callData,
			Value: func() *big.Int {
				if transactOpts.Value == nil {
					return big.NewInt(0)
				}
				return transactOpts.Value
			}(),
		}

		if estimatedGas, gasErr := executor.client.EstimateGas(ctx, callMsg); gasErr == nil && estimatedGas > 0 {
			gasLimit = estimatedGas
		} else {
			if gasErr != nil {
				executor.logger.Warn(fmt.Sprintf("Gas estimation via RPC failed: %v", gasErr))
			}
			if executor.gasEstimator != nil {
				dummyTx := types.NewTx(&types.DynamicFeeTx{
					ChainID: chainID,
					Nonce:   nonce,
					To:      &executor.flashSwapContract,
					Value:   callMsg.Value,
					Data:    callData,
				})

				if estimate, estErr := executor.gasEstimator.EstimateL2Gas(ctx, dummyTx); estErr == nil {
					if estimate.GasLimit > 0 {
						gasLimit = estimate.GasLimit
					}
					candidateFeeCap = estimate.MaxFeePerGas
					candidateTip = estimate.MaxPriorityFee
				} else {
					executor.logger.Warn(fmt.Sprintf("Arbitrum gas estimator fallback failed: %v", estErr))
				}
			}
		}
	}

	multiplier := executor.config.GasLimitMultiplier
	if multiplier <= 0 {
		multiplier = 1.2
	}
	adjustedGasLimit := gasLimit
	if multiplier != 1.0 {
		adjusted := uint64(stdmath.Ceil(float64(gasLimit) * multiplier))
		if adjusted < gasLimit {
			adjusted = gasLimit
		}
		if adjusted == 0 {
			adjusted = gasLimit
		}
		adjustedGasLimit = adjusted
	}
	if adjustedGasLimit == 0 {
		adjustedGasLimit = gasLimit
	}
	transactOpts.GasLimit = adjustedGasLimit

	if candidateTip == nil {
		if suggestedTip, tipErr := executor.client.SuggestGasTipCap(ctx); tipErr == nil {
			candidateTip = suggestedTip
		} else {
			candidateTip = big.NewInt(100000000) // 0.1 gwei fallback
			executor.logger.Debug(fmt.Sprintf("Using fallback priority fee: %s", candidateTip.String()))
		}
	}

	if candidateFeeCap == nil {
		if header, headerErr := executor.client.HeaderByNumber(ctx, nil); headerErr == nil && header != nil && header.BaseFee != nil {
			candidateFeeCap = new(big.Int).Add(new(big.Int).Mul(header.BaseFee, big.NewInt(2)), candidateTip)
		} else {
			defaultBase := big.NewInt(1000000000) // 1 gwei
			candidateFeeCap = new(big.Int).Add(defaultBase, candidateTip)
		}
	}

	transactOpts.GasTipCap = new(big.Int).Set(candidateTip)
	transactOpts.GasFeeCap = new(big.Int).Set(candidateFeeCap)

	baseStr := fmt.Sprintf("%d", gasLimit)
	maxFeeStr := "<nil>"
	tipStr := "<nil>"
	if transactOpts.GasFeeCap != nil {
		maxFeeStr = transactOpts.GasFeeCap.String()
	}
	if transactOpts.GasTipCap != nil {
		tipStr = transactOpts.GasTipCap.String()
	}
	executor.logger.Debug(fmt.Sprintf("Gas estimate - Base: %s, Adjusted: %d, MaxFee: %s, Priority: %s",
		baseStr,
		transactOpts.GasLimit,
		maxFeeStr,
		tipStr))

	// Apply priority fee strategy and enforce configured limits
	executor.applyPriorityFeeStrategy(transactOpts)
	executor.enforceGasBounds(transactOpts)

	return transactOpts, nil
}

func (executor *FlashSwapExecutor) buildFlashSwapParams(flashSwapData *FlashSwapCalldata) (flashswap.FlashSwapParams, error) {
	if flashSwapData == nil {
		return flashswap.FlashSwapParams{}, fmt.Errorf("flash swap data cannot be nil")
	}

	if len(flashSwapData.TokenPath) < 2 {
		return flashswap.FlashSwapParams{}, fmt.Errorf("token path must include at least two tokens")
	}

	if len(flashSwapData.Pools) == 0 {
		return flashswap.FlashSwapParams{}, fmt.Errorf("pool path cannot be empty")
	}

	if flashSwapData.AmountIn == nil || flashSwapData.AmountIn.Sign() <= 0 {
		return flashswap.FlashSwapParams{}, fmt.Errorf("amount in must be positive")
	}

	if flashSwapData.MinAmountOut == nil || flashSwapData.MinAmountOut.Sign() <= 0 {
		return flashswap.FlashSwapParams{}, fmt.Errorf("minimum amount out must be positive")
	}

	params := flashswap.FlashSwapParams{
		Token0:  flashSwapData.TokenPath[0],
		Token1:  flashSwapData.TokenPath[1],
		Amount0: flashSwapData.AmountIn,
		Amount1: big.NewInt(0),
		To:      executor.arbitrageContract,
		Data:    flashSwapData.Data,
	}

	return params, nil
}

func (executor *FlashSwapExecutor) encodeFlashSwapCall(pool common.Address, params flashswap.FlashSwapParams) ([]byte, error) {
	if pool == (common.Address{}) {
		return nil, fmt.Errorf("pool address cannot be zero")
	}

	flashSwapABI, err := flashswap.BaseFlashSwapperMetaData.GetAbi()
	if err != nil {
		return nil, fmt.Errorf("failed to load BaseFlashSwapper ABI: %w", err)
	}

	return flashSwapABI.Pack("executeFlashSwap", pool, params)
}

func (executor *FlashSwapExecutor) maxGasPriceWei() *big.Int {
	if executor.config.MaxGasPrice == nil || executor.config.MaxGasPrice.Value == nil {
		return nil
	}

	if executor.decimalConverter == nil {
		return new(big.Int).Set(executor.config.MaxGasPrice.Value)
	}

	weiDecimal := executor.decimalConverter.ToWei(executor.config.MaxGasPrice)
	if weiDecimal == nil || weiDecimal.Value == nil {
		return new(big.Int).Set(executor.config.MaxGasPrice.Value)
	}

	return new(big.Int).Set(weiDecimal.Value)
}

func (executor *FlashSwapExecutor) enforceGasBounds(transactOpts *bind.TransactOpts) {
	if transactOpts == nil {
		return
	}

	maxGas := executor.maxGasPriceWei()
	if maxGas == nil || maxGas.Sign() <= 0 {
		return
	}

	if transactOpts.GasFeeCap != nil && transactOpts.GasFeeCap.Cmp(maxGas) > 0 {
		transactOpts.GasFeeCap = new(big.Int).Set(maxGas)
		executor.logger.Debug(fmt.Sprintf("Clamped gas fee cap to configured maximum %s", maxGas.String()))
	}

	if transactOpts.GasTipCap != nil && transactOpts.GasTipCap.Cmp(maxGas) > 0 {
		transactOpts.GasTipCap = new(big.Int).Set(maxGas)
		executor.logger.Debug(fmt.Sprintf("Clamped priority fee to configured maximum %s", maxGas.String()))
	}

	if transactOpts.GasFeeCap != nil && transactOpts.GasTipCap != nil && transactOpts.GasFeeCap.Cmp(transactOpts.GasTipCap) < 0 {
		transactOpts.GasFeeCap = new(big.Int).Set(transactOpts.GasTipCap)
	}
}

// applyPriorityFeeStrategy adjusts gas pricing based on strategy
func (executor *FlashSwapExecutor) applyPriorityFeeStrategy(transactOpts *bind.TransactOpts) {
	switch executor.config.PriorityFeeStrategy {
	case "aggressive":
		// Increase priority fee by 50%
		if transactOpts.GasTipCap != nil {
			newTip := new(big.Int).Mul(transactOpts.GasTipCap, big.NewInt(150))
			transactOpts.GasTipCap = new(big.Int).Div(newTip, big.NewInt(100))
		}
	case "competitive":
		// Increase priority fee by 25%
		if transactOpts.GasTipCap != nil {
			newTip := new(big.Int).Mul(transactOpts.GasTipCap, big.NewInt(125))
			transactOpts.GasTipCap = new(big.Int).Div(newTip, big.NewInt(100))
		}
	case "conservative":
		// Use default priority fee (no change)
	}
}

// executeWithTimeout executes the flash swap with timeout protection
func (executor *FlashSwapExecutor) executeWithTimeout(
	ctx context.Context,
	executionState *ExecutionState,
	flashSwapData *FlashSwapCalldata,
	transactOpts *bind.TransactOpts,
) *ExecutionResult {

	// Create timeout context
	timeoutCtx, cancel := context.WithTimeout(ctx, executor.config.ExecutionTimeout)
	defer cancel()

	// Submit transaction
	tx, err := executor.submitTransaction(timeoutCtx, flashSwapData, transactOpts)
	if err != nil {
		return executor.createFailedResult(executionState, fmt.Errorf("transaction submission failed: %w", err))
	}

	executionState.TransactionHash = tx.Hash()
	executionState.Status = StatusSubmitted
	executionState.SubmissionTime = time.Now()
	executor.pendingExecutions[tx.Hash()] = executionState

	executor.logger.Info(fmt.Sprintf("📤 Transaction submitted: %s", tx.Hash().Hex()))

	// Wait for confirmation
	receipt, err := executor.waitForConfirmation(timeoutCtx, tx.Hash())
	if err != nil {
		return executor.createFailedResult(executionState, fmt.Errorf("confirmation failed: %w", err))
	}

	executionState.ConfirmationTime = time.Now()
	executionState.GasUsed = receipt.GasUsed
	executionState.EffectiveGasPrice = receipt.EffectiveGasPrice

	// Check transaction status
	if receipt.Status == types.ReceiptStatusFailed {
		executionState.Status = StatusReverted
		revertReason := executor.fetchRevertReason(timeoutCtx, tx.Hash(), receipt)
		if revertReason != "" {
			return executor.createFailedResult(executionState, fmt.Errorf("transaction reverted: %s", revertReason))
		}
		return executor.createFailedResult(executionState, fmt.Errorf("transaction reverted"))
	}

	executionState.Status = StatusConfirmed

	// Calculate actual results
	actualProfit, err := executor.calculateActualProfit(receipt, executionState.Opportunity)
	if err != nil {
		executor.logger.Warn(fmt.Sprintf("Failed to calculate actual profit: %v", err))
		if estimate, estimateErr := executor.profitEstimateWei(executionState.Opportunity); estimateErr == nil {
			actualProfit = universalFromWei(executor.decimalConverter, estimate, "ETH")
		} else {
			actualProfit, _ = math.NewUniversalDecimal(big.NewInt(0), 18, "ETH")
		}
	}

	executionState.ActualProfit = actualProfit

	// Create successful result
	return executor.createSuccessfulResult(executionState, receipt)
}

// submitTransaction submits the flash swap transaction
func (executor *FlashSwapExecutor) submitTransaction(
	ctx context.Context,
	flashSwapData *FlashSwapCalldata,
	transactOpts *bind.TransactOpts,
) (*types.Transaction, error) {
	if executor.flashSwapBinding == nil {
		return nil, fmt.Errorf("flash swap contract binding not initialised")
	}

	if executor.arbitrageContract == (common.Address{}) {
		return nil, fmt.Errorf("arbitrage contract address not configured")
	}

	params, err := executor.buildFlashSwapParams(flashSwapData)
	if err != nil {
		return nil, err
	}

	executor.logger.Debug("Submitting flash swap transaction...")
	executor.logger.Debug(fmt.Sprintf("  Initiator Pool: %s", flashSwapData.InitiatorPool.Hex()))
	executor.logger.Debug(fmt.Sprintf("  Amount In: %s", flashSwapData.AmountIn.String()))
	executor.logger.Debug(fmt.Sprintf("  Min Amount Out: %s", flashSwapData.MinAmountOut.String()))
	executor.logger.Debug(fmt.Sprintf("  Token Path: %d tokens", len(flashSwapData.TokenPath)))
	executor.logger.Debug(fmt.Sprintf("  Pool Path: %d pools", len(flashSwapData.Pools)))

	opts := *transactOpts
	opts.Context = ctx

	tx, err := executor.flashSwapBinding.ExecuteFlashSwap(&opts, flashSwapData.Pools[0], params)
	if err != nil {
		return nil, err
	}

	return tx, nil
}

// waitForConfirmation waits for transaction confirmation
func (executor *FlashSwapExecutor) waitForConfirmation(ctx context.Context, txHash common.Hash) (*types.Receipt, error) {
	executor.logger.Debug(fmt.Sprintf("Waiting for confirmation of transaction: %s", txHash.Hex()))

	ticker := time.NewTicker(2 * time.Second)
	defer ticker.Stop()

	for {
		select {
		case <-ctx.Done():
			return nil, fmt.Errorf("timeout waiting for confirmation: %w", ctx.Err())
		case <-ticker.C:
			receipt, err := executor.client.TransactionReceipt(ctx, txHash)
			if err != nil {
				if errors.Is(err, ethereum.NotFound) {
					continue
				}
				return nil, fmt.Errorf("failed to fetch transaction receipt: %w", err)
			}

			if receipt == nil {
				continue
			}

			if receipt.BlockNumber == nil || executor.config.ConfirmationBlocks <= 1 {
				return receipt, nil
			}

			targetBlock := new(big.Int).Add(receipt.BlockNumber, big.NewInt(int64(executor.config.ConfirmationBlocks-1)))

			for {
				select {
				case <-ctx.Done():
					return nil, fmt.Errorf("timeout waiting for confirmations: %w", ctx.Err())
				case <-ticker.C:
					header, headerErr := executor.client.HeaderByNumber(ctx, nil)
					if headerErr != nil {
						if errors.Is(headerErr, ethereum.NotFound) {
							continue
						}
						return nil, fmt.Errorf("failed to fetch latest block header: %w", headerErr)
					}

					if header != nil && header.Number.Cmp(targetBlock) >= 0 {
						return receipt, nil
					}
				}
			}
		}
	}
}

func (executor *FlashSwapExecutor) fetchRevertReason(ctx context.Context, txHash common.Hash, receipt *types.Receipt) string {
	if executor.client == nil || receipt == nil {
		return ""
	}

	callCtx := ctx
	if callCtx == nil || callCtx.Err() != nil {
		var cancel context.CancelFunc
		callCtx, cancel = context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
	}

	tx, _, err := executor.client.TransactionByHash(callCtx, txHash)
	if err != nil || tx == nil {
		if err != nil && executor.logger != nil {
			executor.logger.Debug(fmt.Sprintf("Failed to fetch transaction for revert reason: %v", err))
		}
		return ""
	}

	if tx.To() == nil {
		return ""
	}

	msg := ethereum.CallMsg{
		To:    tx.To(),
		Data:  tx.Data(),
		Gas:   tx.Gas(),
		Value: tx.Value(),
	}

	switch tx.Type() {
	case types.DynamicFeeTxType:
		msg.GasFeeCap = tx.GasFeeCap()
		msg.GasTipCap = tx.GasTipCap()
	default:
		msg.GasPrice = tx.GasPrice()
	}

	revertData, callErr := executor.client.CallContract(callCtx, msg, receipt.BlockNumber)
	if callErr != nil || len(revertData) == 0 {
		if callErr != nil && executor.logger != nil {
			executor.logger.Debug(fmt.Sprintf("Failed to retrieve revert data: %v", callErr))
		}
		return ""
	}

	reason := parseRevertReason(revertData)
	if reason == "" {
		return fmt.Sprintf("0x%s", hex.EncodeToString(revertData))
	}
	return reason
}

func parseRevertReason(data []byte) string {
	if len(data) < 4 {
		return ""
	}

	selector := data[:4]
	payload := data[4:]

	switch {
	case bytes.Equal(selector, revertErrorSelector):
		strType, err := abi.NewType("string", "", nil)
		if err != nil {
			return ""
		}
		args := abi.Arguments{{Type: strType}}
		values, err := args.Unpack(payload)
		if err != nil || len(values) == 0 {
			return ""
		}
		if reason, ok := values[0].(string); ok {
			return reason
		}
	case bytes.Equal(selector, revertPanicSelector):
		uintType, err := abi.NewType("uint256", "", nil)
		if err != nil {
			return ""
		}
		args := abi.Arguments{{Type: uintType}}
		values, err := args.Unpack(payload)
		if err != nil || len(values) == 0 {
			return ""
		}
		if code, ok := values[0].(*big.Int); ok {
			return fmt.Sprintf("panic code 0x%s", strings.ToLower(code.Text(16)))
		}
	default:
		// Some contracts return raw reason strings without selector
		if utf8String := extractUTF8String(data); utf8String != "" {
			return utf8String
		}
	}

	return ""
}

func extractUTF8String(data []byte) string {
	if len(data) == 0 {
		return ""
	}

	trimmed := bytes.Trim(data, "\x00")
	if len(trimmed) == 0 {
		return ""
	}

	for _, b := range trimmed {
		// Allow printable ASCII range plus common whitespace
		if (b < 0x20 || b > 0x7E) && b != 0x0a && b != 0x0d && b != 0x09 {
			return ""
		}
	}

	return string(trimmed)
}

// calculateActualProfit calculates the actual profit from the transaction
func (executor *FlashSwapExecutor) calculateActualProfit(receipt *types.Receipt, opportunity *pkgtypes.ArbitrageOpportunity) (*math.UniversalDecimal, error) {
	if receipt == nil {
		return nil, fmt.Errorf("transaction receipt cannot be nil")
	}

	gasCostWei := executor.calculateGasCostWei(receipt)

	var parsedEvent *contracts.ArbitrageExecutorArbitrageExecuted
	if executor.arbitrageBinding != nil {
		for _, log := range receipt.Logs {
			if log.Address != executor.arbitrageContract {
				continue
			}

			event, err := executor.arbitrageBinding.ParseArbitrageExecuted(*log)
			if err != nil {
				if executor.logger != nil {
					executor.logger.Debug("Failed to parse arbitrage execution log", "error", err)
				}
				continue
			}

			parsedEvent = event
			break
		}
	}

	profitAmount := executor.extractProfitAmount(parsedEvent, opportunity)
	if profitAmount == nil {
		return nil, fmt.Errorf("unable to determine profit from receipt or opportunity")
	}

	profitToken, descriptor := executor.resolveProfitDescriptor(parsedEvent, opportunity)

	gasCostInToken := executor.convertGasCostToTokenUnits(gasCostWei, profitToken, descriptor)

	netProfit := new(big.Int).Set(profitAmount)
	if gasCostInToken != nil {
		netProfit.Sub(netProfit, gasCostInToken)
	}

	actualProfitDecimal, err := math.NewUniversalDecimal(netProfit, descriptor.Decimals, descriptor.Symbol)
	if err != nil {
		return nil, err
	}

	return actualProfitDecimal, nil
}

func (executor *FlashSwapExecutor) calculateGasCostWei(receipt *types.Receipt) *big.Int {
	if receipt == nil {
		return big.NewInt(0)
	}

	gasUsedBigInt := new(big.Int).SetUint64(receipt.GasUsed)
	gasPrice := receipt.EffectiveGasPrice
	if gasPrice == nil {
		gasPrice = big.NewInt(0)
	}

	return new(big.Int).Mul(gasUsedBigInt, gasPrice)
}

func (executor *FlashSwapExecutor) extractProfitAmount(event *contracts.ArbitrageExecutorArbitrageExecuted, opportunity *pkgtypes.ArbitrageOpportunity) *big.Int {
	if event != nil && event.Profit != nil {
		return new(big.Int).Set(event.Profit)
	}

	if opportunity == nil {
		return nil
	}

	if opportunity.NetProfit != nil && opportunity.NetProfit.Sign() > 0 {
		return new(big.Int).Set(opportunity.NetProfit)
	}

	if estimate, err := executor.profitEstimateWei(opportunity); err == nil {
		return estimate
	}

	return nil
}

func (executor *FlashSwapExecutor) resolveProfitDescriptor(event *contracts.ArbitrageExecutorArbitrageExecuted, opportunity *pkgtypes.ArbitrageOpportunity) (common.Address, tokenDescriptor) {
	var tokenAddr common.Address

	if event != nil && len(event.Tokens) > 0 {
		tokenAddr = event.Tokens[len(event.Tokens)-1]
	} else if opportunity != nil && opportunity.TokenOut != (common.Address{}) {
		tokenAddr = opportunity.TokenOut
	}

	descriptor, ok := executor.tokenRegistry[tokenAddr]
	if !ok {
		if opportunity != nil && opportunity.Quantities != nil {
			descriptor.Symbol = opportunity.Quantities.NetProfit.Symbol
			descriptor.Decimals = opportunity.Quantities.NetProfit.Decimals
		}
		if descriptor.Symbol == "" {
			descriptor.Symbol = "ETH"
		}
		if descriptor.Decimals == 0 {
			descriptor.Decimals = 18
		}
	} else {
		// Copy to avoid mutating registry entry
		descriptor = tokenDescriptor{
			Symbol:   descriptor.Symbol,
			Decimals: descriptor.Decimals,
			PriceUSD: descriptor.PriceUSD,
		}
	}

	return tokenAddr, descriptor
}

func (executor *FlashSwapExecutor) convertGasCostToTokenUnits(gasCostWei *big.Int, tokenAddr common.Address, descriptor tokenDescriptor) *big.Int {
	if gasCostWei == nil || gasCostWei.Sign() == 0 {
		return big.NewInt(0)
	}

	if tokenAddr == (common.Address{}) || tokenAddr == executor.ethReferenceToken || strings.EqualFold(descriptor.Symbol, "ETH") || strings.EqualFold(descriptor.Symbol, "WETH") {
		return new(big.Int).Set(gasCostWei)
	}

	if descriptor.PriceUSD == nil {
		if executor.logger != nil {
			executor.logger.Debug("Gas cost conversion skipped due to missing price data", "token", descriptor.Symbol)
		}
		return nil
	}

	ethDescriptor, ok := executor.tokenRegistry[executor.ethReferenceToken]
	if !ok || ethDescriptor.PriceUSD == nil {
		if executor.logger != nil {
			executor.logger.Debug("Gas cost conversion skipped due to missing ETH pricing")
		}
		return nil
	}

	numerator := new(big.Rat).SetInt(gasCostWei)
	numerator.Mul(numerator, ethDescriptor.PriceUSD)

	denominator := new(big.Rat).Mul(new(big.Rat).SetInt(powerOfTenInt(18)), descriptor.PriceUSD)
	if denominator.Sign() == 0 {
		return nil
	}

	tokenAmount := new(big.Rat).Quo(numerator, denominator)
	tokenAmount.Mul(tokenAmount, new(big.Rat).SetInt(powerOfTenUint(descriptor.Decimals)))

	// Floor conversion to avoid overstating deductions
	result := new(big.Int).Quo(tokenAmount.Num(), tokenAmount.Denom())
	if result.Sign() == 0 && tokenAmount.Sign() > 0 {
		// Ensure non-zero deduction when value exists to avoid under-accounting
		result = big.NewInt(1)
	}

	return result
}

func defaultTokenRegistry() map[common.Address]tokenDescriptor {
	registry := map[common.Address]tokenDescriptor{
		common.Address{}: newTokenDescriptor("ETH", 18, 2000.0),
		common.HexToAddress("0x82aF49447D8a07e3bd95BD0d56f35241523fBab1"): newTokenDescriptor("WETH", 18, 2000.0),
		common.HexToAddress("0xaF88d065e77c8cC2239327C5EDb3A432268e5831"): newTokenDescriptor("USDC", 6, 1.0),
		common.HexToAddress("0xff970a61a04b1ca14834a43f5de4533ebddb5cc8"): newTokenDescriptor("USDC.e", 6, 1.0),
		common.HexToAddress("0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9"): newTokenDescriptor("USDT", 6, 1.0),
		common.HexToAddress("0x2f2a2543b76a4166549f7aab2e75bef0aefc5b0f"): newTokenDescriptor("WBTC", 8, 43000.0),
		common.HexToAddress("0x912CE59144191C1204E64559FE8253a0e49E6548"): newTokenDescriptor("ARB", 18, 0.75),
		common.HexToAddress("0xfc5a1a6eb076a2c7ad06ed22c90d7e710e35ad0a"): newTokenDescriptor("GMX", 18, 45.0),
		common.HexToAddress("0xf97f4df75117a78c1a5a0dbb814af92458539fb4"): newTokenDescriptor("LINK", 18, 12.0),
		common.HexToAddress("0xfa7f8980b0f1e64a2062791cc3b0871572f1f7f0"): newTokenDescriptor("UNI", 18, 8.0),
		common.HexToAddress("0xba5ddd1f9d7f570dc94a51479a000e3bce967196"): newTokenDescriptor("AAVE", 18, 85.0),
	}

	return registry
}

func newTokenDescriptor(symbol string, decimals uint8, price float64) tokenDescriptor {
	desc := tokenDescriptor{
		Symbol:   symbol,
		Decimals: decimals,
	}

	if price > 0 {
		desc.PriceUSD = new(big.Rat).SetFloat64(price)
	}

	return desc
}

func powerOfTenInt(exp int) *big.Int {
	return new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(exp)), nil)
}

func powerOfTenUint(exp uint8) *big.Int {
	return new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(exp)), nil)
}

// createSuccessfulResult creates a successful execution result
func (executor *FlashSwapExecutor) createSuccessfulResult(state *ExecutionState, receipt *types.Receipt) *ExecutionResult {
	// Convert UniversalDecimal to big.Int for ProfitRealized
	profitRealized := big.NewInt(0)
	if state.ActualProfit != nil {
		profitRealized = new(big.Int).Set(state.ActualProfit.Value)
	} else if state.Opportunity != nil && state.Opportunity.NetProfit != nil {
		profitRealized = new(big.Int).Set(state.Opportunity.NetProfit)
	} else if estimate, err := executor.profitEstimateWei(state.Opportunity); err == nil {
		profitRealized = estimate
	}

	// Create a minimal ArbitragePath based on the opportunity
	path := &ArbitragePath{
		Tokens:       []common.Address{state.Opportunity.TokenIn, state.Opportunity.TokenOut}, // Basic 2-token path
		Pools:        []*PoolInfo{},                                                           // Empty for now
		Protocols:    []string{},                                                              // Empty for now
		Fees:         []int64{},                                                               // Empty for now
		EstimatedGas: big.NewInt(0),                                                           // To be calculated
		NetProfit:    profitRealized,
		ROI:          0, // To be calculated
		LastUpdated:  time.Now(),
	}

	gasUsedBigInt := new(big.Int).SetUint64(receipt.GasUsed)
	gasCost := new(big.Int).Mul(gasUsedBigInt, receipt.EffectiveGasPrice)
	gasCostDecimal, _ := math.NewUniversalDecimal(gasCost, 18, "ETH")

	return &ExecutionResult{
		TransactionHash: state.TransactionHash,
		GasUsed:         receipt.GasUsed,
		GasPrice:        receipt.EffectiveGasPrice,
		GasCost:         gasCostDecimal,
		ProfitRealized:  profitRealized,
		Success:         true,
		Error:           nil,
		ErrorMessage:    "",
		Status:          "Success",
		ExecutionTime:   time.Since(state.StartTime),
		Path:            path,
	}
}

// createFailedResult creates a failed execution result
func (executor *FlashSwapExecutor) createFailedResult(state *ExecutionState, err error) *ExecutionResult {
	// Create a minimal ArbitragePath based on the opportunity
	path := &ArbitragePath{
		Tokens:       []common.Address{state.Opportunity.TokenIn, state.Opportunity.TokenOut}, // Basic 2-token path
		Pools:        []*PoolInfo{},                                                           // Empty for now
		Protocols:    []string{},                                                              // Empty for now
		Fees:         []int64{},                                                               // Empty for now
		EstimatedGas: big.NewInt(0),                                                           // To be calculated
		NetProfit:    big.NewInt(0),
		ROI:          0, // To be calculated
		LastUpdated:  time.Now(),
	}

	gasCostDecimal, _ := math.NewUniversalDecimal(big.NewInt(0), 18, "ETH")

	return &ExecutionResult{
		TransactionHash: state.TransactionHash,
		GasUsed:         0,
		GasPrice:        big.NewInt(0),
		GasCost:         gasCostDecimal,
		ProfitRealized:  big.NewInt(0),
		Success:         false,
		Error:           err,
		ErrorMessage:    err.Error(),
		Status:          "Failed",
		ExecutionTime:   time.Since(state.StartTime),
		Path:            path,
	}
}

// isRetryableError determines if an error is retryable
func (executor *FlashSwapExecutor) isRetryableError(errorMsg string) bool {
	retryableErrors := []string{
		"gas price too low",
		"nonce too low",
		"timeout",
		"network error",
		"connection refused",
		"transaction underpriced",
		"replacement transaction underpriced",
		"known transaction",
	}

	for _, retryable := range retryableErrors {
		if strings.Contains(strings.ToLower(errorMsg), strings.ToLower(retryable)) {
			return true
		}
	}

	return false
}

// updateGasPriceForRetry updates gas price for retry attempts
func (executor *FlashSwapExecutor) updateGasPriceForRetry(
	ctx context.Context,
	transactOpts *bind.TransactOpts,
	attempt int,
) (*bind.TransactOpts, error) {

	// Increase gas price by 20% for each retry
	multiplier := 1.0 + float64(attempt)*0.2

	if transactOpts.GasFeeCap != nil {
		newGasFeeCap := new(big.Float).Mul(
			new(big.Float).SetInt(transactOpts.GasFeeCap),
			big.NewFloat(multiplier),
		)
		newGasFeeCapInt, _ := newGasFeeCap.Int(nil)
		transactOpts.GasFeeCap = newGasFeeCapInt
	}

	if transactOpts.GasTipCap != nil {
		newGasTipCap := new(big.Float).Mul(
			new(big.Float).SetInt(transactOpts.GasTipCap),
			big.NewFloat(multiplier),
		)
		newGasTipCapInt, _ := newGasTipCap.Int(nil)
		transactOpts.GasTipCap = newGasTipCapInt
	}

	executor.logger.Debug(fmt.Sprintf("Updated gas prices for retry %d: MaxFee=%s, Priority=%s",
		attempt,
		transactOpts.GasFeeCap.String(),
		transactOpts.GasTipCap.String()))

	return transactOpts, nil
}

// updateExecutionStats updates execution statistics
func (executor *FlashSwapExecutor) updateExecutionStats(result *ExecutionResult) {
	executor.executionHistory = append(executor.executionHistory, result)

	if result.Success && result.ProfitRealized != nil {
		profitDecimal, _ := math.NewUniversalDecimal(result.ProfitRealized, 18, "ETH")
		executor.totalProfit, _ = executor.decimalConverter.Add(executor.totalProfit, profitDecimal)
	}

	if result.GasCost != nil {
		executor.totalGasCost, _ = executor.decimalConverter.Add(executor.totalGasCost, result.GasCost)
	}

	// Clean up pending executions
	delete(executor.pendingExecutions, result.TransactionHash)

	// Keep only last 100 execution results
	if len(executor.executionHistory) > 100 {
		executor.executionHistory = executor.executionHistory[len(executor.executionHistory)-100:]
	}
}

// GetExecutionStats returns execution statistics
func (executor *FlashSwapExecutor) GetExecutionStats() ExecutionStats {
	successCount := 0
	totalExecutions := len(executor.executionHistory)

	for _, result := range executor.executionHistory {
		if result.Success {
			successCount++
		}
	}

	successRate := 0.0
	if totalExecutions > 0 {
		successRate = float64(successCount) / float64(totalExecutions) * 100
	}

	return ExecutionStats{
		TotalExecutions:      totalExecutions,
		SuccessfulExecutions: successCount,
		SuccessRate:          successRate,
		TotalProfit:          executor.totalProfit,
		TotalGasCost:         executor.totalGasCost,
		PendingExecutions:    len(executor.pendingExecutions),
	}
}

// ExecutionStats contains execution statistics
type ExecutionStats struct {
	TotalExecutions      int
	SuccessfulExecutions int
	SuccessRate          float64
	TotalProfit          *math.UniversalDecimal
	TotalGasCost         *math.UniversalDecimal
	PendingExecutions    int
}

// GetPendingExecutions returns currently pending executions
func (executor *FlashSwapExecutor) GetPendingExecutions() map[common.Hash]*ExecutionState {
	return executor.pendingExecutions
}

// GetExecutionHistory returns recent execution history
func (executor *FlashSwapExecutor) GetExecutionHistory(limit int) []*ExecutionResult {
	if limit <= 0 || limit > len(executor.executionHistory) {
		limit = len(executor.executionHistory)
	}

	start := len(executor.executionHistory) - limit
	return executor.executionHistory[start:]
}