mev-beta/pkg/scanner/market/scanner.go

package market

import (
	"context"
	"errors"
	"fmt"
	"math/big"
	"os"
	"strings"
	"sync"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/ethclient"
	"github.com/holiman/uint256"
	"golang.org/x/sync/singleflight"

	"github.com/fraktal/mev-beta/internal/config"
	"github.com/fraktal/mev-beta/internal/logger"
	"github.com/fraktal/mev-beta/internal/tokens"
	"github.com/fraktal/mev-beta/internal/validation"
	"github.com/fraktal/mev-beta/pkg/circuit"
	"github.com/fraktal/mev-beta/pkg/contracts"
	"github.com/fraktal/mev-beta/pkg/database"
	"github.com/fraktal/mev-beta/pkg/events"
	"github.com/fraktal/mev-beta/pkg/marketdata"
	"github.com/fraktal/mev-beta/pkg/pools"
	"github.com/fraktal/mev-beta/pkg/profitcalc"
	"github.com/fraktal/mev-beta/pkg/trading"
	stypes "github.com/fraktal/mev-beta/pkg/types"
	"github.com/fraktal/mev-beta/pkg/uniswap"
)

// safeConvertInt64ToUint64 safely converts an int64 to uint64, ensuring no negative values
func safeConvertInt64ToUint64(v int64) uint64 {
	if v < 0 {
		return 0
	}
	return uint64(v)
}

// MarketScanner scans markets for price movement opportunities with concurrency
type MarketScanner struct {
	config            *config.BotConfig
	logger            *logger.Logger
	workerPool        chan chan events.Event
	workers           []*EventWorker
	wg                sync.WaitGroup
	cacheGroup        singleflight.Group
	cache             map[string]*CachedData
	cacheMutex        sync.RWMutex
	cacheTTL          time.Duration
	slippageProtector *trading.SlippageProtection
	circuitBreaker    *circuit.CircuitBreaker
	contractExecutor  *contracts.ContractExecutor
	create2Calculator *pools.CREATE2Calculator
	database          *database.Database
	profitCalculator  *profitcalc.ProfitCalculator
	opportunityRanker *profitcalc.OpportunityRanker
	marketDataLogger  *marketdata.MarketDataLogger // Enhanced market data logging system
	addressValidator  *validation.AddressValidator
	poolBlacklist     map[common.Address]BlacklistReason // Pools that consistently fail RPC calls
	blacklistMutex    sync.RWMutex
}

// BlacklistReason contains information about why a pool was blacklisted
type BlacklistReason struct {
	Reason      string
	FailCount   int
	LastFailure time.Time
	AddedAt     time.Time
}

// ErrInvalidPoolCandidate is returned when a pool address fails pre-validation
// checks and should not be fetched from the RPC endpoint.
var ErrInvalidPoolCandidate = errors.New("invalid pool candidate")

// EventWorker represents a worker that processes event details
type EventWorker struct {
	ID         int
	WorkerPool chan chan events.Event
	JobChannel chan events.Event
	QuitChan   chan bool
	scanner    *MarketScanner
}

// NewMarketScanner creates a new market scanner with concurrency support
func NewMarketScanner(cfg *config.BotConfig, logger *logger.Logger, contractExecutor *contracts.ContractExecutor, db *database.Database) *MarketScanner {
	var ethClient *ethclient.Client
	if contractExecutor != nil {
		ethClient = contractExecutor.GetClient()
	}

	var slippageProtector *trading.SlippageProtection
	if ethClient != nil {
		slippageProtector = trading.NewSlippageProtection(ethClient, logger)
	}

	var profitCalculator *profitcalc.ProfitCalculator
	if ethClient != nil {
		profitCalculator = profitcalc.NewProfitCalculatorWithClient(logger, ethClient)
	} else {
		profitCalculator = profitcalc.NewProfitCalculator(logger)
	}

	create2Calculator := pools.NewCREATE2Calculator(logger, ethClient)
	if ethClient == nil {
		logger.Debug("CREATE2 calculator initialized without Ethereum client; live pool discovery limited")
	}

	marketDataLogger := marketdata.NewMarketDataLogger(logger, db)

	addressValidator := validation.NewAddressValidator()
	addressValidator.InitializeKnownContracts()

	scanner := &MarketScanner{
		config:            cfg,
		logger:            logger,
		workerPool:        make(chan chan events.Event, cfg.MaxWorkers),
		workers:           make([]*EventWorker, 0, cfg.MaxWorkers),
		cache:             make(map[string]*CachedData),
		cacheTTL:          time.Duration(cfg.RPCTimeout) * time.Second,
		slippageProtector: slippageProtector,
		circuitBreaker: circuit.NewCircuitBreaker(&circuit.Config{
			Logger:           logger,
			Name:             "market_scanner",
			MaxFailures:      10,
			ResetTimeout:     time.Minute * 5,
			MaxRequests:      3,
			SuccessThreshold: 2,
		}),
		contractExecutor:  contractExecutor,
		create2Calculator: create2Calculator,
		database:          db,
		profitCalculator:  profitCalculator,
		opportunityRanker: profitcalc.NewOpportunityRanker(logger),
		marketDataLogger:  marketDataLogger,
		addressValidator:  addressValidator,
		poolBlacklist:     make(map[common.Address]BlacklistReason),
	}

	// Initialize pool blacklist with known failing pools
	scanner.initializePoolBlacklist()

	// Initialize market data logger
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()
	if scanner.marketDataLogger != nil {
		if err := scanner.marketDataLogger.Initialize(ctx); err != nil {
			logger.Warn(fmt.Sprintf("Failed to initialize market data logger: %v", err))
		}
	} else {
		logger.Warn("Market data logger disabled: database not configured")
	}

	// Create workers
	for i := 0; i < cfg.MaxWorkers; i++ {
		worker := NewEventWorker(i, scanner.workerPool, scanner)
		scanner.workers = append(scanner.workers, worker)
		worker.Start()
	}

	// Start cache cleanup routine
	go scanner.cleanupCache()

	return scanner
}

// NewEventWorker creates a new event worker
func NewEventWorker(id int, workerPool chan chan events.Event, scanner *MarketScanner) *EventWorker {
	return &EventWorker{
		ID:         id,
		WorkerPool: workerPool,
		JobChannel: make(chan events.Event),
		QuitChan:   make(chan bool),
		scanner:    scanner,
	}
}

// Start begins the worker
func (w *EventWorker) Start() {
	go func() {
		for {
			// Register the worker in the worker pool
			w.WorkerPool <- w.JobChannel

			select {
			case job := <-w.JobChannel:
				// Process the job
				w.Process(job)
			case <-w.QuitChan:
				// Stop the worker
				return
			}
		}
	}()
}

// Stop terminates the worker
func (w *EventWorker) Stop() {
	go func() {
		w.QuitChan <- true
	}()
}

// Process handles an event detail
func (w *EventWorker) Process(event events.Event) {
	// Analyze the event in a separate goroutine to maintain throughput
	go func() {
		defer w.scanner.wg.Done()

		// Log the processing
		w.scanner.logger.Debug(fmt.Sprintf("Worker %d processing %s event in pool %s from protocol %s",
			w.ID, event.Type.String(), event.PoolAddress, event.Protocol))

		// Analyze based on event type
		switch event.Type {
		case events.Swap:
			w.scanner.LogSwapEvent(event)
		case events.AddLiquidity:
			w.scanner.LogLiquidityEvent(event, "add")
		case events.RemoveLiquidity:
			w.scanner.LogLiquidityEvent(event, "remove")
		case events.NewPool:
			w.scanner.logger.Info(fmt.Sprintf("Worker %d detected new pool: %s", w.ID, event.PoolAddress.Hex()))
		default:
			w.scanner.logger.Debug(fmt.Sprintf("Worker %d received unknown event type: %d", w.ID, event.Type))
		}
	}()
}

// SubmitEvent submits an event for processing by the worker pool
func (s *MarketScanner) SubmitEvent(event events.Event) {
	s.wg.Add(1)

	// CRITICAL FIX: Populate token addresses if they're missing (zero addresses)
	// This fixes the issue where events are logged with 0x00000000 token addresses
	zeroAddr := common.Address{}
	if event.Token0 == zeroAddr || event.Token1 == zeroAddr {
		// Try to get token addresses from cache first
		s.cacheMutex.RLock()
		poolKey := event.PoolAddress.Hex()
		if cachedPool, exists := s.cache[poolKey]; exists {
			event.Token0 = cachedPool.Token0
			event.Token1 = cachedPool.Token1
			s.logger.Debug(fmt.Sprintf("✅ Enriched event with cached tokens: %s ↔ %s for pool %s",
				event.Token0.Hex()[:10], event.Token1.Hex()[:10], poolKey[:10]))
		} else {
			s.cacheMutex.RUnlock()
			// Cache miss - fetch pool data to get token addresses
			poolData, err := s.fetchPoolData(poolKey)
			if err == nil {
				event.Token0 = poolData.Token0
				event.Token1 = poolData.Token1
				s.logger.Debug(fmt.Sprintf("✅ Enriched event with fetched tokens: %s ↔ %s for pool %s",
					event.Token0.Hex()[:10], event.Token1.Hex()[:10], poolKey[:10]))
			} else {
				s.logger.Debug(fmt.Sprintf("⚠️ Could not fetch tokens for pool %s: %v", poolKey[:10], err))
			}
			s.cacheMutex.RLock()
		}
		s.cacheMutex.RUnlock()
	}

	// Get an available worker job channel
	jobChannel := <-s.workerPool

	// Send the job to the worker
	jobChannel <- event
}

// GetTopOpportunities returns the top ranked arbitrage opportunities
func (s *MarketScanner) GetTopOpportunities(limit int) []*profitcalc.RankedOpportunity {
	return s.opportunityRanker.GetTopOpportunities(limit)
}

// GetExecutableOpportunities returns executable arbitrage opportunities
func (s *MarketScanner) GetExecutableOpportunities(limit int) []*profitcalc.RankedOpportunity {
	return s.opportunityRanker.GetExecutableOpportunities(limit)
}

// GetOpportunityStats returns statistics about tracked opportunities
func (s *MarketScanner) GetOpportunityStats() map[string]interface{} {
	return s.opportunityRanker.GetStats()
}

// GetMarketDataStats returns comprehensive market data statistics
func (s *MarketScanner) GetMarketDataStats() map[string]interface{} {
	if s.marketDataLogger != nil {
		return s.marketDataLogger.GetStatistics()
	}
	return map[string]interface{}{
		"status": "market data logger not available",
	}
}

// GetCachedTokenInfo returns information about a cached token
func (s *MarketScanner) GetCachedTokenInfo(tokenAddr common.Address) (*marketdata.TokenInfo, bool) {
	if s.marketDataLogger != nil {
		return s.marketDataLogger.GetTokenInfo(tokenAddr)
	}
	return nil, false
}

// GetCachedPoolInfo returns information about a cached pool
func (s *MarketScanner) GetCachedPoolInfo(poolAddr common.Address) (*marketdata.PoolInfo, bool) {
	if s.marketDataLogger != nil {
		return s.marketDataLogger.GetPoolInfo(poolAddr)
	}
	return nil, false
}

// GetPoolsForTokenPair returns all cached pools for a token pair
func (s *MarketScanner) GetPoolsForTokenPair(token0, token1 common.Address) []*marketdata.PoolInfo {
	if s.marketDataLogger != nil {
		return s.marketDataLogger.GetPoolsForTokenPair(token0, token1)
	}
	return nil
}

// GetActiveFactories returns all active DEX factories
func (s *MarketScanner) GetActiveFactories() []*marketdata.FactoryInfo {
	if s.marketDataLogger != nil {
		return s.marketDataLogger.GetActiveFactories()
	}
	return nil
}

// isSignificantMovement determines if a price movement is significant enough to exploit
func (s *MarketScanner) isSignificantMovement(movement *PriceMovement, threshold float64) bool {
	// Check if the price impact is above our threshold
	if movement.PriceImpact > threshold {
		return true
	}

	// Also check if the absolute amount is significant
	if movement.AmountIn != nil && movement.AmountIn.Cmp(big.NewInt(1000000000000000000)) > 0 { // 1 ETH
		return true
	}

	// For smaller amounts, we need a higher price impact to be significant
	if movement.AmountIn != nil && movement.AmountIn.Cmp(big.NewInt(100000000000000000)) > 0 { // 0.1 ETH
		return movement.PriceImpact > threshold/2
	}

	return false
}

// findRelatedPools finds pools that trade the same token pair
func (s *MarketScanner) findRelatedPools(token0, token1 common.Address) []*CachedData {
	s.logger.Debug(fmt.Sprintf("Finding related pools for token pair %s-%s", token0.Hex(), token1.Hex()))

	relatedPools := make([]*CachedData, 0)

	// Use dynamic pool discovery by checking known DEX factories
	poolAddresses := s.discoverPoolsForPair(token0, token1)

	s.logger.Debug(fmt.Sprintf("Found %d potential pools for pair %s-%s", len(poolAddresses), token0.Hex(), token1.Hex()))

	for _, poolAddr := range poolAddresses {
		poolData, err := s.getPoolData(poolAddr)
		if err != nil {
			s.logger.Debug(fmt.Sprintf("No data for pool %s: %v", poolAddr, err))
			continue
		}

		// Check if this pool trades the same token pair (in either direction)
		if (poolData.Token0 == token0 && poolData.Token1 == token1) ||
			(poolData.Token0 == token1 && poolData.Token1 == token0) {
			relatedPools = append(relatedPools, poolData)
		}
	}

	s.logger.Debug(fmt.Sprintf("Found %d related pools", len(relatedPools)))
	return relatedPools
}

// discoverPoolsForPair discovers pools for a specific token pair using real factory contracts
func (s *MarketScanner) discoverPoolsForPair(token0, token1 common.Address) []string {
	poolAddresses := make([]string, 0)

	if s.create2Calculator == nil {
		s.logger.Debug("CREATE2 calculator unavailable; skipping pool discovery")
		return poolAddresses
	}

	// Use the CREATE2 calculator to find all possible pools
	pools, err := s.create2Calculator.FindPoolsForTokenPair(token0, token1)
	if err != nil {
		s.logger.Error(fmt.Sprintf("Failed to discover pools for pair %s/%s: %v", token0.Hex(), token1.Hex(), err))
		return poolAddresses
	}

	// Convert to string addresses
	for _, pool := range pools {
		poolAddresses = append(poolAddresses, pool.PoolAddr.Hex())
	}

	s.logger.Debug(fmt.Sprintf("Discovered %d potential pools for pair %s/%s", len(poolAddresses), token0.Hex(), token1.Hex()))
	return poolAddresses
}

// estimateProfit estimates the potential profit from an arbitrage opportunity using real slippage protection
func (s *MarketScanner) estimateProfit(event events.Event, pool *CachedData, priceDiff float64) *big.Int {
	// Use comprehensive slippage analysis instead of simplified calculation
	if s.slippageProtector != nil {
		return s.calculateProfitWithSlippageProtection(event, pool, priceDiff)
	}

	// Fallback to simplified calculation if slippage protection not available
	return s.calculateSophisticatedProfit(event, pool, priceDiff)
}

// calculateProfitWithSlippageProtection uses slippage protection for accurate profit estimation
func (s *MarketScanner) calculateProfitWithSlippageProtection(event events.Event, pool *CachedData, priceDiff float64) *big.Int {
	// Create trade parameters from event data
	tradeParams := &trading.TradeParameters{
		TokenIn:          event.Token0,
		TokenOut:         event.Token1,
		AmountIn:         event.Amount0,
		MinAmountOut:     new(big.Int).Div(event.Amount1, big.NewInt(100)), // Simplified min amount
		MaxSlippage:      3.0,                                              // 3% max slippage
		Deadline:         safeConvertInt64ToUint64(time.Now().Add(5 * time.Minute).Unix()),
		Pool:             event.PoolAddress,
		ExpectedPrice:    big.NewFloat(1.0),   // Simplified expected price
		CurrentLiquidity: big.NewInt(1000000), // Simplified liquidity
	}

	// Analyze slippage protection
	slippageCheck, err := s.slippageProtector.ValidateTradeParameters(tradeParams)
	if err != nil {
		s.logger.Debug(fmt.Sprintf("Slippage analysis failed: %v", err))
		return s.calculateSophisticatedProfit(event, pool, priceDiff)
	}

	// Don't proceed if trade is not safe
	if !slippageCheck.IsValid {
		s.logger.Debug("Trade rejected by slippage protection")
		return big.NewInt(0)
	}

	// Calculate profit considering slippage
	expectedAmountOut := event.Amount1

	// Profit = (expected_out - amount_in) - gas_costs - slippage_buffer
	profit := new(big.Int).Sub(expectedAmountOut, event.Amount0)

	// REAL gas cost calculation for competitive MEV on Arbitrum
	// Base gas: 800k units, Price: 1.5 gwei, MEV premium: 15x = 0.018 ETH total
	baseGas := big.NewInt(800000)      // 800k gas units for flash swap arbitrage
	gasPrice := big.NewInt(1500000000) // 1.5 gwei base price on Arbitrum
	mevPremium := big.NewInt(15)       // 15x premium for MEV competition

	gasCostWei := new(big.Int).Mul(baseGas, gasPrice)
	totalGasCost := new(big.Int).Mul(gasCostWei, mevPremium)

	profit.Sub(profit, totalGasCost)

	// Apply safety margin for slippage
	if slippageCheck.CalculatedSlippage > 0 {
		slippageMarginFloat := slippageCheck.CalculatedSlippage / 100.0
		slippageMargin := new(big.Float).Mul(new(big.Float).SetInt(expectedAmountOut), big.NewFloat(slippageMarginFloat))
		slippageMarginInt, _ := slippageMargin.Int(nil)
		profit.Sub(profit, slippageMarginInt)
	}

	// Ensure profit is not negative
	if profit.Sign() < 0 {
		return big.NewInt(0)
	}

	return profit
}

// calculateSophisticatedProfit provides advanced profit calculation with MEV considerations
func (s *MarketScanner) calculateSophisticatedProfit(event events.Event, pool *CachedData, priceDiff float64) *big.Int {
	amountIn := new(big.Int).Set(event.Amount0)

	// Use sophisticated pricing calculation based on Uniswap V3 concentrated liquidity
	var amountOut *big.Int
	var err error

	if pool.SqrtPriceX96 != nil && pool.Liquidity != nil {
		// Calculate output using proper Uniswap V3 math
		amountOut, err = s.calculateUniswapV3Output(amountIn, pool)
		if err != nil {
			s.logger.Debug(fmt.Sprintf("Failed to calculate V3 output, using fallback: %v", err))
			amountOut = s.calculateFallbackOutput(amountIn, priceDiff)
		}
	} else {
		amountOut = s.calculateFallbackOutput(amountIn, priceDiff)
	}

	// Calculate arbitrage profit considering market impact
	marketImpact := s.calculateMarketImpact(amountIn, pool)
	adjustedAmountOut := new(big.Int).Sub(amountOut, marketImpact)

	// Calculate gross profit
	grossProfit := new(big.Int).Sub(adjustedAmountOut, amountIn)

	// Sophisticated gas cost calculation
	gasCost := s.calculateDynamicGasCost(event, pool)

	// MEV competition premium (front-running protection cost)
	mevPremium := s.calculateMEVPremium(grossProfit, priceDiff)

	// Calculate net profit after all costs
	netProfit := new(big.Int).Sub(grossProfit, gasCost)
	netProfit = netProfit.Sub(netProfit, mevPremium)

	// Apply slippage tolerance
	slippageTolerance := s.calculateSlippageTolerance(amountIn, pool)
	finalProfit := new(big.Int).Sub(netProfit, slippageTolerance)

	// Ensure profit is positive and meets minimum threshold
	minProfitThreshold := big.NewInt(1000000000000000000) // 1 ETH minimum
	if finalProfit.Cmp(minProfitThreshold) < 0 {
		return big.NewInt(0)
	}

	s.logger.Debug(fmt.Sprintf("Sophisticated profit calculation: gross=%s, gas=%s, mev=%s, slippage=%s, net=%s",
		grossProfit.String(), gasCost.String(), mevPremium.String(), slippageTolerance.String(), finalProfit.String()))

	return finalProfit
}

// findTriangularArbitrageOpportunities looks for triangular arbitrage opportunities
func (s *MarketScanner) findTriangularArbitrageOpportunities(event events.Event) []stypes.ArbitrageOpportunity {
	s.logger.Debug(fmt.Sprintf("Searching for triangular arbitrage opportunities involving pool %s", event.PoolAddress))

	opportunities := make([]stypes.ArbitrageOpportunity, 0)

	// Define common triangular paths on Arbitrum
	// Get triangular arbitrage paths from token configuration
	triangularPaths := tokens.GetTriangularPaths()

	// Check if the event involves any tokens from our triangular paths
	eventInvolvesPaths := make([]int, 0)
	for i, path := range triangularPaths {
		for _, token := range path.Tokens {
			if token == event.Token0 || token == event.Token1 {
				eventInvolvesPaths = append(eventInvolvesPaths, i)
				break
			}
		}
	}

	// For each relevant triangular path, calculate potential profit
	for _, pathIdx := range eventInvolvesPaths {
		path := triangularPaths[pathIdx]

		// Define test amounts for arbitrage calculation
		testAmounts := []*big.Int{
			big.NewInt(1000000),   // 1 USDC (6 decimals)
			big.NewInt(100000000), // 0.1 WETH (18 decimals)
			big.NewInt(10000000),  // 0.01 WETH (18 decimals)
		}

		for _, testAmount := range testAmounts {
			profit, gasEstimate, err := s.calculateTriangularProfit(path.Tokens, testAmount)
			if err != nil {
				s.logger.Debug(fmt.Sprintf("Error calculating triangular profit for %s: %v", path.Name, err))
				continue
			}

			// Check if profitable after gas costs
			netProfit := new(big.Int).Sub(profit, gasEstimate)
			if netProfit.Sign() > 0 {
				// Calculate ROI
				roi := 0.0
				if testAmount.Sign() > 0 {
					roiFloat := new(big.Float).Quo(new(big.Float).SetInt(netProfit), new(big.Float).SetInt(testAmount))
					roi, _ = roiFloat.Float64()
					roi *= 100 // Convert to percentage
				}

				// Create arbitrage opportunity
				tokenPaths := make([]string, len(path.Tokens))
				for i, token := range path.Tokens {
					tokenPaths[i] = token.Hex()
				}
				// Close the loop by adding the first token at the end
				tokenPaths = append(tokenPaths, path.Tokens[0].Hex())

				// Properly initialize all required fields
				now := time.Now()
				opportunity := stypes.ArbitrageOpportunity{
					ID:              fmt.Sprintf("arb_%d_%s", now.Unix(), path.Tokens[0].Hex()[:10]),
					Path:            tokenPaths,
					Pools:           []string{}, // Pool addresses will be discovered dynamically
					AmountIn:        testAmount,
					Profit:          profit,
					NetProfit:       netProfit,
					GasEstimate:     gasEstimate,
					GasCost:         gasEstimate, // Set gas cost same as estimate
					EstimatedProfit: netProfit,
					RequiredAmount:  testAmount,
					ROI:             roi,
					Protocol:        fmt.Sprintf("Triangular_%s", path.Name),
					ExecutionTime:   500, // Estimated 500ms for triangular arb
					Confidence:      0.5, // Medium confidence for triangular
					PriceImpact:     0.0, // Will be calculated dynamically
					MaxSlippage:     2.0, // 2% max slippage
					TokenIn:         path.Tokens[0],
					TokenOut:        path.Tokens[0], // Circular, starts and ends with same token
					Timestamp:       now.Unix(),
					DetectedAt:      now,
					ExpiresAt:       now.Add(5 * time.Second), // 5 second expiry
					Urgency:         5,                        // Medium urgency
					Risk:            0.3,                      // Low-medium risk
					Profitable:      netProfit.Sign() > 0,
				}

				opportunities = append(opportunities, opportunity)
				s.logger.Info(fmt.Sprintf("Found triangular arbitrage opportunity: %s, Profit: %s, ROI: %.2f%%",
					path.Name, netProfit.String(), roi))
			}
		}
	}

	return opportunities
}

// calculateTriangularProfit calculates the profit from a triangular arbitrage path
func (s *MarketScanner) calculateTriangularProfit(tokens []common.Address, initialAmount *big.Int) (*big.Int, *big.Int, error) {
	if len(tokens) < 3 {
		return nil, nil, fmt.Errorf("triangular arbitrage requires at least 3 tokens")
	}

	currentAmount := new(big.Int).Set(initialAmount)
	totalGasCost := big.NewInt(0)

	// Simulate trading through the triangular path
	for i := 0; i < len(tokens); i++ {
		nextIndex := (i + 1) % len(tokens)
		tokenIn := tokens[i]
		tokenOut := tokens[nextIndex]

		// Get pools that trade this token pair
		relatedPools := s.findRelatedPools(tokenIn, tokenOut)
		if len(relatedPools) == 0 {
			// No pools found for this pair, use estimation
			// Apply a 0.3% fee reduction as approximation
			currentAmount = new(big.Int).Mul(currentAmount, big.NewInt(997))
			currentAmount = new(big.Int).Div(currentAmount, big.NewInt(1000))
		} else {
			// Use the best pool for this trade
			bestPool := relatedPools[0]

			// Calculate swap output using current amount
			outputAmount, err := s.calculateSwapOutput(currentAmount, bestPool, tokenIn, tokenOut)
			if err != nil {
				s.logger.Debug(fmt.Sprintf("Error calculating swap output: %v", err))
				// Fallback to simple fee calculation
				currentAmount = new(big.Int).Mul(currentAmount, big.NewInt(997))
				currentAmount = new(big.Int).Div(currentAmount, big.NewInt(1000))
			} else {
				currentAmount = outputAmount
			}
		}

		// Add gas cost for this hop (estimated)
		hopGasUnits := big.NewInt(150000) // ~150k gas units per swap
		totalGasCost.Add(totalGasCost, hopGasUnits)
	}

	// FIXED: Convert gas units to wei (gas units * gas price)
	// Use 0.1 gwei (100000000 wei) as conservative gas price estimate
	gasPrice := big.NewInt(100000000) // 0.1 gwei in wei
	totalGasCostWei := new(big.Int).Mul(totalGasCost, gasPrice)

	// Calculate profit (final amount - initial amount)
	profit := new(big.Int).Sub(currentAmount, initialAmount)

	return profit, totalGasCostWei, nil
}

// calculateSwapOutput calculates the output amount for a token swap
func (s *MarketScanner) calculateSwapOutput(amountIn *big.Int, pool *CachedData, tokenIn, tokenOut common.Address) (*big.Int, error) {
	if pool.SqrtPriceX96 == nil || pool.Liquidity == nil {
		return nil, fmt.Errorf("missing pool price or liquidity data")
	}

	// Convert sqrtPriceX96 to price for calculation
	price := uniswap.SqrtPriceX96ToPriceCached(pool.SqrtPriceX96.ToBig())

	// Use sophisticated Uniswap V3 concentrated liquidity calculation
	var amountOut *big.Int
	var err error

	// Try sophisticated V3 calculation first
	amountOut, err = s.calculateUniswapV3Output(amountIn, pool)
	if err != nil {
		s.logger.Debug(fmt.Sprintf("V3 calculation failed, using price-based fallback: %v", err))

		// Fallback to price-based calculation with proper fee handling
		amountInFloat := new(big.Float).SetInt(amountIn)
		var amountOutFloat *big.Float

		if tokenIn == pool.Token0 {
			// Token0 -> Token1: multiply by price
			amountOutFloat = new(big.Float).Mul(amountInFloat, price)
		} else {
			// Token1 -> Token0: divide by price
			amountOutFloat = new(big.Float).Quo(amountInFloat, price)
		}

		// Apply dynamic fee based on pool configuration
		fee := pool.Fee
		if fee == 0 {
			fee = 3000 // Default 0.3%
		}

		// Calculate precise fee rate
		feeRateFloat := big.NewFloat(1.0)
		feeRateFloat.Sub(feeRateFloat, new(big.Float).Quo(big.NewFloat(float64(fee)), big.NewFloat(1000000)))
		amountOutFloat.Mul(amountOutFloat, feeRateFloat)

		// Convert back to big.Int
		amountOut = new(big.Int)
		amountOutFloat.Int(amountOut)
	}

	s.logger.Debug(fmt.Sprintf("Swap calculation: amountIn=%s, amountOut=%s, tokenIn=%s, tokenOut=%s",
		amountIn.String(), amountOut.String(), tokenIn.Hex(), tokenOut.Hex()))

	return amountOut, nil
}

// executeArbitrageOpportunity executes an arbitrage opportunity using the smart contract
func (s *MarketScanner) executeArbitrageOpportunity(opportunity stypes.ArbitrageOpportunity) {
	// Check if contract executor is available
	if s.contractExecutor == nil {
		s.logger.Warn("Contract executor not available, skipping arbitrage execution")
		return
	}

	// Only execute opportunities with sufficient profit
	// AGGRESSIVE THRESHOLD: Lowered to match arbitrum_production.yaml settings (0.00001 ETH / $0.02)
	minProfitThreshold := big.NewInt(10000000000000) // 0.00001 ETH minimum profit - VERY AGGRESSIVE
	if opportunity.Profit.Cmp(minProfitThreshold) < 0 {
		s.logger.Debug(fmt.Sprintf("Arbitrage opportunity profit too low: %s < %s (%.6f ETH)",
			opportunity.Profit.String(), minProfitThreshold.String(), float64(opportunity.Profit.Int64())/1e18))
		return
	}

	s.logger.Info(fmt.Sprintf("✅ PROFITABLE OPPORTUNITY FOUND! Profit: %.6f ETH (%.2f USD @ $2000/ETH)",
		float64(opportunity.Profit.Int64())/1e18, float64(opportunity.Profit.Int64())*2000/1e18))

	s.logger.Info(fmt.Sprintf("Executing arbitrage opportunity with profit: %s", opportunity.Profit.String()))

	// Execute the arbitrage opportunity
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	var tx *types.Transaction
	var err error

	// Determine if this is a triangular arbitrage or standard arbitrage
	if len(opportunity.Path) == 3 && len(opportunity.Pools) == 3 {
		// Triangular arbitrage
		tx, err = s.contractExecutor.ExecuteTriangularArbitrage(ctx, opportunity)
	} else {
		// Standard arbitrage
		tx, err = s.contractExecutor.ExecuteArbitrage(ctx, opportunity)
	}

	if err != nil {
		s.logger.Error(fmt.Sprintf("Failed to execute arbitrage opportunity: %v", err))
		return
	}

	s.logger.Info(fmt.Sprintf("Arbitrage transaction submitted: %s", tx.Hash().Hex()))
}

// logSwapEvent logs a swap event to the database
func (s *MarketScanner) logSwapEvent(event events.Event) {
	if s.database == nil {
		return // Database not available
	}

	// Convert event to database record
	swapEvent := &database.SwapEvent{
		Timestamp:   time.Now(),
		BlockNumber: event.BlockNumber,
		TxHash:      common.Hash{}, // TxHash not available in Event struct
		PoolAddress: event.PoolAddress,
		Token0:      event.Token0,
		Token1:      event.Token1,
		Amount0In:   event.Amount0,
		Amount1In:   event.Amount1,
		Amount0Out:  big.NewInt(0),    // Would need to calculate from event data
		Amount1Out:  big.NewInt(0),    // Would need to calculate from event data
		Sender:      common.Address{}, // Would need to extract from transaction
		Recipient:   common.Address{}, // Would need to extract from transaction
		Protocol:    event.Protocol,
	}

	// Log the swap event asynchronously to avoid blocking
	go func() {
		if err := s.database.InsertSwapEvent(swapEvent); err != nil {
			s.logger.Debug(fmt.Sprintf("Failed to log swap event: %v", err))
		}
	}()
}

// logLiquidityEvent logs a liquidity event to the database
func (s *MarketScanner) logLiquidityEvent(event events.Event, eventType string) {
	if s.database == nil {
		return // Database not available
	}

	// Convert event to database record
	liquidityEvent := &database.LiquidityEvent{
		Timestamp:   time.Now(),
		BlockNumber: event.BlockNumber,
		TxHash:      common.Hash{}, // TxHash not available in Event struct
		LogIndex:    uint(0),       // Default log index (would need to be extracted from receipt)
		PoolAddress: event.PoolAddress,
		Factory:     s.getFactoryForProtocol(event.Protocol),
		Router:      common.Address{}, // Would need router resolution based on transaction
		Token0:      event.Token0,
		Token1:      event.Token1,
		Liquidity:   event.Liquidity.ToBig(), // Convert uint256 to big.Int
		Amount0:     event.Amount0,
		Amount1:     event.Amount1,
		TokenId:     big.NewInt(0),    // Default token ID for V3 positions
		TickLower:   int32(0),         // Default tick range
		TickUpper:   int32(0),         // Default tick range
		Owner:       common.Address{}, // Would need to extract from transaction
		Recipient:   common.Address{}, // Would need to extract from transaction
		EventType:   eventType,
		Protocol:    event.Protocol,
		Amount0USD:  0.0, // Will be calculated by market data logger
		Amount1USD:  0.0, // Will be calculated by market data logger
		TotalUSD:    0.0, // Will be calculated by market data logger
	}

	// Log the liquidity event asynchronously to avoid blocking
	go func() {
		if err := s.database.InsertLiquidityEvent(liquidityEvent); err != nil {
			s.logger.Debug(fmt.Sprintf("Failed to log liquidity event: %v", err))
		}
	}()
}

// logPoolData logs pool data to the database
func (s *MarketScanner) logPoolData(poolData *CachedData) {
	if s.database == nil {
		return // Database not available
	}

	// Convert cached data to database record
	dbPoolData := &database.PoolData{
		Address:      poolData.Address,
		Token0:       poolData.Token0,
		Token1:       poolData.Token1,
		Fee:          poolData.Fee,
		Liquidity:    poolData.Liquidity.ToBig(),
		SqrtPriceX96: poolData.SqrtPriceX96.ToBig(),
		Tick:         int64(poolData.Tick),
		LastUpdated:  time.Now(),
		Protocol:     poolData.Protocol,
	}

	// Log the pool data asynchronously to avoid blocking
	go func() {
		if err := s.database.InsertPoolData(dbPoolData); err != nil {
			s.logger.Debug(fmt.Sprintf("Failed to log pool data: %v", err))
		}
	}()
}

// PriceMovement represents a potential price movement
type PriceMovement struct {
	Token0      string     // Token address
	Token1      string     // Token address
	Pool        string     // Pool address
	Protocol    string     // DEX protocol
	AmountIn    *big.Int   // Amount of token being swapped in
	AmountOut   *big.Int   // Amount of token being swapped out
	PriceBefore *big.Float // Price before the swap
	PriceAfter  *big.Float // Price after the swap (to be calculated)
	PriceImpact float64    // Calculated price impact
	TickBefore  int        // Tick before the swap
	TickAfter   int        // Tick after the swap (to be calculated)
	Timestamp   time.Time  // Event timestamp
}

// CachedData represents cached pool data
type CachedData struct {
	Address      common.Address
	Token0       common.Address
	Token1       common.Address
	Fee          int64
	Liquidity    *uint256.Int
	SqrtPriceX96 *uint256.Int
	Tick         int
	TickSpacing  int
	LastUpdated  time.Time
	Protocol     string
}

// normalizeAndValidatePoolAddress returns a canonical representation of the
// pool candidate and a validation result. It rejects obviously corrupted
// addresses and known non-pool contracts before any RPC work is attempted.
func (s *MarketScanner) normalizeAndValidatePoolAddress(candidate string) (string, *validation.AddressValidationResult, error) {
	if s.addressValidator == nil {
		trimmed := strings.TrimSpace(candidate)
		return trimmed, nil, nil
	}

	trimmed := strings.TrimSpace(candidate)
	if trimmed == "" {
		return "", nil, fmt.Errorf("%w: empty address", ErrInvalidPoolCandidate)
	}

	if !strings.HasPrefix(trimmed, "0x") && len(trimmed) == 40 {
		trimmed = "0x" + trimmed
	}

	// Lowercase for consistent cache keys and validation while preserving the
	// ability to distinguish later via validation result if needed.
	normalized := strings.ToLower(trimmed)

	result := s.addressValidator.ValidateAddress(normalized)

	if !result.IsValid || result.CorruptionScore >= 30 {
		return "", result, fmt.Errorf("%w: validation_failed", ErrInvalidPoolCandidate)
	}

	switch result.ContractType {
	case validation.ContractTypeERC20Token, validation.ContractTypeRouter, validation.ContractTypeFactory:
		return "", result, fmt.Errorf("%w: non_pool_contract", ErrInvalidPoolCandidate)
	}

	return normalized, result, nil
}

// getPoolData retrieves pool data with caching
func (s *MarketScanner) getPoolData(poolAddress string) (*CachedData, error) {
	normalized, validationResult, err := s.normalizeAndValidatePoolAddress(poolAddress)
	if err != nil {
		if errors.Is(err, ErrInvalidPoolCandidate) {
			corruptionScore := -1
			if validationResult != nil {
				corruptionScore = validationResult.CorruptionScore
			}
			contractType := ""
			if validationResult != nil {
				contractType = validationResult.ContractType.String()
			}
			s.logger.Debug("Pool candidate rejected before fetch",
				"address", poolAddress,
				"normalized", normalized,
				"error", err,
				"corruption_score", corruptionScore,
				"contract_type", contractType,
			)
		}
		return nil, err
	}

	cacheKey := fmt.Sprintf("pool_%s", normalized)

	s.cacheMutex.RLock()
	if data, exists := s.cache[cacheKey]; exists && time.Since(data.LastUpdated) < s.cacheTTL {
		s.cacheMutex.RUnlock()
		s.logger.Debug(fmt.Sprintf("Cache hit for pool %s", normalized))
		return data, nil
	}
	s.cacheMutex.RUnlock()

	// Use singleflight to prevent duplicate requests
	result, err, _ := s.cacheGroup.Do(cacheKey, func() (interface{}, error) {
		return s.fetchPoolData(normalized)
	})

	if err != nil {
		return nil, err
	}

	poolData := result.(*CachedData)

	// Update cache
	s.cacheMutex.Lock()
	s.cache[cacheKey] = poolData
	s.cacheMutex.Unlock()

	s.logger.Debug(fmt.Sprintf("Fetched and cached pool data for %s", normalized))
	return poolData, nil
}

// initializePoolBlacklist sets up the initial pool blacklist
func (s *MarketScanner) initializePoolBlacklist() {
	// Known failing pools on Arbitrum that consistently revert on slot0() calls
	knownFailingPools := []struct {
		address common.Address
		reason  string
	}{
		{
			address: common.HexToAddress("0xB1026b8e7276e7AC75410F1fcbbe21796e8f7526"),
			reason:  "slot0() consistently reverts - invalid pool contract",
		},
		// Add more known failing pools here as discovered
	}

	s.blacklistMutex.Lock()
	defer s.blacklistMutex.Unlock()

	for _, pool := range knownFailingPools {
		s.poolBlacklist[pool.address] = BlacklistReason{
			Reason:      pool.reason,
			FailCount:   0,
			LastFailure: time.Time{},
			AddedAt:     time.Now(),
		}
		s.logger.Info(fmt.Sprintf("🚫 Blacklisted pool %s: %s", pool.address.Hex(), pool.reason))
	}
}

// isPoolBlacklisted checks if a pool is in the blacklist
func (s *MarketScanner) isPoolBlacklisted(poolAddr common.Address) (bool, string) {
	s.blacklistMutex.RLock()
	defer s.blacklistMutex.RUnlock()

	if reason, exists := s.poolBlacklist[poolAddr]; exists {
		return true, reason.Reason
	}
	return false, ""
}

// addToPoolBlacklist adds a pool to the blacklist after repeated failures
func (s *MarketScanner) addToPoolBlacklist(poolAddr common.Address, reason string) {
	s.blacklistMutex.Lock()
	defer s.blacklistMutex.Unlock()

	if existing, exists := s.poolBlacklist[poolAddr]; exists {
		// Increment fail count
		existing.FailCount++
		existing.LastFailure = time.Now()
		s.poolBlacklist[poolAddr] = existing
		s.logger.Warn(fmt.Sprintf("🚫 Pool %s blacklist updated (fail count: %d): %s",
			poolAddr.Hex(), existing.FailCount, reason))
	} else {
		// New blacklist entry
		s.poolBlacklist[poolAddr] = BlacklistReason{
			Reason:      reason,
			FailCount:   1,
			LastFailure: time.Now(),
			AddedAt:     time.Now(),
		}
		s.logger.Warn(fmt.Sprintf("🚫 Pool %s added to blacklist: %s", poolAddr.Hex(), reason))
	}
}

// recordPoolFailure records a pool failure and blacklists after threshold
func (s *MarketScanner) recordPoolFailure(poolAddr common.Address, errorMsg string) {
	const failureThreshold = 5 // Blacklist after 5 consecutive failures

	s.blacklistMutex.Lock()
	defer s.blacklistMutex.Unlock()

	if existing, exists := s.poolBlacklist[poolAddr]; exists {
		// Already blacklisted, just increment counter
		existing.FailCount++
		existing.LastFailure = time.Now()
		s.poolBlacklist[poolAddr] = existing
	} else {
		// Check if we should blacklist this pool
		// Create temporary entry to track failures
		tempEntry := BlacklistReason{
			Reason:      errorMsg,
			FailCount:   1,
			LastFailure: time.Now(),
			AddedAt:     time.Now(),
		}

		// If we've seen this pool fail before (would be in cache), increment
		// For now, blacklist after first failure of specific error types
		if strings.Contains(errorMsg, "execution reverted") ||
			strings.Contains(errorMsg, "invalid pool contract") {
			s.poolBlacklist[poolAddr] = tempEntry
			s.logger.Warn(fmt.Sprintf("🚫 Pool %s blacklisted after critical error: %s",
				poolAddr.Hex(), errorMsg))
		}
	}
}

// fetchPoolData fetches pool data from the blockchain
func (s *MarketScanner) fetchPoolData(poolAddress string) (*CachedData, error) {
	s.logger.Debug(fmt.Sprintf("Fetching pool data for %s", poolAddress))

	address := common.HexToAddress(poolAddress)

	// Check blacklist before attempting expensive RPC calls
	if blacklisted, reason := s.isPoolBlacklisted(address); blacklisted {
		s.logger.Debug(fmt.Sprintf("Skipping blacklisted pool %s: %s", poolAddress, reason))
		return nil, fmt.Errorf("pool is blacklisted: %s", reason)
	}

	// In test environment, return mock data to avoid network calls
	if s.isTestEnvironment() {
		return s.getMockPoolData(poolAddress), nil
	}

	// Use shared RPC client from contract executor to respect rate limits
	// Creating new clients bypasses rate limiting and causes 429 errors
	var client *ethclient.Client
	if s.contractExecutor != nil {
		client = s.contractExecutor.GetClient()
	}

	if client == nil {
		// Fallback: create new client only if no shared client available
		rpcEndpoint := os.Getenv("ARBITRUM_RPC_ENDPOINT")
		if rpcEndpoint == "" {
			rpcEndpoint = "wss://arbitrum-mainnet.core.chainstack.com/53c30e7a941160679fdcc396c894fc57"
		}
		var err error
		client, err = ethclient.Dial(rpcEndpoint)
		if err != nil {
			return nil, fmt.Errorf("failed to connect to Ethereum node: %w", err)
		}
		defer client.Close()
	}

	// Create Uniswap V3 pool interface
	pool := uniswap.NewUniswapV3Pool(address, client)

	// Validate that this is a real pool contract
	if !uniswap.IsValidPool(context.Background(), client, address) {
		return nil, fmt.Errorf("invalid pool contract at address %s", address.Hex())
	}

	// Fetch real pool state from the blockchain
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	poolState, err := pool.GetPoolState(ctx)
	if err != nil {
		s.logger.Warn(fmt.Sprintf("Failed to fetch real pool state for %s: %v", address.Hex(), err))

		// Record failure for potential blacklisting
		s.recordPoolFailure(address, err.Error())

		return nil, fmt.Errorf("failed to fetch pool state: %w", err)
	}

	// Determine tick spacing based on fee tier
	tickSpacing := 60 // Default for 0.3% fee
	switch poolState.Fee {
	case 100: // 0.01%
		tickSpacing = 1
	case 500: // 0.05%
		tickSpacing = 10
	case 3000: // 0.3%
		tickSpacing = 60
	case 10000: // 1%
		tickSpacing = 200
	}

	// Determine protocol (assume UniswapV3 for now, could be enhanced to detect protocol)
	protocol := "UniswapV3"

	// Create pool data from real blockchain state
	poolData := &CachedData{
		Address:      address,
		Token0:       poolState.Token0,
		Token1:       poolState.Token1,
		Fee:          poolState.Fee,
		Liquidity:    poolState.Liquidity,
		SqrtPriceX96: poolState.SqrtPriceX96,
		Tick:         poolState.Tick,
		TickSpacing:  tickSpacing,
		Protocol:     protocol,
		LastUpdated:  time.Now(),
	}

	liquidityStr := "0"
	if poolState.Liquidity != nil {
		liquidityStr = poolState.Liquidity.String()
	}
	s.logger.Info(fmt.Sprintf("Fetched real pool data for %s: Token0=%s, Token1=%s, Fee=%d, Liquidity=%s",
		address.Hex(), poolState.Token0.Hex(), poolState.Token1.Hex(), poolState.Fee, liquidityStr))

	return poolData, nil
}

// updatePoolData updates cached pool data from an event
func (s *MarketScanner) updatePoolData(event events.Event) {
	poolKey := event.PoolAddress.Hex()

	s.cacheMutex.Lock()
	defer s.cacheMutex.Unlock()

	// Update existing cache entry or create new one
	if pool, exists := s.cache[poolKey]; exists {
		// Update liquidity if provided
		if event.Liquidity != nil {
			pool.Liquidity = event.Liquidity
		}

		// Update sqrtPriceX96 if provided
		if event.SqrtPriceX96 != nil {
			pool.SqrtPriceX96 = event.SqrtPriceX96
		}

		// Update tick if provided
		if event.Tick != 0 {
			pool.Tick = event.Tick
		}

		// Update last updated time
		pool.LastUpdated = time.Now()

		// Log updated pool data to database
		s.logPoolData(pool)
	} else {
		// Create new pool entry
		pool := &CachedData{
			Address:      event.PoolAddress,
			Token0:       event.Token0,
			Token1:       event.Token1,
			Fee:          3000, // Default fee since not available in Event struct
			Liquidity:    event.Liquidity,
			SqrtPriceX96: event.SqrtPriceX96,
			Tick:         event.Tick,
			TickSpacing:  getTickSpacing(3000), // Default fee
			Protocol:     event.Protocol,
			LastUpdated:  time.Now(),
		}

		s.cache[poolKey] = pool

		// Log new pool data to database
		s.logPoolData(pool)
	}

	s.logger.Debug(fmt.Sprintf("Updated cache for pool %s", event.PoolAddress.Hex()))
}

// cleanupCache removes expired cache entries
func (s *MarketScanner) cleanupCache() {
	ticker := time.NewTicker(10 * time.Minute)
	defer ticker.Stop()

	for {
		select {
		case <-ticker.C:
			s.cacheMutex.Lock()
			for key, data := range s.cache {
				if time.Since(data.LastUpdated) > s.cacheTTL {
					delete(s.cache, key)
					s.logger.Debug(fmt.Sprintf("Removed expired cache entry: %s", key))
				}
			}
			s.cacheMutex.Unlock()
		}
	}
}

// isTestEnvironment checks if we're running in a test environment
func (s *MarketScanner) isTestEnvironment() bool {
	// Check for explicit test environment variable
	if os.Getenv("GO_TEST") == "true" {
		return true
	}

	// Check for testing framework flags
	for _, arg := range os.Args {
		if strings.HasPrefix(arg, "-test.") || arg == "test" {
			return true
		}
	}

	// Check if the program name is from 'go test'
	progName := os.Args[0]
	if strings.Contains(progName, ".test") || strings.HasSuffix(progName, ".test") {
		return true
	}

	// Check if running under go test command
	if strings.Contains(progName, "go_build_") && strings.Contains(progName, "_test") {
		return true
	}

	// Default to production mode - NEVER return true by default
	return false
}

// getMockPoolData returns mock pool data for testing
func (s *MarketScanner) getMockPoolData(poolAddress string) *CachedData {
	// Create deterministic mock data based on pool address
	mockTokens := tokens.GetArbitrumTokens()

	// Use different token pairs based on pool address
	var token0, token1 common.Address
	switch poolAddress {
	case "0x88e6A0c2dDD26FEEb64F039a2c41296FcB3f5640":
		token0 = mockTokens.USDC
		token1 = mockTokens.WETH
	case "0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc":
		token0 = mockTokens.USDC
		token1 = mockTokens.WETH
	default:
		token0 = mockTokens.USDC
		token1 = mockTokens.WETH
	}

	// Convert big.Int to uint256.Int for compatibility
	liquidity := uint256.NewInt(1000000000000000000) // 1 ETH equivalent

	// Create a reasonable sqrtPriceX96 value for ~2000 USDC per ETH
	sqrtPrice, _ := uint256.FromHex("0x668F0BD9C5DB9D2F2DF6A0E4C") // Reasonable value

	return &CachedData{
		Address:      common.HexToAddress(poolAddress),
		Token0:       token0,
		Token1:       token1,
		Fee:          3000, // 0.3%
		TickSpacing:  60,
		Liquidity:    liquidity,
		SqrtPriceX96: sqrtPrice,
		Tick:         -74959, // Corresponds to the sqrt price above
		Protocol:     "UniswapV3",
		LastUpdated:  time.Now(),
	}
}

// getTickSpacing returns tick spacing based on fee tier
func getTickSpacing(fee int64) int {
	switch fee {
	case 100: // 0.01%
		return 1
	case 500: // 0.05%
		return 10
	case 3000: // 0.3%
		return 60
	case 10000: // 1%
		return 200
	default:
		return 60 // Default to 0.3% fee spacing
	}
}

// calculateUniswapV3Output calculates swap output using proper Uniswap V3 concentrated liquidity math
func (s *MarketScanner) calculateUniswapV3Output(amountIn *big.Int, pool *CachedData) (*big.Int, error) {
	// Calculate the new sqrt price after the swap using Uniswap V3 formula
	// Δ√P = (ΔY * √P) / (L + ΔY * √P)

	sqrtPrice := pool.SqrtPriceX96.ToBig()
	liquidity := pool.Liquidity.ToBig()

	// Validate amount size for calculations
	if amountIn.BitLen() > 256 {
		return nil, fmt.Errorf("amountIn too large for calculations")
	}

	// FIXED: Properly scale calculations to avoid overflow
	// Use big.Float for intermediate calculations to handle X96 scaling
	sqrtPriceFloat := new(big.Float).SetInt(sqrtPrice)
	liquidityFloat := new(big.Float).SetInt(liquidity)
	amountInFloat := new(big.Float).SetInt(amountIn)

	// Q96 constant = 2^96
	Q96 := new(big.Float).SetInt(new(big.Int).Lsh(big.NewInt(1), 96))

	// Calculate new sqrtPrice: newSqrtPrice = (L * sqrtPrice) / (L + amountIn)
	// Note: This is simplified - proper V3 calculation would account for tick ranges
	numerator := new(big.Float).Mul(liquidityFloat, sqrtPriceFloat)
	denominator := new(big.Float).Add(liquidityFloat, amountInFloat)
	newSqrtPriceFloat := new(big.Float).Quo(numerator, denominator)

	// Calculate output: amountOut = L * (sqrtPrice - newSqrtPrice) / Q96
	priceDiffFloat := new(big.Float).Sub(sqrtPriceFloat, newSqrtPriceFloat)
	amountOutFloat := new(big.Float).Mul(liquidityFloat, priceDiffFloat)
	amountOutFloat.Quo(amountOutFloat, Q96) // Divide by 2^96 to un-scale

	// Convert back to big.Int
	amountOut := new(big.Int)
	amountOutFloat.Int(amountOut)

	// Sanity check: if amountOut is still massive or negative, return error
	if amountOut.BitLen() > 128 || amountOut.Sign() < 0 {
		return nil, fmt.Errorf("calculated amountOut is invalid: %s", amountOut.String())
	}

	// Apply fee (get fee from pool or default to 3000 = 0.3%)
	fee := pool.Fee
	if fee == 0 {
		fee = 3000 // Default 0.3%
	}

	// Calculate fee amount
	feeAmount := new(big.Int).Mul(amountOut, big.NewInt(int64(fee)))
	feeAmount = feeAmount.Div(feeAmount, big.NewInt(1000000))

	// Subtract fee from output
	finalAmountOut := new(big.Int).Sub(amountOut, feeAmount)

	amountInStr := "0"
	if amountIn != nil {
		amountInStr = amountIn.String()
	}
	amountOutStr := "0"
	if amountOut != nil {
		amountOutStr = amountOut.String()
	}
	finalAmountOutStr := "0"
	if finalAmountOut != nil {
		finalAmountOutStr = finalAmountOut.String()
	}
	s.logger.Debug(fmt.Sprintf("V3 calculation: amountIn=%s, amountOut=%s, fee=%d, finalOut=%s",
		amountInStr, amountOutStr, fee, finalAmountOutStr))

	return finalAmountOut, nil
}

// calculateFallbackOutput provides fallback calculation when V3 math fails
func (s *MarketScanner) calculateFallbackOutput(amountIn *big.Int, priceDiff float64) *big.Int {
	// Simple linear approximation based on price difference
	priceDiffInt := big.NewInt(int64(priceDiff * 1000000))
	amountOut := new(big.Int).Mul(amountIn, priceDiffInt)
	amountOut = amountOut.Div(amountOut, big.NewInt(1000000))

	// Apply standard 0.3% fee
	fee := new(big.Int).Mul(amountOut, big.NewInt(3000))
	fee = fee.Div(fee, big.NewInt(1000000))

	return new(big.Int).Sub(amountOut, fee)
}

// calculateMarketImpact estimates the market impact of a large trade
func (s *MarketScanner) calculateMarketImpact(amountIn *big.Int, pool *CachedData) *big.Int {
	if pool.Liquidity == nil {
		return big.NewInt(0)
	}

	// Market impact increases with trade size relative to liquidity
	liquidity := pool.Liquidity.ToBig()

	// Calculate impact ratio: amountIn / liquidity
	impactRatio := new(big.Float).Quo(new(big.Float).SetInt(amountIn), new(big.Float).SetInt(liquidity))

	// Impact increases quadratically for large trades
	impactSquared := new(big.Float).Mul(impactRatio, impactRatio)

	// Convert back to wei amount (impact as percentage of trade)
	impact := new(big.Float).Mul(new(big.Float).SetInt(amountIn), impactSquared)
	result := new(big.Int)
	impact.Int(result)

	// Cap maximum impact at 10% of trade size
	maxImpact := new(big.Int).Div(amountIn, big.NewInt(10))
	if result.Cmp(maxImpact) > 0 {
		result = maxImpact
	}

	return result
}

// calculateDynamicGasCost calculates gas cost based on current network conditions
func (s *MarketScanner) calculateDynamicGasCost(event events.Event, pool *CachedData) *big.Int {
	// Base gas costs for different operation types
	baseGas := big.NewInt(200000) // Simple swap

	// Increase gas for complex operations
	if pool.Fee == 500 { // V3 concentrated position
		baseGas = big.NewInt(350000)
	} else if event.Protocol == "UniswapV3" { // V3 operations generally more expensive
		baseGas = big.NewInt(300000)
	}

	// Get current gas price (simplified - in production would fetch from network)
	gasPrice := big.NewInt(2000000000) // 2 gwei base

	// Add priority fee for MEV transactions
	priorityFee := big.NewInt(5000000000) // 5 gwei priority
	totalGasPrice := new(big.Int).Add(gasPrice, priorityFee)

	// Calculate total gas cost
	gasCost := new(big.Int).Mul(baseGas, totalGasPrice)

	s.logger.Debug(fmt.Sprintf("Gas calculation: baseGas=%s, gasPrice=%s, totalCost=%s",
		baseGas.String(), totalGasPrice.String(), gasCost.String()))

	return gasCost
}

// calculateMEVPremium calculates the premium needed to compete with other MEV bots
func (s *MarketScanner) calculateMEVPremium(grossProfit *big.Int, priceDiff float64) *big.Int {
	// MEV premium increases with profit potential
	profitFloat := new(big.Float).SetInt(grossProfit)

	// Base premium: 5% of gross profit
	basePremium := new(big.Float).Mul(profitFloat, big.NewFloat(0.05))

	// Increase premium for highly profitable opportunities (more competition)
	if priceDiff > 0.02 { // > 2% price difference
		competitionMultiplier := big.NewFloat(1.5 + priceDiff*10) // Scale with opportunity
		basePremium.Mul(basePremium, competitionMultiplier)
	}

	// Convert to big.Int
	premium := new(big.Int)
	basePremium.Int(premium)

	// Cap premium at 30% of gross profit
	maxPremium := new(big.Int).Div(grossProfit, big.NewInt(3))
	if premium.Cmp(maxPremium) > 0 {
		premium = maxPremium
	}

	return premium
}

// calculateSlippageTolerance calculates acceptable slippage for the trade
func (s *MarketScanner) calculateSlippageTolerance(amountIn *big.Int, pool *CachedData) *big.Int {
	// Base slippage tolerance: 0.5%
	baseSlippage := new(big.Float).Mul(new(big.Float).SetInt(amountIn), big.NewFloat(0.005))

	// Increase slippage tolerance for larger trades relative to liquidity
	if pool.Liquidity != nil {
		liquidity := pool.Liquidity.ToBig()
		tradeRatio := new(big.Float).Quo(new(big.Float).SetInt(amountIn), new(big.Float).SetInt(liquidity))

		// If trade is > 1% of liquidity, increase slippage tolerance
		if ratio, _ := tradeRatio.Float64(); ratio > 0.01 {
			multiplier := big.NewFloat(1 + ratio*5) // Scale slippage with trade size
			baseSlippage.Mul(baseSlippage, multiplier)
		}
	}

	// Convert to big.Int
	slippage := new(big.Int)
	baseSlippage.Int(slippage)

	// Cap maximum slippage at 2% of trade amount
	maxSlippage := new(big.Int).Div(amountIn, big.NewInt(50)) // 2%
	if slippage.Cmp(maxSlippage) > 0 {
		slippage = maxSlippage
	}

	return slippage
}

// getFactoryForProtocol returns the factory address for a known DEX protocol
func (s *MarketScanner) getFactoryForProtocol(protocol string) common.Address {
	// Known factory addresses on Arbitrum
	knownFactories := map[string]common.Address{
		"UniswapV3": common.HexToAddress("0x1F98431c8aD98523631AE4a59f267346ea31F984"),
		"UniswapV2": common.HexToAddress("0xc35DADB65012eC5796536bD9864eD8773aBc74C4"), // SushiSwap V2 factory
		"SushiSwap": common.HexToAddress("0xc35DADB65012eC5796536bD9864eD8773aBc74C4"),
		"Camelot":   common.HexToAddress("0x6EcCab422D763aC031210895C81787E87B82A80f"),
		"TraderJoe": common.HexToAddress("0xaE4EC9901c3076D0DdBe76A520F9E90a6227aCB7"),
		"Balancer":  common.HexToAddress("0xBA12222222228d8Ba445958a75a0704d566BF2C8"),
		"Curve":     common.HexToAddress("0x445FE580eF8d70FF569aB36e80c647af338db351"),
	}

	if factory, exists := knownFactories[protocol]; exists {
		return factory
	}

	// Default to UniswapV3 if unknown
	return knownFactories["UniswapV3"]
}

// GetMarketDataLogger returns the market data logger
func (s *MarketScanner) GetMarketDataLogger() *marketdata.MarketDataLogger {
	return s.marketDataLogger
}

// GetProfitCalculator returns the profit calculator
func (s *MarketScanner) GetProfitCalculator() *profitcalc.ProfitCalculator {
	return s.profitCalculator
}

// GetOpportunityRanker returns the opportunity ranker
func (s *MarketScanner) GetOpportunityRanker() *profitcalc.OpportunityRanker {
	return s.opportunityRanker
}

// GetPoolData retrieves pool data with caching
func (s *MarketScanner) GetPoolData(poolAddress string) (*CachedData, error) {
	return s.getPoolData(poolAddress)
}

// UpdatePoolData updates cached pool data from an event
func (s *MarketScanner) UpdatePoolData(event events.Event) {
	s.updatePoolData(event)
}

// IsSignificantMovement determines if a price movement is significant enough to exploit
func (s *MarketScanner) IsSignificantMovement(movement *PriceMovement, threshold float64) bool {
	return s.isSignificantMovement(movement, threshold)
}

// FindRelatedPools finds pools that trade the same token pair
func (s *MarketScanner) FindRelatedPools(token0, token1 common.Address) []*CachedData {
	return s.findRelatedPools(token0, token1)
}

// EstimateProfit estimates the potential profit from an arbitrage opportunity using real slippage protection
func (s *MarketScanner) EstimateProfit(event events.Event, pool *CachedData, priceDiff float64) *big.Int {
	return s.estimateProfit(event, pool, priceDiff)
}

// FindTriangularArbitrageOpportunities looks for triangular arbitrage opportunities
func (s *MarketScanner) FindTriangularArbitrageOpportunities(event events.Event) []stypes.ArbitrageOpportunity {
	return s.findTriangularArbitrageOpportunities(event)
}

// ExecuteArbitrageOpportunity executes an arbitrage opportunity using the smart contract
func (s *MarketScanner) ExecuteArbitrageOpportunity(opportunity stypes.ArbitrageOpportunity) {
	s.executeArbitrageOpportunity(opportunity)
}

// LogSwapEvent logs a swap event to the database
func (s *MarketScanner) LogSwapEvent(event events.Event) {
	s.logSwapEvent(event)
}

// LogLiquidityEvent logs a liquidity event to the database
func (s *MarketScanner) LogLiquidityEvent(event events.Event, eventType string) {
	s.logLiquidityEvent(event, eventType)
}

// LogPoolData logs pool data to the database
func (s *MarketScanner) LogPoolData(poolData *CachedData) {
	s.logPoolData(poolData)
}

// GetFactoryForProtocol returns the factory address for a known DEX protocol
func (s *MarketScanner) GetFactoryForProtocol(protocol string) common.Address {
	return s.getFactoryForProtocol(protocol)
}

// Config returns the scanner's configuration
func (s *MarketScanner) Config() *config.BotConfig {
	return s.config
}