package swap

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

	"github.com/ethereum/go-ethereum/common"
	"github.com/holiman/uint256"

	"github.com/fraktal/mev-beta/internal/logger"
	"github.com/fraktal/mev-beta/pkg/events"
	"github.com/fraktal/mev-beta/pkg/marketdata"
	"github.com/fraktal/mev-beta/pkg/profitcalc"
	scannercommon "github.com/fraktal/mev-beta/pkg/scanner/common"
	"github.com/fraktal/mev-beta/pkg/scanner/market"
	stypes "github.com/fraktal/mev-beta/pkg/types"
	"github.com/fraktal/mev-beta/pkg/uniswap"
)

// SwapAnalyzer handles analysis of swap events for price movement opportunities
type SwapAnalyzer struct {
	logger            *logger.Logger
	marketDataLogger  *marketdata.MarketDataLogger
	profitCalculator  *profitcalc.ProfitCalculator
	opportunityRanker *profitcalc.OpportunityRanker
}

var (
	factoryProtocolMap = map[common.Address]string{
		common.HexToAddress("0x1F98431c8aD98523631AE4a59f267346ea31F984"): "UniswapV3",
		common.HexToAddress("0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f"): "UniswapV2",
		common.HexToAddress("0xf1D7CC64Fb4452F05c498126312eBE29f30Fbcf9"): "UniswapV2",
		common.HexToAddress("0xc35DADB65012eC5796536bD9864eD8773aBc74C4"): "SushiSwap",
		common.HexToAddress("0xBA12222222228d8Ba445958a75a0704d566BF2C8"): "Balancer",
		common.HexToAddress("0xF18056Bbd320E96A48e3Fbf8bC061322531aac99"): "Curve",
		common.HexToAddress("0x5ffe7FB82894076ECB99A30D6A32e969e6e35E98"): "Curve",
		common.HexToAddress("0x5F1dddbf348aC2fbe22a163e30F99F9ECE3DD50a"): "KyberElastic",
		common.HexToAddress("0x1a3c9B1d2F0529D97f2afC5136Cc23e58f1FD35B"): "Camelot",
	}

	protocolDefaultFactory = map[string]common.Address{
		"UniswapV3":    common.HexToAddress("0x1F98431c8aD98523631AE4a59f267346ea31F984"),
		"UniswapV2":    common.HexToAddress("0xf1D7CC64Fb4452F05c498126312eBE29f30Fbcf9"),
		"SushiSwap":    common.HexToAddress("0xc35DADB65012eC5796536bD9864eD8773aBc74C4"),
		"Balancer":     common.HexToAddress("0xBA12222222228d8Ba445958a75a0704d566BF2C8"),
		"Curve":        common.HexToAddress("0xF18056Bbd320E96A48e3Fbf8bC061322531aac99"),
		"KyberElastic": common.HexToAddress("0x5F1dddbf348aC2fbe22a163e30F99F9ECE3DD50a"),
		"Camelot":      common.HexToAddress("0x1a3c9B1d2F0529D97f2afC5136Cc23e58f1FD35B"),
	}

	protocolSpecialByAddress = map[common.Address]string{
		common.HexToAddress("0xBA12222222228d8Ba445958a75a0704d566BF2C8"): "Balancer",
		common.HexToAddress("0xF18056Bbd320E96A48e3Fbf8bC061322531aac99"): "Curve",
		common.HexToAddress("0x5F1dddbf348aC2fbe22a163e30F99F9ECE3DD50a"): "KyberElastic",
	}
)

// NewSwapAnalyzer creates a new swap analyzer
func NewSwapAnalyzer(
	logger *logger.Logger,
	marketDataLogger *marketdata.MarketDataLogger,
	profitCalculator *profitcalc.ProfitCalculator,
	opportunityRanker *profitcalc.OpportunityRanker,
) *SwapAnalyzer {
	return &SwapAnalyzer{
		logger:            logger,
		marketDataLogger:  marketDataLogger,
		profitCalculator:  profitCalculator,
		opportunityRanker: opportunityRanker,
	}
}

// AnalyzeSwapEvent analyzes a swap event for arbitrage opportunities
func (s *SwapAnalyzer) AnalyzeSwapEvent(event events.Event, marketScanner *market.MarketScanner) {
	s.logger.Debug(fmt.Sprintf("Analyzing swap event in pool %s", event.PoolAddress))

	// Validate pool address before attempting expensive lookups
	if event.PoolAddress == (common.Address{}) {
		s.logger.Warn(fmt.Sprintf("Skipping swap analysis: empty pool address (tx: %s)", event.TransactionHash.Hex()))
		return
	}

	if event.PoolAddress == event.Token0 || event.PoolAddress == event.Token1 {
		s.logger.Warn(fmt.Sprintf("Skipping swap analysis: pool address %s matches token address (tx: %s)", event.PoolAddress.Hex(), event.TransactionHash.Hex()))
		return
	}

	if strings.HasPrefix(strings.ToLower(event.PoolAddress.Hex()), "0x000000") {
		s.logger.Warn(fmt.Sprintf("Skipping swap analysis: suspicious pool address %s (tx: %s)", event.PoolAddress.Hex(), event.TransactionHash.Hex()))
		return
	}

	// Get comprehensive pool data to determine factory and fee
	poolInfo, poolExists := s.marketDataLogger.GetPoolInfo(event.PoolAddress)
	factory := common.Address{}
	fee := uint32(3000) // Default 0.3%
	if poolExists {
		factory = poolInfo.Factory
		fee = poolInfo.Fee
	} else {
		// Determine factory from known DEX protocols
		factory = marketScanner.GetFactoryForProtocol(event.Protocol)
	}

	// Create comprehensive swap event data for market data logger
	swapData := &marketdata.SwapEventData{
		TxHash:       event.TransactionHash,
		BlockNumber:  event.BlockNumber,
		LogIndex:     uint(0), // Default log index (would need to be extracted from receipt)
		Timestamp:    time.Now(),
		PoolAddress:  event.PoolAddress,
		Factory:      factory,
		Protocol:     event.Protocol,
		Token0:       event.Token0,
		Token1:       event.Token1,
		Sender:       common.Address{}, // Default sender (would need to be extracted from transaction)
		Recipient:    common.Address{}, // Default recipient (would need to be extracted from transaction)
		SqrtPriceX96: event.SqrtPriceX96,
		Liquidity:    event.Liquidity,
		Tick:         int32(event.Tick),
	}

	// Extract swap amounts from event (handle signed amounts correctly)
	if event.Amount0 != nil && event.Amount1 != nil {
		amount0Float := new(big.Float).SetInt(event.Amount0)
		amount1Float := new(big.Float).SetInt(event.Amount1)

		// Determine input/output based on sign (negative means token was removed from pool = output)
		if amount0Float.Sign() < 0 {
			// Token0 out, Token1 in
			swapData.Amount0Out = new(big.Int).Abs(event.Amount0)
			swapData.Amount1In = event.Amount1
			swapData.Amount0In = big.NewInt(0)
			swapData.Amount1Out = big.NewInt(0)
		} else if amount1Float.Sign() < 0 {
			// Token0 in, Token1 out
			swapData.Amount0In = event.Amount0
			swapData.Amount1Out = new(big.Int).Abs(event.Amount1)
			swapData.Amount0Out = big.NewInt(0)
			swapData.Amount1In = big.NewInt(0)
		} else {
			// Both positive (shouldn't happen in normal swaps, but handle gracefully)
			swapData.Amount0In = event.Amount0
			swapData.Amount1In = event.Amount1
			swapData.Amount0Out = big.NewInt(0)
			swapData.Amount1Out = big.NewInt(0)
		}
	}

	// Calculate USD values using profit calculator's price oracle
	swapData.AmountInUSD, swapData.AmountOutUSD, swapData.FeeUSD = s.calculateSwapUSDValues(swapData, fee)

	// Calculate price impact based on pool liquidity and swap amounts
	swapData.PriceImpact = s.calculateSwapPriceImpact(event, swapData)

	// Get pool data with caching
	poolData, err := marketScanner.GetPoolData(event.PoolAddress.Hex())
	if err != nil {
		if errors.Is(err, market.ErrInvalidPoolCandidate) {
			s.logger.Debug("Skipping pool data fetch for invalid candidate",
				"pool", event.PoolAddress,
				"tx", event.TransactionHash,
				"error", err)
		} else {
			// Enhanced error logging with context - check if this is an ERC-20 token misclassified as a pool
			errorMsg := fmt.Sprintf("Error getting pool data for %s: %v", event.PoolAddress, err)
			contextMsg := fmt.Sprintf("event_type:%s protocol:%s block:%d tx:%s",
				event.Type.String(), event.Protocol, event.BlockNumber, event.TransactionHash.Hex())
			s.logger.Error(fmt.Sprintf("%s [context: %s]", errorMsg, contextMsg))
		}
		return
	}

	// CRITICAL FIX: Use actual token addresses from pool contract, not zero addresses from event
	// The swap parser leaves Token0/Token1 as zeros expecting the caller to fill them,
	// but poolData already contains the correct addresses from token0()/token1() calls
	if poolData.Token0 != (common.Address{}) && poolData.Token1 != (common.Address{}) {
		swapData.Token0 = poolData.Token0
		swapData.Token1 = poolData.Token1
		event.Token0 = poolData.Token0
		event.Token1 = poolData.Token1

		s.logger.Debug(fmt.Sprintf("Updated swap token addresses from pool data: token0=%s, token1=%s",
			poolData.Token0.Hex(), poolData.Token1.Hex()))
	} else {
		// If pool data doesn't have token addresses, this is invalid - reject the event
		s.logger.Warn(fmt.Sprintf("Pool data missing token addresses for pool %s, skipping event",
			event.PoolAddress.Hex()))
		return
	}

	finalProtocol := s.detectSwapProtocol(event, poolInfo, poolData, factory)
	if finalProtocol == "" || strings.EqualFold(finalProtocol, "unknown") {
		if fallback := canonicalProtocolName(event.Protocol); fallback != "" {
			finalProtocol = fallback
		} else {
			finalProtocol = "Unknown"
		}
	}

	event.Protocol = finalProtocol
	swapData.Protocol = finalProtocol
	if poolData != nil {
		poolData.Protocol = finalProtocol
	}

	factory = s.resolveFactory(factory, finalProtocol, marketScanner)
	swapData.Factory = factory

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := s.marketDataLogger.LogSwapEvent(ctx, event, swapData); err != nil {
		s.logger.Debug(fmt.Sprintf("Failed to log swap event to market data logger: %v", err))
	}

	// Log the swap event to database (legacy)
	marketScanner.LogSwapEvent(event)

	s.marketDataLogger.UpdatePoolMetadata(event.PoolAddress, finalProtocol, factory)

	// DEBUG: Log zero address events to trace their source
	if event.PoolAddress == (common.Address{}) {
		s.logger.Error(fmt.Sprintf("ZERO ADDRESS DEBUG [ANALYZER]: Received Event with zero PoolAddress - TxHash: %s, Protocol: %s, Token0: %s, Token1: %s, Type: %v",
			event.TransactionHash.Hex(), event.Protocol, event.Token0.Hex(), event.Token1.Hex(), event.Type))
	}

	// Calculate price impact
	priceMovement, err := s.calculatePriceMovement(event, poolData)
	if err != nil {
		s.logger.Error(fmt.Sprintf("Error calculating price movement for pool %s: %v", event.PoolAddress, err))
		return
	}

	// Log opportunity with actual swap amounts from event (legacy)
	s.logSwapOpportunity(event, poolData, priceMovement, marketScanner)

	// Check if the movement is significant
	if marketScanner.IsSignificantMovement(priceMovement, marketScanner.Config().MinProfitThreshold) {
		s.logger.Info(fmt.Sprintf("Significant price movement detected in pool %s: %+v", event.PoolAddress, priceMovement))

		// Look for arbitrage opportunities
		opportunities := s.findArbitrageOpportunities(event, priceMovement, marketScanner)
		if len(opportunities) > 0 {
			s.logger.Info(fmt.Sprintf("Found %d arbitrage opportunities for pool %s", len(opportunities), event.PoolAddress))
			for _, opp := range opportunities {
				s.logger.Info(fmt.Sprintf("Arbitrage opportunity: %+v", opp))
				// Execute the arbitrage opportunity
				marketScanner.ExecuteArbitrageOpportunity(opp)
			}
		} else {
			s.logger.Debug(fmt.Sprintf("Price movement in pool %s is not significant: %f", event.PoolAddress, priceMovement.PriceImpact))
		}
	}
}

// logSwapOpportunity logs swap opportunities using actual amounts from events
func (s *SwapAnalyzer) logSwapOpportunity(event events.Event, poolData *market.CachedData, priceMovement *market.PriceMovement, marketScanner *market.MarketScanner) {
	// Convert amounts from big.Int to big.Float for profit calculation
	amountInFloat := big.NewFloat(0)
	amountOutFloat := big.NewFloat(0)
	amountInDisplay := float64(0)
	amountOutDisplay := float64(0)

	// For swap events, Amount0 and Amount1 represent the actual swap amounts
	// The sign indicates direction (positive = token added to pool, negative = token removed from pool)
	if event.Amount0 != nil {
		amount0Float := new(big.Float).SetInt(event.Amount0)
		if event.Amount1 != nil {
			amount1Float := new(big.Float).SetInt(event.Amount1)

			// Determine input/output based on sign (negative means token was removed from pool = output)
			if amount0Float.Sign() < 0 {
				// Token0 out, Token1 in
				amountOutFloat = new(big.Float).Abs(amount0Float)
				amountInFloat = amount1Float
				amountOutDisplay, _ = new(big.Float).Quo(amountOutFloat, big.NewFloat(1e18)).Float64()
				amountInDisplay, _ = new(big.Float).Quo(amountInFloat, big.NewFloat(1e18)).Float64()
			} else {
				// Token0 in, Token1 out
				amountInFloat = amount0Float
				amountOutFloat = new(big.Float).Abs(amount1Float)
				amountInDisplay, _ = new(big.Float).Quo(amountInFloat, big.NewFloat(1e18)).Float64()
				amountOutDisplay, _ = new(big.Float).Quo(amountOutFloat, big.NewFloat(1e18)).Float64()
			}
		}
	}

	// Analyze arbitrage opportunity using the profit calculator
	var estimatedProfitUSD float64 = 0.0
	var profitData map[string]interface{}

	if amountInFloat.Sign() > 0 && amountOutFloat.Sign() > 0 {
		opportunity := s.profitCalculator.AnalyzeSwapOpportunity(
			context.Background(),
			event.Token0,
			event.Token1,
			new(big.Float).Quo(amountInFloat, big.NewFloat(1e18)),  // Convert to ETH units
			new(big.Float).Quo(amountOutFloat, big.NewFloat(1e18)), // Convert to ETH units
			event.Protocol,
		)

		if opportunity != nil {
			// Add opportunity to ranking system
			rankedOpp := s.opportunityRanker.AddOpportunity(opportunity)

			// Use the calculated profit for logging
			if opportunity.NetProfit != nil {
				estimatedProfitFloat, _ := opportunity.NetProfit.Float64()
				estimatedProfitUSD = estimatedProfitFloat * 2000 // Assume 1 ETH = $2000 for USD conversion
			}

			// Add detailed profit analysis to additional data
			profitData = map[string]interface{}{
				"arbitrageId":        opportunity.ID,
				"isExecutable":       opportunity.IsExecutable,
				"rejectReason":       opportunity.RejectReason,
				"confidence":         opportunity.Confidence,
				"profitMargin":       opportunity.ProfitMargin,
				"netProfitETH":       s.profitCalculator.FormatEther(opportunity.NetProfit),
				"gasCostETH":         s.profitCalculator.FormatEther(opportunity.GasCost),
				"estimatedProfitETH": s.profitCalculator.FormatEther(opportunity.EstimatedProfit),
			}

			// Add ranking data if available
			if rankedOpp != nil {
				profitData["opportunityScore"] = rankedOpp.Score
				profitData["opportunityRank"] = rankedOpp.Rank
				profitData["competitionRisk"] = rankedOpp.CompetitionRisk
				profitData["updateCount"] = rankedOpp.UpdateCount
			}
		}
	} else if priceMovement != nil {
		// Fallback to simple price impact calculation
		estimatedProfitUSD = priceMovement.PriceImpact * 100
	}

	// Resolve token symbols
	tokenIn := s.resolveTokenSymbol(event.Token0.Hex())
	tokenOut := s.resolveTokenSymbol(event.Token1.Hex())

	// Create additional data with profit analysis
	additionalData := map[string]interface{}{
		"poolAddress": event.PoolAddress.Hex(),
		"protocol":    event.Protocol,
		"token0":      event.Token0.Hex(),
		"token1":      event.Token1.Hex(),
		"tokenIn":     tokenIn,
		"tokenOut":    tokenOut,
		"blockNumber": event.BlockNumber,
	}

	// Add price impact if available
	if priceMovement != nil {
		additionalData["priceImpact"] = priceMovement.PriceImpact
	}

	// Merge profit analysis data
	if profitData != nil {
		for k, v := range profitData {
			additionalData[k] = v
		}
	}

	// Log the opportunity using actual swap amounts and profit analysis
	s.logger.Opportunity(event.TransactionHash.Hex(), "", event.PoolAddress.Hex(), "Swap", event.Protocol,
		amountInDisplay, amountOutDisplay, 0.0, estimatedProfitUSD, additionalData)
}

// resolveTokenSymbol converts token address to human-readable symbol
func (s *SwapAnalyzer) resolveTokenSymbol(tokenAddress string) string {
	// Convert to lowercase for consistent lookup
	addr := strings.ToLower(tokenAddress)

	// Known Arbitrum token mappings (same as in L2 parser)
	tokenMap := map[string]string{
		"0x82af49447d8a07e3bd95bd0d56f35241523fbab1": "WETH",
		"0xaf88d065e77c8cc2239327c5edb3a432268e5831": "USDC",
		"0xff970a61a04b1ca14834a43f5de4533ebddb5cc8": "USDC.e",
		"0xfd086bc7cd5c481dcc9c85ebe478a1c0b69fcbb9": "USDT",
		"0x2f2a2543b76a4166549f7aab2e75bef0aefc5b0f": "WBTC",
		"0x912ce59144191c1204e64559fe8253a0e49e6548": "ARB",
		"0xfc5a1a6eb076a2c7ad06ed22c90d7e710e35ad0a": "GMX",
		"0xf97f4df75117a78c1a5a0dbb814af92458539fb4": "LINK",
		"0xfa7f8980b0f1e64a2062791cc3b0871572f1f7f0": "UNI",
		"0xba5ddd1f9d7f570dc94a51479a000e3bce967196": "AAVE",
		"0x0de59c86c306b9fead9fb67e65551e2b6897c3f6": "KUMA",
		"0x6efa9b8883dfb78fd75cd89d8474c44c3cbda469": "DIA",
		"0x440017a1b021006d556d7fc06a54c32e42eb745b": "G@ARB",
		"0x11cdb42b0eb46d95f990bedd4695a6e3fa034978": "CRV",
		"0x040d1edc9569d4bab2d15287dc5a4f10f56a56b8": "BAL",
		"0x354a6da3fcde098f8389cad84b0182725c6c91de": "COMP",
		"0x2e9a6df78e42c50b0cefcf9000d0c3a4d34e1dd5": "MKR",
	}

	if symbol, exists := tokenMap[addr]; exists {
		return symbol
	}

	// Return truncated address if not in mapping
	if len(tokenAddress) > 10 {
		return tokenAddress[:6] + "..." + tokenAddress[len(tokenAddress)-4:]
	}
	return tokenAddress
}

// calculatePriceMovement calculates the price movement from a swap event using cached mathematical functions
func (s *SwapAnalyzer) calculatePriceMovement(event events.Event, poolData *market.CachedData) (*market.PriceMovement, error) {
	s.logger.Debug(fmt.Sprintf("Calculating price movement for pool %s", event.PoolAddress))

	// Get current price from pool data using cached function
	currentPrice := uniswap.SqrtPriceX96ToPriceCached(poolData.SqrtPriceX96.ToBig())
	if currentPrice == nil {
		return nil, fmt.Errorf("failed to calculate current price from sqrtPriceX96")
	}

	// Calculate price impact based on swap amounts
	var priceImpact float64
	if event.Amount0.Sign() > 0 && event.Amount1.Sign() > 0 {
		// Both amounts are positive, calculate the impact
		amount0Float := new(big.Float).SetInt(event.Amount0)
		amount1Float := new(big.Float).SetInt(event.Amount1)

		// Price impact = |amount1 / amount0 - current_price| / current_price
		swapPrice := new(big.Float).Quo(amount1Float, amount0Float)
		priceDiff := new(big.Float).Sub(swapPrice, currentPrice)
		priceDiff.Abs(priceDiff)

		// Check if currentPrice is zero to prevent division by zero
		zero := new(big.Float).SetFloat64(0.0)
		if currentPrice.Cmp(zero) != 0 {
			priceImpactFloat := new(big.Float).Quo(priceDiff, currentPrice)
			priceImpact, _ = priceImpactFloat.Float64()

			// Validate: reject impossible price impacts (>1000% = 10.0)
			if priceImpact > 10.0 {
				s.logger.Warn(fmt.Sprintf("Price impact too large (%.2f), capping at 0", priceImpact))
				priceImpact = 0.0
			}
		}
	}

	// Use absolute values for amounts (UniswapV3 uses signed int256, but amounts should be positive)
	amountIn := new(big.Int).Abs(event.Amount0)
	amountOut := new(big.Int).Abs(event.Amount1)

	movement := &market.PriceMovement{
		Token0:      event.Token0.Hex(),
		Token1:      event.Token1.Hex(),
		Pool:        event.PoolAddress.Hex(),
		Protocol:    event.Protocol,
		AmountIn:    amountIn,
		AmountOut:   amountOut,
		PriceBefore: currentPrice,
		PriceAfter:  currentPrice, // For now, assume same price (could be calculated based on swap)
		PriceImpact: priceImpact,
		TickBefore:  poolData.Tick,
		TickAfter:   poolData.Tick, // For now, assume same tick
		Timestamp:   time.Now(),
	}

	amount0Str := "0"
	if event.Amount0 != nil {
		amount0Str = event.Amount0.String()
	}
	s.logger.Debug(fmt.Sprintf("Price movement calculated: impact=%.6f%%, amount_in=%s", priceImpact*100, amount0Str))
	return movement, nil
}

// findArbitrageOpportunities looks for arbitrage opportunities based on price movements
func (s *SwapAnalyzer) findArbitrageOpportunities(event events.Event, movement *market.PriceMovement, marketScanner *market.MarketScanner) []stypes.ArbitrageOpportunity {
	s.logger.Debug(fmt.Sprintf("Searching for arbitrage opportunities for pool %s", event.PoolAddress))

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

	// Get related pools for the same token pair
	relatedPools := marketScanner.FindRelatedPools(event.Token0, event.Token1)

	// If we have related pools, compare prices
	if len(relatedPools) > 0 {
		// Get the current price in this pool
		currentPrice := movement.PriceBefore

		// Compare with prices in related pools
		for _, pool := range relatedPools {
			// Skip the same pool
			if pool.Address == event.PoolAddress {
				continue
			}

			// Get pool data
			poolData, err := marketScanner.GetPoolData(pool.Address.Hex())
			if err != nil {
				// Enhanced error logging with context for related pool analysis
				errorMsg := fmt.Sprintf("Error getting pool data for related pool %s: %v", pool.Address.Hex(), err)
				contextMsg := fmt.Sprintf("original_pool:%s related_pool:%s token_pair:%s-%s",
					event.PoolAddress.Hex(), pool.Address.Hex(), pool.Token0.Hex(), pool.Token1.Hex())
				s.logger.Error(fmt.Sprintf("%s [context: %s]", errorMsg, contextMsg))
				continue
			}

			// Check if poolData.SqrtPriceX96 is nil to prevent panic
			if poolData.SqrtPriceX96 == nil {
				s.logger.Error(fmt.Sprintf("Pool data for %s has nil SqrtPriceX96", pool.Address.Hex()))
				continue
			}

			// Calculate price in the related pool using cached function
			relatedPrice := uniswap.SqrtPriceX96ToPriceCached(poolData.SqrtPriceX96.ToBig())

			// Check if currentPrice or relatedPrice is nil to prevent panic
			if currentPrice == nil || relatedPrice == nil {
				s.logger.Error(fmt.Sprintf("Nil price detected for pool comparison"))
				continue
			}

			// Calculate price difference
			priceDiff := new(big.Float).Sub(currentPrice, relatedPrice)
			// Check if relatedPrice is zero to prevent division by zero
			zero := new(big.Float).SetFloat64(0.0)
			if relatedPrice.Cmp(zero) == 0 {
				s.logger.Debug(fmt.Sprintf("Skipping pool %s: related price is zero", pool.Address.Hex()))
				continue
			}

			priceDiffRatio := new(big.Float).Quo(priceDiff, relatedPrice)

			// If there's a significant price difference, we might have an arbitrage opportunity
			priceDiffFloat, _ := priceDiffRatio.Float64()

			// Validate: reject impossible price differences (>1000% = 10.0)
			if priceDiffFloat > 10.0 || priceDiffFloat < -10.0 {
				s.logger.Debug(fmt.Sprintf("Skipping pool %s: price difference too large (%.2f)", pool.Address.Hex(), priceDiffFloat))
				continue
			}

			// Take absolute value for comparison
			priceDiffAbs := priceDiffFloat
			if priceDiffAbs < 0 {
				priceDiffAbs = -priceDiffAbs
			}
			// Lower threshold for Arbitrum where spreads are smaller
			arbitrageThreshold := 0.001 // 0.1% threshold instead of 0.5%
			if priceDiffAbs > arbitrageThreshold {
				// Estimate potential profit
				estimatedProfit := marketScanner.EstimateProfit(event, pool, priceDiffFloat)

				if estimatedProfit != nil && estimatedProfit.Sign() > 0 {
					// Calculate gas cost in wei (300k gas * current gas price estimate)
					gasPrice := big.NewInt(100000000) // 0.1 gwei default
					gasUnits := big.NewInt(300000)
					gasCost := new(big.Int).Mul(gasPrice, gasUnits)

					// Calculate net profit after gas
					netProfit := new(big.Int).Sub(estimatedProfit, gasCost)

					// Only create opportunity if still profitable after gas
					if netProfit.Sign() > 0 {
						now := time.Now()
						// Use a reasonable test amount (e.g., 0.1 ETH in wei)
						testAmount := big.NewInt(100000000000000000) // 0.1 ETH

						opp := stypes.ArbitrageOpportunity{
							ID:              fmt.Sprintf("arb_%d_%s", now.Unix(), event.PoolAddress.Hex()[:10]),
							Path:            []string{event.Token0.Hex(), event.Token1.Hex()},
							Pools:           []string{event.PoolAddress.Hex(), pool.Address.Hex()},
							AmountIn:        testAmount,
							Profit:          estimatedProfit,
							NetProfit:       netProfit,
							GasEstimate:     gasUnits,
							GasCost:         gasCost,
							EstimatedProfit: netProfit,
							RequiredAmount:  testAmount,
							ROI:             priceDiffAbs * 100, // Convert to percentage (use absolute value)
							Protocol:        fmt.Sprintf("%s->%s", event.Protocol, pool.Protocol),
							ExecutionTime:   200, // Estimated 200ms for direct arb
							Confidence:      0.7, // Higher confidence for direct arb
							PriceImpact:     priceDiffAbs, // Use absolute value for price impact
							MaxSlippage:     1.0,         // 1% max slippage
							TokenIn:         event.Token0,
							TokenOut:        event.Token1,
							Timestamp:       now.Unix(),
							DetectedAt:      now,
							ExpiresAt:       now.Add(3 * time.Second), // 3 second expiry for direct arb
							Urgency:         7,                        // Higher urgency
							Risk:            0.2,                      // Lower risk
							Profitable:      true,
						}
						opportunities = append(opportunities, opp)
						s.logger.Info(fmt.Sprintf("Found arbitrage opportunity: %+v", opp))
					}
				}
			}
		}
	}

	// Also look for triangular arbitrage opportunities
	triangularOpps := marketScanner.FindTriangularArbitrageOpportunities(event)
	opportunities = append(opportunities, triangularOpps...)

	return opportunities
}

// calculateSwapUSDValues calculates USD values for swap amounts using the profit calculator's price oracle
func (s *SwapAnalyzer) calculateSwapUSDValues(swapData *marketdata.SwapEventData, fee uint32) (amountInUSD, amountOutUSD, feeUSD float64) {
	if s.profitCalculator == nil {
		return 0, 0, 0
	}

	// Get token prices in USD
	token0Price := s.getTokenPriceUSD(swapData.Token0)
	token1Price := s.getTokenPriceUSD(swapData.Token1)

	// Calculate decimals for proper conversion
	token0Decimals := s.getTokenDecimals(swapData.Token0)
	token1Decimals := s.getTokenDecimals(swapData.Token1)

	// Calculate amount in USD
	if swapData.Amount0In != nil && swapData.Amount0In.Sign() > 0 {
		amount0InFloat := s.bigIntToFloat(swapData.Amount0In, token0Decimals)
		amountInUSD = amount0InFloat * token0Price
	} else if swapData.Amount1In != nil && swapData.Amount1In.Sign() > 0 {
		amount1InFloat := s.bigIntToFloat(swapData.Amount1In, token1Decimals)
		amountInUSD = amount1InFloat * token1Price
	}

	// Calculate amount out USD
	if swapData.Amount0Out != nil && swapData.Amount0Out.Sign() > 0 {
		amount0OutFloat := s.bigIntToFloat(swapData.Amount0Out, token0Decimals)
		amountOutUSD = amount0OutFloat * token0Price
	} else if swapData.Amount1Out != nil && swapData.Amount1Out.Sign() > 0 {
		amount1OutFloat := s.bigIntToFloat(swapData.Amount1Out, token1Decimals)
		amountOutUSD = amount1OutFloat * token1Price
	}

	// Calculate fee USD (fee tier as percentage of input amount)
	feePercent := float64(fee) / 1000000.0 // Convert from basis points
	feeUSD = amountInUSD * feePercent

	return amountInUSD, amountOutUSD, feeUSD
}

// calculateSwapPriceImpact calculates the price impact of a swap based on pool liquidity and amounts
func (s *SwapAnalyzer) calculateSwapPriceImpact(event events.Event, swapData *marketdata.SwapEventData) float64 {
	if event.SqrtPriceX96 == nil || event.Liquidity == nil {
		return 0.0
	}

	// Get pre-swap price from sqrtPriceX96
	prePrice := s.sqrtPriceX96ToPrice(event.SqrtPriceX96)
	if prePrice == 0 {
		return 0.0
	}

	// Calculate effective swap size in token0 terms
	var swapSize *big.Int
	if swapData.Amount0In != nil && swapData.Amount0In.Sign() > 0 {
		swapSize = swapData.Amount0In
	} else if swapData.Amount0Out != nil && swapData.Amount0Out.Sign() > 0 {
		swapSize = swapData.Amount0Out
	} else {
		return 0.0
	}

	// Calculate price impact as percentage of pool liquidity
	liquidity := event.Liquidity.ToBig()
	if liquidity.Sign() == 0 {
		return 0.0
	}

	// Proper price impact calculation for AMMs: impact = swapSize / (liquidity + swapSize)
	// This is more accurate than the quadratic approximation for real AMMs
	swapSizeFloat := new(big.Float).SetInt(swapSize)
	liquidityFloat := new(big.Float).SetInt(liquidity)

	// Calculate the price impact ratio
	priceImpactRatio := new(big.Float).Quo(swapSizeFloat, new(big.Float).Add(liquidityFloat, swapSizeFloat))

	// Convert to percentage
	priceImpactPercent, _ := priceImpactRatio.Float64()
	return priceImpactPercent * 100.0
}

// getTokenPriceUSD gets the USD price of a token using various price sources
func (s *SwapAnalyzer) getTokenPriceUSD(tokenAddr common.Address) float64 {
	if price, exists := scannercommon.GetTokenPriceUSD(tokenAddr); exists {
		return price
	}
	// For unknown tokens, return 0 (in production, would query price oracle or DEX)
	return 0.0
}

// getTokenDecimals returns the decimal places for a token
func (s *SwapAnalyzer) getTokenDecimals(tokenAddr common.Address) uint8 {
	if decimals, exists := scannercommon.GetTokenDecimals(tokenAddr); exists {
		return decimals
	}
	// Default to 18 for unknown tokens
	return 18
}

// bigIntToFloat converts a big.Int amount to float64 accounting for token decimals
func (s *SwapAnalyzer) bigIntToFloat(amount *big.Int, decimals uint8) float64 {
	if amount == nil {
		return 0.0
	}

	divisor := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(decimals)), nil)
	amountFloat := new(big.Float).SetInt(amount)
	divisorFloat := new(big.Float).SetInt(divisor)

	result := new(big.Float).Quo(amountFloat, divisorFloat)
	resultFloat, _ := result.Float64()

	return resultFloat
}

// sqrtPriceX96ToPrice converts sqrtPriceX96 to a regular price using cached mathematical functions
func (s *SwapAnalyzer) sqrtPriceX96ToPrice(sqrtPriceX96 *uint256.Int) float64 {
	if sqrtPriceX96 == nil {
		return 0.0
	}

	// Use cached function for optimized calculation
	price := uniswap.SqrtPriceX96ToPriceCached(sqrtPriceX96.ToBig())

	priceFloat, _ := price.Float64()
	return priceFloat
}

func canonicalProtocolName(raw string) string {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return ""
	}
	lower := strings.ToLower(raw)
	if idx := strings.Index(lower, "_fee"); idx != -1 {
		lower = lower[:idx]
	}
	replacer := strings.NewReplacer(" ", "", "-", "", ".", "", ":", "")
	lower = replacer.Replace(lower)
	lower = strings.ReplaceAll(lower, "_", "")

	switch {
	case strings.Contains(lower, "kyberelastic"):
		return "KyberElastic"
	case strings.Contains(lower, "kyberclassic"):
		return "KyberClassic"
	case strings.Contains(lower, "kyberswap"):
		return "Kyber"
	case strings.Contains(lower, "kyber"):
		return "Kyber"
	case strings.Contains(lower, "balancer"):
		return "Balancer"
	case strings.Contains(lower, "curve"):
		return "Curve"
	case strings.Contains(lower, "camelot"):
		return "Camelot"
	case strings.Contains(lower, "traderjoe"):
		return "TraderJoe"
	case strings.Contains(lower, "sushiswap") || strings.Contains(lower, "sushi"):
		return "SushiSwap"
	case strings.Contains(lower, "pancake"):
		return "PancakeSwap"
	case strings.Contains(lower, "ramses"):
		return "Ramses"
	case strings.Contains(lower, "uniswap") && strings.Contains(lower, "v3"):
		return "UniswapV3"
	case strings.Contains(lower, "uniswap") && strings.Contains(lower, "v2"):
		return "UniswapV2"
	case strings.Contains(lower, "uniswap"):
		return "Uniswap"
	}

	return strings.Title(strings.ReplaceAll(raw, "_", ""))
}

func protocolFromFactory(factory common.Address) string {
	if factory == (common.Address{}) {
		return ""
	}
	if protocol, ok := factoryProtocolMap[factory]; ok {
		return protocol
	}
	return ""
}

func factoryForProtocol(protocol string) common.Address {
	canonical := canonicalProtocolName(protocol)
	if canonical == "" {
		return common.Address{}
	}
	if addr, ok := protocolDefaultFactory[canonical]; ok {
		return addr
	}
	return common.Address{}
}

func (s *SwapAnalyzer) resolveFactory(existing common.Address, protocol string, marketScanner *market.MarketScanner) common.Address {
	if existing != (common.Address{}) {
		return existing
	}
	if addr := factoryForProtocol(protocol); addr != (common.Address{}) {
		return addr
	}
	if marketScanner != nil {
		if addr := marketScanner.GetFactoryForProtocol(protocol); addr != (common.Address{}) {
			return addr
		}
	}
	return existing
}

func (s *SwapAnalyzer) detectSwapProtocol(event events.Event, poolInfo *marketdata.PoolInfo, poolData *market.CachedData, factory common.Address) string {
	candidates := []string{event.Protocol}

	if poolInfo != nil {
		candidates = append(candidates, poolInfo.Protocol)
		if factory == (common.Address{}) && poolInfo.Factory != (common.Address{}) {
			factory = poolInfo.Factory
		}
	}

	if poolData != nil {
		candidates = append(candidates, poolData.Protocol)
	}

	if proto := protocolFromFactory(factory); proto != "" {
		candidates = append(candidates, proto)
	}

	for _, candidate := range candidates {
		if canonical := canonicalProtocolName(candidate); canonical != "" && !strings.EqualFold(canonical, "unknown") {
			return canonical
		}
	}

	if proto, ok := protocolSpecialByAddress[event.PoolAddress]; ok {
		return proto
	}

	return "Unknown"
}