package analysis

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

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

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

// LiquidityAnalyzer handles analysis of liquidity events
type LiquidityAnalyzer struct {
	logger           *logger.Logger
	marketDataLogger *marketdata.MarketDataLogger
}

// NewLiquidityAnalyzer creates a new liquidity analyzer
func NewLiquidityAnalyzer(logger *logger.Logger, marketDataLogger *marketdata.MarketDataLogger) *LiquidityAnalyzer {
	return &LiquidityAnalyzer{
		logger:           logger,
		marketDataLogger: marketDataLogger,
	}
}

// AnalyzeLiquidityEvent analyzes liquidity events (add/remove)
func (l *LiquidityAnalyzer) AnalyzeLiquidityEvent(event events.Event, marketScanner *market.MarketScanner, isAdd bool) {
	action := "adding"
	eventType := "mint"
	if !isAdd {
		action = "removing"
		eventType = "burn"
	}
	l.logger.Debug(fmt.Sprintf("Analyzing liquidity event (%s) in pool %s", action, event.PoolAddress))

	// Get comprehensive pool data to determine factory
	poolInfo, poolExists := l.marketDataLogger.GetPoolInfo(event.PoolAddress)
	factory := common.Address{}
	if poolExists {
		factory = poolInfo.Factory
	} else {
		// Determine factory from known DEX protocols
		factory = marketScanner.GetFactoryForProtocol(event.Protocol)
	}

	// Create comprehensive liquidity event data for market data logger
	liquidityData := &marketdata.LiquidityEventData{
		TxHash:      event.TransactionHash,
		BlockNumber: event.BlockNumber,
		LogIndex:    uint(0), // Default log index (would need to be extracted from receipt)
		Timestamp:   time.Now(),
		EventType:   eventType,
		PoolAddress: event.PoolAddress,
		Factory:     factory,
		Protocol:    event.Protocol,
		Token0:      event.Token0,
		Token1:      event.Token1,
		Amount0:     event.Amount0,
		Amount1:     event.Amount1,
		Liquidity:   event.Liquidity,
		Owner:       common.Address{}, // Default owner (would need to be extracted from transaction)
		Recipient:   common.Address{}, // Default recipient (would need to be extracted from transaction)
	}

	// Calculate USD values for liquidity amounts
	liquidityData.Amount0USD, liquidityData.Amount1USD, liquidityData.TotalUSD = l.calculateLiquidityUSDValues(liquidityData)

	// Log comprehensive liquidity event to market data logger
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := l.marketDataLogger.LogLiquidityEvent(ctx, event, liquidityData); err != nil {
		l.logger.Debug(fmt.Sprintf("Failed to log liquidity event to market data logger: %v", err))
	}

	// Log the liquidity event to database (legacy)
	marketScanner.LogLiquidityEvent(event, eventType)

	// Update cached pool data
	marketScanner.UpdatePoolData(event)

	l.logger.Info(fmt.Sprintf("Liquidity %s event processed for pool %s", action, event.PoolAddress))
}

// AnalyzeNewPoolEvent analyzes new pool creation events
func (l *LiquidityAnalyzer) AnalyzeNewPoolEvent(event events.Event, marketScanner *market.MarketScanner) {
	l.logger.Info(fmt.Sprintf("New pool created: %s (protocol: %s)", event.PoolAddress, event.Protocol))

	// Add to known pools by fetching and caching the pool data
	l.logger.Debug(fmt.Sprintf("Adding new pool %s to monitoring", event.PoolAddress))

	// Fetch pool data to validate it's a real pool
	poolData, err := marketScanner.GetPoolData(event.PoolAddress.Hex())
	if err != nil {
		l.logger.Error(fmt.Sprintf("Failed to fetch data for new pool %s: %v", event.PoolAddress, err))
		return
	}

	// Validate that this is a real pool contract
	if poolData.Address == (common.Address{}) {
		l.logger.Warn(fmt.Sprintf("Invalid pool contract at address %s", event.PoolAddress.Hex()))
		return
	}

	// Log pool data to database
	marketScanner.LogPoolData(poolData)

	l.logger.Info(fmt.Sprintf("Successfully added new pool %s to monitoring (tokens: %s-%s, fee: %d)",
		event.PoolAddress.Hex(), poolData.Token0.Hex(), poolData.Token1.Hex(), poolData.Fee))
}

// calculateLiquidityUSDValues calculates USD values for liquidity event amounts
func (l *LiquidityAnalyzer) calculateLiquidityUSDValues(liquidityData *marketdata.LiquidityEventData) (amount0USD, amount1USD, totalUSD float64) {
	// Get token prices in USD (using a simplified approach)
	token0Price := l.getTokenPriceUSD(liquidityData.Token0)
	token1Price := l.getTokenPriceUSD(liquidityData.Token1)

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

	// Calculate amount0 USD
	if liquidityData.Amount0 != nil {
		amount0Float := l.bigIntToFloat(liquidityData.Amount0, token0Decimals)
		amount0USD = amount0Float * token0Price
	}

	// Calculate amount1 USD
	if liquidityData.Amount1 != nil {
		amount1Float := l.bigIntToFloat(liquidityData.Amount1, token1Decimals)
		amount1USD = amount1Float * token1Price
	}

	// Total USD value
	totalUSD = amount0USD + amount1USD

	return amount0USD, amount1USD, totalUSD
}

// getTokenPriceUSD gets the USD price of a token using various price sources
func (l *LiquidityAnalyzer) 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 (l *LiquidityAnalyzer) 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 (l *LiquidityAnalyzer) 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
}