package scanner

import (
	"fmt"
	"sync"

	"github.com/ethereum/go-ethereum/common"
	"github.com/fraktal/mev-beta/internal/config"
	"github.com/fraktal/mev-beta/internal/logger"
	"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/profitcalc"
	"github.com/fraktal/mev-beta/pkg/scanner/analysis"
	"github.com/fraktal/mev-beta/pkg/scanner/market"
	"github.com/fraktal/mev-beta/pkg/scanner/swap"
)

// Scanner is the main market scanner that handles event processing
type Scanner struct {
	marketScanner     *market.MarketScanner
	swapAnalyzer      *swap.SwapAnalyzer
	liquidityAnalyzer *analysis.LiquidityAnalyzer
	config            *config.BotConfig
	logger            *logger.Logger
	workerPool        chan chan events.Event
	workers           []*EventWorker
	wg                sync.WaitGroup
}

// 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    *Scanner
}

// NewScanner creates a new market scanner with concurrency support
func NewScanner(cfg *config.BotConfig, logger *logger.Logger, contractExecutor *contracts.ContractExecutor, db *database.Database) *Scanner {
	scanner := &Scanner{
		config:     cfg,
		logger:     logger,
		workerPool: make(chan chan events.Event, cfg.MaxWorkers),
		workers:    make([]*EventWorker, 0, cfg.MaxWorkers),
	}

	// Initialize the market scanner
	marketScanner := market.NewMarketScanner(cfg, logger, contractExecutor, db)
	scanner.marketScanner = marketScanner

	// Initialize the swap analyzer
	swapAnalyzer := swap.NewSwapAnalyzer(
		logger,
		marketScanner.GetMarketDataLogger(),
		marketScanner.GetProfitCalculator(),
		marketScanner.GetOpportunityRanker(),
	)
	scanner.swapAnalyzer = swapAnalyzer

	// Initialize the liquidity analyzer
	liquidityAnalyzer := analysis.NewLiquidityAnalyzer(
		logger,
		marketScanner.GetMarketDataLogger(),
	)
	scanner.liquidityAnalyzer = liquidityAnalyzer

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

	return scanner
}

// NewEventWorker creates a new event worker
func NewEventWorker(id int, workerPool chan chan events.Event, scanner *Scanner) *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.swapAnalyzer.AnalyzeSwapEvent(event, w.scanner.marketScanner)
		case events.AddLiquidity:
			w.scanner.liquidityAnalyzer.AnalyzeLiquidityEvent(event, w.scanner.marketScanner, true)
		case events.RemoveLiquidity:
			w.scanner.liquidityAnalyzer.AnalyzeLiquidityEvent(event, w.scanner.marketScanner, false)
		case events.NewPool:
			w.scanner.liquidityAnalyzer.AnalyzeNewPoolEvent(event, w.scanner.marketScanner)
		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 *Scanner) SubmitEvent(event events.Event) {
	s.wg.Add(1)

	// 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 *Scanner) GetTopOpportunities(limit int) []*profitcalc.RankedOpportunity {
	return s.marketScanner.GetTopOpportunities(limit)
}

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

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

// GetMarketDataStats returns comprehensive market data statistics
func (s *Scanner) GetMarketDataStats() map[string]interface{} {
	return s.marketScanner.GetMarketDataStats()
}

// GetCachedTokenInfo returns information about a cached token
func (s *Scanner) GetCachedTokenInfo(tokenAddr common.Address) (*marketdata.TokenInfo, bool) {
	return s.marketScanner.GetCachedTokenInfo(tokenAddr)
}

// GetCachedPoolInfo returns information about a cached pool
func (s *Scanner) GetCachedPoolInfo(poolAddr common.Address) (*marketdata.PoolInfo, bool) {
	return s.marketScanner.GetCachedPoolInfo(poolAddr)
}

// GetPoolsForTokenPair returns all cached pools for a token pair
func (s *Scanner) GetPoolsForTokenPair(token0, token1 common.Address) []*marketdata.PoolInfo {
	return s.marketScanner.GetPoolsForTokenPair(token0, token1)
}

// GetActiveFactories returns all active DEX factories
func (s *Scanner) GetActiveFactories() []*marketdata.FactoryInfo {
	return s.marketScanner.GetActiveFactories()
}

// WaitGroup returns the scanner's wait group for synchronization
func (s *Scanner) WaitGroup() *sync.WaitGroup {
	return &s.wg
}