package arbitrum

import (
	"context"
	"fmt"
	"sync"
	"time"

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

	"github.com/fraktal/mev-beta/internal/logger"
	"github.com/fraktal/mev-beta/pkg/arbitrum/discovery"
)

// MarketDiscoveryManager is the main market discovery manager that coordinates all submodules
type MarketDiscoveryManager struct {
	marketDiscovery *discovery.MarketDiscovery
	// Add other submodules as needed
	logger *logger.Logger
	config *discovery.MarketConfig
	client *ethclient.Client

	// Incremental scanning state
	lastScannedBlock uint64
	maxBlocksPerScan uint64
	scanInterval     time.Duration
	stopChan         chan struct{}
	isScanning       bool
	scanMu           sync.Mutex
}

// NewMarketDiscoveryManager creates a new market discovery manager
func NewMarketDiscoveryManager(client *ethclient.Client, logger *logger.Logger, configPath string) (*MarketDiscoveryManager, error) {
	// Wrap client with rate limiting
	rateLimitedClient := NewRateLimitedClient(client, 10.0, logger) // 10 requests per second default

	md, err := discovery.NewMarketDiscovery(rateLimitedClient.Client, logger, configPath)
	if err != nil {
		return nil, fmt.Errorf("failed to create market discovery: %w", err)
	}

	manager := &MarketDiscoveryManager{
		marketDiscovery:  md,
		logger:           logger,
		client:           rateLimitedClient.Client,
		maxBlocksPerScan: 1000,             // Default to 1000 blocks per scan
		scanInterval:     30 * time.Second, // Default to 30 seconds between scans
		stopChan:         make(chan struct{}),
	}

	// Load the config to make it available
	config, err := discovery.LoadMarketConfig(configPath)
	if err != nil {
		return nil, fmt.Errorf("failed to load config: %w", err)
	}
	manager.config = config

	return manager, nil
}

// DiscoverPools discovers pools from factories within a block range
func (mdm *MarketDiscoveryManager) DiscoverPools(ctx context.Context, fromBlock, toBlock uint64) (*discovery.PoolDiscoveryResult, error) {
	return mdm.marketDiscovery.DiscoverPools(ctx, fromBlock, toBlock)
}

// ScanForArbitrage scans all pools for arbitrage opportunities
func (mdm *MarketDiscoveryManager) ScanForArbitrage(ctx context.Context, blockNumber uint64) (*discovery.MarketScanResult, error) {
	return mdm.marketDiscovery.ScanForArbitrage(ctx, blockNumber)
}

// BuildComprehensiveMarkets builds comprehensive markets for all exchanges and top tokens
func (mdm *MarketDiscoveryManager) BuildComprehensiveMarkets() error {
	return mdm.marketDiscovery.BuildComprehensiveMarkets()
}

// StartIncrementalScanning starts incremental block scanning for new pools
func (mdm *MarketDiscoveryManager) StartIncrementalScanning(ctx context.Context) error {
	mdm.scanMu.Lock()
	if mdm.isScanning {
		mdm.scanMu.Unlock()
		return fmt.Errorf("incremental scanning already running")
	}
	mdm.isScanning = true
	mdm.scanMu.Unlock()

	mdm.logger.Info("🔄 Starting incremental market discovery scanning")

	// Get the current block number to start scanning from
	currentBlock, err := mdm.client.BlockNumber(ctx)
	if err != nil {
		return fmt.Errorf("failed to get current block number: %w", err)
	}

	// Set the last scanned block to current block minus a small buffer
	// This prevents scanning too far back and missing recent blocks
	mdm.lastScannedBlock = currentBlock - 10

	go mdm.runIncrementalScanning(ctx)

	return nil
}

// runIncrementalScanning runs the incremental scanning loop
func (mdm *MarketDiscoveryManager) runIncrementalScanning(ctx context.Context) {
	ticker := time.NewTicker(mdm.scanInterval)
	defer ticker.Stop()

	for {
		select {
		case <-ctx.Done():
			mdm.scanMu.Lock()
			mdm.isScanning = false
			mdm.scanMu.Unlock()
			return
		case <-mdm.stopChan:
			mdm.scanMu.Lock()
			mdm.isScanning = false
			mdm.scanMu.Unlock()
			return
		case <-ticker.C:
			if err := mdm.performIncrementalScan(ctx); err != nil {
				mdm.logger.Error(fmt.Sprintf("Incremental scan failed: %v", err))
			}
		}
	}
}

// performIncrementalScan performs a single incremental scan
func (mdm *MarketDiscoveryManager) performIncrementalScan(ctx context.Context) error {
	// Get the current block number
	currentBlock, err := mdm.client.BlockNumber(ctx)
	if err != nil {
		return fmt.Errorf("failed to get current block number: %w", err)
	}

	// Calculate the range to scan
	fromBlock := mdm.lastScannedBlock + 1
	toBlock := currentBlock

	// Limit the scan range to prevent overwhelming the RPC
	if toBlock-fromBlock > mdm.maxBlocksPerScan {
		toBlock = fromBlock + mdm.maxBlocksPerScan - 1
	}

	// If there are no new blocks to scan, return early
	if fromBlock > toBlock {
		return nil
	}

	mdm.logger.Info(fmt.Sprintf("🔍 Performing incremental scan: blocks %d to %d", fromBlock, toBlock))

	// Discover pools in the range
	result, err := mdm.marketDiscovery.DiscoverPools(ctx, fromBlock, toBlock)
	if err != nil {
		return fmt.Errorf("failed to discover pools: %w", err)
	}

	// Log the results
	if result.PoolsFound > 0 {
		mdm.logger.Info(fmt.Sprintf("🆕 Discovered %d new pools in blocks %d-%d", result.PoolsFound, fromBlock, toBlock))
		for _, pool := range result.NewPools {
			// Handle empty addresses to prevent slice bounds panic
			poolAddrDisplay := "unknown"
			if len(pool.Address.Hex()) > 0 {
				if len(pool.Address.Hex()) > 8 {
					poolAddrDisplay = pool.Address.Hex()[:8]
				} else {
					poolAddrDisplay = pool.Address.Hex()
				}
			} else {
				// Handle completely empty address
				poolAddrDisplay = "unknown"
			}

			// Handle empty factory addresses to prevent slice bounds panic
			factoryAddrDisplay := "unknown"
			if len(pool.Factory.Hex()) > 0 {
				if len(pool.Factory.Hex()) > 8 {
					factoryAddrDisplay = pool.Factory.Hex()[:8]
				} else {
					factoryAddrDisplay = pool.Factory.Hex()
				}
			} else {
				// Handle completely empty address
				factoryAddrDisplay = "unknown"
			}

			mdm.logger.Info(fmt.Sprintf("  🏦 Pool %s (factory %s, tokens %s-%s)",
				poolAddrDisplay,
				factoryAddrDisplay,
				pool.Token0.Hex()[:6],
				pool.Token1.Hex()[:6]))
		}
	}

	// Update the last scanned block
	mdm.lastScannedBlock = toBlock

	return nil
}

// StopIncrementalScanning stops the incremental scanning
func (mdm *MarketDiscoveryManager) StopIncrementalScanning() error {
	mdm.scanMu.Lock()
	defer mdm.scanMu.Unlock()

	if !mdm.isScanning {
		return fmt.Errorf("incremental scanning not running")
	}

	close(mdm.stopChan)
	mdm.isScanning = false
	return nil
}

// SetMaxBlocksPerScan sets the maximum number of blocks to scan in a single increment
func (mdm *MarketDiscoveryManager) SetMaxBlocksPerScan(maxBlocks uint64) {
	mdm.scanMu.Lock()
	defer mdm.scanMu.Unlock()
	mdm.maxBlocksPerScan = maxBlocks
}

// SetScanInterval sets the interval between incremental scans
func (mdm *MarketDiscoveryManager) SetScanInterval(interval time.Duration) {
	mdm.scanMu.Lock()
	defer mdm.scanMu.Unlock()
	mdm.scanInterval = interval
}

// GetLastScannedBlock returns the last block that was scanned
func (mdm *MarketDiscoveryManager) GetLastScannedBlock() uint64 {
	mdm.scanMu.Lock()
	defer mdm.scanMu.Unlock()
	return mdm.lastScannedBlock
}

// GetStatistics returns market discovery statistics
func (mdm *MarketDiscoveryManager) GetStatistics() map[string]interface{} {
	return mdm.marketDiscovery.GetStatistics()
}

// GetPoolCache returns the pool cache for external use
func (mdm *MarketDiscoveryManager) GetPoolCache() interface{} {
	// This is a simplified implementation - in practice, you'd want to return
	// a proper pool cache or create one from the current pools
	return &PoolCache{
		pools:     make(map[common.Address]*CachedPoolInfo),
		cacheLock: sync.RWMutex{},
		maxSize:   10000,
		ttl:       time.Hour,
	}
}

// StartFactoryEventMonitoring begins real-time monitoring of factory events for new pool discovery
func (mdm *MarketDiscoveryManager) StartFactoryEventMonitoring(ctx context.Context, client *ethclient.Client) error {
	mdm.logger.Info("🏭 Starting real-time factory event monitoring")

	// Create event subscriptions for each factory
	// This would require access to the factory information in the market discovery
	// For now, we'll just log that this functionality exists

	go mdm.monitorFactoryEvents(ctx, client)

	return nil
}

// monitorFactoryEvents continuously monitors factory events for new pool creation
func (mdm *MarketDiscoveryManager) monitorFactoryEvents(ctx context.Context, client *ethclient.Client) {
	// This would be implemented to monitor factory events
	// For now, it's a placeholder
	ticker := time.NewTicker(30 * time.Second)
	defer ticker.Stop()

	for {
		select {
		case <-ctx.Done():
			return
		case <-ticker.C:
			// In a real implementation, this would check for new pools
			// For now, just log that monitoring is running
			mdm.logger.Debug("Factory event monitoring tick")
		}
	}
}

// Close closes all log files and resources
func (mdm *MarketDiscoveryManager) Close() error {
	return nil // No resources to close in this simplified version
}