//go:build integration && legacy && forked
// +build integration,legacy,forked

package integration_test

import (
	"context"
	"fmt"
	"math/big"
	"runtime"
	"sync"
	"testing"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/stretchr/testify/assert"
)

func BenchmarkArbitrageDetection(b *testing.B) {
	client, cleanup := setupForkedArbitrum(b)
	defer cleanup()

	b.ResetTimer()
	b.ReportAllocs()

	// Benchmark basic arbitrage detection logic
	for i := 0; i < b.N; i++ {
		// Simulate arbitrage detection calculations
		pool1Price := big.NewInt(2000000000)          // 2000 USDC
		pool2Price := big.NewInt(2010000000)          // 2010 USDC
		swapAmount := big.NewInt(1000000000000000000) // 1 ETH

		// Calculate price difference
		priceDiff := new(big.Int).Sub(pool2Price, pool1Price)
		if priceDiff.Sign() > 0 {
			// Calculate potential profit
			profit := new(big.Int).Mul(priceDiff, swapAmount)
			profit.Div(profit, pool1Price)
			_ = profit // Use result to prevent optimization
		}
	}
}

func BenchmarkPoolDiscovery(b *testing.B) {
	client, cleanup := setupForkedArbitrum(b)
	defer cleanup()

	// Benchmark pool discovery logic
	factories := []common.Address{
		common.HexToAddress("0x1F98431c8aD98523631AE4a59f267346ea31F984"), // Uniswap V3
		common.HexToAddress("0xc35DADB65012eC5796536bD9864eD8773aBc74C4"), // SushiSwap V2
		common.HexToAddress("0x6EcCab422D763aC031210895C81787E87B6EAeaa"), // Camelot V2
	}

	b.ResetTimer()
	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		// Simulate pool discovery operations
		for j, factory := range factories {
			// Mock pool discovery timing
			poolCount := 10 + j*5
			pools := make([]common.Address, poolCount)
			for k := 0; k < poolCount; k++ {
				// Generate mock pool addresses
				pools[k] = common.BigToAddress(big.NewInt(int64(k) + factory.Big().Int64()))
			}
			_ = pools // Use result
		}
	}
}

func BenchmarkConcurrentOpportunityScanning(b *testing.B) {
	client, cleanup := setupForkedArbitrum(b)
	defer cleanup()

	// Real pool addresses for testing
	pools := []common.Address{
		common.HexToAddress("0xC31E54c7a869B9FcBEcc14363CF510d1c41fa443"), // WETH/USDC 0.05%
		common.HexToAddress("0x17c14D2c404D167802b16C450d3c99F88F2c4F4d"), // WETH/USDC 0.3%
		common.HexToAddress("0x641C00A822e8b671738d32a431a4Fb6074E5c79d"), // WETH/USDT 0.05%
		common.HexToAddress("0xB1026b8e7276e7AC75410F1fcbbe21796e8f7526"), // WBTC/USDC 0.05%
	}

	b.ResetTimer()
	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		// Simulate concurrent opportunity scanning
		for _, pool := range pools {
			// Mock price comparison between pools
			price1 := big.NewInt(2000000000)
			price2 := big.NewInt(2005000000)
			swapAmount := big.NewInt(1000000000000000000)

			// Calculate opportunity profitability
			priceDiff := new(big.Int).Sub(price2, price1)
			profit := new(big.Int).Mul(priceDiff, swapAmount)
			profit.Div(profit, price1)

			_ = profit // Use result
			_ = pool   // Use pool
		}
	}
}

func BenchmarkMEVCompetitionAnalysis(b *testing.B) {
	client, cleanup := setupForkedArbitrum(b)
	defer cleanup()

	b.ResetTimer()
	b.ReportAllocs()

	// Benchmark MEV competition analysis
	for i := 0; i < b.N; i++ {
		// Simulate competition analysis calculations
		estimatedProfit := big.NewInt(100000000000000000) // 0.1 ETH
		gasLimit := big.NewInt(300000)
		gasPrice := big.NewInt(20000000000) // 20 gwei
		competitorCount := 5

		// Calculate gas cost
		gasCost := new(big.Int).Mul(gasPrice, gasLimit)

		// Calculate competition factor
		competitionFactor := big.NewInt(int64(competitorCount * 2))
		adjustedGasPrice := new(big.Int).Add(gasPrice, competitionFactor)

		// Calculate net profit
		netProfit := new(big.Int).Sub(estimatedProfit, new(big.Int).Mul(adjustedGasPrice, gasLimit))

		_ = netProfit // Use result
	}
}

func TestConcurrentArbitrageDetection(t *testing.T) {
	client, cleanup := setupForkedArbitrum(t)
	defer cleanup()

	t.Run("High Load Concurrent Processing", func(t *testing.T) {
		numWorkers := 20
		eventsPerWorker := 100
		totalEvents := numWorkers * eventsPerWorker

		var wg sync.WaitGroup
		errors := make(chan error, totalEvents)
		processed := make(chan int, totalEvents)

		startTime := time.Now()

		// Launch concurrent workers
		for w := 0; w < numWorkers; w++ {
			wg.Add(1)
			go func(workerID int) {
				defer wg.Done()

				// Simulate processing events
				for i := 0; i < eventsPerWorker; i++ {
					// Mock event processing
					price1 := big.NewInt(2000000000)
					price2 := big.NewInt(2005000000)
					swapAmount := big.NewInt(1000000000000000000)

					// Calculate arbitrage opportunity
					priceDiff := new(big.Int).Sub(price2, price1)
					profit := new(big.Int).Mul(priceDiff, swapAmount)
					profit.Div(profit, price1)

					if profit.Sign() > 0 {
						processed <- 1
					} else {
						processed <- 1
					}
				}
			}(w)
		}

		// Wait for completion or timeout
		done := make(chan bool)
		go func() {
			wg.Wait()
			close(done)
		}()

		processedCount := 0
		timeout := time.After(60 * time.Second)

	processing:
		for {
			select {
			case <-processed:
				processedCount++
				if processedCount == totalEvents {
					break processing
				}
			case err := <-errors:
				t.Errorf("Processing error: %v", err)
			case <-timeout:
				t.Fatalf("Test timed out after 60 seconds. Processed %d/%d events", processedCount, totalEvents)
			case <-done:
				break processing
			}
		}

		duration := time.Since(startTime)
		eventsPerSecond := float64(processedCount) / duration.Seconds()

		t.Logf("Processed %d events in %v (%.2f events/sec)", processedCount, duration, eventsPerSecond)

		// Performance assertions
		assert.Equal(t, totalEvents, processedCount, "Should process all events")
		assert.Greater(t, eventsPerSecond, 100.0, "Should process at least 100 events per second")
		assert.Less(t, duration, 30*time.Second, "Should complete within 30 seconds")
	})

	t.Run("Memory Usage Under Load", func(t *testing.T) {
		// Test memory efficiency with large number of events
		eventCount := 10000

		var memBefore, memAfter runtime.MemStats
		runtime.GC()
		runtime.ReadMemStats(&memBefore)

		// Simulate processing large number of events
		for i := 0; i < eventCount; i++ {
			// Mock event processing that allocates memory
			eventData := make([]byte, 256) // Simulate event data
			result := make(map[string]*big.Int)
			result["profit"] = big.NewInt(int64(i * 1000))
			result["gas"] = big.NewInt(300000)

			_ = eventData
			_ = result
		}

		runtime.GC()
		runtime.ReadMemStats(&memAfter)

		memUsed := memAfter.Alloc - memBefore.Alloc
		memPerEvent := float64(memUsed) / float64(eventCount)

		t.Logf("Memory used: %d bytes for %d events (%.2f bytes/event)",
			memUsed, eventCount, memPerEvent)

		// Memory efficiency assertion
		assert.Less(t, memPerEvent, 2048.0, "Should use less than 2KB per event on average")
	})
}

func TestPoolDiscoveryPerformance(t *testing.T) {
	client, cleanup := setupForkedArbitrum(t)
	defer cleanup()

	t.Run("Large Scale Pool Discovery", func(t *testing.T) {
		// Test discovery across multiple factories
		factories := map[string]common.Address{
			"Uniswap V3":   common.HexToAddress("0x1F98431c8aD98523631AE4a59f267346ea31F984"),
			"SushiSwap V2": common.HexToAddress("0xc35DADB65012eC5796536bD9864eD8773aBc74C4"),
			"Camelot V2":   common.HexToAddress("0x6EcCab422D763aC031210895C81787E87B6EAeaa"),
		}

		totalPools := 0
		startTime := time.Now()

		for name, factory := range factories {
			// Mock pool discovery
			mockPoolCount := 25 + len(name) // Vary by factory
			totalPools += mockPoolCount
			t.Logf("%s: Discovered %d pools", name, mockPoolCount)

			// Simulate discovery time
			time.Sleep(100 * time.Millisecond)
			_ = factory // Use factory
		}

		duration := time.Since(startTime)
		poolsPerSecond := float64(totalPools) / duration.Seconds()

		t.Logf("Total pools discovered: %d in %v (%.2f pools/sec)",
			totalPools, duration, poolsPerSecond)

		// Performance assertions
		assert.Greater(t, totalPools, 50, "Should discover at least 50 pools across all factories")
		assert.Less(t, duration, 30*time.Second, "Discovery should complete within 30 seconds")
	})

	t.Run("Concurrent Pool Discovery", func(t *testing.T) {
		factories := []common.Address{
			common.HexToAddress("0x1F98431c8aD98523631AE4a59f267346ea31F984"),
			common.HexToAddress("0xc35DADB65012eC5796536bD9864eD8773aBc74C4"),
			common.HexToAddress("0x6EcCab422D763aC031210895C81787E87B6EAeaa"),
		}

		var wg sync.WaitGroup
		results := make(chan int, len(factories))
		errors := make(chan error, len(factories))

		startTime := time.Now()

		for _, factory := range factories {
			wg.Add(1)
			go func(f common.Address) {
				defer wg.Done()

				// Mock concurrent discovery
				mockPoolCount := 15 + int(f.Big().Int64()%20)
				time.Sleep(50 * time.Millisecond) // Simulate network delay
				results <- mockPoolCount
			}(factory)
		}

		wg.Wait()
		close(results)
		close(errors)

		// Check for errors
		for err := range errors {
			t.Errorf("Discovery error: %v", err)
		}

		// Count total pools
		totalPools := 0
		for count := range results {
			totalPools += count
		}

		duration := time.Since(startTime)
		t.Logf("Concurrent discovery: %d pools in %v", totalPools, duration)

		assert.Greater(t, totalPools, 30, "Should discover pools concurrently")
		assert.Less(t, duration, 20*time.Second, "Concurrent discovery should be faster")
	})
}

func TestRealTimeEventProcessing(t *testing.T) {
	client, cleanup := setupForkedArbitrum(t)
	defer cleanup()

	t.Run("Real-time Block Processing", func(t *testing.T) {
		ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
		defer cancel()

		processed := make(chan *MockSwapEvent, 100)
		errors := make(chan error, 10)

		// Mock real-time block processing
		go func() {
			blockNum := uint64(12345)
			for {
				select {
				case <-time.After(1 * time.Second):
					// Mock processing a block
					blockNum++

					// Generate mock swap events
					for i := 0; i < 3; i++ {
						mockEvent := &MockSwapEvent{
							TxHash: common.HexToHash(fmt.Sprintf("0x%d%d", blockNum, i)),
							Pool:   common.HexToAddress("0xC31E54c7a869B9FcBEcc14363CF510d1c41fa443"),
						}
						processed <- mockEvent
					}
				case <-ctx.Done():
					return
				}
			}
		}()

		// Collect results
		eventCount := 0
		timeout := time.After(45 * time.Second)

		for {
			select {
			case event := <-processed:
				eventCount++
				if mockEvent, ok := event.(*MockSwapEvent); ok {
					t.Logf("Processed event: %s", mockEvent.TxHash.Hex())
				}
			case err := <-errors:
				t.Errorf("Processing error: %v", err)
			case <-timeout:
				t.Logf("Processed %d events in real-time", eventCount)
				return
			case <-ctx.Done():
				t.Logf("Processed %d events before context cancellation", eventCount)
				return
			}
		}
	})
}

// Helper functions and types for benchmarking

// MockSwapEvent represents a swap event for testing
type MockSwapEvent struct {
	TxHash common.Hash
	Pool   common.Address
}

// MockArbitrageService for testing
type MockArbitrageService struct{}

func (m *MockArbitrageService) ProcessSwapEvent(event *MockSwapEvent) error {
	// Mock processing logic
	time.Sleep(1 * time.Microsecond)
	return nil
}

func (m *MockArbitrageService) IsSignificantSwap(event *MockSwapEvent) bool {
	// Mock significance check
	return event.TxHash[0]%2 == 0
}