main_test.go

package main

import (
	"bytes"
	"context"
	"flag"
	"io"
	"os"
	"strings"
	"sync"
	"testing"
	"time"

	"github.com/ja1code/quicrawl/internal/service"
)

// Helper function to reset flag.CommandLine for testing
func resetFlags() {
	flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
}

func TestMain_ServerMode(t *testing.T) {
	// Save original args and restore after test
	oldArgs := os.Args
	defer func() { os.Args = oldArgs }()

	// Test server mode
	os.Args = []string{"quicrawl", "-mode=server", "-port=0"} // Use port 0 for auto-assignment
	resetFlags()

	// Capture output
	var buf bytes.Buffer
	oldStdout := os.Stdout
	r, w, _ := os.Pipe()
	os.Stdout = w

	// Run main in a goroutine with timeout
	done := make(chan bool, 1)
	go func() {
		defer func() {
			if r := recover(); r != nil {
				// Server might panic on shutdown, which is expected in tests
				done <- true
			}
		}()

		// We can't easily test the full server startup without it blocking,
		// so we'll test the flag parsing and service creation parts
		var (
			mode = flag.String("mode", "cli", "Mode to run in: 'server' or 'cli'")
			port = flag.Int("port", 8080, "Port for HTTP server (only used in server mode)")
		)
		flag.Parse()

		// Create service instance (this part we can test)
		svc := service.New()
		if svc == nil {
			t.Error("failed to create service")
		}

		if *mode != "server" {
			t.Errorf("expected mode 'server', got %s", *mode)
		}

		if *port != 0 {
			t.Errorf("expected port 0, got %d", *port)
		}

		done <- true
	}()

	// Wait for test completion with timeout
	select {
	case <-done:
		// Test completed successfully
	case <-time.After(1 * time.Second):
		t.Error("test timed out")
	}

	// Restore stdout
	w.Close()
	os.Stdout = oldStdout
	io.Copy(&buf, r)
}

func TestMain_CLIMode(t *testing.T) {
	// Save original args and restore after test
	oldArgs := os.Args
	defer func() { os.Args = oldArgs }()

	// Test CLI mode with help command
	os.Args = []string{"quicrawl", "-mode=cli"}
	resetFlags()

	// We can test the flag parsing part
	var (
		mode = flag.String("mode", "cli", "Mode to run in: 'server' or 'cli'")
		port = flag.Int("port", 8080, "Port for HTTP server (only used in server mode)")
	)
	flag.Parse()

	// Create service instance
	svc := service.New()
	if svc == nil {
		t.Fatal("failed to create service")
	}

	if *mode != "cli" {
		t.Errorf("expected mode 'cli', got %s", *mode)
	}

	if *port != 8080 {
		t.Errorf("expected default port 8080, got %d", *port)
	}
}

func TestMain_InvalidMode(t *testing.T) {
	// Save original args and restore after test
	oldArgs := os.Args
	defer func() { os.Args = oldArgs }()

	os.Args = []string{"quicrawl", "-mode=invalid"}
	resetFlags()

	var (
		mode = flag.String("mode", "cli", "Mode to run in: 'server' or 'cli'")
	)
	flag.Parse()

	// Create service instance
	svc := service.New()
	if svc == nil {
		t.Fatal("failed to create service")
	}

	// Test the switch logic
	switch *mode {
	case "server":
		t.Error("should not reach server case")
	case "cli":
		t.Error("should not reach cli case")
	default:
		// This is the expected path for invalid mode
		if *mode != "invalid" {
			t.Errorf("expected mode 'invalid', got %s", *mode)
		}
	}
}

func TestRunServer_Function(t *testing.T) {
	// Create a service instance
	svc := service.New()

	// Test that runServer function can be called without panicking
	// We can't easily test the full server startup, but we can test the setup
	defer func() {
		if r := recover(); r != nil {
			// If there's a panic, it might be due to port binding issues in tests
			// which is acceptable for this test
		}
	}()

	// We'll test this by creating the server components manually
	// since the actual runServer function would block
	server := createTestServer(svc, 0)
	if server == nil {
		t.Error("failed to create test server")
	}
}

func TestRunCLI_Function(t *testing.T) {
	// Create a service instance
	svc := service.New()

	// Test CLI creation and basic functionality
	// We can't easily test the full CLI execution without args,
	// but we can test the setup
	cli := createTestCLI(svc)
	if cli == nil {
		t.Error("failed to create test CLI")
	}
}

// Helper functions to simulate the main function components
func createTestServer(svc *service.Service, port int) interface{} {
	// This simulates the server creation part of runServer
	// without actually starting the server
	if svc == nil {
		return nil
	}
	return "mock server" // Return something to indicate success
}

func createTestCLI(svc *service.Service) interface{} {
	// This simulates the CLI creation part of runCLI
	if svc == nil {
		return nil
	}
	return "mock cli" // Return something to indicate success
}

// Integration test that tests the main components working together
func TestMain_Integration(t *testing.T) {
	// Test service creation (core component)
	svc := service.New()
	if svc == nil {
		t.Fatal("failed to create service")
	}

	// Test that service methods work
	ctx := context.Background()

	// Test ProcessRequest
	result, err := svc.ProcessRequest(ctx, "integration test")
	if err != nil {
		t.Errorf("ProcessRequest failed: %v", err)
	}
	if !strings.Contains(result, "integration test") {
		t.Error("ProcessRequest result should contain input")
	}

	// Test GetStatus
	status := svc.GetStatus(ctx)
	if status == nil {
		t.Error("GetStatus returned nil")
	}
	if status["status"] != "running" {
		t.Error("service should be running")
	}

	// Test HealthCheck
	if err := svc.HealthCheck(ctx); err != nil {
		t.Errorf("HealthCheck failed: %v", err)
	}
}

// Test concurrent access to service (simulating server load)
func TestMain_ConcurrentAccess(t *testing.T) {
	svc := service.New()
	if svc == nil {
		t.Fatal("failed to create service")
	}

	ctx := context.Background()
	var wg sync.WaitGroup
	errors := make(chan error, 10)

	// Run multiple concurrent requests
	for i := 0; i < 10; i++ {
		wg.Add(1)
		go func(id int) {
			defer wg.Done()

			// Test ProcessRequest
			result, err := svc.ProcessRequest(ctx, "concurrent test")
			if err != nil {
				errors <- err
				return
			}
			if !strings.Contains(result, "concurrent test") {
				errors <- err
				return
			}

			// Test GetStatus
			status := svc.GetStatus(ctx)
			if status == nil {
				errors <- err
				return
			}

			// Test HealthCheck
			if err := svc.HealthCheck(ctx); err != nil {
				errors <- err
				return
			}
		}(i)
	}

	wg.Wait()
	close(errors)

	// Check for any errors
	for err := range errors {
		if err != nil {
			t.Errorf("concurrent access error: %v", err)
		}
	}
}

// Test flag parsing edge cases
func TestMain_FlagParsing(t *testing.T) {
	tests := []struct {
		name         string
		args         []string
		expectedMode string
		expectedPort int
	}{
		{
			name:         "default values",
			args:         []string{"quicrawl"},
			expectedMode: "cli",
			expectedPort: 8080,
		},
		{
			name:         "server mode with custom port",
			args:         []string{"quicrawl", "-mode=server", "-port=9090"},
			expectedMode: "server",
			expectedPort: 9090,
		},
		{
			name:         "cli mode explicit",
			args:         []string{"quicrawl", "-mode=cli"},
			expectedMode: "cli",
			expectedPort: 8080,
		},
		{
			name:         "server mode with default port",
			args:         []string{"quicrawl", "-mode=server"},
			expectedMode: "server",
			expectedPort: 8080,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// Save and restore original args
			oldArgs := os.Args
			defer func() { os.Args = oldArgs }()

			os.Args = tt.args
			resetFlags()

			var (
				mode = flag.String("mode", "cli", "Mode to run in: 'server' or 'cli'")
				port = flag.Int("port", 8080, "Port for HTTP server (only used in server mode)")
			)
			flag.Parse()

			if *mode != tt.expectedMode {
				t.Errorf("expected mode %s, got %s", tt.expectedMode, *mode)
			}

			if *port != tt.expectedPort {
				t.Errorf("expected port %d, got %d", tt.expectedPort, *port)
			}
		})
	}
}

// Test service initialization under different conditions
func TestMain_ServiceInitialization(t *testing.T) {
	// Test multiple service instances
	services := make([]*service.Service, 5)
	for i := 0; i < 5; i++ {
		services[i] = service.New()
		if services[i] == nil {
			t.Errorf("failed to create service instance %d", i)
		}
	}

	// Test that each service is independent
	ctx := context.Background()
	for i, svc := range services {
		result, err := svc.ProcessRequest(ctx, "test")
		if err != nil {
			t.Errorf("service %d ProcessRequest failed: %v", i, err)
		}
		if result == "" {
			t.Errorf("service %d returned empty result", i)
		}
	}
}

// Benchmark main function components
func BenchmarkMain_ServiceCreation(b *testing.B) {
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		svc := service.New()
		if svc == nil {
			b.Fatal("failed to create service")
		}
	}
}

func BenchmarkMain_FlagParsing(b *testing.B) {
	// Save original args
	oldArgs := os.Args
	defer func() { os.Args = oldArgs }()

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		os.Args = []string{"quicrawl", "-mode=server", "-port=8080"}
		resetFlags()

		var (
			mode = flag.String("mode", "cli", "Mode to run in: 'server' or 'cli'")
			port = flag.Int("port", 8080, "Port for HTTP server (only used in server mode)")
		)
		flag.Parse()

		// Use the values to prevent optimization
		_ = *mode
		_ = *port
	}
}

// Test environment variable handling (if any)
func TestMain_Environment(t *testing.T) {
	// Test with different environment conditions
	// This is a placeholder for any environment-specific testing

	svc := service.New()
	if svc == nil {
		t.Fatal("service creation failed in test environment")
	}

	// Test basic functionality in test environment
	ctx := context.Background()

	if err := svc.HealthCheck(ctx); err != nil {
		t.Errorf("health check failed in test environment: %v", err)
	}

	status := svc.GetStatus(ctx)
	if status["status"] != "running" {
		t.Error("service should be running in test environment")
	}
}

// Test resource cleanup
func TestMain_ResourceCleanup(t *testing.T) {
	// Test that resources are properly cleaned up
	svc := service.New()
	if svc == nil {
		t.Fatal("failed to create service")
	}

	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
	defer cancel()

	// Perform some operations
	_, err := svc.ProcessRequest(ctx, "cleanup test")
	if err != nil {
		t.Errorf("ProcessRequest failed: %v", err)
	}

	// Cancel context and ensure graceful handling
	cancel()

	// Try to use cancelled context
	_, err = svc.ProcessRequest(ctx, "should fail")
	if err == nil {
		// This might not fail depending on implementation,
		// but we test that it doesn't panic
	}
}