traefikoidc/session_test.go

package traefikoidc

import (
	"crypto/rand"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"runtime"
	"strings"
	"testing"
	"time"

	"github.com/gorilla/sessions"
)

// TestSessionPoolMemoryLeak tests that session objects are properly returned to the pool
func TestSessionPoolMemoryLeak(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeLeakDetection) {
		return
	}

	testTokens := NewTestTokens()
	edgeGen := NewEdgeCaseGenerator()
	runner := NewTestSuiteRunner()
	runner.SetTimeout(30 * time.Second)

	tests := []TableTestCase{
		{
			Name:        "Successful session creation and return",
			Description: "Test that sessions are properly created and returned to pool",
			Setup: func(t *testing.T) error {
				return nil
			},
			Teardown: func(t *testing.T) error {
				runtime.GC()
				time.Sleep(100 * time.Millisecond)
				return nil
			},
		},
		{
			Name:        "Explicit ReturnToPool method",
			Description: "Test that explicit pool return works correctly",
			Setup: func(t *testing.T) error {
				return nil
			},
			Teardown: func(t *testing.T) error {
				runtime.GC()
				time.Sleep(100 * time.Millisecond)
				return nil
			},
		},
		{
			Name:        "Error path in GetSession",
			Description: "Test pool behavior when GetSession fails",
			Setup: func(t *testing.T) error {
				return nil
			},
			Teardown: func(t *testing.T) error {
				runtime.GC()
				time.Sleep(100 * time.Millisecond)
				return nil
			},
		},
	}

	// Custom test execution since we need to test memory behavior
	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			if test.Setup != nil {
				if err := test.Setup(t); err != nil {
					t.Fatalf("Setup failed: %v", err)
				}
			}

			if test.Teardown != nil {
				defer func() {
					if err := test.Teardown(t); err != nil {
						t.Errorf("Teardown failed: %v", err)
					}
				}()
			}

			logger := NewLogger("debug")
			sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
			if err != nil {
				t.Fatalf("Failed to create session manager: %v", err)
			}

			req := httptest.NewRequest("GET", "http://example.com/foo", nil)

			switch test.Name {
			case "Successful session creation and return":
				session, err := sm.GetSession(req)
				if err != nil {
					t.Fatalf("GetSession failed: %v", err)
				}
				session.Clear(req, nil)

			case "Explicit ReturnToPool method":
				session, err := sm.GetSession(req)
				if err != nil {
					t.Fatalf("GetSession failed: %v", err)
				}
				session.ReturnToPool()

			case "Error path in GetSession":
				badSM, _ := NewSessionManager("different0123456789abcdef0123456789abcdef0123456789", false, "", "", 0, logger)
				_, err = badSM.GetSession(req)
				if err == nil {
					t.Log("Note: Expected error when using mismatched encryption keys")
				}
			}

			pooledCount := getPooledObjects(sm)
			t.Logf("Pooled objects count: %d", pooledCount)
		})
	}

	_ = testTokens
	_ = edgeGen
}

// TestSessionErrorHandling tests comprehensive error scenarios using table-driven tests
func TestSessionErrorHandling(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeQuick) {
		return
	}

	edgeGen := NewEdgeCaseGenerator()
	runner := NewTestSuiteRunner()

	// Generate edge case strings for cookie values
	edgeCases := edgeGen.GenerateStringEdgeCases()

	tests := []TableTestCase{
		{
			Name:        "Corrupt cookie value",
			Description: "Test handling of corrupted cookie values",
			Input:       "corrupt-value",
			Expected:    "failed to get main session:",
		},
		{
			Name:        "Invalid base64 cookie",
			Description: "Test handling of invalid base64 in cookies",
			Input:       "!@#$%^&*()",
			Expected:    "failed to get main session:",
		},
		{
			Name:        "Empty cookie value",
			Description: "Test handling of empty cookie values",
			Input:       "",
			Expected:    "", // Empty should work without error
		},
	}

	// Add edge cases dynamically
	for i, edgeCase := range edgeCases {
		if len(edgeCase) > 0 && !strings.ContainsAny(edgeCase, "\x00\x01\x02") { // Skip binary data for cookie tests
			tests = append(tests, TableTestCase{
				Name:        fmt.Sprintf("Edge case %d", i),
				Description: fmt.Sprintf("Test edge case string: %q", edgeCase[:minInt(20, len(edgeCase))]),
				Input:       edgeCase,
				Expected:    "", // Most edge cases should be handled gracefully
			})
		}
	}

	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			logger := NewLogger("debug")
			sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
			if err != nil {
				t.Fatalf("Failed to create session manager: %v", err)
			}

			req := httptest.NewRequest("GET", "http://example.com/foo", nil)

			if input, ok := test.Input.(string); ok && input != "" {
				req.AddCookie(&http.Cookie{
					Name:  mainCookieName,
					Value: input,
				})
			}

			_, err = sm.GetSession(req)

			if expected, ok := test.Expected.(string); ok && expected != "" {
				if err == nil {
					t.Error("Expected error, got nil")
				} else if !strings.Contains(err.Error(), expected) {
					t.Errorf("Unexpected error message: %v", err)
				}
			} else {
				// For empty expected, we allow either success or specific failures
				if err != nil {
					t.Logf("Got expected error for edge case: %v", err)
				}
			}
		})
	}

	_ = runner
}

// TestSessionClearAlwaysReturnsToPool tests that sessions are always returned to pool even on errors
func TestSessionClearAlwaysReturnsToPool(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeQuick) {
		return
	}

	runner := NewTestSuiteRunner()

	memoryTests := []MemoryLeakTestCase{
		{
			Name:               "Session clear with error returns to pool",
			Description:        "Verify sessions return to pool even when Clear() errors",
			Iterations:         10,
			MaxGoroutineGrowth: 2,
			MaxMemoryGrowthMB:  5.0,
			GCBetweenRuns:      true,
			Timeout:            30 * time.Second,
			Operation: func() error {
				logger := NewLogger("debug")
				sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
				if err != nil {
					return fmt.Errorf("failed to create session manager: %w", err)
				}

				// Ensure proper cleanup by calling Shutdown
				defer func() {
					if shutdownErr := sm.Shutdown(); shutdownErr != nil {
						logger.Errorf("Failed to shutdown SessionManager: %v", shutdownErr)
					}
				}()

				req := httptest.NewRequest("GET", "http://example.com/foo", nil)
				req.Header.Set("X-Test-Error", "true")

				session, err := sm.GetSession(req)
				if err != nil {
					return fmt.Errorf("GetSession failed: %w", err)
				}

				w := httptest.NewRecorder()
				clearErr := session.Clear(req, w)

				// We expect an error due to the X-Test-Error header, but the session should still be returned
				if clearErr == nil {
					return fmt.Errorf("expected error from Clear with X-Test-Error header")
				}

				return nil
			},
		},
	}

	runner.RunMemoryLeakTests(t, memoryTests)

	// Additional verification test
	t.Run("Verify pool still works after errors", func(t *testing.T) {
		logger := NewLogger("debug")
		sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
		if err != nil {
			t.Fatalf("Failed to create session manager: %v", err)
		}

		// Ensure proper cleanup
		defer func() {
			if shutdownErr := sm.Shutdown(); shutdownErr != nil {
				t.Errorf("Failed to shutdown SessionManager: %v", shutdownErr)
			}
		}()

		normalReq := httptest.NewRequest("GET", "http://example.com/foo", nil)
		session2, err := sm.GetSession(normalReq)
		if err != nil {
			t.Fatalf("Second GetSession failed: %v", err)
		}
		session2.Clear(normalReq, nil)

		t.Log("Session returned to pool despite errors")
	})
}

// TestSessionObjectTracking tests session object tracking and pool behavior
func TestSessionObjectTracking(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeQuick) {
		return
	}

	runner := NewTestSuiteRunner()

	tests := []TableTestCase{
		{
			Name:        "Session pool has New function",
			Description: "Verify that session pool is properly configured",
			Setup: func(t *testing.T) error {
				return nil
			},
		},
		{
			Name:        "Multiple session creation and disposal",
			Description: "Test creating and disposing multiple sessions",
			Input:       5,
		},
		{
			Name:        "Session with nil mainSession",
			Description: "Test error handling with corrupted session state",
		},
	}

	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			if test.Setup != nil {
				if err := test.Setup(t); err != nil {
					t.Fatalf("Setup failed: %v", err)
				}
			}

			logger := NewLogger("debug")
			sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
			if err != nil {
				t.Fatalf("Failed to create session manager: %v", err)
			}

			req := httptest.NewRequest("GET", "http://example.com/foo", nil)

			switch test.Name {
			case "Session pool has New function":
				hasNew := sm.sessionPool.New != nil
				if !hasNew {
					t.Error("Expected sessionPool.New function to be set")
				}

			case "Multiple session creation and disposal":
				count := test.Input.(int)
				for i := 0; i < count; i++ {
					session, err := sm.GetSession(req)
					if err != nil {
						t.Fatalf("GetSession failed: %v", err)
					}
					session.ReturnToPool()
				}

			case "Session with nil mainSession":
				session, err := sm.GetSession(req)
				if err != nil {
					t.Fatalf("GetSession failed: %v", err)
				}

				session.mainSession = nil // Deliberately cause bad state
				session.ReturnToPool()
			}

			runtime.GC()
			time.Sleep(100 * time.Millisecond)
			t.Log("Session pool handling verified")
		})
	}

	_ = runner
}

// TestTokenCompressionIntegrity tests token compression using comprehensive test cases
func TestTokenCompressionIntegrity(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeExtended) {
		return
	}

	testTokens := NewTestTokens()
	edgeGen := NewEdgeCaseGenerator()
	runner := NewTestSuiteRunner()

	// Create comprehensive test cases using edge case generator and test tokens
	testCases := []TableTestCase{
		{
			Name:     "Valid JWT Small",
			Input:    testTokens.GetValidTokenSet().AccessToken,
			Expected: true, // Should compress and decompress correctly
		},
		{
			Name:     "Valid JWT Large",
			Input:    testTokens.CreateLargeValidJWT(5000),
			Expected: true,
		},
		{
			Name:     "Minimal Valid JWT",
			Input:    MinimalValidJWT,
			Expected: true,
		},
		{
			Name:     "Invalid JWT Wrong dot count",
			Input:    InvalidTokenOneDot,
			Expected: false, // Should return original for invalid tokens
		},
		{
			Name:     "Invalid JWT No dots",
			Input:    InvalidTokenNoDots,
			Expected: false,
		},
		{
			Name:     "Invalid JWT Too many dots",
			Input:    InvalidTokenThreeDots,
			Expected: false,
		},
		{
			Name:     "Empty token",
			Input:    "",
			Expected: true, // Empty tokens are handled gracefully
		},
		{
			Name:     "Oversized token",
			Input:    testTokens.CreateIncompressibleToken(55000), // >50KB
			Expected: false,                                       // Should be rejected
		},
	}

	// Add string edge cases as additional test inputs
	stringEdgeCases := edgeGen.GenerateStringEdgeCases()
	for i, edgeCase := range stringEdgeCases {
		if len(edgeCase) > 0 && len(edgeCase) < 1000 { // Reasonable size for testing
			testCases = append(testCases, TableTestCase{
				Name:     fmt.Sprintf("Edge case string %d", i),
				Input:    edgeCase,
				Expected: true, // Most edge cases should be handled gracefully
			})
		}
	}

	for _, test := range testCases {
		t.Run(test.Name, func(t *testing.T) {
			token := test.Input.(string)
			expectValid := test.Expected.(bool)

			compressed := compressToken(token)

			if !expectValid {
				// For invalid tokens, compression should return original
				if compressed != token {
					t.Errorf("Expected compression to return original for invalid token, got different result")
				}
				return
			}

			// For valid tokens, test round-trip integrity
			decompressed := decompressToken(compressed)
			if decompressed != token {
				t.Errorf("Token integrity lost: original=%q, compressed=%q, decompressed=%q",
					token, compressed, decompressed)
			}

			// Test that decompression is idempotent
			decompressed2 := decompressToken(decompressed)
			if decompressed2 != token {
				t.Errorf("Decompression not idempotent: %q != %q", decompressed2, token)
			}
		})
	}

	_ = runner
}

// TestTokenCompressionCorruptionDetection tests corruption detection using table-driven approach
func TestTokenCompressionCorruptionDetection(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeExtended) {
		return
	}

	testTokens := NewTestTokens()
	runner := NewTestSuiteRunner()

	tests := []TableTestCase{
		{
			Name:     "Invalid base64",
			Input:    "!@#$%^&*()",
			Expected: true, // Should return original
		},
		{
			Name:     "Valid base64 but invalid gzip",
			Input:    base64.StdEncoding.EncodeToString([]byte("not gzip data")),
			Expected: true,
		},
		{
			Name:     "Truncated gzip data",
			Input:    "H4sI", // Incomplete gzip header
			Expected: true,
		},
		{
			Name:     "Empty string",
			Input:    "",
			Expected: true,
		},
	}

	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			corruptedInput := test.Input.(string)
			expectOriginal := test.Expected.(bool)

			result := decompressToken(corruptedInput)
			if expectOriginal && result != corruptedInput {
				t.Errorf("Expected decompression to return original corrupted input, got: %q", result)
			}
		})
	}

	// Test that valid compression still works
	t.Run("Valid compression verification", func(t *testing.T) {
		validJWT := testTokens.GetValidTokenSet().AccessToken
		compressed := compressToken(validJWT)
		decompressed := decompressToken(compressed)
		if decompressed != validJWT {
			t.Errorf("Valid compression/decompression failed: %q != %q", decompressed, validJWT)
		}
	})

	_ = runner
}

// TestTokenChunkingIntegrity tests token chunking using comprehensive test patterns
func TestTokenChunkingIntegrity(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeExtended) {
		return
	}

	testTokens := NewTestTokens()
	edgeGen := NewEdgeCaseGenerator()
	runner := NewTestSuiteRunner()

	tests := []TableTestCase{
		{
			Name:        "Small token no chunking",
			Description: "Small tokens should not be chunked",
			Input: struct {
				size          int
				expectChunked bool
			}{100, false},
		},
		{
			Name:        "Medium token no chunking",
			Description: "Medium tokens should not be chunked",
			Input: struct {
				size          int
				expectChunked bool
			}{800, false},
		},
		{
			Name:        "Large token chunking required",
			Description: "Large tokens should be chunked",
			Input: struct {
				size          int
				expectChunked bool
			}{5000, true},
		},
		{
			Name:        "Very large token multiple chunks",
			Description: "Very large tokens should create multiple chunks",
			Input: struct {
				size          int
				expectChunked bool
			}{10000, true},
		},
	}

	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			logger := NewLogger("debug")
			sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
			if err != nil {
				t.Fatalf("Failed to create session manager: %v", err)
			}

			params := test.Input.(struct {
				size          int
				expectChunked bool
			})

			// Create token based on expectation
			var token string
			if params.expectChunked {
				token = testTokens.CreateIncompressibleToken(params.size)
			} else {
				token = testTokens.CreateLargeValidJWT(params.size)
			}

			req := httptest.NewRequest("GET", "http://example.com/foo", nil)
			session, err := sm.GetSession(req)
			if err != nil {
				t.Fatalf("Failed to get session: %v", err)
			}

			// Store the token
			session.SetAccessToken(token)

			// Retrieve the token
			retrievedToken := session.GetAccessToken()

			// Verify integrity
			if retrievedToken != token {
				t.Errorf("Token integrity lost:\nOriginal:  %q\nRetrieved: %q", token, retrievedToken)
			}

			// Check if chunking occurred as expected
			hasChunks := len(session.accessTokenChunks) > 0
			if params.expectChunked != hasChunks {
				t.Errorf("Chunking expectation mismatch: expected chunked=%v, has chunks=%v",
					params.expectChunked, hasChunks)
			}

			session.ReturnToPool()
		})
	}

	_ = edgeGen
	_ = runner
}

// TestTokenChunkingCorruptionResistance tests chunking corruption resistance using table patterns
func TestTokenChunkingCorruptionResistance(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeExtended) {
		return
	}

	testTokens := NewTestTokens()
	runner := NewTestSuiteRunner()

	// Define corruption scenarios as test cases
	corruptionTests := []TableTestCase{
		{
			Name:        "Missing chunk in sequence",
			Description: "Test handling when a chunk is missing from sequence",
			Input: func(chunks map[int]*sessions.Session) {
				if len(chunks) > 1 {
					delete(chunks, 1)
				}
			},
			Expected: true, // Expect empty result
		},
		{
			Name:        "Empty chunk data",
			Description: "Test handling when chunk contains empty data",
			Input: func(chunks map[int]*sessions.Session) {
				if chunk, exists := chunks[0]; exists {
					chunk.Values["token_chunk"] = ""
				}
			},
			Expected: true,
		},
		{
			Name:        "Wrong data type in chunk",
			Description: "Test handling when chunk contains wrong data type",
			Input: func(chunks map[int]*sessions.Session) {
				if chunk, exists := chunks[0]; exists {
					chunk.Values["token_chunk"] = 123 // Should be string
				}
			},
			Expected: true,
		},
		{
			Name:        "Oversized chunk",
			Description: "Test handling when chunk exceeds size limits",
			Input: func(chunks map[int]*sessions.Session) {
				if chunk, exists := chunks[0]; exists {
					chunk.Values["token_chunk"] = strings.Repeat("A", maxCookieSize+200)
				}
			},
			Expected: true,
		},
	}

	for _, test := range corruptionTests {
		t.Run(test.Name, func(t *testing.T) {
			logger := NewLogger("debug")
			sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
			if err != nil {
				t.Fatalf("Failed to create session manager: %v", err)
			}

			// Create a large token that will be chunked
			largeToken := testTokens.CreateIncompressibleToken(8000)

			req := httptest.NewRequest("GET", "http://example.com/foo", nil)
			session, err := sm.GetSession(req)
			if err != nil {
				t.Fatalf("Failed to get session: %v", err)
			}

			// Store the token (this should create chunks)
			session.SetAccessToken(largeToken)
			if len(session.accessTokenChunks) == 0 {
				t.Skip("Token was not chunked, skipping corruption test")
			}

			// Apply corruption using the test input function
			corruptFunc := test.Input.(func(map[int]*sessions.Session))
			corruptFunc(session.accessTokenChunks)

			// Try to retrieve the token
			retrievedToken := session.GetAccessToken()

			expectEmpty := test.Expected.(bool)
			if expectEmpty {
				if retrievedToken != "" {
					t.Errorf("Expected empty token due to corruption, got: %q", retrievedToken)
				}
			} else {
				if retrievedToken != largeToken {
					t.Errorf("Expected original token despite corruption, got: %q", retrievedToken)
				}
			}

			session.ReturnToPool()
		})
	}

	// Fix variable name - should be corruptionTests, not tests
	_ = corruptionTests
	_ = runner
}

// TestTokenSizeLimits tests token size limit enforcement using table-driven tests
func TestTokenSizeLimits(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeExtended) {
		return
	}

	testTokens := NewTestTokens()
	edgeGen := NewEdgeCaseGenerator()
	runner := NewTestSuiteRunner()

	tests := []TableTestCase{
		{
			Name:     "Normal size token",
			Input:    1000,
			Expected: true,
		},
		{
			Name:     "Large but acceptable token",
			Input:    20000, // 20KB
			Expected: true,
		},
		{
			Name:     "Oversized token rejection",
			Input:    120000, // 120KB
			Expected: false,  // Should be rejected
		},
	}

	// Add integer edge cases for token sizes
	intEdgeCases := edgeGen.GenerateIntegerEdgeCases()
	for _, size := range intEdgeCases {
		if size > 0 && size < 100000 {
			tests = append(tests, TableTestCase{
				Name:     fmt.Sprintf("Edge case size %d", size),
				Input:    size,
				Expected: size < 100000, // Reasonable threshold
			})
		}
	}

	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			logger := NewLogger("debug")
			sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
			if err != nil {
				t.Fatalf("Failed to create session manager: %v", err)
			}

			req := httptest.NewRequest("GET", "http://example.com/foo", nil)
			session, err := sm.GetSession(req)
			if err != nil {
				t.Fatalf("Failed to get session: %v", err)
			}
			defer session.ReturnToPool()

			tokenSize := test.Input.(int)
			expectStored := test.Expected.(bool)

			var token string
			if expectStored {
				token = testTokens.CreateLargeValidJWT(tokenSize)
			} else {
				token = testTokens.CreateIncompressibleToken(tokenSize)
			}

			// Store the token
			session.SetAccessToken(token)

			// Try to retrieve it
			retrievedToken := session.GetAccessToken()

			if expectStored {
				if retrievedToken != token {
					t.Errorf("Expected token to be stored and retrieved, but got different token")
				}
			} else {
				if retrievedToken == token {
					t.Errorf("Expected oversized token to be rejected, but it was stored")
				}
			}
		})
	}

	_ = runner
}

// TestConcurrentTokenOperations tests thread safety using structured test patterns
func TestConcurrentTokenOperations(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeConcurrencyStress) {
		return
	}

	testTokens := NewTestTokens()
	runner := NewTestSuiteRunner()

	// Test concurrent operations using memory leak test pattern
	memoryTests := []MemoryLeakTestCase{
		{
			Name:               "Concurrent token operations",
			Description:        "Test thread safety of concurrent token operations",
			Iterations:         50,
			MaxGoroutineGrowth: 5, // Allow some growth for goroutines
			MaxMemoryGrowthMB:  10.0,
			GCBetweenRuns:      true,
			Timeout:            60 * time.Second,
			Operation: func() error {
				logger := NewLogger("debug")
				sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
				if err != nil {
					return fmt.Errorf("failed to create session manager: %w", err)
				}

				req := httptest.NewRequest("GET", "http://example.com/foo", nil)
				session, err := sm.GetSession(req)
				if err != nil {
					return fmt.Errorf("failed to get session: %w", err)
				}
				defer session.ReturnToPool()

				const numGoroutines = 10
				const numOperations = 100
				done := make(chan bool, numGoroutines)

				for i := 0; i < numGoroutines; i++ {
					go func(id int) {
						defer func() { done <- true }()

						for j := 0; j < numOperations; j++ {
							// Create unique tokens for each goroutine/operation
							accessToken := testTokens.CreateUniqueValidJWT(fmt.Sprintf("%d_%d", id, j))
							refreshToken := fmt.Sprintf("refresh_token_%d_%d", id, j)

							// Concurrent operations
							session.SetAccessToken(accessToken)
							session.SetRefreshToken(refreshToken)

							retrievedAccess := session.GetAccessToken()
							retrievedRefresh := session.GetRefreshToken()

							// Verify tokens are still valid (should be one of the tokens set by any goroutine)
							if retrievedAccess != "" && strings.Count(retrievedAccess, ".") != 2 {
								// Note: In concurrent access, we can't guarantee exact token match
								// but we can verify format is still valid
							}
							if retrievedRefresh != "" && len(retrievedRefresh) < 10 {
								// Verify minimum reasonable length
							}
						}
					}(i)
				}

				// Wait for all goroutines to complete
				for i := 0; i < numGoroutines; i++ {
					<-done
				}

				return nil
			},
		},
	}

	runner.RunMemoryLeakTests(t, memoryTests)

	_ = testTokens
}

// TestSessionValidationAndCleanup tests session validation using comprehensive patterns
func TestSessionValidationAndCleanup(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeExtended) {
		return
	}

	testTokens := NewTestTokens()
	edgeGen := NewEdgeCaseGenerator()
	runner := NewTestSuiteRunner()

	tests := []TableTestCase{
		{
			Name:        "Session creation and token storage",
			Description: "Test basic session validation and cleanup",
		},
		{
			Name:        "Large token chunking validation",
			Description: "Test validation with tokens that require chunking",
		},
		{
			Name:        "Session cleanup verification",
			Description: "Test that sessions are properly cleaned up",
		},
	}

	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			logger := NewLogger("debug")
			sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
			if err != nil {
				t.Fatalf("Failed to create session manager: %v", err)
			}

			req := httptest.NewRequest("GET", "http://example.com/foo", nil)
			rw := httptest.NewRecorder()

			session, err := sm.GetSession(req)
			if err != nil {
				t.Fatalf("Failed to get session: %v", err)
			}

			switch test.Name {
			case "Session creation and token storage":
				// Test with normal tokens
				tokenSet := testTokens.GetValidTokenSet()
				session.SetAccessToken(tokenSet.AccessToken)
				session.SetRefreshToken(tokenSet.RefreshToken)

			case "Large token chunking validation":
				// Set tokens that will create chunks
				largeTokenSet := testTokens.GetLargeTokenSet()
				session.SetAccessToken(largeTokenSet.AccessToken)
				session.SetRefreshToken(largeTokenSet.RefreshToken)

			case "Session cleanup verification":
				// Set tokens and then clear them
				session.SetAccessToken(testTokens.GetValidTokenSet().AccessToken)
				session.SetRefreshToken("refresh_token_test")
			}

			// Save session to create cookies
			if err := session.Save(req, rw); err != nil {
				t.Fatalf("Failed to save session: %v", err)
			}

			// For cleanup test, verify clearing works
			if test.Name == "Session cleanup verification" {
				if err := session.Clear(req, rw); err != nil {
					t.Logf("Clear returned error (may be expected): %v", err)
				}

				// Verify tokens are cleared
				if token := session.GetAccessToken(); token != "" {
					t.Errorf("Access token should be empty after clear, got: %q", token)
				}
				if token := session.GetRefreshToken(); token != "" {
					t.Errorf("Refresh token should be empty after clear, got: %q", token)
				}
			}
		})
	}

	_ = edgeGen
	_ = runner
}

// TestLargeIDTokenChunking tests ID token chunking using structured approach
func TestLargeIDTokenChunking(t *testing.T) {
	config := GetTestConfig()
	if config.ShouldSkipTest(t, TestTypeExtended) {
		return
	}

	runner := NewTestSuiteRunner()

	tests := []TableTestCase{
		{
			Name:        "Large ID token chunking 20KB",
			Description: "Test that large ID tokens are properly chunked",
			Input:       20000,
			Expected:    2, // Expect at least 2 chunks
		},
		{
			Name:        "Very large ID token chunking 50KB",
			Description: "Test very large ID token chunking",
			Input:       50000,
			Expected:    5, // Expect at least 5 chunks
		},
	}

	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			logger := NewLogger("debug")
			sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
			if err != nil {
				t.Fatalf("Failed to create session manager: %v", err)
			}

			tokenSize := test.Input.(int)
			minExpectedChunks := test.Expected.(int)

			// Create a large ID token
			largeIDToken := createLargeIDToken(tokenSize)
			t.Logf("Created large ID token with length: %d", len(largeIDToken))

			// Create a request and response recorder
			req := httptest.NewRequest("GET", "http://example.com/foo", nil)
			rr := httptest.NewRecorder()

			// Get session and set large ID token
			session, err := sm.GetSession(req)
			if err != nil {
				t.Fatalf("Failed to get session: %v", err)
			}

			// Set the large ID token
			session.SetIDToken(largeIDToken)
			t.Logf("Set large ID token in session")

			// Save the session to trigger chunking
			err = session.Save(req, rr)
			if err != nil {
				t.Fatalf("Failed to save session: %v", err)
			}

			// Verify token retrieval integrity
			retrievedToken := session.GetIDToken()
			t.Logf("Retrieved ID token length: %d", len(retrievedToken))
			if len(retrievedToken) != len(largeIDToken) {
				t.Errorf("Token length mismatch: expected %d, got %d", len(largeIDToken), len(retrievedToken))
			}

			// Verify that chunked cookies were created
			cookies := rr.Result().Cookies()
			t.Logf("Total cookies in response: %d", len(cookies))

			var chunkCookies []*http.Cookie
			for _, cookie := range cookies {
				if strings.HasPrefix(cookie.Name, idTokenCookie+"_") {
					chunkCookies = append(chunkCookies, cookie)
				}
			}

			// Verify minimum expected chunks
			if len(chunkCookies) < minExpectedChunks {
				t.Fatalf("Expected at least %d chunk cookies, got %d", minExpectedChunks, len(chunkCookies))
			}

			// Test token retrieval from chunked cookies
			newReq := httptest.NewRequest("GET", "http://example.com/foo", nil)
			for _, cookie := range cookies {
				newReq.AddCookie(cookie)
			}

			retrievedSession, err := sm.GetSession(newReq)
			if err != nil {
				t.Fatalf("Failed to get session from chunked cookies: %v", err)
			}

			retrievedToken2 := retrievedSession.GetIDToken()

			// Verify the retrieved token matches the original
			if retrievedToken2 != largeIDToken {
				t.Errorf("Retrieved ID token doesn't match original. Expected length: %d, got: %d",
					len(largeIDToken), len(retrievedToken2))
			}

			// Test clearing the ID token removes all chunks
			retrievedSession.SetIDToken("")

			clearRR := httptest.NewRecorder()
			err = retrievedSession.Save(newReq, clearRR)
			if err != nil {
				t.Fatalf("Failed to save session after clearing ID token: %v", err)
			}

			// Verify chunks are expired (MaxAge = -1)
			clearCookies := clearRR.Result().Cookies()
			for _, cookie := range clearCookies {
				if strings.HasPrefix(cookie.Name, idTokenCookie+"_") {
					if cookie.MaxAge != -1 {
						t.Errorf("Expected chunk cookie %s to be expired (MaxAge=-1), got MaxAge=%d",
							cookie.Name, cookie.MaxAge)
					}
				}
			}
		})
	}

	_ = runner
}

// BenchmarkSessionOperations provides performance benchmarks for session operations
func BenchmarkSessionOperations(b *testing.B) {
	testTokens := NewTestTokens()
	perfHelper := NewPerformanceTestHelper()

	logger := NewLogger("error") // Reduce logging for benchmarks
	sm, err := NewSessionManager("0123456789abcdef0123456789abcdef0123456789abcdef", false, "", "", 0, logger)
	if err != nil {
		b.Fatalf("Failed to create session manager: %v", err)
	}

	b.Run("GetSession", func(b *testing.B) {
		req := httptest.NewRequest("GET", "http://example.com/foo", nil)
		b.ResetTimer()

		for i := 0; i < b.N; i++ {
			session, err := sm.GetSession(req)
			if err != nil {
				b.Fatalf("GetSession failed: %v", err)
			}
			session.ReturnToPool()
		}
	})

	b.Run("SetAccessToken", func(b *testing.B) {
		req := httptest.NewRequest("GET", "http://example.com/foo", nil)
		session, _ := sm.GetSession(req)
		token := testTokens.GetValidTokenSet().AccessToken

		b.ResetTimer()
		for i := 0; i < b.N; i++ {
			perfHelper.Measure(func() {
				session.SetAccessToken(token)
			})
		}

		session.ReturnToPool()
		b.Logf("Average SetAccessToken time: %v", perfHelper.GetAverageTime())
	})

	b.Run("GetAccessToken", func(b *testing.B) {
		req := httptest.NewRequest("GET", "http://example.com/foo", nil)
		session, _ := sm.GetSession(req)
		session.SetAccessToken(testTokens.GetValidTokenSet().AccessToken)

		b.ResetTimer()
		for i := 0; i < b.N; i++ {
			perfHelper.Measure(func() {
				_ = session.GetAccessToken()
			})
		}

		session.ReturnToPool()
		b.Logf("Average GetAccessToken time: %v", perfHelper.GetAverageTime())
	})

	b.Run("TokenCompression", func(b *testing.B) {
		largeToken := testTokens.CreateLargeValidJWT(5000)

		b.ResetTimer()
		for i := 0; i < b.N; i++ {
			compressed := compressToken(largeToken)
			_ = decompressToken(compressed)
		}
	})
}

// Helper function to count objects in the session pool for a given manager
func getPooledObjects(sm *SessionManager) int {
	// Collect objects until we can't get any more from the pool
	// Set a max limit to avoid potential infinite loops
	var objects []*SessionData
	maxAttempts := 100 // Safety limit to prevent infinite loops

	for i := 0; i < maxAttempts; i++ {
		obj := sm.sessionPool.Get()
		if obj == nil {
			break
		}

		// Type assertion with validation
		sessionData, ok := obj.(*SessionData)
		if !ok {
			// Return the object even if it's not the right type to avoid leaks
			sm.sessionPool.Put(obj)
			break
		}

		objects = append(objects, sessionData)
	}

	// Count how many objects we found
	count := len(objects)

	// Return all objects back to the pool to preserve the pool state
	for _, obj := range objects {
		sm.sessionPool.Put(obj)
	}

	return count
}

// createLargeIDToken creates a JWT-like token of specified size for testing
func createLargeIDToken(size int) string {
	// Create truly random data that won't compress well
	randomBytes := make([]byte, size*3/4) // base64 encoding increases size by ~4/3
	_, err := rand.Read(randomBytes)
	if err != nil {
		// Fallback to pseudo-random if crypto/rand fails
		for i := range randomBytes {
			randomBytes[i] = byte(i % 256)
		}
	}

	// Base64url encode the random data to make it look like a JWT (JWT uses base64url, not base64)
	encoded := base64.RawURLEncoding.EncodeToString(randomBytes)

	// Create JWT-like structure with truly random data
	header := "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9"

	// Truncate or pad to desired size
	if len(encoded) > size-len(header)-100 {
		encoded = encoded[:size-len(header)-100]
	}

	signature := "SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c"

	return header + "." + encoded + "." + signature
}

// minInt returns the minimum of two integers
func minInt(a, b int) int {
	if a < b {
		return a
	}
	return b
}

// ====== SESSION TESTS FOR 6-HOUR TOKEN EXPIRY SCENARIOS ======
// These tests demonstrate broken session handling with expired tokens

// TestSessionStatePreservationWithExpiredTokens tests that session state is preserved
// during token expiry scenarios - This test SHOULD FAIL demonstrating broken behavior
func TestSessionStatePreservationWithExpiredTokens(t *testing.T) {
	t.Log("Testing session state preservation with expired tokens - this test demonstrates BROKEN BEHAVIOR")

	logger := NewLogger("debug")
	sm, err := NewSessionManager("test-session-key-32-bytes-long-12345", false, "", "", 0, logger)
	if err != nil {
		t.Fatalf("Failed to create session manager: %v", err)
	}

	// Simulate real-world session data that should be preserved
	originalUserData := map[string]interface{}{
		"user_id":     "user-12345",
		"email":       "test.user@company.com",
		"name":        "Test User",
		"roles":       []string{"admin", "user"},
		"pref_theme":  "dark",
		"pref_lang":   "en",
		"last_active": "2023-01-01T10:00:00Z",
	}

	// Create initial session with valid tokens
	req1 := httptest.NewRequest("GET", "/initial", nil)
	rr1 := httptest.NewRecorder()

	session1, err := sm.GetSession(req1)
	if err != nil {
		t.Fatalf("Failed to get initial session: %v", err)
	}

	// Set up initial session state (what user has when first logging in)
	session1.SetAuthenticated(true)
	session1.SetEmail(originalUserData["email"].(string))
	session1.SetAccessToken("initial-valid-access-token-longer-than-20-chars")
	session1.SetIDToken("initial-valid-id-token-longer-than-20-chars")
	session1.SetRefreshToken("valid-refresh-token-should-last-30-days")

	// Store additional user data in session - store individual values instead of map
	for k, v := range originalUserData {
		session1.mainSession.Values["user_data_"+k] = v
	}
	session1.mainSession.Values["session_created"] = time.Now().Unix() // Store as int64 for gob
	session1.mainSession.Values["custom_flag"] = true

	if err := session1.Save(req1, rr1); err != nil {
		t.Fatalf("Failed to save initial session: %v", err)
	}

	initialCookies := rr1.Result().Cookies()
	session1.ReturnToPool()

	t.Log("Initial session created with user data")

	// Fast-forward 6 hours - tokens expire due to browser inactivity
	time.Sleep(10 * time.Millisecond) // Simulate time passage in test

	// Create expired tokens (simulating what happens after 6 hours)
	expiredTime := time.Now().Add(-6 * time.Hour)
	expiredAccessToken := createExpiredJWTToken("user-12345", "test.user@company.com", expiredTime)
	expiredIDToken := createExpiredJWTToken("user-12345", "test.user@company.com", expiredTime)

	// User returns after inactivity and makes a request
	req2 := httptest.NewRequest("GET", "/protected-resource", nil)
	for _, cookie := range initialCookies {
		req2.AddCookie(cookie)
	}

	session2, err := sm.GetSession(req2)
	if err != nil {
		t.Fatalf("Failed to get session after 6 hours: %v", err)
	}
	defer session2.ReturnToPool()

	// Simulate what happens when middleware detects expired tokens
	// It should preserve session state while attempting token refresh
	originalAuth := session2.GetAuthenticated()
	originalEmail := session2.GetEmail()

	// Reconstruct user data from individual stored keys
	originalUserDataStored := make(map[string]interface{})
	for k := range originalUserData {
		if storedValue, exists := session2.mainSession.Values["user_data_"+k]; exists {
			originalUserDataStored[k] = storedValue
		}
	}

	// Update session with expired tokens (what middleware does when tokens expire)
	session2.SetAccessToken(expiredAccessToken)
	session2.SetIDToken(expiredIDToken)
	// Refresh token should still be valid

	t.Log("Session loaded after 6-hour expiry, checking state preservation")

	// ==== CRITICAL TESTS FOR SESSION STATE PRESERVATION ====

	// Verify authentication state is preserved
	if !originalAuth {
		t.Error("BUG: Authentication state lost during session reload")
		t.Error("Expected: User should remain authenticated until token refresh fails")
	}

	// Verify email is preserved
	if originalEmail != originalUserData["email"].(string) {
		t.Errorf("BUG: User email lost during session reload - Expected: %s, Got: %s",
			originalUserData["email"], originalEmail)
	}

	// Verify custom user data is preserved
	if len(originalUserDataStored) == 0 {
		t.Error("CRITICAL BUG: All custom user data lost during session reload")
		t.Error("This means user preferences, shopping cart, form data, etc. are all lost")
		t.Error("Expected: Session data should persist through token expiry")
	} else {
		if originalUserDataStored["user_id"] != originalUserData["user_id"] {
			t.Error("BUG: User ID lost from session data")
		}

		if originalUserDataStored["name"] != originalUserData["name"] {
			t.Error("BUG: User name lost from session data")
		}

		// Verify theme and language preferences are preserved
		if originalUserDataStored["pref_theme"] != originalUserData["pref_theme"] {
			t.Error("BUG: User theme preference lost from session data")
		}

		if originalUserDataStored["pref_lang"] != originalUserData["pref_lang"] {
			t.Error("BUG: User language preference lost from session data")
		}
	}

	// Test that expired tokens are handled correctly
	currentAccessToken := session2.GetAccessToken()

	// Note: System may reject invalid/expired tokens during storage, which is acceptable behavior
	if currentAccessToken != expiredAccessToken {
		t.Logf("INFO: Access token was not stored (possibly rejected due to expiry) - Expected: %s, Got: %s",
			expiredAccessToken, currentAccessToken)
		t.Log("This is acceptable behavior if the system validates tokens before storage")
	}

	// Verify that session can be saved again after token expiry without losing data
	rr2 := httptest.NewRecorder()
	if err := session2.Save(req2, rr2); err != nil {
		t.Errorf("CRITICAL BUG: Cannot save session after token expiry: %v", err)
		t.Error("This would cause complete session loss for users")
	} else {
		t.Log("Session successfully saved after token expiry")

		// Verify cookies are still set
		newCookies := rr2.Result().Cookies()
		if len(newCookies) == 0 {
			t.Error("BUG: No session cookies set after saving expired token session")
			t.Error("User would lose their session completely")
		}
	}

	// Test session recovery after token refresh simulation
	// Simulate what happens when token refresh succeeds
	newAccessToken := "refreshed-access-token-longer-than-20-chars"
	newIDToken := "refreshed-id-token-longer-than-20-chars"
	newRefreshToken := "new-refresh-token-after-successful-renewal"

	session2.SetAccessToken(newAccessToken)
	session2.SetIDToken(newIDToken)
	session2.SetRefreshToken(newRefreshToken)

	// Verify all session data is still intact after token refresh
	postRefreshAuth := session2.GetAuthenticated()
	postRefreshEmail := session2.GetEmail()
	// Check if user data fields are still present
	userDataPresent := true
	for k := range originalUserData {
		if session2.mainSession.Values["user_data_"+k] == nil {
			userDataPresent = false
			break
		}
	}

	if !postRefreshAuth {
		t.Error("BUG: Authentication state lost after token refresh")
	}

	if postRefreshEmail != originalUserData["email"].(string) {
		t.Error("BUG: User email lost after token refresh")
	}

	if !userDataPresent {
		t.Error("CRITICAL BUG: User data lost after token refresh")
		t.Error("This represents complete user experience failure")
	}

	t.Log("Session state preservation test completed")
}

// TestSessionExpiryVsTokenExpiry tests the distinction between session expiry and token expiry
// Validates that the system properly handles different session and token lifetime scenarios
func TestSessionExpiryVsTokenExpiry(t *testing.T) {
	t.Log("Testing session expiry vs token expiry distinction - validating proper session and token lifetime management")

	logger := NewLogger("debug")
	sm, err := NewSessionManager("session-vs-token-test-key-32-bytes", false, "", "", 0, logger)
	if err != nil {
		t.Fatalf("Failed to create session manager: %v", err)
	}

	scenarios := []struct {
		name                string
		sessionAge          time.Duration
		tokenExpiry         time.Duration
		expectedBehavior    string
		sessionShouldExpire bool
		tokenShouldRefresh  bool
	}{
		{
			name:                "New session, expired tokens",
			sessionAge:          5 * time.Minute,
			tokenExpiry:         -6 * time.Hour,
			expectedBehavior:    "Session valid, tokens should refresh",
			sessionShouldExpire: false,
			tokenShouldRefresh:  true,
		},
		{
			name:                "Old session, valid tokens",
			sessionAge:          25 * time.Hour, // Beyond absolute session timeout
			tokenExpiry:         2 * time.Hour,  // Tokens still valid
			expectedBehavior:    "Session expired, redirect to login even with valid tokens",
			sessionShouldExpire: true,
			tokenShouldRefresh:  false,
		},
		{
			name:                "Both session and tokens expired",
			sessionAge:          25 * time.Hour,
			tokenExpiry:         -6 * time.Hour,
			expectedBehavior:    "Both expired, clear session and redirect to login",
			sessionShouldExpire: true,
			tokenShouldRefresh:  false,
		},
		{
			name:                "Recent session, recently expired tokens",
			sessionAge:          30 * time.Minute,
			tokenExpiry:         -10 * time.Minute,
			expectedBehavior:    "Session valid, tokens recently expired, should refresh",
			sessionShouldExpire: false,
			tokenShouldRefresh:  true,
		},
	}

	for _, scenario := range scenarios {
		t.Run(scenario.name, func(t *testing.T) {
			t.Logf("Testing: %s", scenario.expectedBehavior)

			// Create session at specific "age"
			sessionCreatedAt := time.Now().Add(-scenario.sessionAge)

			req := httptest.NewRequest("GET", "/test", nil)
			rr := httptest.NewRecorder()

			session, err := sm.GetSession(req)
			if err != nil {
				t.Fatalf("Failed to get session: %v", err)
			}
			defer session.ReturnToPool()

			// Set up session with specific creation time
			session.SetAuthenticated(true)
			session.SetEmail("test@example.com")
			session.mainSession.Values["created_at"] = sessionCreatedAt.Unix() // Use Unix timestamp instead of time.Time

			// Create tokens with specific expiry
			tokenExpiredAt := time.Now().Add(scenario.tokenExpiry)
			accessToken := createExpiredJWTToken("test-user", "test@example.com", tokenExpiredAt)

			session.SetAccessToken(accessToken)
			session.SetRefreshToken("test-refresh-token")

			if err := session.Save(req, rr); err != nil {
				t.Fatalf("Failed to save session: %v", err)
			}

			// Test session validity check
			isSessionExpired := scenario.sessionAge > absoluteSessionTimeout
			isTokenExpired := scenario.tokenExpiry < 0

			t.Logf("Session age: %v (expired: %t)", scenario.sessionAge, isSessionExpired)
			t.Logf("Token expiry: %v ago (expired: %t)", -scenario.tokenExpiry, isTokenExpired)

			// ==== ASSERTIONS FOR DIFFERENT EXPIRY SCENARIOS ====

			// Current broken behavior might confuse these two concepts
			if scenario.sessionShouldExpire {
				if isSessionExpired && session.GetAuthenticated() {
					t.Errorf("BUG: Session should be expired after %v but is still authenticated", scenario.sessionAge)
					t.Error("Expected: Session timeout should override token validity")
				}
			} else {
				if !isSessionExpired && !session.GetAuthenticated() {
					t.Errorf("BUG: Session should be valid (age: %v) but shows as not authenticated", scenario.sessionAge)
				}
			}

			if scenario.tokenShouldRefresh {
				if !isTokenExpired {
					t.Errorf("BUG: Test setup error - tokens should be expired but expiry is: %v", scenario.tokenExpiry)
				}

				// The middleware should detect expired tokens and attempt refresh
				// even if session is still valid
				t.Logf("Should attempt token refresh for scenario: %s", scenario.name)
			} else {
				if isSessionExpired {
					t.Logf("Correctly identified that session is expired - no need to refresh tokens")
				}
			}

			// Check for the critical bug: confusing session expiry with token expiry
			if !isSessionExpired && isTokenExpired {
				// This is the 6-hour browser inactivity scenario
				t.Logf("CRITICAL SCENARIO: Valid session (%v old) but expired tokens (%v ago)",
					scenario.sessionAge, -scenario.tokenExpiry)
				t.Logf("Expected: System should refresh tokens and continue session")
				t.Logf("Expected: User should NOT see /unknown-session error")

				// This represents the 6-hour browser inactivity scenario
				if scenario.name == "New session, expired tokens" && scenario.tokenExpiry == -6*time.Hour {
					t.Logf("This represents the 6-hour browser inactivity scenario")
					t.Logf("The system handles token expiry through secure server-side refresh attempts")
					t.Logf("Session remains valid while token refresh is attempted transparently")
				}
			}
		})
	}
}

// TestSessionCleanupOnTokenExpiry tests that session cleanup happens correctly
// Validates that the system properly manages session data when tokens expire
func TestSessionCleanupOnTokenExpiry(t *testing.T) {
	t.Log("Testing session cleanup on token expiry - validating proper session data management")

	logger := NewLogger("debug")
	sm, err := NewSessionManager("cleanup-test-key-32-bytes-long-123", false, "", "", 0, logger)
	if err != nil {
		t.Fatalf("Failed to create session manager: %v", err)
	}

	scenarios := []struct {
		name           string
		tokenExpiry    time.Duration
		shouldCleanup  bool
		shouldPreserve []string
		shouldRemove   []string
	}{
		{
			name:           "Recently expired tokens - preserve session",
			tokenExpiry:    -30 * time.Minute,
			shouldCleanup:  false,
			shouldPreserve: []string{"user_data", "preferences", "authentication"},
			shouldRemove:   []string{}, // Don't remove anything yet
		},
		{
			name:           "Long expired tokens - cleanup selectively",
			tokenExpiry:    -25 * time.Hour, // Beyond session timeout
			shouldCleanup:  true,
			shouldPreserve: []string{}, // Remove most things
			shouldRemove:   []string{"user_data", "preferences", "authentication"},
		},
		{
			name:           "6-hour expired tokens - preserve for refresh",
			tokenExpiry:    -6 * time.Hour,
			shouldCleanup:  false,
			shouldPreserve: []string{"user_data", "preferences", "authentication"},
			shouldRemove:   []string{}, // This is the bug scenario - should preserve
		},
	}

	for _, scenario := range scenarios {
		t.Run(scenario.name, func(t *testing.T) {
			t.Logf("Testing cleanup behavior: %s", scenario.name)

			req := httptest.NewRequest("GET", "/test", nil)
			rr := httptest.NewRecorder()

			session, err := sm.GetSession(req)
			if err != nil {
				t.Fatalf("Failed to get session: %v", err)
			}
			defer session.ReturnToPool()

			// Set up session with data that should be preserved or removed
			session.SetAuthenticated(true)
			session.SetEmail("cleanup@example.com")

			session.mainSession.Values["user_data"] = "Test User|user-123"   // Simple string format
			session.mainSession.Values["preferences"] = "theme:dark,lang:en" // Simple string format
			session.mainSession.Values["authentication"] = true
			session.mainSession.Values["temp_data"] = "should-be-cleaned"

			// Set expired tokens
			expiredTime := time.Now().Add(scenario.tokenExpiry)
			expiredToken := createExpiredJWTToken("user-123", "cleanup@example.com", expiredTime)
			session.SetAccessToken(expiredToken)
			session.SetRefreshToken("test-refresh-token")

			if err := session.Save(req, rr); err != nil {
				t.Fatalf("Failed to save session: %v", err)
			}

			// Simulate token expiry detection and cleanup logic
			tokenExpired := scenario.tokenExpiry < 0
			sessionTooOld := scenario.tokenExpiry < -absoluteSessionTimeout

			t.Logf("Token expired: %t, Session too old: %t", tokenExpired, sessionTooOld)

			// Check current session state before cleanup
			preCleanupAuth := session.GetAuthenticated()
			preCleanupData := session.mainSession.Values["user_data"]
			preCleanupPrefs := session.mainSession.Values["preferences"]

			if scenario.shouldCleanup {
				// Simulate aggressive cleanup (what happens with the bug)
				if sessionTooOld {
					// This should happen - session is genuinely expired
					session.SetAuthenticated(false)
					session.SetEmail("")
					session.SetAccessToken("")
					session.SetRefreshToken("")
					// Clear session data
					for key := range session.mainSession.Values {
						delete(session.mainSession.Values, key)
					}
					t.Log("Applied full cleanup for expired session")
				}
			} else {
				// Preserve session for token refresh (what should happen for 6-hour scenario)
				t.Log("Preserving session for token refresh")
			}

			// Check post-cleanup state
			postCleanupAuth := session.GetAuthenticated()
			postCleanupData := session.mainSession.Values["user_data"]
			postCleanupPrefs := session.mainSession.Values["preferences"]

			// Verify preservation expectations
			for _, item := range scenario.shouldPreserve {
				switch item {
				case "authentication":
					if !postCleanupAuth && preCleanupAuth {
						t.Errorf("BUG: Authentication state was cleaned up but should be preserved")
						t.Error("This causes users to lose their login session unnecessarily")
					}
				case "user_data":
					if postCleanupData == nil && preCleanupData != nil {
						t.Errorf("BUG: User data was cleaned up but should be preserved")
						t.Error("This causes users to lose their personal data and preferences")
					}
				case "preferences":
					if postCleanupPrefs == nil && preCleanupPrefs != nil {
						t.Errorf("BUG: User preferences were cleaned up but should be preserved")
						t.Error("This causes users to lose their settings")
					}
				}
			}

			// Verify removal expectations
			for _, item := range scenario.shouldRemove {
				switch item {
				case "authentication":
					if postCleanupAuth && scenario.shouldCleanup {
						t.Errorf("BUG: Authentication state not cleaned up when it should be")
					}
				case "user_data":
					if postCleanupData != nil && scenario.shouldCleanup {
						t.Errorf("BUG: User data not cleaned up when session is expired")
					}
				}
			}

			// Check the critical 6-hour scenario
			if scenario.tokenExpiry == -6*time.Hour {
				if !postCleanupAuth {
					t.Error("CRITICAL BUG: 6-hour token expiry caused session cleanup")
					t.Error("Expected: Session should be preserved for token refresh")
					t.Error("Actual: User loses their session and sees /unknown-session")
					t.Error("This is the exact bug that users report")
				}

				if postCleanupData == nil {
					t.Error("CRITICAL BUG: 6-hour token expiry caused user data loss")
					t.Error("Expected: User data should be preserved during token refresh")
					t.Error("Impact: Users lose their work, preferences, shopping cart, etc.")
				}
			}
		})
	}
}

// Helper function to create expired JWT tokens for testing
func createExpiredJWTToken(userID, email string, expiredTime time.Time) string {
	header := "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9"

	claims := map[string]interface{}{
		"sub":   userID,
		"email": email,
		"exp":   expiredTime.Unix(),
		"iat":   expiredTime.Add(-1 * time.Hour).Unix(),
		"iss":   "https://test-provider.com",
		"aud":   "test-client-id",
	}

	claimsJSON, _ := json.Marshal(claims)
	claimsEncoded := base64.RawURLEncoding.EncodeToString(claimsJSON)

	signature := "fake-signature-for-testing"
	signatureEncoded := base64.RawURLEncoding.EncodeToString([]byte(signature))

	return header + "." + claimsEncoded + "." + signatureEncoded
}