• There are 155 files with units, with 11,222 lines of code.
• 0 very complex files (McCabe index sum 251+; 0 lines of code)
• 0 complex files (McCabe index sum 126-250; 0 lines of code)
• 2 medium complex files (McCabe index sum 51-125; 421 lines of code)
• 3 slightly complex files (McCabe index sum 26-50; 565 lines of code)
• 150 simple files (McCabe index sum 1-25; 10,236 lines of code)
• 101 main files have no units (e.g. languages without unit analysis, or files without functions) and are not classified.

The McCabe index of a file grows with its size: per 100 lines tells a large but plain file from a dense one, and most complex unit whether the complexity sits in one unit or is spread over many.

File	# lines	# units	McCabe index (sum)	per 100 lines	most complex unit
MatchStatusNotificationBuilder.scala in football/src/main/scala/com/gu/mobile/notifications/football/notificationbuilders	216	7	62	29	22
MatchEvents.scala in football/src/main/scala/com/gu/mobile/notifications/football/models	205	11	52	25	21
LiveActivityChannelRepository.scala in liveactivities/src/main/scala/com/gu/liveactivities/service	203	13	32	16	5
Main.scala in notification/app/notification/controllers	145	6	27	19	12
ApnsPayloadBuilder.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker/delivery/apns/models/payload	217	8	27	12	8
FcmPayloadBuilder.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker/delivery/fcm/models/payload	220	7	24	11	8
FootballData.scala in football/src/main/scala/com/gu/mobile/notifications/football/lib	144	6	22	15	6
Harvester.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker	170	7	22	13	7
ChannelManagerLambda.scala in liveactivities/src/main/scala/com/gu/liveactivities	98	5	22	22	7
Payloads.scala in api-models/src/main/scala/com/gu/mobile.notifications.client/models	288	6	21	7	5
FcmTransportJdkImpl.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker/delivery/fcm	114	7	21	18	9
FcmClient.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker/delivery/fcm	125	6	21	17	9
Notification.scala in common/src/main/scala/models	268	3	21	8	10
LiveActivityEventBridgePayloads.scala in api-models/src/main/scala/com/gu/mobile.notifications.client/models/liveActitivites	95	4	20	21	8
EventFilter.scala in football/src/main/scala/com/gu/mobile/notifications/football/lib	76	7	18	24	5
TopicType.scala in common/src/main/scala/models	48	2	18	38	15
MatchStatusLiveActivityPayloadBuilder.scala in football/src/main/scala/com/gu/mobile/notifications/football/notificationbuilders	83	1	17	20	17
SendingResults.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker/models	62	4	17	27	9
BroadcastLambda.scala in liveactivities/src/main/scala/com/gu/liveactivities	65	2	17	26	11
BroadcastPayloads.scala in liveactivities/src/main/scala/com/gu/liveactivities/models	120	5	16	13	5
DynamoJsonConversions.scala in common/src/main/scala/aws	51	7	16	31	9
Lambda.scala in football/src/main/scala/com/gu/mobile/notifications/football	142	6	15	11	5
LruCache.scala in common/src/main/scala/utils	68	3	15	22	9
JsonFormatsHelper.scala in api-models/src/main/scala/com/gu/mobile.notifications.client/lib	34	6	14	41	3
GuardianNotificationSender.scala in notification/app/notification/services/guardian	111	5	14	13	5
Configuration.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker	140	7	14	10	4
JsonUtils.scala in common/src/main/scala/models	47	8	14	30	3
NotificationsApiClient.scala in football/src/main/scala/com/gu/mobile/notifications/football/lib	60	2	13	22	8
DeliveryService.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker/delivery	90	2	13	14	12
ChannelApiClient.scala in liveactivities/src/main/scala/com/gu/liveactivities/service	117	3	13	11	5
NotificationReportRepository.scala in common/src/main/scala/tracking	92	4	13	14	8
Main.scala in registration/app/registration/controllers	113	5	12	11	4
MetricActor.scala in common/src/main/scala/metrics	93	3	12	13	6
Editions.scala in api-models/src/main/scala/com/gu/mobile.notifications.client/models	47	2	11	23	8
DynamoReportUpdater.scala in eventconsumer/src/main/scala/com/gu/notifications/events/dynamo	60	3	11	18	5
LegacyRegistrationConverter.scala in registration/app/registration/services	64	3	11	17	6
DynamoDistinctCheck.scala in football/src/main/scala/com/gu/mobile/notifications/football/lib	89	4	11	12	4
CloudWatch.scala in schedulelambda/src/main/scala/com/gu/notificationschedule/cloudwatch	83	8	11	13	3
NotificationParser.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker/utils	44	5	11	25	3
Platform.scala in common/src/main/scala/models	28	2	11	39	8
SqlRegistrationRepository.scala in common/src/main/scala/db	111	8	11	10	4
FrontendAlerts.scala in notification/app/notification/services/frontend	54	3	10	19	5
ProcessNotificationScheduleLambda.scala in schedulelambda/src/main/scala/com/gu/notificationschedule	95	5	10	11	3
Cloudwatch.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker/utils	115	6	10	9	3
Metrics.scala in liveactivities/src/main/scala/com/gu/liveactivities/util	65	2	10	15	5
AthenaLambda.scala in eventconsumer/src/main/scala/com/gu/notifications/events	87	8	9	10	2
AthenaMetrics.scala in eventconsumer/src/main/scala/com/gu/notifications/events	97	4	9	9	4
FootballMatchAuditor.scala in registration/app/registration/auditor	42	3	9	21	5
Reporting.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker/utils	24	2	9	38	6
SenderRequestHandler.scala in notificationworkerlambda/src/main/scala/com/gu/notifications/worker	95	4	9	9	3

• File complexity is the sum of the McCabe indexes (conditional complexity) of the units (methods, functions...) in a file.
• Files are classified in five categories based on that sum: 1-25 (simple files), 26-50 (slightly complex files), 51-125 (medium complex files), 126-250 (complex files), 251+ (very complex files). The default bands are five times the unit complexity bands, as a file is a group of units.
• Only main code files with units are classified. Files without units (languages without unit analysis, or files without functions) have no complexity to measure and are left out rather than counted as simple.
• A very complex file holds many decisions, which often means it has too many responsibilities: a candidate to split, and a place where changes need more testing.