week-5-service-migration

Week 5: Service Migration to shared:domain

Date: 2025-10-25 Agent: Agent 3 (AAA - Architecture & Analytics) Duration: 8 hours Status: ✅ COMPLETE

Overview

First service successfully migrated to shared:domain, validating the service extraction pattern for KMP migration.

Deliverables

1. ParticipantProgress.kt

• Type: Data model
• Location: shared/domain/src/commonMain/kotlin/.../models/
• Features:
  • Pure Kotlin data class
  • kotlinx.datetime.Instant (KMP-compatible)
  • Sync metadata (version, updatedAt, isDirty)

2. ProgressTrackingService.kt

• Type: Business logic service
• Location: shared/domain/src/commonMain/kotlin/.../services/
• Features:
  • 11 pure functions (zero side effects)
  • Manual DI (no Hilt)
  • Constructor injection pattern

3. ProgressTrackingServiceTest.kt

• Type: Unit tests
• Coverage: 83% patch coverage
• Test count: 30+ test cases

5-Step Service Migration Pattern

This pattern was validated by PR #144:

1. Remove Hilt annotations (@Inject, @Singleton)
2. Convert to constructor injection (manual DI)
3. Replace java.time with kotlinx.datetime
4. Verify zero Android dependencies
5. Add comprehensive unit tests

Impact

• ✅ Demonstrates service extraction viability for KMP
• ✅ Establishes reusable pattern
• ✅ Zero regressions (2051/2051 tests passing)

Blockers

1. DomainCoordinate pattern incomplete: Needs broader application before migrating coordinate-dependent services
2. Firebase dependencies: Firebase-dependent services blocked until Week 9 (FirebaseDataSource abstraction)

Next Steps

• Week 6+: Continue migrating pure services
• Apply DomainCoordinate pattern to more models
• Prepare for Week 9 Firebase abstraction

Metrics

Metric	Value
Lines migrated	300+
Tests added	30+
Patch coverage	83%
Duration	8 hours
Regressions	0

PR

#144: https://github.com/blamechris/archery-apprentice/pull/144 (MERGED) Reviewed by: Agent 1 (AAP) - Approved with zero changes