Archery Apprentice Documentation

live-scoring-vm-analysis

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LiveScoringViewModel Critical Analysis

File: app/src/main/java/com/archeryapprentice/ui/roundScoring/LiveScoringViewModel.kt Original Size: 2,808 lines (Oct 2025) Current Size: 1,481 lines (Oct 25, 2025) Total Reduction: 1,327 lines (47.3% reduction) Baseline (CLAUDE.md): 1,753 lines Analysis Date: October 4, 2025 Status: ✅ WEEK 3 COMPLETE - <1,500 LINE GOAL ACHIEVED

Week 3 Completion (Oct 25, 2025):

  • ✅ LiveScoringViewModel: 1,691 → 1,481 lines (210 line reduction, 12.4%)
  • ✅ EXCEEDED <1,500 line goal by 19 lines
  • ✅ Services extracted: EndStateTransitionService + ProgressUpdateService
  • ✅ 37 new tests, 100% pass rate, zero regressions
  • ✅ 1 critical bug fixed (negative index)

Cumulative Progress (Weeks 2-3):

  • Starting Point: 2,015 lines
  • Week 2 End: 1,677 lines (338 line reduction)
  • Week 3 End: 1,481 lines (210 line reduction)
  • Total: 534 lines removed (26.5% reduction)

Executive Summary

LiveScoringViewModel has experienced explosive 60% growth (1,753 → 2,808 lines) due to extensive tournament feature additions without architectural refactoring. The class now handles 12 distinct architectural domains across tournament synchronization, conflict resolution, real-time updates, and multi-device coordination.

Verdict: CONFIRMED GOD CLASS ANTIPATTERN with URGENT refactoring required.

Complexity Metrics

File Statistics

  • Total Lines: 2,808
  • Public Methods: 66 methods
  • Private Fields: 24 StateFlow properties, vars, and listeners
  • Data Classes Embedded: 6 (EndCompletionResult, SessionStateEvent, TournamentSyncStatus, ScoreConflict, etc.)
  • Enum Classes: 3 (SessionEventType, SyncErrorType, ConflictResolutionStrategy)
  • Coroutine Jobs: 3 listener cleanup jobs
  • Dependencies: 5 injected services + RepositoryFactory

Complexity Score: 9.5/10 (CRITICAL)

  • Maintainability: 1/10 (Poor)
  • Testability: 2/10 (Very Poor)
  • Refactoring Priority: IMMEDIATE

Root Cause Analysis: Why 60% Growth?

Tournament Feature Phases Added (Aug-Oct 2025)

PHASE 2.2: Real-Time Tournament Scoring

Lines Added: ~400 lines Features:

  • setupTournamentSync() - Firebase real-time listeners
  • syncTournamentScoresManually() - Manual sync on-demand
  • syncDetailedTournamentScores() - End-by-end sync
  • _incomingTournamentScores StateFlow
  • Score conflict detection system
  • _scoreConflicts StateFlow

PHASE 3.1: Live Leaderboard Integration

Lines Added: ~250 lines Features:

  • _liveLeaderboard StateFlow
  • leaderboardListenerJob cleanup
  • observeTournamentRoundState() - Round status tracking
  • _tournamentRoundState StateFlow
  • Leaderboard real-time updates

PHASE 4.1: Score Conflict Resolution

Lines Added: ~300 lines Features:

  • ScoreConflict data class with version tracking
  • ConflictResolutionStrategy enum
  • determineConflictResolution() - Strategy selection
  • resolveConflict() - Manual conflict resolution
  • dismissConflict() - Conflict dismissal
  • Enhanced error types with SyncErrorType enum
  • Retry mechanism with retry counts

PHASE 4+: Tournament Round Lifecycle

Lines Added: ~200 lines Features:

  • startTournamentRound() - Round start state management
  • pauseTournamentRound() - Round pause handling
  • completeTournamentRound() - Round completion sync
  • updateTournamentRoundStatus() - Status updates
  • roundStateListenerJob cleanup

Guest Ownership & Participant Tracking

Lines Added: ~150 lines Features:

  • _tournamentParticipants StateFlow
  • participantsListenerJob cleanup
  • Guest ownership indicators
  • Participant management sync

Total Tournament Features: ~1,300 lines (123% of baseline!)

Additional Growth Factors

1. Score Submission with Retry Logic

Lines: ~100 lines

  • submitTournamentScoreWithRetry() - Resilient Firebase writes
  • Exponential backoff retry mechanism
  • Transaction-based atomic updates

2. Multi-Participant State Management Fixes

Lines: ~80 lines

  • Critical fixes to participantArrows map updates
  • Participant switching coordination
  • switchParticipantWithEvents() enhancement

3. Enhanced Logging & Debugging

Lines: ~50 lines

  • Extensive MP_DEBUG logging throughout
  • TournamentSync diagnostic logs
  • RecordEndCompletion markers

12 Architectural Domains Identified

Domain Breakdown (Estimated Lines per Domain)

DomainLinesMethodsResponsibilitiesShould Be
1. Session State Management~3508Session initialization, state updates, current round tracking✅ Legitimate ViewModel
2. Arrow Input & Scoring~4507Arrow score input, coordinate tracking, validation, editing⚠️ Extract: ArrowInputService
3. End Completion & Finalization~4005End submission, completion detection, round advancement⚠️ Extract: EndCompletionService
4. Multi-Participant Switching~2004Participant switching, state coordination, progress tracking⚠️ Extract: ParticipantSwitchingService
5. Tournament Sync Setup~2003Firebase listener setup, repository initialization, cleanup🚨 Extract: TournamentSyncService
6. Real-Time Score Sync~4004Leaderboard sync, detailed score sync, incoming score handling🚨 Extract: TournamentSyncService
7. Score Conflict Detection~2503Conflict detection, version comparison, strategy determination🚨 Extract: ConflictResolutionService
8. Conflict Resolution~1502Manual resolution, dismissal, state updates🚨 Extract: ConflictResolutionService
9. Round Lifecycle Management~2004Round start/pause/complete, status updates, state observation🚨 Extract: TournamentRoundLifecycleService
10. Statistics & Progress~1506Live statistics, progress calculation, leaderboard totals⚠️ Extract: StatisticsAggregationService
11. Permissions & Validation~803Scoring permissions, validation, error messages✅ Uses ScoringPermissionService (good!)
12. Testing & Debug Support~803Test setters, debug logging, diagnostics✅ Acceptable for ViewModel

Legend:

  • ✅ Legitimate ViewModel responsibility
  • ⚠️ Should be extracted (medium priority)
  • 🚨 Must be extracted (high priority)

Critical Violations

1. Single Responsibility Principle 🚨 SEVERE

Evidence: 12 distinct architectural domains in one class

The class manages:

  • Session state (✅ legitimate)
  • Arrow input mechanics (should be service)
  • End completion logic (should be service)
  • Participant switching (should be service)
  • Firebase listener lifecycle (should be service)
  • Real-time synchronization (should be service)
  • Conflict detection (should be service)
  • Conflict resolution (should be service)
  • Round lifecycle (should be service)
  • Statistics aggregation (should be service)

2. State Explosion 🚨 SEVERE

24 StateFlow/private properties:

_scoringSession
_isProcessingScore
_errorMessage
_syncStatus                       // PHASE 4.1
_tournamentRoundState             // PHASE 3.1
_incomingTournamentScores         // PHASE 2.2
_scoreConflicts                   // PHASE 2.2
_liveLeaderboard                  // PHASE 3.1
_tournamentParticipants           // FIX for guest ownership
leaderboardListenerJob            // Cleanup
participantsListenerJob           // Cleanup
roundStateListenerJob             // Cleanup
currentRound
statisticsCache

3. Method Explosion 🚨 SEVERE

66 public/private methods handling unrelated concerns:

  • Arrow input: addArrowScore(), editArrowScore(), removeLastArrowScore(), updateArrowScore()
  • End completion: finalizeEnd(), completeCurrentEnd(), recordEndCompletion()
  • Participant: switchParticipant(), switchParticipantWithEvents()
  • Tournament sync: setupTournamentSync(), syncTournamentScoresManually(), syncDetailedTournamentScores()
  • Conflicts: determineConflictResolution(), resolveConflict(), dismissConflict()
  • Round lifecycle: observeTournamentRoundState(), startTournamentRound(), pauseTournamentRound(), completeTournamentRound()
  • Statistics: getCurrentLiveStatistics(), getParticipantStatistics(), leaderboardTotals()

4. UI Framework Coupling 🚨 CRITICAL VIOLATION

import androidx.compose.ui.geometry.Offset (Line 4)

Issue: ViewModel directly depends on Compose UI types Impact: Tight coupling to UI framework

5. Listener Management Complexity 🚨 HIGH RISK

3 coroutine listener jobs requiring careful cleanup:

leaderboardListenerJob?.cancel()
participantsListenerJob?.cancel()
roundStateListenerJob?.cancel()

Risk: Memory leaks if cleanup fails

Why This Happened: Development Pattern Analysis

Pattern 1: Incremental Feature Addition

Each tournament phase added features directly to LiveScoringViewModel:

  1. PHASE 2.2: Added sync methods → +400 lines
  2. PHASE 3.1: Added leaderboard → +250 lines
  3. PHASE 4.1: Added conflicts → +300 lines
  4. PHASE 4+: Added lifecycle → +200 lines

No refactoring between phases!

Pattern 2: “Just One More Method” Syndrome

Each new requirement seemed small in isolation:

  • “Just add tournament sync” → +50 lines
  • “Just add conflict detection” → +80 lines
  • “Just add retry logic” → +100 lines

But cumulatively: +1,055 lines!

Pattern 3: Copy-Paste State Management

Each tournament feature added its own StateFlow:

private val _incomingTournamentScores = MutableStateFlow(...)
private val _scoreConflicts = MutableStateFlow(...)
private val _liveLeaderboard = MutableStateFlow(...)
private val _tournamentRoundState = MutableStateFlow(...)
private val _tournamentParticipants = MutableStateFlow(...)

Problem: State proliferation without consolidation

Pattern 4: No Extraction Discipline

RoundViewModel refactoring was planned but never executed. LiveScoringViewModel followed same path: Plan to refactor “later” → Never happens!

Extraction Opportunities (Priority Order)

Priority 1: CRITICAL - Extract Tournament Sync Domain ✅ COMPLETED

Target: TournamentSyncService Lines to Extract: ~600 lines

Methods:

  • setupTournamentSync() (48 lines)
  • syncTournamentScoresManually() (43 lines)
  • syncTournamentScores() (18 lines)
  • syncDetailedTournamentScores() (140 lines)
  • submitTournamentScoreWithRetry() (129 lines)
  • updateParticipantTournamentScore() (42 lines)
  • observeTournamentRoundState() (77 lines)
  • updateTournamentRoundStatus() (30 lines)
  • updateTournamentParticipantProgressWithValues() (63 lines)

StateFlows to Move:

  • _syncStatus
  • _tournamentRoundState
  • _incomingTournamentScores
  • _liveLeaderboard
  • _tournamentParticipants

Listener Jobs:

  • leaderboardListenerJob
  • participantsListenerJob
  • roundStateListenerJob

Benefits:

  • Removes ~600 lines (21% reduction)
  • Isolates Firebase dependencies
  • Simplifies testing
  • Clear service boundary

Status: ✅ COMPLETED Oct 5, 2025 (556 lines extracted)

Priority 2: HIGH - Extract Conflict Resolution Domain ✅ COMPLETED

Target: ScoreConflictResolutionService Lines to Extract: ~400 lines

Methods:

  • determineConflictResolution() (38 lines)
  • resolveConflict() (61 lines)
  • dismissConflict() (25 lines)
  • Conflict detection logic from syncDetailedTournamentScores() (~200 lines)

Data Classes:

  • ScoreConflict
  • ConflictResolutionStrategy enum

StateFlows:

  • _scoreConflicts

Benefits:

  • Removes ~400 lines (14% reduction)
  • Separates complex conflict logic
  • Enables independent testing of conflict strategies

Status: ✅ COMPLETED Oct 2025 (262 lines extracted)

Priority 3: MEDIUM - Extract End Completion Domain ✅ COMPLETED

Target: EndCompletionService Lines to Extract: ~400 lines

Methods:

  • finalizeEnd() (73 lines)
  • completeCurrentEnd() (284 lines!)
  • recordEndCompletion() (95 lines)
  • fixEndFinalizedState() (22 lines)

Benefits:

  • Removes ~400 lines (14% reduction)
  • Simplifies critical scoring path
  • Clearer separation of concerns

Status: ✅ COMPLETED Oct 6, 2025 (400 lines extracted)

Additional Work (Oct 7):

  • Code deduplication: 109 lines removed from duplicate retry logic
  • Delegation pattern: EndCompletionService delegates to TournamentSyncService

Priority 4: MEDIUM - Extract Round Lifecycle Domain ⏳ PENDING

Target: TournamentRoundLifecycleService Lines to Extract: ~200 lines

Methods:

  • startTournamentRound() (19 lines)
  • pauseTournamentRound() (10 lines)
  • completeTournamentRound() (20 lines)
  • Round state observation integration (~150 lines across various methods)

Benefits:

  • Removes ~200 lines (7% reduction)
  • Clear lifecycle management boundary

Status: ⏳ TODO (per Implementation-Status-10-07-25)

Priority 5: LOW - Extract Statistics Aggregation ⏳ PENDING

Target: StatisticsAggregationService (may already exist!) Lines to Extract: ~150 lines

Methods:

  • getCurrentLiveStatistics() (8 lines)
  • getParticipantStatistics() (68 lines)
  • leaderboardTotals() (30 lines)
  • Statistics calculation helpers

Note: StatisticsCalculationService already injected - may just need to use it more!

Status: ⏳ TODO (per Implementation-Status-10-07-25)

Proposed Target Architecture

After Extraction: ~1,200-1,400 lines (50% reduction!)

LiveScoringViewModel (~1,200 lines) - Core coordination only
├── TournamentSyncService (~400 lines) ✅ COMPLETED
│   ├── Firebase listener management
│   ├── Real-time sync coordination
│   ├── Leaderboard updates
│   └── Participant tracking
├── ScoreConflictResolutionService (~250 lines) ✅ COMPLETED
│   ├── Conflict detection
│   ├── Resolution strategies
│   └── Conflict state management
├── EndCompletionService (~400 lines) ✅ COMPLETED
│   ├── End finalization logic
│   ├── Round advancement
│   └── Completion detection
├── TournamentRoundLifecycleService (~200 lines) ⏳ TODO
│   ├── Round start/pause/complete
│   ├── Status tracking
│   └── State observation
└── StatisticsAggregationService (~150 lines) ⏳ TODO
    ├── Live statistics
    ├── Progress calculation
    └── Leaderboard totals

Benefits:

  • Maintainability: 9/10 (from 1/10)
  • Testability: 9/10 (from 2/10)
  • Line Count: 1,200 (from 2,808, -57%)
  • Method Count: ~25 (from 66, -62%)
  • StateFlow Count: ~10 (from 24, -58%)
  • Complexity Score: 3/10 (from 9.5/10)

Current Progress (Oct 7, 2025):

  • Line Count: 2,304 (from 2,808, -18%)
  • Services Extracted: 3/5 (60%)
  • Lines Extracted: 1,218 (78% of target)
  • Code Deduplication: 109 lines removed
  • Remaining Work: 2 services (~350 lines)

Risk Assessment

Refactoring Risks

HIGH RISK: Tournament Sync Extraction ✅ MITIGATED

  • Risk: Breaking real-time Firebase listeners
  • Mitigation:
    • Extract service interface first
    • Implement with existing logic
    • Test multi-device sync thoroughly
    • Use feature flags for rollback
  • Status: ✅ COMPLETED Oct 5 - All tests passing

MEDIUM RISK: Conflict Resolution Extraction ✅ MITIGATED

  • Risk: Breaking conflict detection logic
  • Mitigation:
    • Preserve existing strategy logic
    • Add comprehensive conflict scenario tests
    • Validate version-based resolution
  • Status: ✅ COMPLETED Oct 2025 - All tests passing

MEDIUM RISK: End Completion Extraction ✅ MITIGATED

  • Risk: Breaking critical scoring path
  • Mitigation:
    • completeCurrentEnd() is 284 lines - extract carefully
    • Maintain transaction boundaries
    • Extensive unit testing
  • Status: ✅ COMPLETED Oct 6 - All tests passing

LOW RISK: Statistics Extraction

  • Risk: Minimal - mostly calculation
  • Mitigation: Leverage existing StatisticsCalculationService

Rollback Strategy

  1. Interface-First: Define service interfaces before extraction ✅
  2. Feature Flags: Control service usage
  3. Parallel Implementation: Keep old methods as fallback during migration
  4. Incremental: Extract one service at a time ✅
  5. Testing: Full integration test suite before each extraction ✅

Execution Roadmap

Phase 1: Planning & Setup (Week 1) ✅ COMPLETED

Phase 2: Critical Extraction (Week 2) ✅ COMPLETED

Priority 1: TournamentSyncService ✅

  • Extract ~600 lines ✅ (556 lines)
  • Move listener management ✅
  • Test real-time sync ✅
  • Validate Firebase integration ✅

Priority 2: ScoreConflictResolutionService ✅

  • Extract ~400 lines ✅ (262 lines)
  • Move conflict detection ✅
  • Test resolution strategies ✅
  • Validate version tracking ✅

Goal: Remove 1,000 lines (35% reduction) ✅ ACHIEVED

Phase 3: Secondary Extraction (Week 3) 🔄 IN PROGRESS

Priority 3: EndCompletionService ✅

  • Extract ~400 lines ✅ (400 lines)
  • Move completion logic ✅
  • Test scoring paths ✅
  • Validate round advancement ✅
  • Code deduplication: 109 lines removed ✅

Priority 4: RoundLifecycleService ⏳

  • Extract ~200 lines
  • Move lifecycle methods
  • Test state transitions

Goal: Remove additional 600 lines (21% reduction) - 400 complete, 200 pending

Phase 4: Cleanup & Optimization (Week 4) ⏳ PENDING

  • Enhance StatisticsAggregationService usage
  • Remove UI framework coupling (Offset → domain type)
  • Consolidate remaining StateFlows
  • Final integration testing
  • Performance validation

Final Goal: LiveScoringViewModel reduced to 1,200-1,400 lines (50-57% reduction)

Success Criteria

Quantitative Metrics

  • LiveScoringViewModel reduced from 2,808 to <1,500 lines (Current: 2,304, 82% to goal)
  • Public methods reduced from 66 to <30
  • StateFlow properties reduced from 24 to <12
  • All 1,000+ existing tests pass ✅ (1,879 tests passing)
  • Test coverage maintained >75% ✅
  • Performance within 5% of baseline ✅

Qualitative Goals

  • Clear service boundaries ✅
  • UI framework dependencies removed
  • Listener management simplified ✅
  • Tournament features isolated ✅
  • Conflict resolution testable independently ✅
  • Code complexity dramatically reduced ✅ (partial)

Architecture Validation

  • Each service <400 lines ✅
  • Single responsibility per service ✅
  • Clear dependency injection ✅
  • No god class antipattern (In progress: 2,304 → <1,500 target)
  • Testability score >8/10 ✅

Comparison to RoundViewModel Situation

Similarities:

  1. ✅ Both are god classes (2,808 and 2,079 lines)
  2. ✅ Both have extensive refactoring plans created
  3. ✅ Both grew organically with feature additions
  4. ✅ Both have clear extraction opportunities documented

Differences:

  1. ❌ RoundViewModel: 3 planning docs, ZERO work done
  2. ✅ LiveScoringViewModel: Analysis complete, 3/5 services extracted (60% complete)!

Critical Lesson:

PLANNING ≠ EXECUTION

RoundViewModel has 1,302 lines of planning documents with zero extraction. LiveScoringViewModel proved the approach works - execute incrementally, one service at a time.

Proven Pattern (Oct 2025):

✅ Copy-Delegate-Validate Pattern works:

  1. Copy methods to new service
  2. Delegate from ViewModel to service
  3. Validate with comprehensive tests
  4. Success rate: 100% (3/3 extractions successful)

✅ Delegation Pattern for shared logic:

  • Eliminate duplicate code through service-to-service delegation
  • Example: EndCompletionService → TournamentSyncService (109 lines removed)

Immediate Next Steps

Current Status (Oct 7, 2025):

  1. ✅ 3/5 Services Extracted - TournamentSync, ConflictResolution, EndCompletion
  2. ✅ Code Deduplication - 109 lines removed through delegation
  3. ✅ All Tests Passing - 1,879 tests, BUILD SUCCESSFUL
  4. ⏳ 2 Services Remaining - RoundLifecycle (~200 lines), Statistics (~150 lines)

Week 3 Service Extraction (Oct 22-25, 2025)

Services Extracted (KMP Migration Focus)

1. EndStateTransitionService (230 lines, 21 tests)

  • Purpose: Manages end state transitions when completing ends
  • Extracted From: LiveScoringViewModel lines 509-621 (normal completion) + lines 1057-1119 (final completion)
  • KMP Status: ⚠️ Partial (uses Compose UI Offset - see Technical Debt #5)
  • Test Coverage: 21 comprehensive tests (100% pass rate)
  • Responsibilities:
    • Update participant progress and mark complete
    • Calculate and update completed totals (score, arrow count, X count)
    • Build EndScoreWithArrows with unique IDs for LazyColumn keys
    • Clear participant state when appropriate
    • Advance to next end or mark participant complete
  • Key Feature: Single service handles both normal and final end completion with markComplete flag

2. ProgressUpdateService (85 lines, 13 tests)

  • Purpose: Handles real-time progress tracking and UI state updates
  • Extracted From: LiveScoringViewModel updateProgressImmediate() method (lines 722-770)
  • KMP Status: ✅ Fully compatible (zero Android dependencies)
  • Test Coverage: 13 comprehensive tests (100% pass rate)
  • Responsibilities:
    • Calculate current end progress and overall progress
    • Create live statistics
    • Determine animation duration based on UpdateSource
    • Build updated session with RealTimeProgress
  • Delegation Pattern: Delegates to ProgressCalculationService and StatisticsAggregationService

Metrics

  • Line Reduction: 1,691 → 1,481 lines (210 lines, 12.4% reduction)
  • Goal Achievement: 101.3% (EXCEEDED <1,500 target by 19 lines)
  • Tests Added: 37 tests (21 service + 13 service + 3 error case tests)
  • Bug Fixes: 1 critical (negative index in updateArrowScore)
  • Quality: Zero regressions, 100% test pass rate
  • Additional Improvements: Removed 4 debug/error logs, simplified null checks

Cumulative Progress (Weeks 2-3)

  • Starting Point (Week 2): 2,015 lines
  • Week 2 End: 1,677 lines (338 line reduction)
  • Week 3 Start: 1,691 lines (git branch baseline)
  • Week 3 End: 1,481 lines (210 line reduction)
  • Total Reduction: 534 lines (26.5% from Week 2 start)
  • Services Extracted: 6 services (Weeks 2-3)
  • Tests Added: 120 tests (83 Week 2 + 37 Week 3)

Technical Debt Discovered

Issue #5: EndStateTransitionService uses androidx.compose.ui.geometry.Offset (Android-only)

  • Impact: Prevents full KMP compatibility for this service
  • Root Cause: Inherited from ScoringSessionState coordinate model
  • Solution: Create DomainCoordinate model in shared:domain (Week 4 priority)
  • Documentation: Updated service to acknowledge dependency with TODO
  • Tracking: Technical Debt Item #5

Coverage Improvements & Bug Fixes

LiveScoringViewModel.kt (1,493 → 1,481 lines, 12 additional lines removed)

  • ✅ Removed 4 debug/error logs from defensive null checks
  • ✅ Fixed negative index bug in updateArrowScore (L357)
    • Changed: if (arrowIndex < arrows.size)
    • To: if (arrowIndex >= 0 && arrowIndex < arrows.size)
    • Prevents IndexOutOfBoundsException on negative indices
  • ✅ Added LiveScoringViewModelErrorCasesTest.kt (75 lines, 3 tests)
    • Test invalid score validation
    • Test bounds checking (out of bounds and negative index)
    • All tests passing

EndStateTransitionService.kt (226 → 230 lines)

  • ✅ Updated documentation to acknowledge Compose UI Offset dependency
  • ✅ Added TODO for KMP-compatible coordinate model
  • ✅ Simplified coordinate extraction (removed reflection, restored direct access)
  • ✅ Added test for L127 coverage (participantEndsWithArrows initialization)

Lessons Learned

  1. Coverage-Driven Improvements: Reviewing partial coverage revealed real bugs (negative index) and unnecessary complexity (debug logs)
  2. Honest Documentation: Better to acknowledge platform dependencies with TODO than claim “zero dependencies” incorrectly
  3. Simplicity Over Cleverness: Direct property access (coordinate?.x) is clearer than reflection-based extraction
  4. Going for Goals: When 34 lines away from <1,500 target, extracting ProgressUpdateService (41 line reduction) achieved the goal with room to spare

Documentation

Decision Point:

  • ✅ <1,500 Line Goal ACHIEVED: 1,481 lines (19 lines under target)
  • ✅ Week 3 COMPLETE: 2 services extracted, 37 tests added, 1 bug fixed
  • ⚠️ Tech Debt #5 Identified: DomainCoordinate model needed for full KMP compatibility
  • ✅ Pattern Proven: Copy-delegate-validate works consistently (5/5 successful extractions)

Conclusion

LiveScoringViewModel’s refactoring journey from 2,808 → 1,481 lines (47.3% reduction) demonstrates the effectiveness of incremental service extraction for god class refactoring.

Week 3 Achievement:

  • ✅ <1,500 Line Goal EXCEEDED: 1,481 lines (19 lines under target)
  • ✅ Services Extracted: 2 services (EndStateTransitionService + ProgressUpdateService)
  • ✅ Test Coverage: 37 new tests, 100% pass rate, zero regressions
  • ✅ Bug Fixes: 1 critical bug (negative index in updateArrowScore)
  • ✅ Quality: Zero test failures throughout entire extraction

Cumulative Progress (Weeks 2-3):

  • ✅ Starting Point: 2,015 lines
  • ✅ Week 2: 4 services extracted (338 line reduction)
  • ✅ Week 3: 2 services extracted (210 line reduction)
  • ✅ Total: 6 services, 534 lines removed (26.5% reduction)
  • ✅ 120 new tests added across all services

Critical Difference from RoundViewModel:

  • RoundViewModel: Planned but never executed
  • LiveScoringViewModel: ✅ WEEK 3 GOAL ACHIEVED - PROVEN PATTERN

Technical Debt Identified:

  • ⚠️ Issue #5: EndStateTransitionService uses Compose UI Offset (Android-only)
  • 📋 Solution: Create DomainCoordinate model in shared:domain (Week 4 priority)
  • 🔗 Tracking: Technical Debt #5

Pattern Proven: Copy-Delegate-Validate works consistently (6/6 successful extractions)

Risk Level: LOW - All extractions successful with zero regressions

Business Impact: HIGH - Enables continued KMP migration and prevents technical debt from blocking future features.

Next Steps:

  1. Resolve Technical Debt #5 (DomainCoordinate model)
  2. Continue KMP migration with remaining services
  3. Target: <1,400 lines (another 81 line reduction)

Analysis Date: October 4, 2025 Week 3 Completion: October 25, 2025 Analyst: Claude Code (Agent 3 - AAA) Status: ✅ WEEK 3 COMPLETE - <1,500 LINE GOAL ACHIEVED

Source: docs/LIVESCORINGVM_ANALYSIS.md (584 lines)

Related Documentation:

Graph View