Project Journal — Oct 7, 2025

Phase 3: ViewModel Refactoring — Code Deduplication & Bug Fixes

What we shipped — Code Quality Improvement + Bug Prevention (Oct 7)

🎯 Code Deduplication — 109 Lines Removed from EndCompletionService

✅ Duplicate Retry Logic Eliminated: Removed 109-line duplicate submitTournamentScoreWithRetry method
✅ Delegation Pattern Implemented: EndCompletionService now delegates to TournamentSyncService
✅ Callback Support Added: Optional onSyncStatusUpdate parameter for status propagation
✅ Single Source of Truth: Retry/backoff logic centralized in TournamentSyncService
✅ All Tests Passing: 1,879 tests successful, BUILD SUCCESSFUL

🐛 Bug Fix: Process Recreation UI Desync Prevention

Issue: getParticipantCurrentEnd hardcoded fallback to 1 after process recreation
Root Cause: When participantProgress is null, function returned hardcoded 1 instead of current session state
Impact: Potential UI desync showing end 1 when user was on end 3+ after app process recreation
Solution: Changed fallback from 1 to session.currentEndNumber
Result: Proper session state preservation, no UI confusion after process recreation
Location: EndCompletionService.kt:453

🔧 Test Infrastructure Updates: Dependency Injection

Updated: 8 test files to inject TournamentSyncService into EndCompletionService
Pattern: Real services with mocked dependencies (established pattern from Oct 6)
Cleanup: Deleted 2 redundant test files (EndCompletionServiceRetryTest, EndCompletionServiceEventsTest)
Rationale: Tests covered duplicate logic that was removed

Technical Implementation Achievements

Code Deduplication Success (100% Complete)

The Duplicate Code Problem

Discovery: Copilot PR comment identified 109 lines of duplicate retry logic in:

EndCompletionService.submitTournamentScoreWithRetry (private method)
TournamentSyncService.submitTournamentScoreWithRetry (public method)

Problem: Maintenance burden, drift risk, violation of DRY principle

Solution Architecture

1. Dependency Injection:

class EndCompletionService @Inject constructor(
    private val application: Application,
    private val roundRepository: RoundRepository,
    private val repositoryFactory: RepositoryFactory?,
    private val tournamentSyncService: TournamentSyncService,  // NEW
    private val serviceScope: CoroutineScope? = null
)

2. Callback Pattern for Status Updates:

suspend fun submitTournamentScoreWithRetry(
    // ... parameters
    onSyncStatusUpdate: ((TournamentSyncStatus) -> Unit)? = null  // NEW
): Boolean {
    _syncStatus.value = syncingStatus
    onSyncStatusUpdate?.invoke(syncingStatus)  // Propagate to caller
}

3. Delegation in EndCompletionService:

scope.launch {
    val success = tournamentSyncService.submitTournamentScoreWithRetry(
        tournamentId = round.tournamentId ?: return@launch,
        participantId = session.currentParticipantId,
        roundNumber = round.tournamentRoundNumber ?: 1,
        endNumber = endNumber,
        arrowScores = arrowScores,
        isXFlags = isXFlags,
        deviceId = deviceId,
        maxRetries = 3,
        onSyncStatusUpdate = onSyncStatusUpdate  // Pass callback through
    )
}

4. Removed Duplicate Code: Deleted 109 lines from EndCompletionService

Bug Fix: Process Recreation Fallback (100% Complete)

The Hardcoded Fallback Problem

Before - Hardcoded fallback:

private fun getParticipantCurrentEnd(participantId: String, session: ScoringSessionState): Int {
    session.participantCurrentEnd[participantId]?.let { return it }
    
    val participantProgress = session.participantProgress[participantId]
    return if (participantProgress != null) {
        participantProgress.endsCompleted + 1
    } else {
        1  // ⚠️ PROBLEM: Hardcoded fallback
    }
}

Problem Scenario:

User scores 3 ends (currently on end 4)
Android kills app process
User reopens app → session restored
participantProgress might be null during restoration
Function returns 1 instead of 4 → UI shows wrong end number

After - Session-aware fallback:

private fun getParticipantCurrentEnd(participantId: String, session: ScoringSessionState): Int {
    session.participantCurrentEnd[participantId]?.let { return it }
    
    val participantProgress = session.participantProgress[participantId]
    return if (participantProgress != null) {
        participantProgress.endsCompleted + 1
    } else {
        session.currentEndNumber  // ✅ FIXED: Use session state
    }
}

Architecture Decisions — Delegation & Callback Patterns

Delegation Pattern Over Code Duplication

Principle: When two services need the same behavior, delegate to a shared service instead of duplicating code

Benefits:

Single source of truth
Easier to test (test once)
Easier to maintain (fix once)
Reduced code size
No drift risk

Callback Pattern for Status Propagation

Principle: When a delegating service needs status updates, use optional callbacks instead of polling

Implementation:

// Optional callback parameter (backward compatible)
suspend fun submitTournamentScoreWithRetry(
    // ... parameters
    onSyncStatusUpdate: ((TournamentSyncStatus) -> Unit)? = null
): Boolean {
    _syncStatus.value = newStatus
    onSyncStatusUpdate?.invoke(newStatus)  // Propagate to caller
}

Session State as Fallback Pattern

Principle: When individual state might be null after restoration, fall back to session-level state

Application: Check individual state → calculated state → session state (not hardcoded value)

Testing — All Tests Passing

Test Suite Status (100% Passing)

Build Result: BUILD SUCCESSFUL ✅
Total Tests: 1,879 tests
Failed Tests: 0 ✅
Test Duration: ~1 minute 16 seconds

Coverage Validated:

Retry logic with exponential backoff ✅
Error classification (NETWORK_ERROR, TIMEOUT, VALIDATION_ERROR) ✅
Status update propagation ✅
Callback invocation ✅
Max retry handling ✅

What’s Next — Complete LiveScoringViewModel Extraction

EXTRACTION PROGRESS SUMMARY

Completed Extractions (3/5 services):

✅ TournamentSyncService - 556 lines (October 5)
✅ ScoreConflictResolutionService - 262 lines (October 2025)
✅ EndCompletionService - 400 lines (October 6)

Today’s Work:

✅ Code Quality: Eliminated 109 lines of duplicate code
✅ Bug Prevention: Fixed process recreation fallback
✅ Test Cleanup: Removed 2 redundant test files

Total Progress:

Lines Extracted: 1,218 lines (3 service extractions)
Lines Removed: 109 lines (code deduplication)
ViewModel Reduction: 2,808 → 2,304 lines (18% reduction)
Progress: 61% complete (3/5 services)
Target: ~1,900 lines (coordinator role only)

Remaining Work (2/5 services):

🔲 TournamentRoundLifecycleService (~200 lines)
🔲 StatisticsAggregationService (~150 lines)
Estimated Effort: 1-2 weeks

Impact Summary

Code Quality Improvement Success

✅ CODE DEDUPLICATION: 109 lines of duplicate retry logic eliminated
✅ DELEGATION PATTERN: EndCompletionService delegates to TournamentSyncService
✅ SINGLE SOURCE OF TRUTH: Retry logic only in TournamentSyncService
✅ ALL TESTS PASSING: 1,879 tests, BUILD SUCCESSFUL
✅ CALLBACK PATTERN: Optional status update propagation added

Bug Prevention

✅ PROCESS RECREATION FIX: Fallback uses session.currentEndNumber instead of hardcoded 1
✅ UI DESYNC PREVENTED: No confusion after app process recreation
✅ EDGE CASE HANDLED: Null participantProgress gracefully handled

Test Infrastructure Improved

✅ TEST CLEANUP: Removed 2 redundant test files
✅ COVERAGE MAINTAINED: Retry logic tested in TournamentSyncServiceTest
✅ DEPENDENCY INJECTION: 8 test files updated with mock TournamentSyncService
✅ REAL SERVICES PATTERN: Continues from Oct 6 established pattern

Final Assessment — Code Quality and Bug Prevention

Code Deduplication Success

Addressed Copilot PR comment by eliminating 109 lines of duplicate retry logic from EndCompletionService. Implemented delegation pattern with TournamentSyncService as single source of truth. Added optional callback pattern for status propagation while maintaining backward compatibility.

Proactive Bug Fix

Fixed potential UI desync bug in getParticipantCurrentEnd by changing fallback from hardcoded 1 to session.currentEndNumber. Prevents user confusion after app process recreation when participantProgress might be null.

Next Session Focus

Continue ViewModel refactoring by extracting final 2 services (TournamentRoundLifecycle and StatisticsAggregation). Target remains ~1,900 lines (coordinator role only), down from current 2,304 lines. Estimated 1-2 weeks remaining.

Source: docs/project-journal(10-07-25).md (553 lines total)
See Also: Tech-Debt, LiveScoringVM-Analysis, EndCompletionService

This session focused on code quality improvement through deduplication and proactive bug prevention. Eliminated 109 lines of duplicate retry logic through delegation pattern and fixed potential process recreation UI desync. All 1,879 tests passing with streamlined test suite.

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