# LifeTimer - Code Review Checklist

## Overview

This document provides a comprehensive code review checklist for the LifeTimer app, covering code quality, architecture, performance, and best practices.

## Code Quality

### General
- [ ] Code follows Flutter/Dart style guide
- [ ] Consistent naming conventions used
- [ ] Code is well-commented where necessary
- [ ] No commented-out code left in production
- [ ] No TODOs or FIXMEs in production code
- [ ] No debugging code left in production
- [ ] No hardcoded values (use constants)
- [ ] No magic numbers (use named constants)

### Structure & Organization
- [ ] File structure follows project guidelines
- [ ] Features properly separated
- [ ] No circular dependencies
- [ ] Proper use of folders and packages
- [ ] Clear separation of concerns
- [ ] Single Responsibility Principle followed
- [ ] DRY (Don't Repeat Yourself) principle followed

### Error Handling
- [ ] All async operations have error handling
- [ ] User-friendly error messages
- [ ] Errors logged appropriately
- [ ] No silent failures
- [ ] Proper exception handling
- [ ] Error boundaries where needed

## Architecture

### MVVM/Clean Architecture
- [ ] Models are simple data classes
- [ ] Views are stateless where possible
- [ ] ViewModels handle business logic
- [ ] Repositories abstract data access
- [ ] Dependency injection used
- [ ] No business logic in UI layer
- [ ] No UI logic in data layer

### State Management
- [ ] State management consistent across app
- [ ] Provider/Riverpod used correctly
- [ ] State is immutable
- [ ] State updates are efficient
- [ ] No unnecessary rebuilds
- [ ] Proper state disposal

### Navigation
- [ ] Navigation handled centrally
- [ ] Route names are constants
- [ ] Deep linking supported
- [ ] Navigation guards where needed
- [ ] Back button handling correct

## Performance

### Rendering
- [ ] No janky animations
- [ ] Efficient use of const constructors
- [ ] Proper use of keys in lists
- [ ] Avoid unnecessary rebuilds
- [ ] Use of RepaintBoundary where needed
- [ ] Efficient image loading

### Memory
- [ ] No memory leaks
- [ ] Proper disposal of controllers
- [ ] Proper disposal of streams
- [ ] Proper disposal of timers
- [ ] Efficient use of caches
- [ ] Memory usage within limits

### Network
- [ ] Efficient API calls
- [ ] Proper caching implemented
- [ ] Offline mode handled
- [ ] Request/response optimization
- [ ] No unnecessary network calls

### Battery
- [ ] Efficient background operations
- [ ] Proper use of timers
- [ ] Efficient location services
- [ ] No unnecessary wake locks
- [ ] Efficient push notifications

## Testing

### Unit Tests
- [ ] Business logic tested
- [ ] Utility functions tested
- [ ] Models tested
- [ ] Repositories tested (with mocks)
- [ ] High test coverage (>70%)

### Widget Tests
- [ ] Key widgets tested
- [ ] User interactions tested
- [ ] State changes tested
- [ ] Error states tested
- [ ] Loading states tested

### Integration Tests
- [ ] Critical flows tested
- [ ] Authentication flow tested
- [ ] Goal creation flow tested
- [ ] Countdown flow tested

## Security

### Authentication
- [ ] Secure session management
- [ ] Proper token handling
- [ ] Secure logout
- [ ] No credentials in logs

### Data Protection
- [ ] Input validation
- [ ] Output encoding
- [ ] Secure storage
- [ ] No sensitive data in logs

### API Security
- [ ] Proper error handling
- [ ] Rate limiting
- [ ] No hardcoded secrets
- [ ] Secure API calls

## Accessibility

### Visual
- [ ] Sufficient color contrast
- [ ] Scalable text
- [ ] Clear visual hierarchy
- [ ] Proper spacing

### Screen Readers
- [ ] Semantic labels added
- [ ] Buttons properly labeled
- [ ] Images have alt text
- [ ] Progress indicators announced

### Navigation
- [ ] Keyboard navigation supported
- [ ] Touch targets appropriate size
- [ ] Focus management correct
- [ ] No traps

## Best Practices

### Flutter/Dart
- [ ] Use of async/await correctly
- [ ] Proper use of streams
- [ ] Efficient use of futures
- [ ] Proper use of isolates if needed
- [ ] No blocking operations on main thread

### Supabase
- [ ] Proper use of RLS policies
- [ ] Efficient queries
- [ ] Proper error handling
- [ ] No N+1 queries
- [ ] Proper use of indexes

### Third-Party Libraries
- [ ] Libraries are well-maintained
- [ ] Libraries are up to date
- [ ] No duplicate functionality
- [ ] Proper integration
- [ ] License compliance

## Documentation

### Code Documentation
- [ ] Public APIs documented
- [ ] Complex logic explained
- [ ] Architecture documented
- [ ] Dependencies documented
- [ ] Setup instructions clear

### User Documentation
- [ ] Help content available
- [ ] FAQ available
- [ ] Onboarding clear
- [ ] Error messages helpful
- [ ] Settings explained

## Platform-Specific

### iOS
- [ ] Follows Human Interface Guidelines
- [ ] Proper use of iOS widgets
- [ ] Proper use of iOS APIs
- [ ] No iOS-specific bugs
- [ ] Proper iOS permissions

### Android
- [ ] Follows Material Design
- [ ] Proper use of Android widgets
- [ ] Proper use of Android APIs
- [ ] No Android-specific bugs
- [ ] Proper Android permissions

## Localization

### Internationalization
- [ ] Strings externalized
- [ ] No hardcoded strings
- [ ] Proper date/time formatting
- [ ] Proper number formatting
- [ ] RTL support considered

### Translation
- [ ] All user-facing text translatable
- [ ] No concatenated strings
- [ ] Proper context for translations
- [ ] Pluralization handled
- [ ] Gender handled if needed

## Feature-Specific

### Authentication
- [ ] Sign up flow works
- [ ] Sign in flow works
- [ ] Password reset works
- [ ] OAuth flows work
- [ ] Session persistence works

### Goals
- [ ] Goal creation works
- [ ] Goal editing works
- [ ] Goal deletion works
- [ ] Progress tracking works
- [ ] Goal completion works

### Countdown
- [ ] Countdown displays correctly
- [ ] Countdown updates in real-time
- [ ] Countdown start works
- [ ] Countdown lock works
- [ ] Countdown completion works

### Social
- [ ] Following works
- [ ] Feed displays correctly
- [ ] Leaderboards work
- [ ] Achievements unlock
- [ ] Privacy settings work

### Settings
- [ ] Profile editing works
- [ ] Theme switching works
- [ ] Notification settings work
- [ ] Privacy settings work
- [ ] Account deletion works

## Edge Cases

### Network
- [ ] Offline mode handled
- [ ] Slow network handled
- [ ] Network errors handled
- [ ] Timeout handling
- [ ] Retry logic

### Data
- [ ] Empty states handled
- [ ] Large datasets handled
- [ ] Corrupted data handled
- [ ] Missing data handled
- [ ] Data conflicts handled

### User Input
- [ ] Invalid input handled
- [ ] Malicious input handled
- [ ] Large input handled
- [ ] Special characters handled
- [ ] Unicode handled

## Release Readiness

### Build
- [ ] Release build compiles
- [ ] No compilation warnings
- [ ] No linting errors
- [ ] ProGuard/R8 configured (Android)
- [ ] Code signing configured

### Testing
- [ ] All tests pass
- [ ] Integration tests pass
- [ ] Manual testing completed
- [ ] Beta testing completed
- [ ] Critical bugs fixed

### Documentation
- [ ] README updated
- [ ] CHANGELOG updated
- [ ] Release notes prepared
- [ ] App store descriptions ready
- [ ] Screenshots ready

## Review Process

### Before Review
1. Ensure code compiles
2. Run all tests
3. Run linter
4. Check for TODOs/FIXMEs
5. Update documentation

### During Review
1. Read code thoroughly
2. Check against checklist
3. Ask questions if unclear
4. Suggest improvements
5. Note any issues

### After Review
1. Discuss findings
2. Create action items
3. Prioritize issues
4. Track progress
5. Verify fixes

## Severity Definitions

### Critical
- Blocks release
- Causes crashes
- Data loss possible
- Security vulnerability

### High
- Major functionality broken
- Poor UX
- Performance issue
- Accessibility violation

### Medium
- Minor functionality issue
- Code quality issue
- Documentation missing
- Best practice violation

### Low
- Cosmetic issue
- Style issue
- Minor optimization
- Nice-to-have improvement

## Tools

### Code Analysis
- **Dart Analyzer**: `flutter analyze`
- **Linter**: `flutter analyze --fatal-infos`
- **Format**: `dart format .`

### Testing
- **Unit Tests**: `flutter test`
- **Widget Tests**: `flutter test`
- **Integration Tests**: `flutter test integration_test`

### Coverage
- **Coverage**: `flutter test --coverage`
- **Report**: `genhtml coverage/lcov.info -o coverage/html`

### Performance
- **Flutter DevTools**: Performance profiling
- **Timeline**: Frame rendering
- **Memory**: Memory profiling

## Next Steps

1. Complete code review using this checklist
2. Document all findings
3. Create action items
4. Implement fixes
5. Re-review changes
6. Update documentation
7. Prepare for release

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## Notes

Use this section to document specific findings, recommendations, or notes during the code review process.

| Date | File | Issue | Severity | Status | Notes |
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