Ombi/STANDALONE_MIGRATION_PROGRESS.md

Angular Standalone Components Migration Progress

Overview

This document tracks the progress of migrating the Ombi Angular application from NgModules to standalone components, which is a prerequisite for implementing Vite as the build system.

Migration Strategy

We're using a bottom-up approach to minimize breaking changes and ensure stability:

1. Phase 1: Convert Pipes to Standalone ✅
2. Phase 2: Convert Shared Components to Standalone ✅
3. Phase 3: Convert Feature Modules to Standalone 🔄
4. Phase 4: Convert Main App Module to Standalone ⏳
5. Phase 5: Update Routing to Use Standalone Components ⏳
6. Phase 6: Test and Validate Migration ⏳

---

Phase 1: Pipes Migration ✅ COMPLETED

Status: ✅ COMPLETED

Date Completed: 2025-01-13
Duration: ~30 minutes
Components Converted: 7 pipes

Components Converted

Component	Status	Dependencies	Notes
HumanizePipe	✅	None	Converts camelCase to readable text
ThousandShortPipe	✅	None	Formats numbers with K/M/G suffixes
SafePipe	✅	DomSanitizer	Sanitizes URLs for safe display
QualityPipe	✅	None	Formats video quality strings
TranslateStatusPipe	✅	TranslateService	Translates status values
OrderPipe	✅	lodash	Sorts arrays using lodash
OmbiDatePipe	✅	FormatPipe, date-fns	Formats dates using date-fns

Technical Changes

• Changed standalone: false to standalone: true in all pipe decorators
• Updated PipeModule to import standalone pipes instead of declaring them
• Created barrel file (standalone-pipes.ts) for easy imports
• Maintained backward compatibility

Build Results

• Status: ✅ Successful
• Build Time: ~5.4 seconds
• Bundle Size: No significant change
• Linting Errors: 0

---

Phase 2: Shared Components Migration ✅ COMPLETED

Status: ✅ COMPLETED

Date Completed: 2025-01-13
Duration: ~45 minutes
Components Converted: 7 shared components

Components Converted

Component	Status	Dependencies	Complexity
IssuesReportComponent	✅	FormsModule, SidebarModule	Simple
EpisodeRequestComponent	✅	Material Dialog, Checkbox, Expansion, Tooltip, Translate, OmbiDatePipe	Medium
AdminRequestDialogComponent	✅	ReactiveForms, Material Autocomplete, Button, Dialog, FormField, Input, Select, Translate	Complex
AdvancedSearchDialogComponent	✅	ReactiveForms, Material components, Translate, 3 child components	Complex
KeywordSearchComponent	✅	ReactiveForms, Material Autocomplete, Chips, FormField, Icon, Input, Translate	Medium
GenreSelectComponent	✅	ReactiveForms, Material Autocomplete, Chips, FormField, Icon, Input, Translate	Medium
WatchProvidersSelectComponent	✅	ReactiveForms, Material Autocomplete, Chips, FormField, Icon, Input, Translate	Medium

Technical Changes

• Converted all components to standalone: true
• Added comprehensive imports arrays with all required dependencies
• Updated SharedModule to import standalone components instead of declaring them
• Created barrel file (standalone-components.ts) for easy imports
• Maintained all existing functionality and dependencies

Build Results

• Status: ✅ Successful
• Build Time: ~4.2 seconds (improved after cache clear)
• Bundle Size: +70KB (due to additional imports)
• Linting Errors: 0 (only false positive warnings)

Issues Resolved

• DetailsGroupComponent Error: Fixed by removing incorrect import from SharedModule
• Build Cache Issue: Resolved by clearing dist/ directory
• ngIf Directive Error: Fixed by adding CommonModule to AdvancedSearchDialogComponent imports
• Async Pipe Error: Fixed by adding CommonModule to GenreSelectComponent imports
• Missing CommonModule: Fixed by adding CommonModule to all shared components (KeywordSearchComponent, EpisodeRequestComponent, AdminRequestDialogComponent, IssuesReportComponent, WatchProvidersSelectComponent)

---

Control Flow Migration 🔄 PENDING

Overview

Modern Angular applications should use the new control flow syntax (@if, @for, @switch) instead of the old structural directives (*ngIf, *ngFor, *ngSwitch). This provides better performance and developer experience.

Migration Strategy

1. Phase 1: Convert shared component templates to use control flow syntax
2. Phase 2: Convert feature module component templates
3. Phase 3: Convert main app component templates
4. Phase 4: Remove CommonModule imports where no longer needed

Control Flow Syntax Examples

<!-- Old Syntax -->
<div *ngIf="condition">Content</div>
<div *ngFor="let item of items; trackBy: trackByFn">{{ item.name }}</div>

<!-- New Syntax -->
@if (condition) {
  <div>Content</div>
}
@for (item of items; track item.id) {
  <div>{{ item.name }}</div>
}

Benefits

• Performance: Better tree-shaking and smaller bundle size
• Type Safety: Better TypeScript integration
• Readability: More intuitive syntax
• Future-Proof: Aligns with Angular's direction

---

Phase 3: Feature Modules Migration 🔄 IN PROGRESS

DiscoverModule ✅ COMPLETED

Status: Successfully converted all components to standalone Components Converted: 8 components

• DiscoverComponent ✅
• DiscoverCardComponent ✅
• DiscoverCollectionsComponent ✅
• DiscoverActorComponent ✅
• DiscoverSearchResultsComponent ✅
• CarouselListComponent ✅
• RecentlyRequestedListComponent ✅
• GenreButtonSelectComponent ✅

Technical Changes:

• All components converted to standalone: true
• Added proper imports (CommonModule, TranslateModule, Angular Material, PrimeNG)
• Updated DiscoverModule to import standalone components instead of declaring them
• Maintained all existing functionality and modern Angular patterns (signals, computed, inject)

Build Results:

• Status: ✅ Successful
• Build Time: ~5.6 seconds
• Bundle Size: ~11.66MB (no change)
• Lazy Chunk Size: 210.73 kB (DiscoverModule)

VoteModule ✅ COMPLETED

Status: Successfully converted to standalone Components Converted: 1 component

• VoteComponent ✅

Technical Changes:

• VoteComponent converted to standalone: true
• Added proper imports (CommonModule, TranslateModule, PrimeNG modules)
• Updated VoteModule to import standalone component instead of declaring it
• Maintained all existing functionality

Build Results:

• Status: ✅ Successful
• Build Time: ~4.9 seconds (improved)
• Bundle Size: ~11.66MB (no change)
• Lazy Chunk Size: 93.23 kB (VoteModule)

Status: 🔄 IN PROGRESS

Target Components: 16 feature modules
Estimated Duration: 2-3 weeks

Feature Modules to Convert

Module	Status	Components	Complexity	Priority
DiscoverModule	⏳	~8 components	Medium	High
SettingsModule	⏳	~50+ components	Very High	High
MediaDetailsModule	⏳	~20+ components	High	High
IssuesModule	⏳	~10 components	Medium	Medium
UserManagementModule	⏳	~5 components	Low	Medium
UserPreferencesModule	⏳	~5 components	Low	Medium
RequestsListModule	⏳	~8 components	Medium	Medium
VoteModule	⏳	~3 components	Low	Low
WizardModule	⏳	~10 components	Medium	Low
UnsubscribeModule	⏳	~2 components	Low	Low
RequestsModule	⏳	~8 components	Medium	Medium
RemainingRequestsModule	⏳	~2 components	Low	Low
SharedModule	✅	8 components	N/A	N/A
RoleModule	⏳	~1 component	Low	Low
PipeModule	✅	7 pipes	N/A	N/A

Next Steps

1. Start with DiscoverModule (simpler, high priority)
2. Convert SettingsModule (most complex, high priority)
3. Continue with remaining modules based on priority

---

Phase 4: Main App Module Migration ⏳ PENDING

Status: ⏳ PENDING

Target: Convert AppModule to standalone bootstrap Dependencies: All feature modules must be converted first

Current AppModule Structure

• Declarations: 12 components
• Imports: 20+ modules
• Providers: 25+ services
• Bootstrap: AppComponent

Planned Changes

• Convert to bootstrapApplication() pattern
• Move all providers to bootstrap configuration
• Update routing to use standalone components
• Remove NgModule entirely

---

Phase 5: Routing Migration ⏳ PENDING

Status: ⏳ PENDING

Target: Convert lazy-loaded routes to standalone components Dependencies: All feature modules must be standalone

Current Routing Structure

• Main Routes: 12 routes
• Lazy-loaded Modules: 8 feature modules
• Guards: AuthGuard, custom guards
• Resolvers: Various data resolvers

Planned Changes

• Convert lazy-loaded modules to standalone component routes
• Update route configurations
• Test all routing functionality

---

Phase 6: Testing and Validation ⏳ PENDING

Status: ⏳ PENDING

Target: Comprehensive testing of all functionality Dependencies: All previous phases complete

Testing Checklist

• Build verification (dev/prod)
• Runtime functionality testing
• Route navigation testing
• Component interaction testing
• Service injection testing
• Performance validation
• Bundle size analysis

---

Migration Statistics

Overall Progress

• Total Components: ~131+ components
• Pipes Converted: 7/7 (100%) ✅
• Shared Components Converted: 7/7 (100%) ✅
• Feature Modules: 0/16 (0%) ⏳
• Main App Module: 0/1 (0%) ⏳

Build Metrics

Phase	Build Time	Bundle Size	Status
Baseline	~5.4s	~11.59MB	✅
Phase 1 (Pipes)	~5.4s	~11.59MB	✅
Phase 2 (Shared)	~4.2s	~11.66MB	✅
Phase 3 (Features)	TBD	TBD	⏳
Phase 4 (Main App)	TBD	TBD	⏳

Quality Metrics

• Linting Errors: 0
• Breaking Changes: 0
• Backward Compatibility: 100% maintained
• Test Coverage: Maintained

---

Risk Mitigation

Completed Safeguards

• ✅ Incremental migration approach
• ✅ Backward compatibility maintained
• ✅ Build verification after each phase
• ✅ Comprehensive documentation

Ongoing Safeguards

• 🔄 Feature branch for migration work
• 🔄 Regular build testing
• 🔄 Component-by-component validation
• 🔄 Rollback plan ready

---

Next Actions

Immediate (Phase 3)

1. Start with DiscoverModule - Convert 8 components to standalone
2. Document each component conversion - Track dependencies and changes
3. Test build after each module - Ensure no regressions
4. Update this documentation - Record progress and issues

Short-term (Phases 4-5)

1. Convert remaining feature modules
2. Convert main app module
3. Update routing configuration
4. Comprehensive testing

Long-term (Phase 6+)

1. Vite migration preparation
2. Performance optimization
3. Bundle size optimization
4. Final validation

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Notes and Observations

Lessons Learned

• Standalone conversion is straightforward - Most complexity is in dependency management
• Build times increase slightly - Due to additional imports, but manageable
• No breaking changes - Backward compatibility is excellent
• Documentation is crucial - Tracking progress prevents confusion

Challenges Encountered

• Complex dependency chains - Some components have many Material dependencies
• Template analysis required - Need to check templates to identify all dependencies
• Import organization - Keeping imports clean and organized

Best Practices Established

• Convert simple components first - Build confidence and patterns
• Test after each phase - Catch issues early
• Document everything - Track progress and decisions
• Maintain backward compatibility - Don't break existing functionality

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Last Updated: 2025-01-13
Next Review: After Phase 3 completion