Field Handlers: Modular field processing with dependency chains
Conditional States: Dynamic field behavior (readonly, disabled, hidden, required)
Service Integration: Real-time updates via HTMX
Pricing Display: Inline costs and unified summary

BusProNet Integration

XML API Client: Request/response handling
Data Processing: API response transformation
Caching Layer: Performance optimization
Error Handling: Comprehensive error management

Service Layer

Booking Management: Core workflow orchestration
Travel Data Services: API data access and caching
Pricing Calculations: Real-time cost computation
Field Options: Dynamic choice generation

🎯 Feature Status Matrix

Feature	Planning	Implementation	Testing	Completed
Multi-Step Booking	✅	✅	✅	✅
Room Selection	✅	✅	✅	✅
Service Selection	✅	✅	✅	✅
Pricing Display	✅	✅	✅	✅
Transportation Services	✅	✅	✅	✅
Conditional Field States	✅	✅	✅	✅
HTMX Integration	✅	✅	✅	✅
BPN API Integration	✅	✅	✅	✅
Dynamic Availability System	✅	✅	✅	✅
Service Descriptions	✅	✅	✅	✅
License Plate Field	✅	✅	✅	✅
Age-Based Constraints	✅	🔄	⏳	⏳
Advanced Pricing	✅	⏳	⏳	⏳

Legend: ✅ Complete | 🔄 In Progress | ⏳ Planned

🔧 Implementation Patterns

Field Handler Pattern

class ParticipantTransportationOutboundFieldHandler extends AbstractParticipantFieldHandler
{
    public function getFieldName(): string { return 'transportationOutbound'; }
    public function getDependencies(): array { return ['assignedRoomId']; }
    public function shouldProcess(/* ... */): bool { /* conditional logic */ }
    public function processField(/* ... */): void { /* field processing */ }
}

Conditional Field States

$this->fieldStateConditions['advancedServices'] = [
    'hidden' => new AgeRangeCondition(null, 15),
    'required' => FieldValueCondition::equals('roomType', 'suite'),
];

Service Registration

# config/services.yaml
App\Form\Service\ParticipantTransportationOutboundFieldHandler:
    tags: [{ name: 'app.participant_field_handler', priority: 100 }]

App\Service\ServiceAvailabilityCalculator:
    # Automatically registered via autowiring

🧪 Testing Strategy

Test Coverage Areas

Unit Tests: Service layer and business logic
Integration Tests: Form processing and API communication
Field Handler Tests: Conditional logic and dependencies
XML Processing Tests: BPN API response parsing

Test Commands

# All tests
./vendor/bin/phpunit

# Specific areas
./vendor/bin/phpunit tests/Service/          # Service layer
./vendor/bin/phpunit tests/BusProNet/        # API integration
./vendor/bin/phpunit tests/Form/             # Form processing

# Test availability system
bin/console debug:container ServiceAvailabilityCalculator

📈 Performance Considerations

Optimization Strategies

Lazy Loading: Field handlers loaded on demand
Caching: API responses and computed choices
Dependency Tracking: Efficient field state updates
HTMX Optimization: Targeted DOM updates

Monitoring Points

Form rendering performance
HTMX response times
BPN API communication latency
Database query optimization
Service availability calculation performance

🔄 Development Workflow

Adding New Features

Plan: Create implementation plan document
Design: Define interfaces and data structures
Implement: Follow established patterns
Test: Unit and integration testing
Document: Update relevant documentation
Deploy: Production deployment with monitoring

Code Standards

PSR-12 compliance with declare(strict_types=1)
PHP 8+ features (typed properties, constructor promotion)
Immutable DateTime objects
Explicit comparisons and type safety
Comprehensive documentation

External Documentation

Project-Specific Guides

../CLAUDE.md: AI development assistance guidelines
Installation & Setup: See main README.md
API Integration: BusProNet XML API documentation (internal)
Deployment: Production deployment procedures (internal)

🎯 Future Roadmap

Planned Enhancements

Age-Based Field Constraints: Complete implementation
Advanced Pricing Features: Discounts, taxes, multi-currency
Enhanced BPN Integration: Extended API coverage
Mobile Optimization: Responsive design improvements
Analytics Integration: User behavior tracking
Cross-Session Availability: Extend availability tracking beyond single sessions
API Availability Validation: Implement final validation stage against BusProNet API before booking confirmation

Technical Debt

Code Coverage: Increase test coverage to 90%+
Performance Optimization: Form rendering improvements
Documentation: API endpoint documentation
Monitoring: Enhanced logging and metrics
Availability Testing: Comprehensive test coverage for availability system
API Validation Integration: Implement real-time availability validation via BusProNet API

Documentation Maintained By: Development Team
Last Updated: 2025-01-XX
Version: 2.0
Status: ✅ Current and Comprehensive

For development assistance, see CLAUDE.md for AI-specific guidelines and project context.

MyEP Next Booking - Documentation Index

📋 Documentation Overview

Core Architecture Documentation

Feature Implementation Guides

Development & Maintenance

🏗️ System Architecture Overview

Multi-Step Booking Flow

Core Components

Form System Architecture