# Modularization Progress Report

## Completed Tasks ✅

### Phase 1: Foundation (COMPLETED)

1. ✅ **Core Interfaces Created**
   - `/src/core/interfaces/repositories/` - All repository interfaces
   - `/src/core/interfaces/services/` - All service interfaces
   - Clean exports via index.ts files

2. ✅ **Repository Implementations**
   - `PaymentRepository` - Full CRUD for payments
   - `MessageRepository` - ISO message data access
   - `OperatorRepository` - Operator management
   - `SettlementRepository` - Settlement tracking

3. ✅ **Services Converted to Instance-Based with DI**
   - `MessageService` - Now uses repositories, accepts dependencies via constructor
   - `TransportService` - Now accepts IMessageService via constructor
   - `LedgerService` - Now uses PaymentRepository, accepts adapter via constructor
   - `ScreeningService` - New instance-based service (replaces ScreeningEngine)

4. ✅ **Simple DI Container**
   - `ServiceContainer` class for service registration and resolution
   - Factory pattern support

## In Progress 🔄

### Phase 2: Core Orchestration

- **PaymentWorkflow** - Needs to be refactored to accept all services via constructor
- **DI Container Setup** - Need to wire all services together
- **Route Updates** - Update route handlers to use DI container

## Remaining Tasks 📋

### Critical
1. **Refactor PaymentWorkflow** 
   - Accept all services via constructor (ILedgerService, IMessageService, ITransportService, IScreeningService)
   - Replace direct database queries with repository calls
   - Update all static method calls

2. **Update Route Handlers**
   - Wire services via DI container
   - Update PaymentWorkflow instantiation
   - Update all static service calls

3. **Create Service Initialization**
   - Setup function to initialize all repositories
   - Setup function to initialize all services
   - Wire dependencies correctly

### Important
4. **Add Index Files**
   - Create index.ts files for all modules for clean exports
   - Update imports to use path aliases consistently

5. **Testing**
   - Update existing tests to use new structure
   - Create mock repositories for testing

## Migration Notes

- Old static `ScreeningEngine` is preserved for backward compatibility
- New `ScreeningService` provides instance-based implementation
- All services now implement their respective interfaces
- Repository pattern separates data access from business logic

## Breaking Changes

⚠️ **Services are no longer static** - All service methods must be called on instances
⚠️ **Constructor injection required** - Services must be instantiated with dependencies
⚠️ **Repository pattern** - Database queries are now in repositories, not services

## Next Steps

1. Complete PaymentWorkflow refactoring
2. Create service initialization/bootstrap file
3. Update app.ts to use DI container
4. Update all route files
5. Test thoroughly
6. Update documentation