Setup Core Skeleton Classes and Function Signatures

Core Skeleton Structure

Title: Setup Core Skeleton Classes and Function Signatures

Description:

Implement the core skeleton structure of the SDK with all necessary classes, interfaces, and function signatures.

Base Structures

1. Core Classes

// Base configuration
class MindPaystackConfig {
  final String publicKey;
  final Environment environment;
  final LogLevel logLevel;
  final RetryPolicy retryPolicy;
}

// Base client
abstract class MindPaystackClient {
  Future<T> get<T>(String endpoint);
  Future<T> post<T>(String endpoint, Map<String, dynamic> data);
  Future<T> put<T>(String endpoint, Map<String, dynamic> data);
  Future<T> delete<T>(String endpoint);
}

// Base models
abstract class BaseModel {
  Map<String, dynamic> toJson();
  static fromJson(Map<String, dynamic> json);
}

// Base states
abstract class PaymentState {}
class PaymentInitial extends PaymentState {}
class PaymentLoading extends PaymentState {}
class PaymentSuccess extends PaymentState {}
class PaymentError extends PaymentState {}

2. Payment Methods Interfaces

abstract class ICardPayment {
  Future<CardResponse> charge();
  Future<CardResponse> authorize(String otp);
  Future<CardResponse> validate();
}

abstract class IBankTransfer {
  Future<TransferResponse> initiate();
  Future<TransferResponse> verify();
  Stream<TransferStatus> monitorStatus();
}

abstract class IMobileMoney {
  Future<MomoResponse> initiate();
  Future<MomoResponse> verify();
}

abstract class IUSSD {
  Future<USSDResponse> generate();
  Stream<USSDStatus> monitorStatus();
}

3. Service Interfaces

abstract class IAuthenticationService {
  Future<AuthResponse> initialize();
  Future<AuthResponse> verify();
}

abstract class ITransactionService {
  Future<Transaction> create();
  Future<Transaction> verify();
  Future<List<Transaction>> list();
}

abstract class ICustomerService {
  Future<Customer> create();
  Future<Customer> retrieve();
  Future<Customer> update();
}

abstract class IWebhookService {
  Future<Webhook> register();
  Future<bool> verify();
}

4. Repository Interfaces

abstract class ITransactionRepository {
  Future<Transaction> getTransaction(String reference);
  Future<List<Transaction>> getTransactions();
  Future<void> saveTransaction(Transaction transaction);
}

abstract class ICustomerRepository {
  Future<Customer> getCustomer(String id);
  Future<void> saveCustomer(Customer customer);
}

abstract class ICardRepository {
  Future<void> saveCard(Card card);
  Future<List<Card>> getSavedCards();
}

Error Handling Structure

abstract class PaystackException implements Exception {
  final String message;
  final String code;
  final dynamic details;
}

class CardException extends PaystackException {}
class NetworkException extends PaystackException {}
class ValidationException extends PaystackException {}
class AuthenticationException extends PaystackException {}

Tasks

Core Structure

• Create base classes and interfaces
• Implement configuration management
• Setup error handling structure
• Create event system

Payment Methods

• Define payment method interfaces
• Create base implementation classes
• Setup payment flow controllers
• Implement state management

Services

• Create service interfaces
• Setup base service implementations
• Define repository contracts
• Implement data models

Utils

• Create validation utilities
• Setup logging system
• Implement encryption helpers
• Create type definitions

File Structure

lib/
├── src/
│   ├── config/
│   │   ├── mind_paystack_config.dart
│   │   └── environment.dart
│   ├── core/
│   │   ├── client.dart
│   │   ├── exceptions.dart
│   │   └── base_model.dart
│   ├── interfaces/
│   │   ├── payments/
│   │   ├── services/
│   │   └── repositories/
│   ├── models/
│   │   ├── payment/
│   │   ├── customer/
│   │   └── transaction/
│   ├── services/
│   │   ├── auth_service.dart
│   │   ├── payment_service.dart
│   │   └── customer_service.dart
│   ├── repositories/
│   │   ├── transaction_repository.dart
│   │   ├── customer_repository.dart
│   │   └── card_repository.dart
│   └── utils/
│       ├── validators.dart
│       ├── encryption.dart
│       └── logger.dart

Implementation Guidelines

1. Naming Conventions

   • Use clear, descriptive names
   • Follow Dart naming conventions
   • Keep consistency across similar components

2. Documentation

   • Add proper dartdoc comments
   • Include example usage
   • Document exceptions and edge cases

3. Type Safety

   • Use strong typing
   • Avoid dynamic types
   • Implement proper null safety

4. Testing Structure

   • Create test files for each component
   • Setup mock classes
   • Include example test cases

Success Criteria

• All base classes and interfaces implemented
• Proper documentation for all components
• Test structure setup
• Example implementation for each component
• Clean architecture principles followed
• Type safety ensured