🏗️ Mobile Technical Architecture

This document provides a comprehensive overview of the ComDEALL mobile application's technical architecture, including system design, data flow, and implementation details.

🎯 Architecture Overview

The mobile app follows a layered architecture pattern with clear separation of concerns:

┌─────────────────────────────────────────────────────────────┐
│                    Presentation Layer                        │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐        │
│  │   Screens   │  │ Components  │  │ Navigation  │        │
│  └─────────────┘  └─────────────┘  └─────────────┘        │
└─────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────┐
│                    Business Logic Layer                     │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐        │
│  │   Hooks     │  │  Contexts   │  │   Utils     │        │
│  └─────────────┘  └─────────────┘  └─────────────┘        │
└─────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────┐
│                    Data Layer                               │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐        │
│  │   Apollo    │  │    Redux    │  │    MMKV     │        │
│  └─────────────┘  └─────────────┘  └─────────────┘        │
└─────────────────────────────────────────────────────────────┘
┌─────────────────────────────────────────────────────────────┐
│                    External Services                        │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐        │
│  │  GraphQL    │  │   Socket.IO  │  │   Firebase  │        │
│  └─────────────┘  └─────────────┘  └─────────────┘        │
└─────────────────────────────────────────────────────────────┘

📱 Core Technologies

Framework & Runtime

• React Native: Cross-platform mobile development
• Expo: Development platform and build tools
• TypeScript: Type-safe JavaScript development
• JavaScript Engine: Hermes

State Management

• Redux Toolkit: Predictable state container
• React Context: Component-level state sharing
• MMKV Storage: Fast key-value storage
• Apollo Cache: GraphQL data caching

Navigation

• React Navigation v6: Navigation library
• Stack Navigator: Hierarchical navigation
• Tab Navigator: Bottom tab navigation

🏗️ Project Structure

src/
├── components/           # Reusable UI components
│   ├── common/          # Shared components
│   ├── parent/          # Parent-specific components
│   └── therapist/       # Therapist-specific components
├── screens/             # Screen components
│   ├── auth/            # Authentication screens
│   ├── parent/          # Parent screens
│   ├── therapist/       # Therapist screens
│   └── common/          # Shared screens
├── navigation/          # Navigation configuration
│   ├── AppStack.tsx     # Main app navigation
│   ├── AuthStack.tsx    # Authentication navigation
│   ├── ParentStack.tsx  # Parent navigation
│   └── TherapistStack.tsx # Therapist navigation
├── contexts/            # React contexts
├── hooks/               # Custom React hooks
├── utils/               # Utility functions
├── lib/                 # Third-party library configurations
├── redux/               # Redux store and slices
├── graphql/             # GraphQL queries and mutations
├── languages/           # Internationalization files
├── svg/                 # SVG icons and illustrations
├── styles/              # Global styles
└── theme/               # Theme configuration

🔄 Data Flow Architecture

1. Authentication Flow

User Input → Auth Screen → API Call → Token Storage → Navigation
     ↓              ↓           ↓            ↓           ↓
  Form Data → Validation → GraphQL → MMKV → Role-based Routing

2. Real-time Data Flow

GraphQL Subscription → Apollo Cache → Component State → UI Update
         ↓                    ↓              ↓            ↓
    Socket.IO → Real-time Data → Redux Store → Re-render

3. Offline Data Flow

User Action → Local Storage → Queue → Background Sync → Server
     ↓              ↓           ↓           ↓           ↓
  Form Data → MMKV Storage → Action Queue → Network → API

🗄️ Data Management

State Management Strategy

• Redux Store: Global application state
• Apollo Cache: GraphQL data caching
• MMKV Storage: Persistent local storage
• React Context: Component-level state
• Local State: Component-specific state

Data Persistence

// MMKV Storage Structure
{
  "isLoggedin": boolean,
  "accessToken": string,
  "refreshToken": string,
  "role": "parent" | "therapist",
  "userId": string,
  "parentId": string,
  "therapistId": string,
  "languagePreference": string,
  "isOnboarded": boolean
}

GraphQL Integration

• Apollo Client: GraphQL client
• Code Generation: Type-safe GraphQL operations
• Caching Strategy: Intelligent data caching
• Offline Support: Offline-first data management
• Real-time Updates: GraphQL subscriptions

🔌 API Integration

GraphQL Endpoints

• Main API: https://api.communicaids.com/v1/graphql
• Subscriptions: wss://api.communicaids.com/v1/graphql
• File Upload: https://api.communicaids.com/api/media/upload/
• Download: https://api.communicaids.com/api/media/download/

API Client Configuration

// Apollo Client Setup
const client = new ApolloClient({
  uri: GRAPHQL_SERVER_URI,
  cache: new InMemoryCache(),
  defaultOptions: {
    watchQuery: { fetchPolicy: 'cache-and-network' },
    query: { fetchPolicy: 'cache-first' }
  }
});

Authentication

• JWT Tokens: Secure authentication
• Token Refresh: Automatic token renewal
• Role-based Access: Parent/Therapist permissions
• Session Management: Secure session handling

🔄 Real-time Communication

Socket.IO Integration

• Real-time Chat: Instant messaging
• Live Updates: Real-time data synchronization
• Connection Management: Automatic reconnection
• Message Queuing: Offline message handling

Push Notifications

• Firebase Cloud Messaging: Cross-platform notifications
• Expo Notifications: Native notification handling
• Background Processing: Background message handling
• Notification Categories: Categorized notifications

🎨 UI/UX Architecture

Design System

• Shopify Restyle: Design system framework
• Custom Theme: Brand-specific styling
• Component Library: Reusable UI components
• Responsive Design: Mobile-first approach

Theme Configuration

// Theme Structure
{
  colors: {
    primary: string,
    secondary: string,
    success: string,
    warning: string,
    error: string,
    // ... more colors
  },
  spacing: {
    xs: number,
    s: number,
    m: number,
    l: number,
    xl: number
  },
  textVariants: {
    header: TextStyle,
    body: TextStyle,
    // ... more text styles
  }
}

Component Architecture

• Atomic Design: Component hierarchy
• Props Interface: Type-safe component props
• State Management: Component state handling
• Event Handling: User interaction management

🔐 Security Architecture

Authentication Security

• JWT Tokens: Secure token-based authentication
• Token Refresh: Automatic token renewal
• Biometric Auth: Device-level security
• Session Timeout: Automatic session expiration

Data Security

• Data Encryption: Sensitive data encryption
• Secure Storage: Encrypted local storage
• API Security: HTTPS/TLS communication
• Certificate Pinning: API communication security

Privacy Protection

• Data Minimization: Collect only necessary data
• User Consent: Explicit permission requests
• Data Retention: Automatic data cleanup
• Privacy Controls: User privacy settings

📱 Platform-Specific Architecture

iOS Architecture

• Native Modules: iOS-specific functionality
• Apple Services: Sign-In, Notifications, Analytics
• iOS Permissions: Camera, microphone, notifications
• App Store: Distribution and updates

Android Architecture

• Native Modules: Android-specific functionality
• Google Services: Authentication, Analytics, Maps
• Android Permissions: Runtime permission handling
• Play Store: Distribution and updates

🚀 Performance Architecture

Optimization Strategies

• Code Splitting: Lazy loading of components
• Image Optimization: Efficient image handling
• Memory Management: Proper resource cleanup
• Bundle Optimization: Minimize app size
• Caching Strategy: Intelligent data caching

Performance Monitoring

• Crash Reporting: Automatic error tracking
• Performance Metrics: Real-time performance data
• Network Monitoring: API performance tracking
• User Analytics: Usage pattern analysis

🔄 Build & Deployment

Development Environment

• Expo CLI: Development tools
• Metro Bundler: JavaScript bundler
• Hot Reload: Fast development iteration
• Debug Tools: React Native debugger

Build Process

• EAS Build: Cloud build service
• Platform Builds: iOS and Android builds
• Code Signing: Certificate management
• App Store: Distribution preparation

Deployment Strategy

• OTA Updates: Over-the-air updates
• Version Management: Semantic versioning
• Rollback Strategy: Safe update rollback
• Feature Flags: Gradual feature rollout

🧪 Testing Architecture

Testing Strategy

• Unit Tests: Component and utility testing
• Integration Tests: API integration testing
• E2E Tests: End-to-end user flow testing
• Performance Tests: Load and stress testing

📊 Monitoring & Analytics

Error Monitoring

• Crash Reporting: Automatic crash detection
• Error Tracking: Error logging and analysis
• Performance Monitoring: Real-time performance data
• User Analytics: Usage pattern analysis

Business Metrics

• User Engagement: App usage statistics
• Feature Adoption: Feature usage tracking
• Conversion Funnels: User journey analysis
• Retention Analysis: User retention metrics

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🎯 Next Steps

• Development Setup