maternal-app/docs/maternal-app-implementation-plan.md

# Implementation Plan - AI-Powered Maternal Organization App

## AI Coding Assistant Role Guide

### How to Use This Document with AI

Each phase specifies a role for the AI assistant to adopt, ensuring appropriate expertise and focus. When starting a new phase, instruct the AI with the specified role prompt to get optimal results.

**Example Usage:**

```
"For this phase, act as a Senior Backend Architect with expertise in NestJS and PostgreSQL. Focus on security, scalability, and proper architectural patterns."
```

-----

## Phase 0: Development Environment Setup (Week 0)

### 🤖 AI Role: Senior DevOps Engineer & System Architect

```
"Act as a Senior DevOps Engineer with expertise in Docker, PostgreSQL, Redis, and cloud infrastructure. Focus on creating a robust, scalable development environment with proper security configurations."
```

### Infrastructure Setup

```bash
# Required installations - See Technical Stack document for complete list
- Node.js 18+ LTS
- React Native CLI
- Expo CLI
- Docker & Docker Compose
- PostgreSQL 15+
- Redis 7+
- MongoDB 6+ (for AI chat history)
- MinIO (for file storage)
- Git
```

### Project Initialization

```bash
# Frontend setup - Reference Technical Stack document
npx create-expo-app maternal-app --template
cd maternal-app
npm install react-navigation react-native-paper redux-toolkit
# Additional packages from Technical Stack document

# Backend setup
nest new maternal-app-backend
cd maternal-app-backend
npm install @nestjs/websockets @nestjs/typeorm @nestjs/jwt
```

### Development Tools Configuration

- Set up ESLint, Prettier, Husky
- Configure VS Code with recommended extensions
- Initialize Git repositories with .gitignore
- **Configure environment variables** - See Environment Configuration Guide for complete .env setup
- Configure Docker Compose - Use docker-compose.yml from Environment Configuration Guide

### AI Service Setup

- **Configure AI services** - See Environment Configuration Guide for API keys
- **LangChain setup** - See AI Context & Prompting Templates document
- Rate limiting configuration (100 requests/minute per user)

-----

## Phase 1: Foundation & Authentication (Week 1-2)

### 🤖 AI Role: Senior Backend Developer & Security Expert

```
"Act as a Senior Backend Developer specializing in NestJS, PostgreSQL, and JWT authentication. Focus on security best practices, OWASP compliance, and building a scalable authentication system with device fingerprinting."
```

### 1.1 Database Schema Design

```sql
-- Use complete schema from Database Migration Scripts document
-- Run migrations V001 through V007 in sequence
-- See Database Migration Scripts for rollback procedures
```

### 1.2 Authentication System

```typescript
// Backend: NestJS Auth Module
// Complete implementation in API Specification Document - Authentication Endpoints section

@Module({
  imports: [
    JwtModule.register({
      secret: process.env.JWT_SECRET,
      signOptions: { expiresIn: '1h' }, // Access token
      // Refresh token handled separately - see API Specification
    }),
    PassportModule,
  ],
  providers: [AuthService, JwtStrategy, LocalStrategy],
  controllers: [AuthController],
})
export class AuthModule {}

// Implement endpoints from API Specification Document:
POST /api/v1/auth/register (with device fingerprinting)
POST /api/v1/auth/login
POST /api/v1/auth/refresh
POST /api/v1/auth/logout
```

### 1.3 Mobile Authentication UI

```typescript
// React Native Screens - Follow UI/UX Design System document
// Use Material Design components and warm color palette
- SplashScreen.tsx
- OnboardingScreen.tsx
- LoginScreen.tsx (implement design from UI/UX Design System)
- RegisterScreen.tsx
- ForgotPasswordScreen.tsx

// Key components with Material Design
- BiometricLogin component
- SocialLoginButtons (Google/Apple)
- SecureTextInput component (min-height: 48px for touch targets)
```

### 1.4 Internationalization Setup

```javascript
// i18n configuration - 5 languages from MVP Features document
// See Error Handling & Logging Standards for localized error messages
import i18n from 'i18next';
import { initReactI18next } from 'react-i18next';

// Language files structure
/locales
  /en-US
  /es-ES
  /fr-FR
  /pt-BR
  /zh-CN
```

### Deliverables Week 1-2

- [ ] Working authentication flow with JWT + Refresh tokens
- [ ] Device fingerprinting (see API Specification)
- [ ] Secure password storage with bcrypt
- [ ] Email verification system
- [ ] Multi-language support (5 languages)
- [ ] Material Design UI components

-----

## Phase 2: Child Profiles & Family Management (Week 2-3)

### 🤖 AI Role: Full-Stack Developer with Real-time Systems Experience

```
"Act as a Full-Stack Developer with expertise in React Native, NestJS, WebSockets, and Redis. Focus on building real-time synchronization, family data management, and responsive mobile UI with Material Design."
```

### 2.1 Child Profile CRUD Operations

```typescript
// API Endpoints - Full specifications in API Specification Document
// See "Children Management Endpoints" section for complete schemas

POST /api/v1/children
GET /api/v1/children/:id
PUT /api/v1/children/:id
DELETE /api/v1/children/:id

// Use State Management Schema for Redux structure
// Children slice with normalized state shape
```

### 2.2 Family Invitation System

```typescript
// Complete flow in API Specification Document - "Family Management Endpoints"
POST /api/v1/families/invite
POST /api/v1/families/join/:shareCode

// Error handling from Error Handling & Logging Standards
// Use error codes: LIMIT_FAMILY_SIZE_EXCEEDED, AUTH_DEVICE_NOT_TRUSTED
```

### 2.3 Real-time Family Sync Setup

```typescript
// WebSocket implementation - See API Specification Document "WebSocket Events"
// State sync via State Management Schema - Sync Slice

@WebSocketGateway()
export class FamilyGateway {
  // Implementation details in API Specification
  // Use sync middleware from State Management Schema
}
```

### 2.4 Mobile Family Management UI

```typescript
// Screens following UI/UX Design System
// Material Design with warm color palette (peach, coral, rose)
// Minimum touch targets: 44x44px

- FamilyDashboard.tsx (use card components from Design System)
- AddChildScreen.tsx (spacious layout for one-handed use)
- ChildProfileScreen.tsx
- InviteFamilyMember.tsx
- FamilySettings.tsx
```

-----

## Phase 3: Core Tracking Features (Week 3-4)

### 🤖 AI Role: Mobile Developer & Offline-First Systems Expert

```
"Act as a Senior Mobile Developer specializing in React Native, offline-first architecture, and voice interfaces. Focus on building intuitive tracking features with voice input, offline support, and seamless sync using Redux and SQLite."
```

### 3.1 Database Schema for Activities

```sql
-- Use Migration V003 from Database Migration Scripts document
-- Includes partitioned tables for scalability
-- Run performance optimization indexes from Migration V005
```

### 3.2 Activity Tracking Services

```typescript
// Backend services - See API Specification "Activity Tracking Endpoints"
// Implement all REST endpoints with proper error codes

@Injectable()
export class TrackingService {
  // Use error codes from Error Handling & Logging Standards
  // Implement offline queue from State Management Schema
  
  async logFeeding(data: FeedingDto) {
    // Follow API schema from specification
    // Emit WebSocket events per API Specification
    // Update Redux state per State Management Schema
  }
}
```

### 3.3 Voice Input Integration

```typescript
// Complete implementation in Voice Input Processing Guide
// Multi-language patterns for all 5 MVP languages
// Whisper API configuration from Environment Configuration Guide

import { WhisperService } from './services/whisperService';
// Use natural language patterns from Voice Input Processing Guide
// Implement error recovery and clarification prompts
```

### 3.4 Tracking UI Components

```typescript
// Follow UI/UX Design System specifications
// Material Design components with warm palette
// One-handed operation optimization (bottom 60% of screen)

- QuickActionButtons.tsx (FAB positioning from Design System)
- FeedingTimer.tsx
- SleepTracker.tsx
- DiaperLogger.tsx
- ActivityTimeline.tsx (use skeleton screens for loading)
```

### 3.5 Offline Support Implementation

```typescript
// Complete offline architecture in State Management Schema
// See Offline Slice and middleware configuration
// Sync queue implementation from Sync Slice
```

-----

## Phase 4: AI Assistant Integration (Week 4-5)

### 🤖 AI Role: AI/ML Engineer & LLM Integration Specialist

```
"Act as an AI/ML Engineer with expertise in LangChain, OpenAI APIs, prompt engineering, and safety systems. Focus on building a helpful, safe, and contextually aware AI assistant with proper token management and response quality."
```

### Context Review:

```
"Also review as a Child Safety Expert to ensure all AI responses are appropriate for parenting contexts and include proper medical disclaimers."
```

### 4.1 LLM Service Setup

```typescript
// Complete LangChain configuration in AI Context & Prompting Templates document
// Use system prompts and safety boundaries from the document

import { initializeLangChain } from './config/langchain';
// See AI Context & Prompting Templates for:
// - Context window management (4000 tokens)
// - Safety boundaries and medical disclaimers
// - Personalization engine
```

### 4.2 Context Management System

```typescript
// Full implementation in AI Context & Prompting Templates
// Priority weighting system for context selection

class AIContextBuilder {
  // Use ContextManager from AI Context & Prompting Templates
  // Implements token counting and prioritization
  // Child-specific context templates
}
```

### 4.3 Chat Interface Implementation

```typescript
// React Native Chat UI
// Follow UI/UX Design System for chat bubbles
// Implement localized responses from AI Context & Prompting Templates

const AIAssistantScreen = () => {
  // Use conversation memory management from AI Context document
  // Implement prompt injection protection
  // Apply response formatting templates
};
```

### 4.4 Smart Notifications System

```typescript
// Use patterns from API Specification - Analytics & Insights Endpoints
// Schedule based on predictions from AI

class SmartNotificationService {
  // Reference notification preferences from Database Migration V006
  // Use push notification setup from Environment Configuration Guide
}
```

-----

## Phase 5: Pattern Recognition & Analytics (Week 5-6)

### 🤖 AI Role: Data Scientist & Analytics Engineer

```
"Act as a Data Scientist with expertise in time-series analysis, pattern recognition, and data visualization. Focus on building accurate prediction algorithms, meaningful insights extraction, and clear data presentation using React Native charts."
```

### Context Review:

```
"Review predictions as a Pediatric Data Analyst to ensure all insights are age-appropriate and medically sound."
```

### 5.1 Pattern Analysis Engine

```typescript
// Pattern detection algorithms referenced in API Specification
// See "Analytics & Insights Endpoints" for complete schemas

@Injectable()
export class PatternAnalysisService {
  // GraphQL queries from API Specification for complex data
  // Use AI Context & Prompting Templates for pattern insights
  
  async analyzeSleepPatterns(childId: string) {
    // Implement sleep prediction from Voice Input Processing Guide
    // Store predictions in State Management Schema - AI Slice
  }
}
```

### 5.2 Predictive Algorithms

```typescript
// Sleep prediction using patterns from API Specification
// Response format from "GET /api/v1/insights/{childId}/predictions"

class SleepPredictor {
  // Algorithm matches Huckleberry's SweetSpot® approach
  // 85% confidence target from API Specification
}
```

### 5.3 Analytics Dashboard

```typescript
// Dashboard Components using UI/UX Design System
// Material Design cards and charts
// Victory Native from Technical Stack document

- WeeklySleepChart.tsx (use warm color palette)
- FeedingFrequencyGraph.tsx
- GrowthCurve.tsx (WHO percentiles)
- PatternInsights.tsx
- ExportReport.tsx
```

### 5.4 Report Generation

```typescript
// PDF generation using libraries from Technical Stack
// GraphQL WeeklyReport query from API Specification

class ReportGenerator {
  // Use report formatting from UI/UX Design System
  // Include localized content for all 5 languages
}
```

-----

## Phase 6: Testing & Optimization (Week 6-7)

### 🤖 AI Role: QA Engineer & Performance Specialist

```
"Act as a Senior QA Engineer with expertise in Jest, Detox, performance testing, and accessibility compliance. Focus on comprehensive test coverage, performance optimization, and ensuring WCAG compliance."
```

### Context Reviews:

```
1. "Review as a Security Auditor for vulnerability assessment"
2. "Review as an Accessibility Expert for WCAG AA/AAA compliance"
3. "Review as a Performance Engineer for optimization opportunities"
```

### 6.1 Unit Testing Implementation

```typescript
// Complete testing strategy in Testing Strategy Document
// 80% code coverage requirement
// Use mock data structures from Testing Strategy Document

describe('TrackingService', () => {
  // Test examples from Testing Strategy Document
  // Use error codes from Error Handling & Logging Standards
});

describe('SleepPredictor', () => {
  // Performance benchmarks from Testing Strategy Document
  // 85% accuracy target for predictions
});
```

### 6.2 Integration Testing

```typescript
// E2E tests with Detox - See Testing Strategy Document
// Critical user journeys and offline sync testing

describe('Complete tracking flow', () => {
  // Test WebSocket sync from API Specification
  // Verify offline queue from State Management Schema
});
```

### 6.3 Performance Optimization

```typescript
// React Native optimizations from UI/UX Design System
// - 60fps scrolling requirement
// - 2-second max load time
// - Skeleton screens for loading states

// Backend optimizations from Database Migration Scripts
// - Partitioned tables for activities
// - Performance indexes from Migration V005
// - Redis caching from Environment Configuration
```

### 6.4 Security Audit

```bash
# Security checklist from multiple documents:
# - API Specification: Request signing, rate limiting
# - Environment Configuration: Secret rotation schedule  
# - Database Migrations: COPPA/GDPR compliance tables
# - Error Handling: Audit logging implementation
```

-----

## Phase 7: Beta Testing & Launch Preparation (Week 7-8)

### 🤖 AI Role: DevOps Engineer & Mobile Deployment Specialist

```
"Act as a DevOps Engineer with expertise in CI/CD, mobile app deployment, TestFlight, Google Play Console, and production infrastructure. Focus on automated deployment pipelines, monitoring setup, and app store compliance."
```

### Context Review:

```
"Review as a Compliance Officer for COPPA/GDPR requirements and app store policies"
```

### 7.1 Beta Testing Program

```markdown
# Beta Testing Plan from Testing Strategy Document
- Recruit 50 diverse families (language/geography diversity)
- Testing groups from Mobile Build & Deployment Guide
- Use TestFlight/Play Console setup from Mobile Build & Deployment Guide
- Feedback collection via Testing Strategy Document metrics
```

### 7.2 App Store Preparation

```markdown
# Complete requirements from Mobile Build & Deployment Guide
# iOS App Store - see "TestFlight Configuration" section
# Google Play Store - see "Google Play Console Configuration" section

# Store assets using UI/UX Design System guidelines:
- Screenshots with warm color palette
- App icon with peach/coral branding
- Localized descriptions for 5 languages
```

### 7.3 Monitoring Setup

```typescript
// Sentry configuration from Environment Configuration Guide
// Error tracking setup from Error Handling & Logging Standards

import * as Sentry from '@sentry/react-native';
// Use Sentry DSN from Environment Configuration
// Implement error filtering from Error Handling document

// Analytics from Technical Stack document (PostHog/Matomo)
```

### 7.4 Production Infrastructure

```yaml
# Use docker-compose.yml from Environment Configuration Guide
# Add production settings from Mobile Build & Deployment Guide
# Include all services from Technical Stack:
# - PostgreSQL, MongoDB, Redis, MinIO
```

-----

## Phase 8: Launch & Post-Launch (Week 8+)

### 🤖 AI Role: Product Manager & Growth Engineer

```
"Act as a Product Manager with expertise in user analytics, growth strategies, and iterative development. Focus on monitoring key metrics, user feedback analysis, and rapid iteration based on real-world usage."
```

### Context Reviews:

```
1. "Analyze as a Data Analyst for user behavior patterns"
2. "Review as a Customer Success Manager for support improvements"
3. "Evaluate as a Growth Hacker for retention optimization"
```

### 8.1 Launch Checklist

```markdown
## Technical - Reference Mobile Build & Deployment Guide
- [ ] Production environment live (Environment Configuration Guide)
- [ ] SSL certificates configured
- [ ] CDN configured (Technical Stack - performance section)
- [ ] Backup systems tested (Database Migration Scripts - maintenance)
- [ ] Monitoring dashboards active (Error Handling & Logging Standards)
- [ ] Error tracking enabled (Sentry setup)
- [ ] Analytics tracking verified (PostHog/Matomo)

## Legal
- [ ] Privacy policy published (COPPA/GDPR from Database Migrations)
- [ ] Terms of service published
- [ ] Compliance verified (Audit tables from Migration V007)

## Support
- [ ] Help documentation complete
- [ ] Multi-language support ready (5 languages)
- [ ] Error messages localized (Error Handling document)
```

### 8.2 Post-Launch Monitoring

```typescript
// Key metrics from Testing Strategy Document
// Success criteria: 60% DAU, <2% crash rate, 4.0+ rating

const metrics = {
  // Track via analytics setup from Environment Configuration
  // Use error monitoring from Error Handling & Logging Standards
  // Performance metrics from API Specification (p95 < 3s)
};
```

### 8.3 Rapid Iteration Plan

```markdown
# Use CodePush from Mobile Build & Deployment Guide for OTA updates
# Follow staged rollout strategy from Mobile Build & Deployment Guide

# Week 1-2: Monitor error codes from Error Handling document
# Week 3-4: UI improvements based on Design System principles
# Month 2: Premium features from MVP Features document
```

-----

## Development Best Practices

### Code Organization

```
/maternal-app
  /src
    /components
      /common
      /tracking
      /ai
    /screens
    /services
    /hooks
    /utils
    /redux
      /slices
      /actions
    /locales
    /navigation
    /types

/maternal-app-backend
  /src
    /modules
      /auth
      /users
      /families
      /tracking
      /ai
    /common
      /guards
      /interceptors
      /filters
    /database
      /entities
      /migrations
```

### Git Workflow

```bash
# Branch naming
feature/track-feeding
bugfix/sync-issue
hotfix/crash-on-login

# Commit messages
feat: add voice input for feeding tracker
fix: resolve timezone sync issue
docs: update API documentation
test: add unit tests for sleep predictor
```

### CI/CD Pipeline

```yaml
# GitHub Actions example
name: CI/CD Pipeline
on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: npm install
      - run: npm test
      - run: npm run lint
      
  build:
    needs: test
    runs-on: ubuntu-latest
    steps:
      - run: npm run build
      - run: docker build
      
  deploy:
    needs: build
    if: github.ref == 'refs/heads/main'
    steps:
      - run: ./deploy.sh
```

-----

## Risk Mitigation Strategies

### Technical Risks

1. **LLM API Downtime**
- Implement fallback to cached responses
- Queue queries for retry
- Basic rule-based responses as backup
1. **Scalability Issues**
- Start with vertical scaling capability
- Design for horizontal scaling from day 1
- Implement caching aggressively
1. **Data Loss**
- Automated backups every 6 hours
- Point-in-time recovery capability
- Multi-region backup storage

### Business Risks

1. **Low User Adoption**
- Quick onboarding (< 2 minutes)
- Immediate value demonstration
- Strong referral incentives
1. **High Churn Rate**
- Weekly engagement emails
- Push notification optimization
- Feature discovery prompts
1. **Competitive Pressure**
- Rapid feature iteration
- Strong AI differentiation
- Community building

-----

## Success Criteria

### MVP Launch Success

- 1,000 downloads in first month
- 60% day-7 retention
- 4.0+ app store rating
- <2% crash rate
- 5+ activities logged per day per active user
- 70% of users trying AI assistant

### 3-Month Goals

- 10,000 active users
- 500 premium subscribers
- 50% month-over-month growth
- 4.5+ app store rating
- 3 major feature updates
- 2 partnership agreements

### 6-Month Vision

- 50,000 active users
- 2,500 premium subscribers
- Break-even on operational costs
- International expansion (10+ countries)
- Integration ecosystem launched
- Series A fundraising ready