🏋️‍♀️ Fitness App - Hybrid MongoDB + Firebase Architecture

🚀 Architecture Overview

This fitness app uses a hybrid architecture combining the best of both worlds:

📊 MongoDB (Primary Data Storage)

• User profiles and preferences
• Workout plans and templates
• Nutrition data and meal plans
• Exercise history and logs
• Achievement tracking

🔥 Firebase (Authentication + Real-time Features)

• User authentication (Email, Google, Apple SSO)
• Real-time step counting
• Live workout tracking
• Heart rate monitoring
• Instant notifications
• Social features (workout sharing)

---

🎯 API Endpoints

🔐 Authentication (Firebase + MongoDB)

POST /auth/register              # Register with Firebase + MongoDB
POST /auth/login                 # Traditional login
POST /auth/verify-firebase-token # Verify Firebase ID token
GET  /auth/profile               # Get user profile (Firebase protected)

📱 Real-time Fitness Tracking (Firebase)

POST /fitness-tracking/steps            # Update daily steps
GET  /fitness-tracking/steps/:date      # Get steps for date
POST /fitness-tracking/heart-rate       # Log heart rate
GET  /fitness-tracking/heart-rate/recent # Get recent heart rate data
POST /fitness-tracking/live-workout     # Update live workout progress
GET  /fitness-tracking/live-workout     # Get current live workout
POST /fitness-tracking/notifications    # Send notification
GET  /fitness-tracking/notifications    # Get unread notifications

💪 Workouts (MongoDB)

POST /workouts              # Create workout plan
GET  /workouts/user/:uid    # Get user's workouts
GET  /workouts/:id          # Get specific workout
PUT  /workouts/:id          # Update workout
DELETE /workouts/:id        # Delete workout

🥗 Nutrition (MongoDB)

POST /nutrition             # Log nutrition data
GET  /nutrition/user/:uid   # Get user's nutrition logs
PUT  /nutrition/:id         # Update nutrition log
DELETE /nutrition/:id       # Delete nutrition log

---

🚀 Quick Start

1. MongoDB: ✅ Already connected!
2. Firebase: Configure these environment variables:

   FIREBASE_PROJECT_ID=your-firebase-project-id
   FIREBASE_CLIENT_EMAIL=your-service-account-email
   FIREBASE_PRIVATE_KEY="-----BEGIN PRIVATE KEY-----\nyour-key\n-----END PRIVATE KEY-----"

3. Start server: npm run start:dev

Your fitness app now combines MongoDB's powerful querying with Firebase's real-time features! 🎯