Deliverable-3/System-Architecture.md

@@ -6,31 +6,35 @@ https://drive.google.com/file/d/1CvoqH_p84jSwCTQ2__f6gZt2DyL88udK/view?usp=shari
 **System Architecture Discussion**  
 The Smart Grocery Management Mobile App is built on a modular, scalable architecture comprising four key layers:** Presentation (Client Devices), Application (Backend Server), Data (Database), and External Services**. This layered structure ensures a clear separation of concerns, facilitates maintainability, and provides robust support for collaborative, intelligent grocery management functionalities.  
 Presentation Layer (Client Devices – Mobile App)  
-The client side application is developed using React Native, enabling cross-platform deployment on both Android and iOS through Expo Go. Core functionalities offered to users include:
+The client side application is developed using React Native, enabling cross-platform deployment on both Android and iOS through Expo Go. Core functionalities offered to users include:  
 - Secure user login and registration
 - Grocery inventory management
 - Group based data sharing and collaboration
 - Real time reminders, expense visualization, and calorie tracking
 - AI powered recipe suggestions based on available inventory  
-The mobile app communicates with the backend over HTTPS, using JSON formatted data via RESTful API calls to ensure secure and standardized information exchange   
-Application Layer (Backend Server – Node.js/Express)  
+The mobile app communicates with the backend over HTTPS, using JSON formatted data via RESTful API calls to ensure secure and standardized information exchange     
+  
+**Application Layer (Backend Server – Node.js/Express)**   
 The backend is built with Node.js and Express, exposing a set of REST API endpoints for core functionalities:  
 - /users: Handles user registration, login, and password reset
 - /group: Manages group creation, joining, leaving, and ownership transfer
 - /items: Supports adding, updating, and deleting inventory items
-These endpoints follow RESTful principles to ensure modularity and ease of integration. Beyond routing, the backend also implements essential business logic such as:  
+These endpoints follow RESTful principles to ensure modularity and ease of integration. Beyond routing, the backend also implements essential business logic such as:   
 - Email based password verification using Nodemailer
 - Intelligent recipe requests to an external AI service
-- Calorie and BMI computations for personalized health tracking
-Data Layer (Database – MongoDB via Mongoose)  
+- Calorie and BMI computations for personalized health tracking  
+- 
+**Data Layer (Database – MongoDB via Mongoose)**  
 Persistent data storage is handled by MongoDB, with Mongoose used for schema validation and object modeling.   
 The database structure supports the following collections:  
 - Users: Stores account credentials, BMI data, and user preferences
 - Groups: Records group metadata and member associations
 - Items: Contains inventory items with attributes like expiry, price, and calorie value
 - Logs: Tracks food consumption history and financial records
-This flexible schema supports efficient querying and easy schema evolution, enabling real time group synchronization and historical data analytics.  
-External Services  
+
+This flexible schema supports efficient querying and easy schema evolution, enabling real time group synchronization and historical data analytics.   
+
+**External Services  **  
 To extend core functionality, the system integrates with two external services:  
 - Gmail SMTP (via Nodemailer): Used for sending 6 digit verification codes during password reset workflows, enhancing account security  
 - Spoonacular API: Provides personalized recipe suggestions by analyzing the user’s inventory and dietary preferences  
@@ -40,7 +44,7 @@ To extend core functionality, the system integrates with two external services:
 | ------ | ------ |
 | Secure authentication       | HTTPS, JWT tokens, and email verification via SMTP       |
 |  Group collaboration      | Shared MongoDB group model with role based access and synchronized REST API endpoints       |
-| Expiry and usage alerts     |  | Backend tracks expiry dates; frontend displays dynamic notifications   |
+| Expiry and usage alerts     | Backend tracks expiry dates; frontend displays dynamic notifications   |
 |  Expense tracking      | MongoDB logging combined with client side charting features     |
 | AI powered recipes         | Backend connects to Spoonacular API to generate intelligent suggestions     |
 |  Cross platform compatibility |     React Native ensures compatibility with both iOS and Android devices |