ingwaruz/riazanov-mebel-shop

<explanation>

1. Identify the project type and purpose

- This is a full‑stack e‑commerce web application (“Riazanov Mebel Shop”) comprising:

• A React‑based SPA client (folder client/)

• An optional Next.js client scaffold (nextjs-client/)

• A Node.js/Express REST API server (folder server/)

• A PostgreSQL database managed via Sequelize

• Nginx as a reverse‑proxy and SSL terminator

2. Top‑level architecture from the file tree

- client/ (React CRA)

• Organized by features, entities, shared modules, widgets (FSD approach)

• Uses Sass for styling, React Router, REST API calls to server

- server/ (Express + Sequelize)

• MVC‑style layers: routes → controllers → models → database

• Middleware for auth, role checks, error handling

• Migrations, backup scripts

- nextjs-client/ (SSR client stub)

- Infrastructure scripts: build-client.bat, start-server.bat, setup.ps1 (installs Nginx, Certbot)

3. How to diagram the system

a. Components

• User’s Browser

• Nginx (reverse proxy & SSL on ports 80/443)

• Frontend(s): React SPA (static files) and/or Next.js SSR

• Backend: Express REST API

• Database: PostgreSQL via Sequelize ORM

• External services: Let’s Encrypt (Certbot) for SSL, Windows Task Scheduler

b. Relationships & data flows

1. Browser → HTTPS → Nginx

2. Nginx → (static) → React build OR → (proxy) → Express API

3. Express → Sequelize queries → PostgreSQL

4. Periodic Certbot renewal via scheduled task → Nginx config reload

5. Migrations/backup jobs → Data store (shown as offline processes)

c. Architectural patterns

• Frontend: Feature‑based modular architecture (FSD)

• Backend: Layered MVC (Routes → Controllers → Services/Models)

• API‑First design: consistent REST endpoints for products, auth, orders

• Infrastructure as code: batch/PowerShell scripts for deployment, SSL

d. Key technologies

• React, React Router, Sass, Fetch/axios

• Next.js (optional SSR path)

• Node.js, Express.js

• Sequelize ORM + PostgreSQL

• Nginx, Certbot

• Windows Task Scheduler

4. Tailoring the diagram for this full‑stack project

- Visually separate “Edge” (browser), “Proxy” (Nginx), “Application” (frontend & backend), and “Data” (DB) layers

- Emphasize static asset hosting vs. API routing through Nginx

- Show sequence: build-client → deploy static to Nginx www folder; start-server → listen on 5000

- Highlight middleware chain within Express (auth → role check → error handling)

5. Diagramming guidelines

- Use clear, consistent shapes:

• Cylinders for databases

• Rectangles for services (Nginx, Express, React/Next.js)

• Cloud icon for external Let’s Encrypt

- Label every component (e.g., “Express API (5000)”, “React SPA (3000)”)

- Draw directional arrows to show request/response flows

- Apply color coding:

• Blue for frontend components

• Green for backend services

• Orange for infrastructure

• Grey for offline/cron jobs

- Group related modules: e.g., inside the React box, show sub‑modules “Features”, “Entities”, “Widgets” to convey FSD layering

6. Detail level

- Capture all critical boundaries: Browser ↔ Nginx ↔ (React / Express) ↔ DB

- Annotate special processes: migrations, backups, SSL renewal

- Avoid over‑cluttering: collapse low‑level controller/model details, but call out the MVC pattern

By following these guidelines—identifying the main layers, their interactions, and the core technologies—you will produce a precise, informative architecture diagram tailored to this project’s full‑stack e‑commerce nature.

</explanation>