PCForge — Computer Shop & Custom PC Builder Platform

A full-stack, cross-platform e-commerce and custom PC building ecosystem modeled on the enthusiast computer retail industry. Customers design custom rigs with real-time hardware compatibility validation, autonomous LangGraph AI agents recommend specifications and reserve inventory, store technicians review builds in dedicated assembly workbenches, and after-sales service workflows provide seamless RMA and appointment scheduling.

🌐 Live Deployments & Application Links

Application / Tier	Platform / Technology	Direct Access URL
🌐 React Web Admin Portal	Cloudflare Pages (React 19 + Vite)	`https://pc-forge-admin.pages.dev`
⚡ ASP.NET Core Web API	Render (.NET 8, EF Core, PostgreSQL)	`https://pc-forge.onrender.com`
📑 Interactive API Docs (Swagger)	Swashbuckle OpenAPI	`https://pc-forge.onrender.com/swagger`
🤖 Python AI Microservice	Render (FastAPI + LangGraph + Gemini)	`https://pc-forge-ai-service.onrender.com`
📘 AI Interactive API Docs	FastAPI Swagger UI	`https://pc-forge-ai-service.onrender.com/docs`
📱 Mobile App (Android APK)	Flutter 3.x (Material 3)	⬇️ Download Latest APK (GitHub Releases)
🗄️ Relational Database	Neon Serverless PostgreSQL	Managed Cloud Database (15 normalized tables)
🩺 Backend Health Endpoint	ASP.NET Core Health Checks	`https://pc-forge.onrender.com/health`

⚠️ Render Free-Tier Notice: Render automatically spins down idle containers after 15 minutes of inactivity. When visiting the Backend API or AI Service for the first time, allow ~30–45 seconds for instances to complete cold start.

Platform Highlights & Core Capabilities

Interactive Custom PC Builder: Live wattage summation, CPU-motherboard socket matching (AM5, AM4, LGA1700), RAM DDR generation verification, form factor clearance checks, and one-tap checkout with automatic component reservation.
Autonomous Multi-Agent AI (LangGraph): 5 specialized agents orchestrating customer requirement extraction, live stock lookups with alternative substitutions, deterministic hardware clearance, pricing proposals in LKR, and after-sales service appointment scheduling.
Multi-Key LLM Cascading Failover: Enterprise key rotation mechanism supporting up to 6 Gemini API keys with automatic exponential backoff, health tracking, and zero downtime during quota exhaustion.
Store Operations & Staff Workbenches: Dedicated React web portal for store managers and technicians, featuring real-time KPI metrics, custom build review queues with automated compatibility meters, inventory adjusters, order fulfillment tabs, and service request intake.
Reactive Mobile Client (Flutter): Material 3 mobile application featuring reactive state management (Provider + ChangeNotifier), faceted catalog search, hardware camera scanner, and customer appointment management.
Zero-Hallucination Database Isolation: AI microservice operates statelessly; all database persistence and stock updates are authoritatively validated and committed exclusively through the ASP.NET Core backend.

Autonomous AI Agent Ecosystem (LangGraph)

The platform integrates 5 specialized LangGraph AI agents, each designed for a specific stage of the custom PC purchasing and support journey:

┌────────────────────────────────────────────────────────────────────────────────────────┐
│                              PCFORGE MULTI-AGENT ARCHITECTURE                          │
├────────────────────────┬──────────────────────────────────┬────────────────────────────┤
│ Agent Name             │ Primary Domain / Responsibility  │ Key Tools & Safeguards     │
├────────────────────────┼──────────────────────────────────┼────────────────────────────┤
│ 🤖 Requirement Agent   │ Conversational Budget & Use-case │ RAG profile, no part leak  │
│ 🤖 Inventory Agent     │ Stock Verification & Holds       │ Live stock check, 15m hold │
│ 🤖 PC Build Agent      │ Compatibility & Tolerance Rules  │ Socket, DDR, PSU +150W     │
│ 🤖 Order Planning Agent│ LKR Pricing, Bundles & Coupons   │ Promo codes, delivery fee  │
│ 🤖 After-Sales Agent   │ Troubleshooting & RMA Scheduling │ Date capacity, RMA ticket  │
└────────────────────────┴──────────────────────────────────┴────────────────────────────┘

1. 🤖 Requirement Discovery Agent

Domain: Multi-turn customer onboarding (ai_service/agents/requirement_agent/).
Functionality: Extracts customer use-case (1440p gaming, 3D rendering, machine learning), budget constraints in LKR, and performance priorities without prematurely hallucinating component models.

2. 🤖 Inventory Stock Agent

Domain: Shelf availability and reservation (ai_service/agents/inventory_agent/).
Functionality: Queries live component inventory, recommends pin-compatible alternatives when parts are out of stock, and establishes temporary 15-minute reservation holds to prevent inventory race conditions.

3. 🤖 PC Build & Compatibility Agent

Domain: Deterministic hardware compatibility validation (ai_service/agents/build_agent/).
Functionality: Enforces strict hardware constraints:
- CPU & Motherboard socket pairing (AM5, LGA1700, AM4).
- Memory generation compatibility (DDR4 vs DDR5 DIMM).
- Power supply headroom validation (System Total TDP $+ 150\text{W}$ minimum transient buffer).
- Case clearance and motherboard form-factor compatibility (E-ATX, ATX, Micro-ATX, Mini-ITX).

4. 🤖 Order Planning & Pricing Agent

Domain: Checkout planning and promotions (ai_service/agents/order_planning_agent/).
Functionality: Calculates itemized bills in Sri Lankan Rupees (LKR), validates coupon codes with minimum order constraints, computes island-wide delivery tiers, and generates draft order proposals.

5. 🤖 After-Sales Service Agent

Domain: Troubleshooting and service intake (ai_service/agents/after_sales_agent/).
Functionality: Guides customers through safe hardware troubleshooting trees (power cables, PSU switches, display outputs), checks warranty periods based on purchase dates, and schedules in-store technician appointments (enforcing a daily maximum capacity of 10 appointments).

System Architecture

┌────────────────────────────────────────────────┐     ┌────────────────────────────────────────────────┐
│             React Web Admin Portal             │     │               Flutter Mobile App               │
│            (Store Staff & Technicians)         │     │               (Customer Client)                │
└───────────────────────┬────────────────────────┘     └───────────────────────┬────────────────────────┘
                        │  HTTPS / JWT Bearer Tokens                           │  HTTPS / JWT Bearer Tokens
                        ▼                                                      ▼
┌───────────────────────────────────────────────────────────────────────────────────────────────────────┐
│                                     ASP.NET Core 8 Web API (:5000)                                    │
│             Controllers  ──►  Services Layer  ──►  Entity Framework Core  ──►  PostgreSQL             │
│             AiAgentService.cs  ──►  Internal HTTP Gateway Bridge (:5050)                             │
└───────────────────────────────────────────────────┬───────────────────────────────────────────────────┘
                                                    │ Internal HTTP JSON RPC
                                                    ▼
                             ┌─────────────────────────────────────────────┐
                             │       Python AI Microservice (:5050)        │
                             │       FastAPI + LangGraph StateGraph        │
                             │   Google Gemini with Multi-Key Failover     │
                             │      5 Domain-Specific Tool Toolkits        │
                             └─────────────────────────────────────────────┘

Architectural Principles

Single Entry Gateway: React and Flutter clients communicate exclusively with the ASP.NET Core Web API.
Stateless AI Boundary: The Python AI microservice is an internal service invoked exclusively by AiAgentService.cs and is never exposed directly to external networks.
Database Consistency: All write operations against PostgreSQL are transactional and managed by Entity Framework Core with row-level locking during inventory reservations.

For full architectural decision records, see docs/ADR.md.

Default Demo Credentials

Role	Email Address	Password	Intended Client Interface
Admin	`admin@pcforge.com`	`Admin123!`	React Web Portal (`/staff`, full administrative control)
Staff / Technician	`staff@pcforge.com`	`Staff123!`	React Web Portal (Orders, Inventory, Build Reviews, Support)
Customer	`customer@pcforge.com`	`Cust123!`	Flutter Mobile Application

Role Hierarchy: Admin $\supset$ Staff $\supset$ Customer.

🇱🇰 Currency Standard: All pricing, subtotals, build estimates, and receipts strictly operate in Sri Lankan Rupees (LKR).

Technology Stack

Layer	Technologies & Frameworks
Backend API	ASP.NET Core (.NET 8), Entity Framework Core 8, Npgsql, Swashbuckle OpenAPI, BCrypt.Net
Database	Neon Serverless PostgreSQL, 15 normalized relational tables, SQL indexes, foreign key cascades
AI Microservice	Python 3.11, FastAPI, LangGraph, LangChain, Google Generative AI (Gemini 2.5 / 3.8 Flash), Uvicorn
Web Portal	React 19, Vite, React Router 7, Axios, Lucide Icons, Vanilla CSS Design System
Mobile App	Flutter 3.x, Dart 3.10+, Provider & ChangeNotifier, Material 3 Design System, Mobile Scanner
DevOps & CI/CD	GitHub Actions (Ubuntu multi-job pipeline), Python Runner Orchestrator, Cloudflare Pages, Render

Database Schema & Entities

The platform uses 15 normalized relational tables managed via PostgreSQL:

Roles ──────< Users ──────< Staff
                │
                ├───< Orders ─────< OrderItems ─────> Products
                ├───< Carts  ─────< CartItems  ─────> Products
                ├───< ServiceRequests
                └───< CustomBuilds ───< CustomBuildItems ───> Products

Categories ───< CategoryFilters ───< FilterOptions
           ───< Products ────────< ProductFilterValues ───> FilterOptions

Authentication & Staff: Roles, Users, Staff
Catalog & Faceted Search: Categories, Products, CategoryFilters, FilterOptions, ProductFilterValues
Cart & Orders: Carts, CartItems, Orders, OrderItems, Coupons
Custom Rig Configuration: CustomBuilds, CustomBuildItems
After-Sales Services: ServiceRequests

Database Schema: db/schema.sql · Seed Data: db/seed.sql

Project Structure

pc-forge/
├── runner.py                  # Full-stack orchestrator for all 4 application tiers
├── .github/workflows/ci.yml   # Multi-job GitHub Actions CI/CD pipeline
├── docs/                      # Architecture Decision Records (ADRs) & documentation
│   ├── ADR.md                 # 6 Architectural Decision Records
│   └── performance/           # Locust load and stress testing scripts
├── db/                        # Database scripts
│   ├── schema.sql             # Relational DDL schema with indexes and constraints
│   ├── seed.sql               # Enthusiast component catalog, demo users, orders
│   └── cleanup_and_migration.sql # Migration and cleanup scripts
├── backend/                   # ASP.NET Core Web API (.NET 8)
│   ├── Controllers/           # Auth, Products, Categories, Orders, CustomBuilds, ServiceRequests, Staff
│   ├── Services/              # AiAgentService, AuthService, CloudinaryImageUploadService
│   ├── Data/                  # AppDbContext, DbInitializer
│   ├── Models/                # Entity Framework Core domain entities
│   └── DTOs/                  # Data transfer object contracts
├── backend.Tests/             # xUnit integration & unit test suite (.NET 8/9)
├── ai_service/                # Python FastAPI Agentic AI Microservice (:5050)
│   ├── agents/                # 5 LangGraph autonomous agent implementations
│   ├── test_gemini_keys.py    # Diagnostic tool for inspecting Gemini API keys
│   └── tests/                 # Pytest test suite for agent tools & workflows
├── app/                       # Flutter 3.x Customer Mobile Application
│   ├── lib/core/              # Routing, themes, auth session, common widgets
│   ├── lib/features/          # auth, catalog, cart, checkout, orders, support, build_pc, scanner
│   └── test/                  # Flutter unit & widget test suite
└── web/                       # React 19 + Vite Staff & Admin Portal
    ├── src/pages/             # Staff, BuildReviews, Orders, ServiceRequests, Products, Categories
    ├── src/components/        # Modular workbenches, inspection modals, tables
    ├── src/services/          # API client services
    └── src/__tests__/         # Vitest unit test suite

Quick-Start Guide

⚡ One-Command Runner (Recommended)

Run all 4 application tiers simultaneously using the built-in orchestrator:

python runner.py

The orchestrator initializes:

Backend API: http://localhost:5000
AI Microservice: http://localhost:5050
Web Admin Portal: http://localhost:5173
Mobile Client: Connected Android device, emulator, or Windows desktop target

Orchestrator Hotkeys:

b — Restart Backend
w — Restart Web Portal
m — Restart Mobile Client
s — Display service status overview
q — Cleanly terminate all background services

Step-by-Step Manual Setup

1. Environment Configuration

Copy .env.example to .env in the project root:

# Google Gemini API Keys (Multi-key cascading fallback 1 -> 6)
GEMINI_API_KEY_1=your_gemini_api_key_1
GEMINI_API_KEY_2=your_gemini_api_key_2
CHAT_MODEL=gemini-3.8-flash

# Database Connection (PostgreSQL)
DATABASE_URL=postgresql://user:password@host/pcforge_db

# Security & JWT Authentication
JWT_SECRET=your_super_secret_jwt_key_at_least_32_characters_long

# Cloud Storage (Optional for RMA image uploads)
CLOUDINARY_URL=cloudinary://api_key:api_secret@cloud_name

2. Database Setup

# Apply schema and initial seed data
python update-db.py --seed

# Verify table integrity
python update-db.py --status

3. ASP.NET Core Web API (.NET 8)

cd backend
dotnet restore
dotnet run
# Swagger UI available at: http://localhost:5000/swagger

4. Python AI Microservice

cd ai_service
pip install -r requirements.txt
uvicorn main:app --host 0.0.0.0 --port 5050 --reload
# Interactive API docs available at: http://localhost:5050/docs

5. React Web Admin Portal

cd web
npm install
npm run dev
# Portal accessible at: http://localhost:5173

6. Flutter Customer Mobile App

cd app
flutter pub get
flutter run

For physical Android devices over USB:

adb reverse tcp:5000 tcp:5000
adb reverse tcp:5050 tcp:5050
flutter run

📱 Mobile App Download & Installation (Android APK)

The compiled PCForge customer mobile client is available for instant download:

Installation Options:

Direct Download from GitHub Releases (Recommended):
- Download the latest app-release.apk directly to your Android device.
- Tap the downloaded file and select Install (allow "Install unknown apps" if prompted by your browser or file manager).

Install via ADB (Connected Device):

adb install app/build/app/outputs/flutter-apk/app-release.apk

Build APK from Source:

cd app
flutter pub get
flutter build apk --release
# Output artifact: app/build/app/outputs/flutter-apk/app-release.apk

Automated Test Suites

The repository features comprehensive automated test coverage across all subsystems:

# 1. Backend Integration Tests (.NET xUnit)
cd backend.Tests
dotnet test --configuration Release

# 2. React Web Portal Tests (Vitest)
cd web
npm test

# 3. Flutter Mobile Unit & Widget Tests
cd app
flutter test

# 4. Python AI Agent Evaluation Tests (Pytest)
cd ai_service
pytest tests/ -v --tb=short

Subsystem	Framework	Focus Areas
Backend API	xUnit, InMemory EF Core, WebApplicationFactory	Role-based authorization, JWT validation, custom build approval transitions, service requests
React Web	Vitest, jsdom, React Testing Library	Authenticated routing, workbench tables, modals, API client service integration
Flutter Mobile	Flutter Test, Widget Tester	Cart state reactivity, custom PC builder rules, catalog search, barcode scanner integration
Agentic AI	Pytest, LangGraph Test Harness	Component clearance logic, prompt injection resistance, tool schema execution, multi-key rotation

Performance & Load Testing (Locust)

pip install locust
locust -f docs/performance/locustfile.py --host=http://localhost:5000

Evaluates throughput, database connection pool resilience, and response latencies under concurrent user loads.

CI/CD Pipeline

The GitHub Actions workflow (.github/workflows/ci.yml) automatically runs on push and pull request events targeting main and dev:

Security & Integrity Gate: Scans git tree to prevent secret leaks (.env or credential tracking).
Backend Job: .NET 8 SDK setup $\rightarrow$ dependency restore $\rightarrow$ Release build $\rightarrow$ xUnit test execution $\rightarrow$ vulnerability scan.
AI Service Job: Python 3.11 $\rightarrow$ dependencies $\rightarrow$ bytecode compilation $\rightarrow$ Pytest suite.
React Web Job: Node 22 $\rightarrow$ clean install (npm ci) $\rightarrow$ static analysis (oxlint) $\rightarrow$ Vitest test suite $\rightarrow$ production bundle build.
Flutter Mobile Job: Flutter 3.38.5 $\rightarrow$ package resolution $\rightarrow$ static code analysis (flutter analyze --no-fatal-infos) $\rightarrow$ widget tests.

Security & Architectural Governance

Zero-Trust Role Permissions: Strict JWT claim verification with zero clock-skew tolerance to prevent token replay attacks.
Secure Password Hashing: BCrypt hashing with work factor 12 for all stored credentials.
Deterministic AI Guardrails: Tool-calling schemas restrict AI agents to verified, allow-listed internal endpoints. Unsafe operations require human-in-the-loop review.
Sanitized Logs: Diagnostic and logging utilities automatically redact sensitive API keys and secrets from output streams.

License

This project is licensed under the MIT License — see the LICENSE file for details.

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PCForge — Computer Shop & Custom PC Builder Platform

🌐 Live Deployments & Application Links

Platform Highlights & Core Capabilities

Autonomous AI Agent Ecosystem (LangGraph)

1. 🤖 Requirement Discovery Agent

2. 🤖 Inventory Stock Agent

3. 🤖 PC Build & Compatibility Agent

4. 🤖 Order Planning & Pricing Agent

5. 🤖 After-Sales Service Agent

System Architecture

Architectural Principles

Default Demo Credentials

Technology Stack

Database Schema & Entities

Project Structure

Quick-Start Guide

⚡ One-Command Runner (Recommended)

Step-by-Step Manual Setup

1. Environment Configuration

2. Database Setup

3. ASP.NET Core Web API (.NET 8)

4. Python AI Microservice

5. React Web Admin Portal

6. Flutter Customer Mobile App

📱 Mobile App Download & Installation (Android APK)

Installation Options:

Automated Test Suites

Performance & Load Testing (Locust)

CI/CD Pipeline

Security & Architectural Governance

License

About

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Name		Name	Last commit message	Last commit date
.github		.github
ai_service		ai_service
app		app
backend.Tests		backend.Tests
backend		backend
db		db
docs		docs
web		web
.env.example		.env.example
.gitignore		.gitignore
README.md		README.md
global.json		global.json
logo.png		logo.png
runner.py		runner.py

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PCForge — Computer Shop & Custom PC Builder Platform

🌐 Live Deployments & Application Links

Platform Highlights & Core Capabilities

Autonomous AI Agent Ecosystem (LangGraph)

1. 🤖 Requirement Discovery Agent

2. 🤖 Inventory Stock Agent

3. 🤖 PC Build & Compatibility Agent

4. 🤖 Order Planning & Pricing Agent

5. 🤖 After-Sales Service Agent

System Architecture

Architectural Principles

Default Demo Credentials

Technology Stack

Database Schema & Entities

Project Structure

Quick-Start Guide

⚡ One-Command Runner (Recommended)

Step-by-Step Manual Setup

1. Environment Configuration

2. Database Setup

3. ASP.NET Core Web API (.NET 8)

4. Python AI Microservice

5. React Web Admin Portal

6. Flutter Customer Mobile App

📱 Mobile App Download & Installation (Android APK)

Installation Options:

Automated Test Suites

Performance & Load Testing (Locust)

CI/CD Pipeline

Security & Architectural Governance

License

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