🛍️ Offline POS System (WPF / C# / .NET)

A desktop Offline-First Point of Sale (POS) application built with WPF (.NET) using a clean MVVM architecture.
It supports offline data entry with local storage (SQLite), intelligent sync with a backend ERP API, intuitive POS UI, and PDF receipt printing.

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🚀 Features

🔹 Core POS Functionality

• Add products to invoice with a single click
• Intelligent item merging
• Real-time total calculations

🌐 Offline-First & Sync

• Offline storage with SQLite
• Local sync queue for create/update operations
• Automatic and manual synchronization with backend REST API

🧠 Architecture

• MVVM pattern
• Clean separation between UI, logic, and data
• Uses HttpClient for REST API calls

🖨️ Printing

• Export receipts/invoices to PDF
• Style-ready invoice layout without scroll (printing-friendly)

🎨 UI

• WPF UI with reusable controls (ProductCard, Invoice view, etc.)
• Vector icons and consistent styles