FlashCheckout

Overview

FlashCheckout is a comprehensive, enterprise-grade Point of Sale (POS) system built with modern WPF architecture using the Prism framework. This modular application provides complete retail management capabilities, from sales processing and inventory management to customer relations and comprehensive reporting.

The system features a sophisticated modular architecture with automatic version detection, multi-language support, hardware integration, and a robust service layer that handles all business logic with clean separation of concerns.

Architecture

Modular Design

FlashCheckout follows a Prism-based modular architecture with 13 specialized modules:

• Sales Module: Cashier interface, suspended sales, weight input, batch selection, receipt reprinting
• Inventory Module: Product management, stock tracking, batch management, purchase orders, supplier management
• Customers Module: Customer management, purchase history, customer relations
• Returns Module: Return processing, return policies, return validation
• Users Module: User management, authentication, permissions, security events, admin recovery
• Shift Management: Shift tracking, cash management, employee time tracking, handover
• Reports Module: Comprehensive reporting, dashboards, performance analytics, security dashboards
• Settings Module: System configuration, localization, themes, backup, hardware, receipt, tax settings
• Hardware Module: Hardware device management and monitoring
• Mobile Sync Module: Mobile device synchronization
• Promotions Module: Promotion management and application
• Coupons Module: Coupon management system
• Orders Module: Order processing and management
• Dashboard Module: Main dashboard and analytics

Core Components

FlashCheckout.Core

• MVVM Infrastructure: ViewModelBase, RegionViewModelBase, DialogViewModelBase
• Event System: PubSubEvent-based communication (SaleCompletedEvent, StockUpdatedEvent, etc.)
• Region Management: Static region name constants for navigation

FlashCheckout.Services

Comprehensive service layer with ~572 business logic files:

• Domain Layer: Entities, Value Objects, Enums, Domain Events
• Data Layer: DbContext, Repositories, Migrations, Seeding
• Application Services: Sales, Inventory, Customers, Orders, Returns, Users, Shifts, Reporting, Promotions, etc.
• Hardware Services: Printers, Scanners, Card Readers, Mobile Payments, Barcode Labels
• Mobile Communication: Bluetooth/WiFi transport, encryption, session management, message routing
• Supporting Services: Backup, Security, Localization, Licensing, Import/Export, Receipts, Barcodes, Monitoring

FlashCheckout.Shared.UI

Shared UI components and resources:

• Behaviors: Focus, PasswordBox binding, Snackbar initialization, Window close
• Controls: Loading overlays, custom controls
• Converters: 50+ value converters for data binding
• Resources: Multi-language support (English, Arabic, Spanish), fonts, images, audio
• Services: Dialog, Loading, Navigation, RTL layout services

Key Features

Sales & Transactions

• Advanced Cashier Interface: Intuitive sales processing with real-time calculations
• Suspended Sales: Save and resume sales sessions
• Weight Input: Support for weighted products
• Batch Selection: Intelligent batch allocation for inventory tracking
• Receipt Management: Print, preview, and reprint receipts
• Tax Calculation: Comprehensive tax calculation engine
• Pricing Engine: Dynamic pricing with promotions and discounts

Inventory Management

• Product Management: Complete product lifecycle management
• Stock Tracking: Real-time stock movement tracking
• Batch Management: Advanced batch tracking and allocation
• Purchase Orders: Full purchase order workflow
• Supplier Management: Supplier relations and payment tracking
• Stock Transfers: Inter-location stock transfers
• Barcode Generation: Generate and print product barcodes

Customer Management

• Customer Database: Comprehensive customer information management
• Purchase History: Track customer purchase patterns
• Customer Relations: Enhanced customer service capabilities

Returns & Refunds

• Return Processing: Streamlined return workflow
• Return Policies: Configurable return policy engine
• Return Validation: Enhanced validation service with business rules
• Return Audit: Complete audit trail for returns

User & Security

• User Management: Complete user lifecycle management
• Role-Based Access Control: Granular permission system
• Authentication: Secure authentication with password policies
• Security Events: Comprehensive security event logging
• Admin Recovery: Admin account recovery mechanisms
• Session Management: Secure session handling with timeout

Shift Management

• Shift Tracking: Complete shift lifecycle management
• Cash Management: Cash drawer tracking and reconciliation
• Employee Time Tracking: Time entry and attendance
• Shift Handover: Seamless shift transitions
• Shift Reporting: Detailed shift statistics and reports

Reporting & Analytics

• Sales Reports: Comprehensive sales reporting
• Performance Dashboard: Real-time performance metrics
• Security Dashboard: Security event monitoring
• Custom Reports: Flexible report generation
• Excel Export: Export reports to Excel format
• FastReport Integration: Advanced reporting capabilities

Hardware Integration

• Thermal Printers: Receipt printing with high-quality output
• Barcode Scanners: Multiple scanner types (keyboard wedge, industrial)
• Card Readers: Payment card processing
• Mobile Payments: Mobile payment integration
• Barcode Labels: Product label printing
• Hardware Monitoring: Device status monitoring

Mobile Sync

• Bluetooth/WiFi Transport: Multiple communication protocols
• Encrypted Communication: Secure data transmission
• Session Management: Reliable session handling
• Message Routing: Intelligent message routing
• QR Code Pairing: Easy device pairing

Localization & Internationalization

• Multi-Language Support: English, Arabic, Spanish
• RTL Support: Right-to-left layout for Arabic
• Localized Receipts: Language-specific receipt formatting
• Keyboard Layout: Language-specific keyboard support
• Currency Formatting: Locale-aware currency display

System Features

• Backup & Restore: Automated backup with compression and integrity checks
• Cloud Backup: Cloud storage integration
• Theme Support: Light/dark theme switching
• Database Maintenance: Automated database optimization
• Performance Monitoring: System performance tracking
• License Management: Software licensing system

Technical Stack

Core Technologies

• C#: Primary development language
• .NET 6: Modern .NET runtime
• WPF: Windows Presentation Foundation for UI
• Prism Framework: Modular application framework
• Entity Framework: ORM for data access
• SQLite: Embedded database
• Material Design: Modern UI framework

Architecture Patterns

• MVVM: Model-View-ViewModel pattern
• Repository Pattern: Data access abstraction
• Service Layer: Business logic separation
• Dependency Injection: Loose coupling
• Event-Driven Architecture: PubSubEvent communication
• Modular Architecture: Plugin-based module system

Development Practices

• Clean Architecture: Separation of concerns
• SOLID Principles: Object-oriented design
• Domain-Driven Design: Business domain modeling
• Test-Driven Development: Comprehensive test coverage
• Code Reusability: Shared components and services

Project Structure

The application consists of ~920 files organized into:

• Shell Application: Main WPF application entry point
• 13 Modules: Feature-specific modules with views and view models
• Services Layer: ~572 business logic files
• Shared UI: Reusable UI components and resources
• Core Infrastructure: MVVM base classes and event system
• Test Projects: Unit tests for services and modules

Project Status

Status: Enterprise Application
Architecture: Modular Prism WPF
Total Files: ~920 files
Modules: 13 specialized modules
Languages: English, Arabic, Spanish

FlashCheckout represents a comprehensive enterprise POS solution with modern architecture, extensive feature set, and robust business logic implementation.