Implement Premium Feature Usage Tracking System

[Copilot]

Overview

This PR implements a comprehensive premium feature usage tracking system for the SSEC_Inventory WPF application, addressing the requirement to "show me my premium feature usage."

Features Added

🏗️ Core Infrastructure

• Data Model: PremiumFeatureUsage class with smart calculations for usage statistics, limits, and percentages
• Service Layer: PremiumFeatureManager with SQLite persistence, thread-safe operations, and async support
• Database Schema: Automatic SQLite database creation with proper indexing and constraints

🎨 User Interface

• Premium Usage Tab: New tab in the main window displaying comprehensive usage statistics
• Modern UI: Professional WPF user control with progress bars, status badges, and responsive design
• Interactive Features: Refresh data, reset feature usage, and real-time status indicators

📊 Usage Analytics

• Summary Statistics: Total features, usage counts, features at limits, most used features
• Detailed Tracking: Per-feature usage with limits, remaining quotas, and usage history
• Visual Indicators: Progress bars, color-coded status badges, and percentage calculations

🔧 Integration

• Automatic Tracking: Features are automatically tracked when used (e.g., tab navigation)
• Logging Integration: Full Serilog integration for audit trails and debugging
• Error Handling: Robust exception handling with user-friendly error messages

Technical Details

Database Schema

CREATE TABLE PremiumFeatureUsage (
    Id INTEGER PRIMARY KEY AUTOINCREMENT,
    FeatureName TEXT NOT NULL UNIQUE,
    UsageCount INTEGER NOT NULL DEFAULT 0,
    LastUsed DATETIME NOT NULL,
    FirstUsed DATETIME NOT NULL,
    UsageLimit INTEGER NOT NULL DEFAULT 0,
    IsActive BOOLEAN NOT NULL DEFAULT 1,
    Notes TEXT
);

Usage Example

// Record feature usage with limit
bool success = await premiumFeatureManager.RecordFeatureUsageAsync("Advanced Reporting", 50);

// Check if feature is at limit
var usage = await premiumFeatureManager.GetFeatureUsageAsync("Advanced Reporting");
if (usage != null && usage.IsLimitReached) {
    // Handle limit reached scenario
}

// Get comprehensive usage statistics
var summary = await premiumFeatureManager.GetUsageSummaryAsync();

UI Screenshots

The new "Premium Usage" tab provides:

• Summary Panel: Overview statistics with totals and key metrics
• Feature List: Detailed view of each feature with usage progress bars
• Interactive Controls: Refresh and reset functionality
• Status Indicators: Visual badges for features at their limits

Testing

• ✅ Unit Tests: Comprehensive test suite covering all core functionality
• ✅ Console Demo: Working demonstration application showing all features
• ✅ Integration Tests: Verified integration with existing WPF application
• ✅ Error Scenarios: Tested limit enforcement, database failures, and edge cases

Files Added/Modified

New Files

• Models/PremiumFeatureUsage.cs - Data model with smart calculations
• Services/PremiumFeatureManager.cs - Core service with SQLite persistence
• UserControls/PremiumFeatureUsageControl.xaml - Modern UI layout
• UserControls/PremiumFeatureUsageControl.xaml.cs - UI interaction logic
• Tests/PremiumFeatureUsageTests.cs - Comprehensive test suite
• PremiumFeatureDemo.cs - Console demonstration application
• PREMIUM_FEATURE_USAGE.md - Complete documentation

Modified Files

• MainWindow.xaml - Added Premium Usage tab with proper namespacing
• MainWindow.xaml.cs - Integrated premium feature tracking
• SSEC_Inventory.csproj - Fixed target framework compatibility (net9.0 → net8.0)

Benefits

For Users

• Transparency: Clear visibility into premium feature usage and limits
• Planning: Understanding of remaining quotas for better resource management
• History: Track usage patterns and trends over time

For Administrators

• Monitoring: Real-time usage tracking with comprehensive analytics
• Compliance: Complete audit trails for premium feature usage
• Management: Easy reset and adjustment capabilities

For Developers

• Extensibility: Simple API to add new premium features
• Maintainability: Clean separation of concerns with proper error handling
• Scalability: Efficient database operations with async support

Demo

A working console demonstration is included that shows:

• Feature usage recording and limit enforcement
• Usage statistics calculation and display
• Database persistence and data integrity
• Error handling and edge cases

Run with: dotnet run PremiumFeatureDemo.cs

This implementation provides a production-ready foundation for premium feature management that can be easily extended as the application grows.

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