17. Future Enhancements (Phase 2 & 3)

Features

• Cloud database integration (PostgreSQL/MySQL)
• Real-time synchronization across devices
• Offline-first architecture with sync queue
• Conflict resolution for concurrent edits

Technology Stack

• Backend: Upgrade to cloud-hosted FastAPI
• Database: PostgreSQL with connection pooling
• Sync: WebSocket for real-time updates
• Storage: AWS S3 or Azure Blob for file uploads

Benefits

• Access calculations from any device
• Automatic backup to cloud
• Team collaboration capabilities

Features

• User authentication (email/password)
• User profiles and preferences
• Role-based access control (Admin, User, Viewer)
• Shared workspaces for teams
• Calculation sharing with permissions

User Roles

Role	Permissions
Admin	Full access, user management, settings
User	Create, edit, delete own calculations
Viewer	Read-only access to shared calculations

Features

• Export to .xlsx format with styling
• Multiple sheets (Summary, Breakdown, History)
• Charts and visualizations
• Custom templates
• Batch export for multiple calculations

Excel Structure

Sheet 1: Summary
+-- Amount
+-- Currency
+-- Mode
+-- Total Pieces
+-- Total Notes
+-- Total Coins

Sheet 2: Detailed Breakdown
+-- Denomination
+-- Type (Note/Coin)
+-- Count
+-- Total Value

Sheet 3: History (All Calculations)
+-- Paginated list with all fields

Visualizations

• Usage Statistics: Calculations per day/week/month
• Currency Distribution: Pie chart showing currency usage
• Mode Preferences: Bar chart of optimization mode usage
• Amount Ranges: Histogram of calculation amounts
• Trend Analysis: Line graph of calculation volume over time

Metrics

• Total calculations performed
• Most used currency/mode
• Average calculation amount
• Bulk upload success rate
• OCR accuracy rate

Features

• Add custom currencies with denominations
• Define notes and coins for each currency
• Save currency configurations
• Import/export currency definitions

Custom Currency Configuration

{
  "currency_code": "BTC",
  "currency_name": "Bitcoin",
  "symbol": "?",
  "notes": [1, 0.5, 0.1, 0.05, 0.01],
  "coins": [0.001, 0.0001],
  "decimal_places": 8
}

Technology Stack

• Framework: React Native or Flutter
• Features: All desktop features + mobile-specific
• Camera Integration: Scan bills/receipts directly
• Offline Support: Full offline functionality

Mobile-Specific Features

• Camera-based OCR (instant scan)
• Push notifications for sync updates
• Biometric authentication (Face ID, Fingerprint)
• Share results via SMS/WhatsApp
• Widget for quick calculations

Features

• Live currency conversion
• Historical exchange rate data
• Multi-currency calculations
• Auto-update rates daily

API Integration

# Exchange rate API integration
import requests

def get_exchange_rate(from_currency: str, to_currency: str) -> float:
    """Fetch live exchange rate."""
    api_url = f"https://api.exchangerate-api.com/v4/latest/{from_currency}"
    response = requests.get(api_url)
    data = response.json()
    return data['rates'][to_currency]

# Example: Convert USD to INR
rate = get_exchange_rate('USD', 'INR')
amount_inr = 100 * rate  # 100 USD to INR

Features

• Complete audit log of all actions
• User activity tracking
• Calculation history with timestamps
• Export audit reports (PDF, CSV)

Audit Log Example

Timestamp	User	Action	Details
2025-01-15 12:00	user@example.com	Calculate	1850 INR (greedy)
2025-01-15 12:05	user@example.com	Bulk Upload	100 rows (CSV)
2025-01-15 12:10	admin@example.com	Export	History (50 items)

Public REST API

• API keys for authentication
• Rate limiting (1000 requests/hour)
• Comprehensive documentation (OpenAPI/Swagger)
• Webhooks for event notifications

Example API Usage

# Calculate denomination
curl -X POST https://api.currencycalculator.com/v1/calculate \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "amount": 1850,
    "currency": "INR",
    "mode": "greedy"
  }'

Features

• Custom plugins for extended functionality
• Plugin marketplace
• API for plugin developers
• Sandboxed execution environment

Plugin Examples

• Tax Calculator: Calculate taxes on amounts
• Currency Converter: Advanced multi-currency conversion
• Receipt Generator: Generate formatted receipts
• Budget Tracker: Track spending across calculations