ROI Calculator Modules

This directory contains the modular ROI Calculator implementation, split into focused, maintainable modules.

Module Structure

Core Modules

calculator-core.js - Main ROICalculator class with calculation logic
chart-manager.js - Chart.js integration and chart rendering
ui-manager.js - DOM updates, table rendering, and metric display
export-manager.js - PDF and CSV export functionality
input-utils.js - Input validation, parsing, and formatting utilities
roi-calculator-app.js - Main application coordinator class

Integration

../roi-calculator-modular.js - Global function wrappers for backward compatibility

Key Improvements

Modular Architecture: Each module has a single responsibility
Error Handling: Comprehensive try-catch blocks with graceful fallbacks
No Global Variables: App instance contained in window.ROICalculatorApp
Type Safety: Input validation and null checks throughout
Separation of Concerns: Calculation, UI, charts, and exports are separated

Usage

All modules are automatically loaded via the HTML template. The ROICalculatorApp class coordinates all modules and provides the same public API as the original monolithic version.

Backward Compatibility

All existing HTML onclick handlers and function calls continue to work through the global wrapper functions in roi-calculator-modular.js.

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