Atomic Functions, Infinite Possibilities

import { Agent, property } from '@do-sdk/core';

// Define the structure for a line item in an order
interface LineItem {
  productId: string;
  quantity: number;
  unitPrice: number;
}

// Create an agent that encapsulates the 'calculateOrderTotal' function
export class OrderCalculator extends Agent {
  
  @property()
  async calculateOrderTotal(
    items: LineItem[], 
    taxRate: number
  ): Promise<{ subtotal: number; tax: number; total: number }> {
    
    // Calculate the subtotal from the items
    const subtotal = items.reduce(
      (acc, item) => acc + item.quantity * item.unitPrice, 0
    );

    // Calculate tax and the final total
    const tax = subtotal * taxRate;
    const total = subtotal + tax;

    // Return the detailed breakdown
    return { subtotal, tax, total };
  }
}