import franck.cse5910.Gold;
import franck.cse5910.Currency;
import javax.swing.JOptionPane;
import type.lib.ToolBox;

public class GoldPrice 
{
    public static void main(String[] args) 
    {
	String amountAsString = JOptionPane.showInputDialog(null,
							    "Enter the amount of gold in kilos",
							    "The Price of Gold",
							    JOptionPane.QUESTION_MESSAGE);
	double amount = Double.parseDouble(amountAsString);
	
	ToolBox.crash(amount < 0, "The amount of gold cannot be negative");
	
	final int GRAMS_PER_KILO = 1000;
	double ouncePerKilo = GRAMS_PER_KILO / Gold.GRAMS_PER_TROY_OUNCE;
	double priceInUSD = amount * ouncePerKilo * Gold.price();
	
	double priceInCAD = Currency.convert(priceInUSD, Currency.USD, Currency.CAD);
	
	String priceAsString = String.format("$ %,.2f", priceInCAD);
	String title = "The price of " + String.format("%.2f", amount) + " kilos of gold";
	JOptionPane.showMessageDialog(null, 
				      priceAsString,
				      title,
				      JOptionPane.INFORMATION_MESSAGE);
    }
}