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package netukar.exchange.struts;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import netukar.exchange.ExchangeList;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;

/**
 *
 * @author radovan
 */
public class CalculateExchangeAction extends Action {

    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws ExchangeListException {

        try {
            ExchangeList exchange = new ExchangeList();
            double amount = Double.parseDouble(request.getParameter("amount"));
            String from = request.getParameter("from");
            String to = request.getParameter("to");

            double result = exchange.calculate(amount, from, to);
            request.setAttribute("result", exchange.format(result));
            request.setAttribute("amount", amount);
            request.setAttribute("from", from);
            request.setAttribute("to", to);

            return mapping.findForward("success");
        }
        catch (NumberFormatException ex) {
            throw new ExchangeListException("Invalid number format");
        }
        catch (IllegalArgumentException ex) {
            throw new ExchangeListException("Unsupported currency");
        }
    }
}