/**
 * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
 *
 * You may not modify, use, reproduce, or distribute this software except in
 * compliance with the terms of the License at:
 * http://java.net/projects/javaeetutorial/pages/BerkeleyLicense
 */
package javaeetutorial.convertersecure.ejb;

import java.math.BigDecimal;
import java.security.Principal;
import javax.ejb.Stateless;
import javax.annotation.Resource;
import javax.ejb.SessionContext;
import javax.annotation.security.DeclareRoles;
import javax.annotation.security.RolesAllowed;

/**
 * This is the bean class for the ConverterBean enterprise bean.
 */
@Stateless
@DeclareRoles("TutorialUser")
public class ConverterBean {

    @Resource
    SessionContext ctx;
    private final BigDecimal yenRate = new BigDecimal("104.34");
    private final BigDecimal euroRate = new BigDecimal("0.007");
    
    @RolesAllowed("TutorialUser")
    public BigDecimal dollarToYen(BigDecimal dollars) {
        BigDecimal result = new BigDecimal("0.0");
        Principal callerPrincipal = ctx.getCallerPrincipal();
        if (ctx.isCallerInRole("TutorialUser")) {
            result = dollars.multiply(yenRate);
            return result.setScale(2, BigDecimal.ROUND_UP);
        } else {
            return result.setScale(2, BigDecimal.ROUND_UP);
        }
    }
    
    @RolesAllowed("TutorialUser")
    public BigDecimal yenToEuro(BigDecimal yen) {
        BigDecimal result = new BigDecimal("0.0");
        Principal callerPrincipal = ctx.getCallerPrincipal();
        if (ctx.isCallerInRole("TutorialUser")) {
            result = yen.multiply(euroRate);
            return result.setScale(2, BigDecimal.ROUND_UP);
        } else {
            return result.setScale(2, BigDecimal.ROUND_UP);
        }
    }
}
