/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.mail2.jakarta.util;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  
  import org.junit.jupiter.api.Test;
  
  import jakarta.mail.internet.InternetAddress;
  
  public class IDNEmailAddressConverterTest {
  
      private static final String AUSTRIAN_IDN_EMAIL_ADDRESS = "noreply@d\u00F6m\u00E4in.example";
      private static final String CZECH_IDN_EMAIL_ADDRESS = "noreply@\u010Desk\u00E1republika.icom.museum";
      private static final String RUSSIAN_IDN_EMAIL_ADDRESS = "noreply@\u0440\u043E\u0441\u0441\u0438\u044F.\u0438\u043A\u043E\u043C.museum";
  
      private static final String GERMAN_IDN_EMAIL_NAME = "noreply@d\u00F6m\u00E4in.example";
  
      private static final String[] IDN_EMAIL_ADDRESSES = { AUSTRIAN_IDN_EMAIL_ADDRESS, CZECH_IDN_EMAIL_ADDRESS, RUSSIAN_IDN_EMAIL_ADDRESS };
  
      private final IDNEmailAddressConverter idnEmailConverter = new IDNEmailAddressConverter();
  
      @Test
      public void testConvertInvalidEmailAddressToAscii() {
          assertNull(idnEmailConverter.toASCII(null));
          assertEquals("", idnEmailConverter.toASCII(""));
          assertEquals("@", idnEmailConverter.toASCII("@"));
          assertEquals("@@", idnEmailConverter.toASCII("@@"));
          assertEquals("foo", idnEmailConverter.toASCII("foo"));
          assertEquals("foo@", idnEmailConverter.toASCII("foo@"));
          assertEquals("@badhost.com", idnEmailConverter.toASCII("@badhost.com"));
      }
  
      @Test
      public void testIDNEmailAddressToAsciiConversion() {
          assertEquals("noreply@xn--dmin-moa0i.example", idnEmailConverter.toASCII(AUSTRIAN_IDN_EMAIL_ADDRESS));
          assertEquals("noreply@xn--h1alffa9f.xn--h1aegh.museum", idnEmailConverter.toASCII(RUSSIAN_IDN_EMAIL_ADDRESS));
      }
  
      @Test
      public void testInternetAddressToAsciiConversion() throws Exception {
          final InternetAddress address = new InternetAddress(idnEmailConverter.toASCII(AUSTRIAN_IDN_EMAIL_ADDRESS));
          assertEquals(AUSTRIAN_IDN_EMAIL_ADDRESS, idnEmailConverter.toUnicode(address));
  
          final InternetAddress addressWithPersonalName = new InternetAddress(idnEmailConverter.toASCII(AUSTRIAN_IDN_EMAIL_ADDRESS), GERMAN_IDN_EMAIL_NAME);
          assertEquals(AUSTRIAN_IDN_EMAIL_ADDRESS, idnEmailConverter.toUnicode(addressWithPersonalName));
      }
  
      @Test
      public void testMultipleIDNEmailAddressToAsciiConversion() {
          assertEquals("noreply@xn--dmin-moa0i.example", idnEmailConverter.toASCII(idnEmailConverter.toASCII(AUSTRIAN_IDN_EMAIL_ADDRESS)));
      }
  
      @Test
      public void testNonIDNEmailAddressToAsciiConversion() {
          assertEquals("me@home.com", idnEmailConverter.toASCII("me@home.com"));
      }
  
      @Test
      public void testRoundTripConversionOfIDNEmailAddress() {
          for (final String email : IDN_EMAIL_ADDRESSES) {
              assertEquals(email, idnEmailConverter.toUnicode(idnEmailConverter.toASCII(email)));
          }
      }
  
  }