// Copyright 2016 The Nomulus Authors. All Rights Reserved.
//
// Licensed 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 google.registry.util;

import static com.google.common.truth.Truth.assertThat;
import static google.registry.util.SendEmailUtils.sendEmail;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import com.google.common.collect.ImmutableList;
import google.registry.testing.ExceptionRule;
import google.registry.testing.InjectRule;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.Message.RecipientType;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;

/** Unit tests for {@link SendEmailUtils}. */
@RunWith(MockitoJUnitRunner.class)
public class SendEmailUtilsTest {

  @Rule
  public final ExceptionRule thrown = new ExceptionRule();

  @Rule
  public final InjectRule inject = new InjectRule();

  @Mock
  private SendEmailService emailService;

  private Message message;

  @Before
  public void init() throws Exception {
    inject.setStaticField(SendEmailUtils.class, "emailService", emailService);
    message = new MimeMessage(Session.getDefaultInstance(new Properties(), null));
    when(emailService.createMessage()).thenReturn(message);
  }

  @Test
  public void testSuccess_sendToOneAddress() throws Exception {
    assertThat(sendEmail(
        "johnny@fakesite.tld",
        "Welcome to the Internet",
        "It is a dark and scary place.")).isTrue();
    verifyMessageSent();
    assertThat(message.getRecipients(RecipientType.TO)).asList()
        .containsExactly(new InternetAddress("johnny@fakesite.tld"));
    assertThat(message.getAllRecipients()).asList()
        .containsExactly(new InternetAddress("johnny@fakesite.tld"));
  }

  @Test
  public void testSuccess_sendToMultipleAddresses() throws Exception {
    assertThat(sendEmail(
        ImmutableList.of("foo@example.com", "bar@example.com"),
        "Welcome to the Internet",
        "It is a dark and scary place.")).isTrue();
    verifyMessageSent();
    assertThat(message.getAllRecipients()).asList().containsExactly(
        new InternetAddress("foo@example.com"),
        new InternetAddress("bar@example.com"));
  }

  @Test
  public void testSuccess_ignoresMalformedEmailAddress() throws Exception {
    assertThat(sendEmail(
        ImmutableList.of("foo@example.com", "1iñvalidemail"),
        "Welcome to the Internet",
        "It is a dark and scary place.")).isTrue();
    verifyMessageSent();
    assertThat(message.getAllRecipients()).asList()
        .containsExactly(new InternetAddress("foo@example.com"));
  }

  @Test
  public void testFailure_onlyGivenMalformedAddress() throws Exception {
    assertThat(sendEmail(
        ImmutableList.of("1iñvalidemail"),
        "Welcome to the Internet",
        "It is a dark and scary place.")).isFalse();
    verify(emailService, never()).sendMessage(any(Message.class));
  }

  @Test
  public void testFailure_exceptionThrownDuringSend() throws Exception {
    doThrow(new MessagingException()).when(emailService).sendMessage(any(Message.class));
    assertThat(sendEmail(
        ImmutableList.of("foo@example.com"),
        "Welcome to the Internet",
        "It is a dark and scary place.")).isFalse();
    verifyMessageSent();
    assertThat(message.getAllRecipients()).asList()
        .containsExactly(new InternetAddress("foo@example.com"));
  }

  private void verifyMessageSent() throws Exception {
    verify(emailService).sendMessage(message);
    assertThat(message.getSubject()).isEqualTo("Welcome to the Internet");
    assertThat(message.getContent()).isEqualTo("It is a dark and scary place.");
  }
}