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package org.apache.james.transport.mailets;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatCode;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.net.UnknownHostException;

import javax.mail.MessagingException;

import org.apache.james.core.MailAddress;
import org.apache.james.core.builder.MimeMessageBuilder;
import org.apache.james.dnsservice.api.DNSService;
import org.apache.mailet.Mail;
import org.apache.mailet.base.MailAddressFixture;
import org.apache.mailet.base.test.FakeMail;
import org.apache.mailet.base.test.FakeMailContext;
import org.apache.mailet.base.test.FakeMailetConfig;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

public class BounceTest {

    private static final String MAILET_NAME = "mailetName";

    private Bounce bounce;
    private FakeMailContext fakeMailContext;

    @BeforeEach
    void setUp() throws Exception {
        DNSService dnsService = mock(DNSService.class);
        bounce = new Bounce(dnsService);
        fakeMailContext = FakeMailContext.defaultContext();

        when(dnsService.getLocalHost()).thenThrow(new UnknownHostException());
    }

    @Test
    void getMailetInfoShouldReturnValue() {
        assertThat(bounce.getMailetInfo()).isEqualTo("Bounce Mailet");
    }

    @Test
    void initShouldThrowWhenUnkownParameter() {
        FakeMailetConfig mailetConfig = FakeMailetConfig.builder()
                .mailetName(MAILET_NAME)
                .mailetContext(fakeMailContext)
                .setProperty("unknown", "error")
                .build();

        assertThatThrownBy(() -> bounce.init(mailetConfig))
            .isInstanceOf(MessagingException.class);
    }

    @Test
    void initShouldNotThrowWhenOnMailetExceptionParameter() {
        FakeMailetConfig mailetConfig = FakeMailetConfig.builder()
                .mailetName(MAILET_NAME)
                .mailetContext(fakeMailContext)
                .setProperty("onMailetException", "ignore")
                .build();

        assertThatCode(() -> bounce.init(mailetConfig))
            .doesNotThrowAnyException();
    }

    @Test
    void initShouldNotThrowWhenOnMatchExceptionParameter() {
        FakeMailetConfig mailetConfig = FakeMailetConfig.builder()
                .mailetName(MAILET_NAME)
                .mailetContext(fakeMailContext)
                .setProperty("onMatchException", "ignore")
                .build();

        assertThatCode(() -> bounce.init(mailetConfig))
            .doesNotThrowAnyException();
    }

    @Test
    void initShouldNotThrowWhenEveryParameters() throws Exception {
        FakeMailetConfig mailetConfig = FakeMailetConfig.builder()
                .mailetName(MAILET_NAME)
                .mailetContext(fakeMailContext)
                .setProperty("debug", "true")
                .setProperty("passThrough", "false")
                .setProperty("fakeDomainCheck", "false")
                .setProperty("inline", "all")
                .setProperty("attachment", "none")
                .setProperty("message", "custom message")
                .setProperty("notice", "")
                .setProperty("sender", "sender@domain.org")
                .setProperty("sendingAddress", "sender@domain.org")
                .setProperty("prefix", "my prefix")
                .setProperty("attachError", "true")
                .build();

        bounce.init(mailetConfig);
    }

    @Test
    void bounceShouldReturnAMailToTheSenderWithoutAttributes() throws Exception {
        FakeMailetConfig mailetConfig = FakeMailetConfig.builder()
                .mailetName(MAILET_NAME)
                .mailetContext(fakeMailContext)
                .build();
        bounce.init(mailetConfig);

        MailAddress senderMailAddress = new MailAddress("sender@domain.com");
        FakeMail mail = FakeMail.builder()
            .name(MAILET_NAME)
            .sender(senderMailAddress)
            .recipient(MailAddressFixture.ANY_AT_JAMES)
            .mimeMessage(MimeMessageBuilder.mimeMessageBuilder()
                .setText("My content"))
            .build();

        bounce.service(mail);

        FakeMailContext.SentMail expected = FakeMailContext.sentMailBuilder()
            .recipient(senderMailAddress)
            .fromMailet()
            .build();
        assertThat(fakeMailContext.getSentMails()).containsOnly(expected);
    }

    @Test
    void bounceShouldNotSendEmailToNullSender() throws Exception {
        FakeMailetConfig mailetConfig = FakeMailetConfig.builder()
                .mailetName(MAILET_NAME)
                .mailetContext(fakeMailContext)
                .build();
        bounce.init(mailetConfig);

        FakeMail mail = FakeMail.builder()
            .name(MAILET_NAME)
            .sender(MailAddress.nullSender())
            .recipient(MailAddressFixture.ANY_AT_JAMES)
            .mimeMessage(MimeMessageBuilder.mimeMessageBuilder()
                .setText("My content"))
            .build();

        bounce.service(mail);

        assertThat(fakeMailContext.getSentMails()).isEmpty();
    }

    @Test
    void bounceShouldChangeTheStateWhenNoSenderAndPassThroughEqualsFalse() throws Exception {
        FakeMailetConfig mailetConfig = FakeMailetConfig.builder()
                .mailetName(MAILET_NAME)
                .mailetContext(fakeMailContext)
                .setProperty("passThrough", "false")
                .build();
        bounce.init(mailetConfig);

        FakeMail mail = FakeMail.builder()
            .name(MAILET_NAME)
            .recipient(MailAddressFixture.ANY_AT_JAMES)
            .mimeMessage(MimeMessageBuilder.mimeMessageBuilder()
                .setText("My content"))
            .build();

        bounce.service(mail);

        assertThat(mail.getState()).isEqualTo(Mail.GHOST);
    }

    @Test
    void bounceShouldNotChangeTheStateWhenNoSenderAndPassThroughEqualsTrue() throws Exception {
        FakeMailetConfig mailetConfig = FakeMailetConfig.builder()
                .mailetName(MAILET_NAME)
                .mailetContext(fakeMailContext)
                .setProperty("passThrough", "true")
                .build();
        bounce.init(mailetConfig);

        String initialState = "initial";
        FakeMail mail = FakeMail.builder()
            .name(MAILET_NAME)
            .state(initialState)
            .recipient(MailAddressFixture.ANY_AT_JAMES)
            .mimeMessage(MimeMessageBuilder.mimeMessageBuilder()
                .setText("My content"))
            .build();

        bounce.service(mail);

        assertThat(mail.getState()).isEqualTo(initialState);
    }

    @Test
    void bounceShouldAddPrefixToSubjectWhenPrefixIsConfigured() throws Exception {
        FakeMailetConfig mailetConfig = FakeMailetConfig.builder()
                .mailetName(MAILET_NAME)
                .mailetContext(fakeMailContext)
                .setProperty("prefix", "pre")
                .build();
        bounce.init(mailetConfig);

        FakeMail mail = FakeMail.builder()
            .name(MAILET_NAME)
            .sender(MailAddressFixture.ANY_AT_JAMES)
            .recipient(MailAddressFixture.ANY_AT_JAMES2)
            .mimeMessage(MimeMessageBuilder.mimeMessageBuilder()
                .setSubject("My subject"))
            .build();

        bounce.service(mail);

        assertThat(mail.getMessage().getSubject()).isEqualTo("pre My subject");
    }
}
