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package org.apache.james.events;

import static org.apache.james.events.EventDeadLettersContract.EVENT_1;
import static org.apache.james.events.EventDeadLettersContract.EVENT_2;
import static org.apache.james.events.EventDeadLettersContract.GROUP_A;
import static org.apache.james.events.EventDeadLettersContract.GROUP_B;
import static org.apache.james.events.EventDeadLettersContract.INSERTION_ID_1;
import static org.apache.james.events.EventDeadLettersContract.INSERTION_ID_2;
import static org.apache.james.events.EventDeadLettersContract.INSERTION_ID_3;
import static org.assertj.core.api.Assertions.assertThat;

import org.apache.james.backends.cassandra.CassandraCluster;
import org.apache.james.backends.cassandra.CassandraClusterExtension;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.RegisterExtension;

class CassandraEventDeadLettersDAOTest {

    @RegisterExtension
    static CassandraClusterExtension cassandraClusterExtension = new CassandraClusterExtension(CassandraEventDeadLettersModule.MODULE);

    private CassandraEventDeadLettersDAO cassandraEventDeadLettersDAO;

    @BeforeEach
    void setUp(CassandraCluster cassandraCluster) {
        EventSerializer eventSerializer = new EventBusTestFixture.TestEventSerializer();
        cassandraEventDeadLettersDAO = new CassandraEventDeadLettersDAO(cassandraCluster.getConf(), eventSerializer);
    }

    @Test
    void removeEventShouldSucceededWhenRemoveStoredEvent() {
        cassandraEventDeadLettersDAO.store(GROUP_A, EVENT_1, INSERTION_ID_1).block();

        cassandraEventDeadLettersDAO.removeEvent(GROUP_A, INSERTION_ID_1).block();

        assertThat(cassandraEventDeadLettersDAO
                .retrieveInsertionIdsWithGroup(GROUP_A)
                .collectList().block())
            .isEmpty();
    }

    @Test
    void retrieveFailedEventShouldReturnEmptyWhenDefault() {
        assertThat(cassandraEventDeadLettersDAO
                .retrieveFailedEvent(GROUP_A, INSERTION_ID_1)
                .blockOptional().isPresent())
            .isFalse();
    }

    @Test
    void retrieveFailedEventShouldReturnStoredEvent() {
        cassandraEventDeadLettersDAO.store(GROUP_A, EVENT_1, INSERTION_ID_1).block();
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_2, INSERTION_ID_2).block();

        assertThat(cassandraEventDeadLettersDAO
                .retrieveFailedEvent(GROUP_B, INSERTION_ID_2)
                .blockOptional().get())
            .isEqualTo(EVENT_2);
    }

    @Test
    void retrieveInsertionIdsWithGroupShouldReturnEmptyWhenDefault() {
        assertThat(cassandraEventDeadLettersDAO
                .retrieveInsertionIdsWithGroup(GROUP_A)
                .collectList().block())
            .isEmpty();
    }

    @Test
    void retrieveInsertionIdsWithGroupShouldReturnStoredInsertionId() {
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_1).block();
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_2, INSERTION_ID_2).block();
        cassandraEventDeadLettersDAO.store(GROUP_B, EventDeadLettersContract.EVENT_3, INSERTION_ID_3).block();

        assertThat(cassandraEventDeadLettersDAO
                .retrieveInsertionIdsWithGroup(GROUP_B)
                .collectList().block())
            .containsOnly(INSERTION_ID_1, INSERTION_ID_2, INSERTION_ID_3);
    }

    @Test
    void shouldReturnTrueWhenEventStored() {
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_1).block();
        assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isTrue();
    }

    @Test
    void shouldReturnTrueWhenNoEventStored() {
        assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isFalse();
    }

    @Test
    void shouldReturnTrueWhenEventsStoredAndRemovedSome() {
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_1).block();
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_2).block();
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_3).block();

        assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isTrue();

        cassandraEventDeadLettersDAO.removeEvent(GROUP_B, INSERTION_ID_3).block();

        assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isTrue();
    }

    @Test
    void shouldReturnFalseWhenRemovedAllEventsStored() {
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_1).block();
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_2).block();
        cassandraEventDeadLettersDAO.store(GROUP_B, EVENT_1, INSERTION_ID_3).block();

        assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isTrue();

        cassandraEventDeadLettersDAO.removeEvent(GROUP_B, INSERTION_ID_3).block();
        cassandraEventDeadLettersDAO.removeEvent(GROUP_B, INSERTION_ID_2).block();
        cassandraEventDeadLettersDAO.removeEvent(GROUP_B, INSERTION_ID_1).block();

        assertThat(cassandraEventDeadLettersDAO.containEvents().block()).isFalse();
    }

}
