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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
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package org.apache.james;

import static org.assertj.core.api.Assertions.assertThat;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;

import org.apache.james.modules.TestJMAPServerModule;
import org.apache.james.modules.protocols.ImapGuiceProbe;
import org.apache.james.util.concurrent.NamedThreadFactory;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.RegisterExtension;

class JamesServerWithRetryConnectionTest {
    private static final long WAITING_TIME = TimeUnit.MILLISECONDS.convert(10, TimeUnit.SECONDS);

    private static final DockerElasticSearchExtension dockerElasticSearch = new DockerElasticSearchExtension();
    private static final CassandraExtension dockerCassandra = new CassandraExtension();

    @RegisterExtension
    static JamesServerExtension testExtension = TestingDistributedJamesServerBuilder.withSearchConfiguration(SearchConfiguration.elasticSearch())
        .extension(dockerElasticSearch)
        .extension(dockerCassandra)
        .server(configuration -> CassandraJamesServerMain.createServer(configuration)
            .overrideWith(new TestJMAPServerModule()))
        .disableAutoStart()
        .build();

    private SocketChannel socketChannel;
    private ExecutorService executorService;

    @BeforeEach
    void setUp() throws IOException {
        ThreadFactory threadFactory = NamedThreadFactory.withClassName(getClass());
        executorService = Executors.newFixedThreadPool(1, threadFactory);
        socketChannel = SocketChannel.open();
    }

    @AfterEach
    void after() throws IOException {
        socketChannel.close();
        executorService.shutdownNow();
    }

    @Test
    void serverShouldStartAtDefault(GuiceJamesServer server) throws Exception {
        assertThatServerStartCorrectly(server);
    }

    @Test
    void serverShouldRetryToConnectToCassandraWhenStartService(GuiceJamesServer server) throws Exception {
        dockerCassandra.getCassandra().pause();

        waitToStartContainer(WAITING_TIME, dockerCassandra.getCassandra()::unpause);

        assertThatServerStartCorrectly(server);
    }

    @Test
    void serverShouldRetryToConnectToElasticSearchWhenStartService(GuiceJamesServer server) throws Exception {
        dockerElasticSearch.getDockerES().pause();

        waitToStartContainer(WAITING_TIME, dockerElasticSearch.getDockerES()::unpause);

        assertThatServerStartCorrectly(server);
    }
    
    private void waitToStartContainer(long waitingTime, Runnable action) {
        executorService.submit(() -> {
            try {
                Thread.sleep(waitingTime);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            action.run();
        });
    }

    private void assertThatServerStartCorrectly(GuiceJamesServer server) throws Exception {
        server.start();
        socketChannel.connect(new InetSocketAddress("127.0.0.1", server.getProbe(ImapGuiceProbe.class).getImapPort()));
        assertThat(getServerConnectionResponse(socketChannel)).startsWith("* OK JAMES IMAP4rev1 Server");
    }

    private String getServerConnectionResponse(SocketChannel socketChannel) throws IOException {
        ByteBuffer byteBuffer = ByteBuffer.allocate(1000);
        socketChannel.read(byteBuffer);
        byte[] bytes = byteBuffer.array();
        return new String(bytes, StandardCharsets.UTF_8);
    }
}
