/*
 * 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.
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package org.apache.pulsar.tests.integration.io.sources.debezium;

import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.apache.pulsar.tests.integration.containers.DebeziumPostgreSqlContainer;
import org.apache.pulsar.tests.integration.containers.PulsarContainer;
import org.apache.pulsar.tests.integration.docker.ContainerExecResult;
import org.apache.pulsar.tests.integration.io.sources.SourceTester;
import org.apache.pulsar.tests.integration.topologies.PulsarCluster;
import org.testng.Assert;

/**
 * A tester for testing Debezium Postgresql source.
 *
 * It reads binlog from Postgres, and store the debezium output into Pulsar.
 * This test verify that the target topic contains wanted number messages.
 *
 * Debezium Postgresql Container is "debezium/example-postgres:0.10",
 * which is a Postgresql database server preconfigured with an inventory database.
 */
@Slf4j
public class DebeziumPostgreSqlSourceTester extends SourceTester<DebeziumPostgreSqlContainer> {

    private static final String NAME = "debezium-postgres";

    private final String pulsarServiceUrl;

    @Getter
    private DebeziumPostgreSqlContainer debeziumPostgresqlContainer;

    private final PulsarCluster pulsarCluster;

    private final AtomicReference<String> confirmedFlushLsn = new AtomicReference<>("not read yet");

    public DebeziumPostgreSqlSourceTester(PulsarCluster cluster) {
        super(NAME);
        this.pulsarCluster = cluster;
        /*
        todo (possibly solvable by debezium upgrade?):
         figure out why last message is lost with larger numEntriesToInsert.
        I.e. numEntriesToInsert = 100 results in 99 events from debezium 1.0.0, 300 results in 299 events.
        10 is handled ok.
        Likely this is related to https://issues.redhat.com/browse/DBZ-2288
        */
        this.numEntriesToInsert = 10;

        pulsarServiceUrl = "pulsar://pulsar-proxy:" + PulsarContainer.BROKER_PORT;

        sourceConfig.put("database.hostname", DebeziumPostgreSqlContainer.NAME);
        sourceConfig.put("database.port", "5432");
        sourceConfig.put("database.user", "postgres");
        sourceConfig.put("database.password", "postgres");
        sourceConfig.put("topic.prefix", "dbserver1");
        sourceConfig.put("database.dbname", "postgres");
        sourceConfig.put("schema.include.list", "inventory");
        sourceConfig.put("table.exclude.list", "inventory.spatial_ref_sys,inventory.geom");
        sourceConfig.put("schema.history.internal.pulsar.service.url", pulsarServiceUrl);
        sourceConfig.put("topic.namespace", "debezium/postgresql");
    }

    @Override
    public void setServiceContainer(DebeziumPostgreSqlContainer container) {
        log.info("start debezium postgresql server container.");
        debeziumPostgresqlContainer = container;
        pulsarCluster.startService(DebeziumPostgreSqlContainer.NAME, debeziumPostgresqlContainer);
    }

    @Override
    public void prepareSource() {
        log.info("debezium postgresql server already contains preconfigured data.");
    }

    @Override
    public void prepareInsertEvent() throws Exception {
        this.debeziumPostgresqlContainer.execCmd("/bin/bash", "-c",
                "psql -h 127.0.0.1 -U postgres -d postgres "
                        + "-c \"insert into inventory.products(name, description, weight) "
                        + "values('test-debezium', 'description', 10);\"");
        this.debeziumPostgresqlContainer.execCmd("/bin/bash", "-c",
                "psql -h 127.0.0.1 -U postgres -d postgres "
                        + "-c \"select count(1), "
                        + "max(id) from inventory.products where name='test-debezium' and weight=10;\"");
    }

    @Override
    public void prepareDeleteEvent() throws Exception {
        this.debeziumPostgresqlContainer.execCmd("/bin/bash", "-c",
                "psql -h 127.0.0.1 -U postgres -d postgres "
                       + "-c \"delete from inventory.products where name='test-debezium';\"");
        this.debeziumPostgresqlContainer.execCmd("/bin/bash", "-c",
                "psql -h 127.0.0.1 -U postgres -d postgres -c "
                        + "\"select count(1) from inventory.products where name='test-debezium';\"");
    }

    @Override
    public void prepareUpdateEvent() throws Exception {
        this.debeziumPostgresqlContainer.execCmd("/bin/bash", "-c",
                "psql -h 127.0.0.1 -U postgres -d postgres "
                        + "-c \"update inventory.products "
                        + "set description='test-update-description', weight='20' where name='test-debezium';\"");
        this.debeziumPostgresqlContainer.execCmd("/bin/bash", "-c",
                "psql -h 127.0.0.1 -U postgres -d postgres -c "
                        + "\"select count(1) from inventory.products where name='test-debezium' and weight=20;\"");
    }

    @Override
    public void doPostValidationCheck(String eventType) {
        super.doPostValidationCheck(eventType);
        /*
        confirmed_flush_lsn in pg_replication_slots table has to change,
        otherwise postgres won't truncate WAL and the disk space will grow.
        I.e. upgrade from debezium 1.0.0 to 1.0.3 resulted in confirmed_flush_lsn
        not updating in insert-heavy load.
        */
        try {
            ContainerExecResult res = debeziumPostgresqlContainer.execCmd("/bin/bash", "-c",
                    "psql -h 127.0.0.1 -U postgres -d postgres -c "
                            + "\"select confirmed_flush_lsn from pg_replication_slots;\"");
            res.assertNoStderr();
            String lastConfirmedFlushLsn = res.getStdout();
            log.info("Current confirmedFlushLsn: \n{} \nLast confirmedFlushLsn: \n{}",
                    confirmedFlushLsn.get(), lastConfirmedFlushLsn);
            Assert.assertNotEquals(confirmedFlushLsn.get(), lastConfirmedFlushLsn);
            confirmedFlushLsn.set(lastConfirmedFlushLsn);
        } catch (Exception e) {
            Assert.fail("failed to get flush lsn", e);
        }
    }

    @Override
    public Map<String, String> produceSourceMessages(int numMessages) {
        log.info("debezium postgresql server already contains preconfigured data.");
        return null;
    }

    @Override
    public void close() {
        if (pulsarCluster != null) {
            if (debeziumPostgresqlContainer != null) {
                PulsarCluster.stopService(DebeziumPostgreSqlContainer.NAME, debeziumPostgresqlContainer);
                debeziumPostgresqlContainer = null;
            }
        }
    }

}
