/*
 * 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.
 */
package org.apache.kafka.streams.tests;

import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.streams.KafkaStreams;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.StreamsConfig;
import org.apache.kafka.streams.kstream.KStream;
import org.apache.kafka.streams.processor.AbstractProcessor;
import org.apache.kafka.streams.processor.ProcessorContext;
import org.apache.kafka.streams.processor.ProcessorSupplier;

import java.util.Properties;

public class StreamsUpgradeTest {


    @SuppressWarnings("unchecked")
    public static void main(final String[] args) throws Exception {
        if (args.length < 2) {
            System.err.println("StreamsUpgradeTest requires three argument (kafka-url, properties-file) but only " + args.length + " provided: "
                + (args.length > 0 ? args[0] : ""));
        }
        final String kafka = args[0];
        final String propFileName = args.length > 1 ? args[1] : null;

        final Properties streamsProperties = Utils.loadProps(propFileName);

        System.out.println("StreamsTest instance started (StreamsUpgradeTest v2.1)");
        System.out.println("kafka=" + kafka);
        System.out.println("props=" + streamsProperties);

        final StreamsBuilder builder = new StreamsBuilder();
        final KStream dataStream = builder.stream("data");
        dataStream.process(printProcessorSupplier());
        dataStream.to("echo");

        final Properties config = new Properties();
        config.setProperty(StreamsConfig.APPLICATION_ID_CONFIG, "StreamsUpgradeTest");
        config.setProperty(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, kafka);
        config.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 1000);
        config.putAll(streamsProperties);

        final KafkaStreams streams = new KafkaStreams(builder.build(), config);
        streams.start();

        Runtime.getRuntime().addShutdownHook(new Thread(() -> {
            streams.close();
            System.out.println("UPGRADE-TEST-CLIENT-CLOSED");
            System.out.flush();
        }));
    }

    private static <K, V> ProcessorSupplier<K, V> printProcessorSupplier() {
        return () -> new AbstractProcessor<K, V>() {
            private int numRecordsProcessed = 0;

            @Override
            public void init(final ProcessorContext context) {
                System.out.println("initializing processor: topic=data taskId=" + context.taskId());
                numRecordsProcessed = 0;
            }

            @Override
            public void process(final K key, final V value) {
                numRecordsProcessed++;
                if (numRecordsProcessed % 100 == 0) {
                    System.out.println("processed " + numRecordsProcessed + " records from topic=data");
                }
            }

            @Override
            public void close() {}
        };
    }
}