/*
 * 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.maven.plugin.surefire.booterclient.output;

import javax.annotation.Nonnull;

import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.FutureTask;

import org.apache.maven.plugin.surefire.booterclient.output.ThreadedStreamConsumer.QueueSynchronizer;
import org.apache.maven.surefire.api.event.Event;
import org.apache.maven.surefire.api.event.StandardStreamOutWithNewLineEvent;
import org.apache.maven.surefire.extensions.EventHandler;
import org.junit.jupiter.api.Test;

import static java.util.concurrent.TimeUnit.SECONDS;
import static org.apache.maven.surefire.api.report.RunMode.NORMAL_RUN;
import static org.assertj.core.api.Assertions.assertThat;

/**
 *
 */
@SuppressWarnings("checkstyle:magicnumber")
public class ThreadedStreamConsumerTest {
    @Test
    public void testQueueSynchronizer() throws Exception {
        final CountDownLatch countDown = new CountDownLatch(5_000_000);
        final QueueSynchronizer<Integer> sync = new QueueSynchronizer<>(8 * 1024, null);

        Thread t = new Thread() {
            @Override
            public void run() {
                while (true) {
                    try {
                        sync.awaitNext();
                        countDown.countDown();
                    } catch (InterruptedException e) {
                        throw new IllegalStateException(e);
                    }
                }
            }
        };
        t.setDaemon(true);
        t.start();

        SECONDS.sleep(1);
        System.gc();
        SECONDS.sleep(2);

        long t1 = System.currentTimeMillis();

        for (int i = 0; i < 5_000_000; i++) {
            sync.pushNext(i);
        }

        assertThat(countDown.await(3L, SECONDS)).isTrue();

        long t2 = System.currentTimeMillis();
        System.out.println("spent " + (t2 - t1) + " ms in testQueueSynchronizer()");
    }

    @Test
    public void testThreadedStreamConsumer() throws Exception {
        final CountDownLatch countDown = new CountDownLatch(5_000_000);
        EventHandler<Event> handler = new EventHandler<Event>() {
            @Override
            public void handleEvent(@Nonnull Event event) {
                countDown.countDown();
            }
        };

        ThreadedStreamConsumer streamConsumer = new ThreadedStreamConsumer(handler);

        SECONDS.sleep(1);
        System.gc();
        SECONDS.sleep(2);

        long t1 = System.currentTimeMillis();

        Event event = new StandardStreamOutWithNewLineEvent(NORMAL_RUN, 1L, "", null);
        for (int i = 0; i < 5_000_000; i++) {
            streamConsumer.handleEvent(event);
        }

        assertThat(countDown.await(3L, SECONDS)).isTrue();

        long t2 = System.currentTimeMillis();
        System.out.println("spent " + (t2 - t1) + " ms in testThreadedStreamConsumer()");

        streamConsumer.close();
    }

    @Test
    public void testBasicStatus() throws Exception {
        final QueueSynchronizer<String> sync = new QueueSynchronizer<>(2, null);
        sync.pushNext("1");
        sync.pushNext("2");
        String s1 = sync.awaitNext();
        String s2 = sync.awaitNext();
        assertThat(s1).isEqualTo("1");
        assertThat(s2).isEqualTo("2");
        FutureTask<Void> future = new FutureTask<>(new Callable<Void>() {
            @Override
            public Void call() throws Exception {
                sync.awaitNext();
                return null;
            }
        });
        Thread t = new Thread(future);
        t.setDaemon(true);
        t.start();
        SECONDS.sleep(3L);
        assertThat(t.getState()).isEqualTo(Thread.State.WAITING);
    }
}
