package org.eclipse.aether.named.hazelcast;

/*
 * 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.
 */

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.SyncContext;
import org.eclipse.aether.artifact.DefaultArtifact;
import org.eclipse.aether.internal.impl.synccontext.named.DiscriminatingNameMapper;
import org.eclipse.aether.internal.impl.synccontext.named.GAVNameMapper;
import org.eclipse.aether.internal.impl.synccontext.named.NamedLockFactoryAdapter;
import org.eclipse.aether.named.NamedLockFactory;
import org.eclipse.aether.repository.LocalRepository;
import org.eclipse.aether.spi.synccontext.SyncContextFactory;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

/**
 * UT support for {@link SyncContextFactory}.
 */
public abstract class NamedLockFactoryAdapterTestSupport
{
  private static final long ADAPTER_TIME = 100L;

  private static final TimeUnit ADAPTER_TIME_UNIT = TimeUnit.MILLISECONDS;

  /**
   * Subclass should populate this field, using {@link #setNamedLockFactory(NamedLockFactory)}, but subclass
   * must take care of proper cleanup as well, if needed!
   */
  private static NamedLockFactoryAdapter adapter;

  private RepositorySystemSession session;

  protected static void setNamedLockFactory(final NamedLockFactory namedLockFactory) {
    adapter = new NamedLockFactoryAdapter(
            new DiscriminatingNameMapper(new GAVNameMapper()), namedLockFactory, ADAPTER_TIME, ADAPTER_TIME_UNIT
    );
  }

  @AfterClass
  public static void cleanupAdapter() {
    if (adapter != null) {
      adapter.shutdown();
    }
  }

  @Before
  public void before() throws IOException {
    Files.createDirectories(Paths.get(System.getProperty("java.io.tmpdir"))); // hack for Surefire
    LocalRepository localRepository = new LocalRepository(Files.createTempDirectory("test").toFile());
    session = mock(RepositorySystemSession.class);
    when(session.getLocalRepository()).thenReturn(localRepository);
  }

  @Test
  public void justCreateAndClose() {
    adapter.newInstance(session, false).close();
  }

  @Test
  public void justAcquire() {
    try (SyncContext syncContext = adapter.newInstance(session, false)) {
      syncContext.acquire(
          Arrays.asList(new DefaultArtifact("groupId:artifactId:1.0"), new DefaultArtifact("groupId:artifactId:1.1")),
          null
      );
    }
  }

  @Test(timeout = 5000)
  public void sharedAccess() throws InterruptedException {
    CountDownLatch winners = new CountDownLatch(2); // we expect 2 winners
    CountDownLatch losers = new CountDownLatch(0); // we expect 0 losers
    Thread t1 = new Thread(new Access(true, winners, losers, adapter, session, null));
    Thread t2 = new Thread(new Access(true, winners, losers, adapter, session, null));
    t1.start();
    t2.start();
    t1.join();
    t2.join();
    winners.await();
    losers.await();
  }

  @Test(timeout = 5000)
  public void exclusiveAccess() throws InterruptedException {
    CountDownLatch winners = new CountDownLatch(1); // we expect 1 winner
    CountDownLatch losers = new CountDownLatch(1); // we expect 1 loser
    Thread t1 = new Thread(new Access(false, winners, losers, adapter, session, null));
    Thread t2 = new Thread(new Access(false, winners, losers, adapter, session, null));
    t1.start();
    t2.start();
    t1.join();
    t2.join();
    winners.await();
    losers.await();
  }

  @Test(timeout = 5000)
  public void mixedAccess() throws InterruptedException {
    CountDownLatch winners = new CountDownLatch(1); // we expect 1 winner
    CountDownLatch losers = new CountDownLatch(1); // we expect 1 loser
    Thread t1 = new Thread(new Access(true, winners, losers, adapter, session, null));
    Thread t2 = new Thread(new Access(false, winners, losers, adapter, session, null));
    t1.start();
    t2.start();
    t1.join();
    t2.join();
    winners.await();
    losers.await();
  }

  @Test(timeout = 5000)
  public void nestedSharedShared() throws InterruptedException {
    CountDownLatch winners = new CountDownLatch(2); // we expect 2 winners
    CountDownLatch losers = new CountDownLatch(0); // we expect 0 losers
    Thread t1 = new Thread(
            new Access(true, winners, losers, adapter, session,
                    new Access(true, winners, losers, adapter, session, null)
            )
    );
    t1.start();
    t1.join();
    winners.await();
    losers.await();
  }

  @Test(timeout = 5000)
  public void nestedExclusiveShared() throws InterruptedException {
    CountDownLatch winners = new CountDownLatch(2); // we expect 2 winners
    CountDownLatch losers = new CountDownLatch(0); // we expect 0 losers
    Thread t1 = new Thread(
            new Access(false, winners, losers, adapter, session,
                    new Access(true, winners, losers, adapter, session, null)
            )
    );
    t1.start();
    t1.join();
    winners.await();
    losers.await();
  }

  @Test(timeout = 5000)
  public void nestedExclusiveExclusive() throws InterruptedException {
    CountDownLatch winners = new CountDownLatch(2); // we expect 2 winners
    CountDownLatch losers = new CountDownLatch(0); // we expect 0 losers
    Thread t1 = new Thread(
            new Access(false, winners, losers, adapter, session,
                    new Access(false, winners, losers, adapter, session, null)
            )
    );
    t1.start();
    t1.join();
    winners.await();
    losers.await();
  }

  @Test(timeout = 5000)
  public void nestedSharedExclusive() throws InterruptedException {
    CountDownLatch winners = new CountDownLatch(1); // we expect 1 winner (outer)
    CountDownLatch losers = new CountDownLatch(1); // we expect 1 loser (inner)
    Thread t1 = new Thread(
            new Access(true, winners, losers, adapter, session,
                    new Access(false, winners, losers, adapter, session, null)
            )
    );
    t1.start();
    t1.join();
    winners.await();
    losers.await();
  }

  private static class Access implements Runnable {
    final boolean shared;
    final CountDownLatch winner;
    final CountDownLatch loser;
    final NamedLockFactoryAdapter adapter;
    final RepositorySystemSession session;
    final Access chained;

    public Access(boolean shared,
                  CountDownLatch winner,
                  CountDownLatch loser,
                  NamedLockFactoryAdapter adapter,
                  RepositorySystemSession session,
                  Access chained) {
      this.shared = shared;
      this.winner = winner;
      this.loser = loser;
      this.adapter = adapter;
      this.session = session;
      this.chained = chained;
    }

    @Override
    public void run() {
      try {
        try (SyncContext syncContext = adapter.newInstance(session, shared)) {
          syncContext.acquire(
                  Arrays.asList(new DefaultArtifact("groupId:artifactId:1.0"), new DefaultArtifact("groupId:artifactId:1.1")),
                  null
          );
          winner.countDown();
          if (chained != null) {
            chained.run();
          }
          loser.await();
        } catch (IllegalStateException e) {
          loser.countDown();
          winner.await();
        }
      }
      catch (InterruptedException e) {
        Assert.fail("interrupted");
      }
    }
  }
}
