// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed 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 com.google.enterprise.adaptor;

import static org.junit.Assert.*;

import org.junit.*;
import org.junit.rules.ExpectedException;

import java.io.IOException;
import java.nio.charset.Charset;
import java.util.*;
import java.util.AbstractMap.SimpleImmutableEntry;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Test cases for {@link DocIdSender}.
 */
public class DocIdSenderTest {
  private MockGsaFeedFileMaker fileMaker = new MockGsaFeedFileMaker();
  private MockGsaFeedFileSender fileSender = new MockGsaFeedFileSender();
  private Journal journal = new Journal(new MockTimeProvider());
  private Config config = new Config();
  private DocIdsMockAdaptor adaptor = new DocIdsMockAdaptor();
  private DocIdSender docIdSender
      = new DocIdSender(fileMaker, fileSender, journal, config, adaptor);
  private ExceptionHandler runtimeExceptionHandler
      = new RuntimeExceptionExceptionHandler();

  @Rule
  public ExpectedException thrown = ExpectedException.none();

  @Before
  public void setup() {
    config.setValue("gsa.hostname", "localhost");
  }

  @Test
  public void testPushDocIdsFromAdaptorNormal() throws Exception {
    adaptor.pushItems = new ArrayList<List<DocIdPusher.Record>>();
    DocIdPusher.Record[] records = new DocIdPusher.Record[6];
    for (int i = 0; i < records.length; i++) {
      DocId id = new DocId("test" + i);
      records[i] = new DocIdPusher.Record.Builder(id).build();
    }
    List<DocIdPusher.Record> infos = new ArrayList<DocIdPusher.Record>();
    infos.add(records[0]);
    infos.add(records[1]);
    infos.add(records[2]);
    infos.add(records[3]);
    infos.add(records[4]);
    adaptor.pushItems.add(infos);
    infos = new ArrayList<DocIdPusher.Record>();
    infos.add(records[5]);
    adaptor.pushItems.add(infos);
    config.setValue("feed.maxUrls", "2");
    config.setValue("feed.name", "testing");

    docIdSender.pushFullDocIdsFromAdaptor(runtimeExceptionHandler);
    assertEquals(4, fileMaker.i);
    assertEquals(Arrays.asList(new String[] {
      "testing", "testing", "testing", "testing",
    }), fileMaker.names);
    assertEquals(Arrays.asList(new List[] {
      Arrays.asList(new DocIdPusher.Record[] {records[0], records[1]}),
      Arrays.asList(new DocIdPusher.Record[] {records[2], records[3]}),
      Arrays.asList(new DocIdPusher.Record[] {records[4]}),
      Arrays.asList(new DocIdPusher.Record[] {records[5]}),
    }), fileMaker.recordses);

    assertEquals(Arrays.asList(new String[] {
      "testing", "testing", "testing", "testing",
    }), fileSender.datasources);
    assertEquals(Arrays.asList(new String[] {
      "0", "1", "2", "3",
    }), fileSender.xmlStrings);
  }

  @Test
  public void testPushDocIdsNoHandler() throws Exception {
    // Don't send anything.
    adaptor.pushItems = new ArrayList<List<DocIdPusher.Record>>();
    thrown.expect(NullPointerException.class);
    docIdSender.pushFullDocIdsFromAdaptor(null);
  }
  
  @Test
  public void testPushDocIdsIterrupted() throws Exception {
    MockAdaptor adaptor = new MockAdaptor() {
      @Override
      public void getDocIds(DocIdPusher pusher) throws InterruptedException {
        throw new InterruptedException();
      }
    };
    docIdSender = new DocIdSender(fileMaker, fileSender, journal, config,
                                  adaptor);
    thrown.expect(InterruptedException.class);
    docIdSender.pushFullDocIdsFromAdaptor(runtimeExceptionHandler);
  }

  @Test
  public void testPushDocIdsFailure() throws Exception {
    class FailureAdaptor extends MockAdaptor {
      private int times;

      @Override
      public void getDocIds(DocIdPusher pusher) throws IOException {
        times++;
        throw new IOException();
      }
    }

    class TryTwiceExceptionHandler implements ExceptionHandler {
      @Override
      public boolean handleException(Exception ex, int ntries) {
        return ntries < 2;
      }
    }

    FailureAdaptor adaptor = new FailureAdaptor();
    ExceptionHandler errorHandler = new TryTwiceExceptionHandler();
    docIdSender = new DocIdSender(fileMaker, fileSender, journal, config,
                                  adaptor);
    docIdSender.pushFullDocIdsFromAdaptor(errorHandler);
    assertEquals(2, adaptor.times);
  }

  @Test
  public void testPushSizedBatchFailed() throws Exception {
    fileSender = new MockGsaFeedFileSender() {
      @Override
      public void sendMetadataAndUrl(String datasource,
                                     String xmlString, boolean useCompression)
          throws IOException {
        throw new IOException();
      }
    };
    docIdSender = new DocIdSender(fileMaker, fileSender, journal, config,
                                  adaptor);
    List<DocId> ids = Arrays.asList(new DocId[] {new DocId("test")});
    NeverRetryExceptionHandler errorHandler = new NeverRetryExceptionHandler();

    docIdSender.pushDocIds(ids, errorHandler);
    assertEquals(1, errorHandler.failed);
  }

  public void testPushSizedBatchRetrying() throws Exception {
    fileSender = new MockGsaFeedFileSender() {
      @Override
      public void sendMetadataAndUrl(String datasource,
                                     String xmlString, boolean useCompression)
          throws IOException {
        throw new IOException();
      }
    };
    docIdSender = new DocIdSender(fileMaker, fileSender, journal, config,
                                  adaptor);
    List<DocId> ids = Arrays.asList(new DocId[] {new DocId("test")});
    NeverRetryExceptionHandler errorHandler = new NeverRetryExceptionHandler() {
      @Override
      public boolean handleException(Exception ex, int ntries) {
        super.handleException(ex, ntries);
        return ntries < 2;
      }
    };

    docIdSender.pushDocIds(ids, errorHandler);
    assertEquals(2, errorHandler.failed);
  }

  @Test
  public void testPushInterruptedFirstBatch() throws Exception {
    fileSender = new MockGsaFeedFileSender() {
      @Override
      public void sendMetadataAndUrl(String datasource,
                                     String xmlString, boolean useCompression)
          throws IOException {
        throw new IOException();
      }
    };
    docIdSender = new DocIdSender(fileMaker, fileSender, journal, config,
                                  adaptor);
    List<DocId> ids = Arrays.asList(new DocId("test"), new DocId("test2"));

    Thread.currentThread().interrupt();
    thrown.expect(InterruptedException.class);
    docIdSender.pushDocIds(ids);
  }

  @Test
  public void testPushInterruptedLaterBatch() throws Exception {
    final AtomicLong batchCount = new AtomicLong();
    fileSender = new MockGsaFeedFileSender() {
      @Override
      public void sendMetadataAndUrl(String datasource,
                                     String xmlString, boolean useCompression)
          throws IOException {
        long count = batchCount.incrementAndGet();
        if (count >= 2) {
          throw new IOException();
        }
      }
    };
    config.setValue("feed.maxUrls", "1");
    docIdSender = new DocIdSender(fileMaker, fileSender, journal, config,
                                  adaptor);
    List<DocId> ids = Arrays.asList(new DocId("test"), new DocId("test2"));

    Thread.currentThread().interrupt();
    assertEquals(new DocId("test2"), docIdSender.pushDocIds(ids));
    assertTrue(Thread.currentThread().isInterrupted());
  }

  @Test
  public void testPushGroupsNormal() throws Exception {
    // Order of iteration matters
    Map<GroupPrincipal, Collection<Principal>> groups
        = new TreeMap<GroupPrincipal, Collection<Principal>>();
    groups.put(new GroupPrincipal("g1"),
        Arrays.asList(new UserPrincipal("u1"), new GroupPrincipal("g2")));
    groups.put(new GroupPrincipal("g2"),
        Arrays.asList(new UserPrincipal("u2"), new GroupPrincipal("g3")));
    groups.put(new GroupPrincipal("g3"),
        Arrays.asList(new UserPrincipal("u3"), new GroupPrincipal("g4")));
    groups = Collections.unmodifiableMap(groups);

    // I'm sorry.
    List<List<Map.Entry<GroupPrincipal, Collection<Principal>>>> goldenGroups
        = new ArrayList<List<Map.Entry<GroupPrincipal,
          Collection<Principal>>>>();
    {
      List<Map.Entry<GroupPrincipal, Collection<Principal>>> tmp
          = new ArrayList<Map.Entry<GroupPrincipal, Collection<Principal>>>();
      tmp.add(new SimpleImmutableEntry<GroupPrincipal, Collection<Principal>>(
          new GroupPrincipal("g1"), groups.get(new GroupPrincipal("g1"))));
      tmp.add(new SimpleImmutableEntry<GroupPrincipal, Collection<Principal>>(
          new GroupPrincipal("g2"), groups.get(new GroupPrincipal("g2"))));
      goldenGroups.add(Collections.unmodifiableList(tmp));
      goldenGroups.add(Collections.
          <Map.Entry<GroupPrincipal, Collection<Principal>>>singletonList(
          new SimpleImmutableEntry<GroupPrincipal, Collection<Principal>>(
            new GroupPrincipal("g3"), groups.get(new GroupPrincipal("g3")))));
      goldenGroups = Collections.unmodifiableList(goldenGroups);
    }

    config.setValue("feed.maxUrls", "2");
    docIdSender.pushGroupDefinitions(groups, false, null);

    assertEquals(2, fileMaker.i);
    assertEquals(goldenGroups, fileMaker.groupses);
    assertEquals(Arrays.asList(new String[] {
      "0", "1",
    }), fileSender.xmlStrings);
  }

  @Test
  public void testNamedResources() throws Exception {
    config.setValue("feed.name", "testing");
    assertNull(docIdSender.pushNamedResources(
        Collections.singletonMap(new DocId("test"), Acl.EMPTY),
        new NeverRetryExceptionHandler()));
  }

  @Test
  public void testNamedResourcesFailed() throws Exception {
    fileSender = new MockGsaFeedFileSender() {
      @Override
      public void sendMetadataAndUrl(String datasource,
                                     String xmlString, boolean useCompression)
          throws IOException {
        throw new IOException();
      }
    };
    docIdSender = new DocIdSender(fileMaker, fileSender, journal, config,
                                  adaptor);

    Map<DocId, Acl> resources = new TreeMap<DocId, Acl>();
    resources.put(new DocId("aaa"), Acl.EMPTY);
    resources.put(new DocId("bbb"), Acl.EMPTY);
    assertEquals(new DocId("aaa"), docIdSender.pushNamedResources(resources,
        new NeverRetryExceptionHandler()));
  }

  @Test
  public void testNullNamedResource() throws Exception {
    thrown.expect(NullPointerException.class);
    docIdSender.pushNamedResources(
        Collections.singletonMap(new DocId("test"), (Acl) null));
  }

  @Test
  public void testNullNamedResourceAcl() throws Exception {
    thrown.expect(NullPointerException.class);
    docIdSender.pushNamedResources(
        Collections.singletonMap((DocId) null, Acl.EMPTY));
  }

  private static class MockGsaFeedFileMaker extends GsaFeedFileMaker {
    List<String> names = new ArrayList<String>();
    List<List<? extends DocIdSender.Item>> recordses
        = new ArrayList<List<? extends DocIdSender.Item>>();
    // Don't use generics because of limitations in Java
    List<Object> groupses = new ArrayList<Object>();
    int i;

    public MockGsaFeedFileMaker() {
      super(null, new AclTransform(Arrays.<AclTransform.Rule>asList()));
    }

    @Override
    public String makeMetadataAndUrlXml(String name,
        List<? extends DocIdSender.Item> items) {
      names.add(name);
      recordses.add(items);
      return "" + i++;
    }

    @Override
    public <T extends Collection<Principal>> String makeGroupsDefinitionsXml(
        Collection<Map.Entry<GroupPrincipal, T>> items,
        boolean caseSensitiveMembers) {
      groupses.add(new ArrayList<Map.Entry<GroupPrincipal, T>>(items));
      return "" + i++;
    }
  }

  private static class MockGsaFeedFileSender extends GsaFeedFileSender {
    List<String> datasources = new ArrayList<String>();
    List<String> groupsources = new ArrayList<String>();
    List<String> xmlStrings = new ArrayList<String>();

    public MockGsaFeedFileSender() {
      super("localhost", /*secure=*/ false, Charset.forName("UTF-8"));
    }

    @Override
    public void sendMetadataAndUrl(String datasource,
                                   String xmlString, boolean useCompression)
        throws IOException {
      datasources.add(datasource);
      xmlStrings.add(xmlString);
    }

    @Override
    public void sendGroups(String groupsource, String xmlString,
        boolean useCompression) throws IOException {
      groupsources.add(groupsource);
      xmlStrings.add(xmlString);
    }
  }

  private static class RuntimeExceptionExceptionHandler
      implements ExceptionHandler {
    @Override
    public boolean handleException(Exception ex, int ntries) {
      throw new TriggeredException(ex);
    }

    public static class TriggeredException extends RuntimeException {
      public TriggeredException(Throwable cause) {
        super(cause);
      }
    }
  }

  private static class NeverRetryExceptionHandler implements ExceptionHandler {
    private int failed;

    @Override
    public boolean handleException(Exception ex, int ntries) {
      failed++;
      return false;
    }
  }

  private static class DocIdsMockAdaptor extends MockAdaptor {
    public List<List<DocIdPusher.Record>> pushItems;
    public int timesGetDocIdsCalled;

    /**
     * Throws a {@link NullPointerException} unless {@link #pushItems} has been
     * set.
     */
    @Override
    public void getDocIds(DocIdPusher pusher) throws InterruptedException,
        IOException {
      timesGetDocIdsCalled++;
      for (List<DocIdPusher.Record> infos : pushItems) {
        pusher.pushRecords(infos);
      }
    }
  }
}