/*
 * 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.sling.jcr.resource.internal;

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

import java.util.Collections;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.Workspace;
import javax.jcr.observation.Event;
import javax.jcr.observation.EventIterator;
import javax.jcr.observation.ObservationManager;

import org.apache.sling.api.resource.observation.ResourceChange;
import org.apache.sling.api.resource.observation.ResourceChange.ChangeType;
import org.apache.sling.api.resource.path.PathSet;
import org.apache.sling.jcr.api.SlingRepository;
import org.apache.sling.jcr.resource.internal.helper.jcr.SlingRepositoryProvider;
import org.apache.sling.spi.resource.provider.ObservationReporter;
import org.apache.sling.spi.resource.provider.ObserverConfiguration;
import org.apache.sling.spi.resource.provider.ProviderContext;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import org.osgi.framework.InvalidSyntaxException;

/**
 * This test case asserts that JcrResourceListener scales to an
 * arbitrary number of events.
 */
public class JcrResourceListenerScalabilityTest {

    private JcrListenerBaseConfig config;

    private JcrResourceListener jcrResourceListener;

    private EventIterator events;

    @SuppressWarnings("deprecation")
    @Before
    public void setUp() throws Exception {
        ObservationManager observationManager = mock(ObservationManager.class);

        Workspace workspace = mock(Workspace.class);
        when(workspace.getObservationManager()).thenReturn(observationManager);

        Session session = mock(Session.class);
        when(session.getWorkspace()).thenReturn(workspace);

        SlingRepository repository = mock(SlingRepository.class);
        when(repository.loginAdministrative(null)).thenReturn(session);

        final ProviderContext ctx = new SimpleProviderContext();
        this.config = new JcrListenerBaseConfig(ctx.getObservationReporter(),
                SlingRepositoryProvider.getRepository());
        jcrResourceListener = new JcrResourceListener(this.config, ctx.getObservationReporter().getObserverConfigurations().get(0));

        Event event = mock(MockEvent.class);
        events = mock(EventIterator.class);
        when(events.hasNext()).thenReturn(true);
        when(event.getPath()).thenCallRealMethod();
        when(event.getType()).thenReturn(Event.NODE_ADDED);
        when(events.nextEvent()).thenReturn(event);
    }

    @Ignore("SLING-3399")  // FIXME SLING-3399
    @Test
    public void testManyEvents() throws RepositoryException, InterruptedException, InvalidSyntaxException {
        jcrResourceListener.onEvent(events);
    }

    private abstract static class MockEvent implements Event {
        int count;

        @Override
        public String getPath() throws RepositoryException {
            return "path-" + count++;
        }
    }

    private static class SimpleProviderContext implements ProviderContext {
        @Override
        public ObservationReporter getObservationReporter() {
            return new ObservationReporter() {

                @Override
                public void reportChanges(Iterable<ResourceChange> changes, boolean distribute) {
                }

                @Override
                public void reportChanges(ObserverConfiguration config, Iterable<ResourceChange> changes,
                        boolean distribute) {
                }

                @Override
                public List<ObserverConfiguration> getObserverConfigurations() {
                    ObserverConfiguration config = new ObserverConfiguration() {

                        @Override
                        public boolean includeExternal() {
                            return true;
                        }

                        @Override
                        public PathSet getPaths() {
                            return PathSet.fromStrings("/");
                        }

                        @Override
                        public PathSet getExcludedPaths() {
                            return PathSet.fromPaths();
                        }

                        @Override
                        public Set<ChangeType> getChangeTypes() {
                            return EnumSet.allOf(ChangeType.class);
                        }

                        @Override
                        public boolean matches(String path) {
                            return true;
                        }

                        @Override
                        public Set<String> getPropertyNamesHint() {
                            return new HashSet<String>();
                        }
                    };
                    return Collections.singletonList(config);
                }
            };
        }

        @Override
        public PathSet getExcludedPaths() {
            return PathSet.fromPaths();
        }
    }
}