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 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.
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package org.elasticsearch.action.admin.indices.settings.get;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.IndicesRequest;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.replication.ClusterStateCreationUtils;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.settings.IndexScopedSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.settings.SettingsFilter;
import org.elasticsearch.common.settings.SettingsModule;
import org.elasticsearch.index.Index;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.test.transport.CapturingTransport;
import org.elasticsearch.threadpool.TestThreadPool;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;
import org.junit.After;
import org.junit.Before;

import java.util.Collections;
import java.util.concurrent.TimeUnit;

import static java.util.Collections.emptyList;
import static java.util.Collections.emptySet;
import static org.elasticsearch.test.ClusterServiceUtils.createClusterService;

public class GetSettingsActionTests extends ESTestCase {

    private TransportService transportService;
    private ClusterService clusterService;
    private ThreadPool threadPool;
    private SettingsFilter settingsFilter;
    private final String indexName = "test_index";

    private TestTransportGetSettingsAction getSettingsAction;

    class TestTransportGetSettingsAction extends TransportGetSettingsAction {
        TestTransportGetSettingsAction() {
            super(GetSettingsActionTests.this.transportService, GetSettingsActionTests.this.clusterService,
                GetSettingsActionTests.this.threadPool, settingsFilter, new ActionFilters(Collections.emptySet()),
                new Resolver(), IndexScopedSettings.DEFAULT_SCOPED_SETTINGS);
        }
        @Override
        protected void masterOperation(GetSettingsRequest request, ClusterState state, ActionListener<GetSettingsResponse> listener) {
            ClusterState stateWithIndex = ClusterStateCreationUtils.state(indexName, 1, 1);
            super.masterOperation(request, stateWithIndex, listener);
        }
    }

    @Before
    public void setUp() throws Exception {
        super.setUp();

        settingsFilter = new SettingsModule(Settings.EMPTY, emptyList(), emptyList(), emptySet()).getSettingsFilter();
        threadPool = new TestThreadPool("GetSettingsActionTests");
        clusterService = createClusterService(threadPool);
        CapturingTransport capturingTransport = new CapturingTransport();
        transportService = capturingTransport.createCapturingTransportService(clusterService.getSettings(), threadPool,
            TransportService.NOOP_TRANSPORT_INTERCEPTOR,
            boundAddress -> clusterService.localNode(), null, Collections.emptySet());
        transportService.start();
        transportService.acceptIncomingRequests();
        getSettingsAction = new GetSettingsActionTests.TestTransportGetSettingsAction();
    }

    @After
    public void tearDown() throws Exception {
        ThreadPool.terminate(threadPool, 30, TimeUnit.SECONDS);
        threadPool = null;
        clusterService.close();
        super.tearDown();
    }

    public void testIncludeDefaults() {
        GetSettingsRequest noDefaultsRequest = new GetSettingsRequest().indices(indexName);
        getSettingsAction.execute(null, noDefaultsRequest, ActionListener.wrap(noDefaultsResponse -> {
            assertNull("index.refresh_interval should be null as it was never set", noDefaultsResponse.getSetting(indexName,
                "index.refresh_interval"));
        }, exception -> {
            throw new AssertionError(exception);
        }));

        GetSettingsRequest defaultsRequest = new GetSettingsRequest().indices(indexName).includeDefaults(true);

        getSettingsAction.execute(null, defaultsRequest, ActionListener.wrap(defaultsResponse -> {
            assertNotNull("index.refresh_interval should be set as we are including defaults", defaultsResponse.getSetting(indexName,
                "index.refresh_interval"));
        }, exception -> {
            throw new AssertionError(exception);
        }));

    }

    public void testIncludeDefaultsWithFiltering() {
        GetSettingsRequest defaultsRequest = new GetSettingsRequest().indices(indexName).includeDefaults(true)
            .names("index.refresh_interval");
        getSettingsAction.execute(null, defaultsRequest, ActionListener.wrap(defaultsResponse -> {
            assertNotNull("index.refresh_interval should be set as we are including defaults", defaultsResponse.getSetting(indexName,
                "index.refresh_interval"));
            assertNull("index.number_of_shards should be null as this query is filtered",
                defaultsResponse.getSetting(indexName, "index.number_of_shards"));
            assertNull("index.warmer.enabled should be null as this query is filtered",
                defaultsResponse.getSetting(indexName, "index.warmer.enabled"));
        }, exception -> {
            throw new AssertionError(exception);
        }));
    }

    static class Resolver extends IndexNameExpressionResolver {
        @Override
        public String[] concreteIndexNames(ClusterState state, IndicesRequest request) {
            return request.indices();
        }

        @Override
        public Index[] concreteIndices(ClusterState state, IndicesRequest request) {
            Index[] out = new Index[request.indices().length];
            for (int x = 0; x < out.length; x++) {
                out[x] = new Index(request.indices()[x], "_na_");
            }
            return out;
        }
    }
}
