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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.
 */

package org.elasticsearch.index.reindex;

import org.elasticsearch.action.admin.indices.create.CreateIndexRequestBuilder;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.join.ParentJoinPlugin;
import org.elasticsearch.plugins.Plugin;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import static org.elasticsearch.index.query.QueryBuilders.idsQuery;
import static org.elasticsearch.join.query.JoinQueryBuilders.hasParentQuery;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertSearchHits;
import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.hasToString;
import static org.hamcrest.Matchers.instanceOf;

/**
 * Index-by-search tests for parent/child.
 */
public class ReindexParentChildTests extends ReindexTestCase {
    QueryBuilder findsCountry;
    QueryBuilder findsCity;
    QueryBuilder findsNeighborhood;

    @Override
    protected boolean ignoreExternalCluster() {
        return true;
    }

    @Override
    protected Collection<Class<? extends Plugin>> nodePlugins() {
        final List<Class<? extends Plugin>> plugins = new ArrayList<>(super.nodePlugins());
        plugins.add(ParentJoinPlugin.class);
        return Collections.unmodifiableList(plugins);
    }

    @Override
    protected Collection<Class<? extends Plugin>> transportClientPlugins() {
        return nodePlugins();
    }

    public void testParentChild() throws Exception {
        createParentChildIndex("source");
        createParentChildIndex("dest");
        createParentChildDocs("source");

        // Copy parent to the new index
        ReindexRequestBuilder copy = reindex().source("source").destination("dest").filter(findsCountry).refresh(true);
        assertThat(copy.get(), matcher().created(1));

        // Copy the child to a new index
        copy = reindex().source("source").destination("dest").filter(findsCity).refresh(true);
        assertThat(copy.get(), matcher().created(1));

        // Make sure parent/child is intact on that index
        assertSearchHits(client().prepareSearch("dest").setQuery(findsCity).get(), "pittsburgh");

        // Copy the grandchild to a new index
        copy = reindex().source("source").destination("dest").filter(findsNeighborhood).refresh(true);
        assertThat(copy.get(), matcher().created(1));

        // Make sure parent/child is intact on that index
        assertSearchHits(client().prepareSearch("dest").setQuery(findsNeighborhood).get(),
                "make-believe");

        // Copy the parent/child/grandchild structure all at once to a third index
        createParentChildIndex("dest_all_at_once");
        copy = reindex().source("source").destination("dest_all_at_once").refresh(true);
        assertThat(copy.get(), matcher().created(3));

        // Make sure parent/child/grandchild is intact there too
        assertSearchHits(client().prepareSearch("dest_all_at_once").setQuery(findsNeighborhood).get(),
                "make-believe");
    }

    public void testErrorMessageWhenBadParentChild() throws Exception {
        createParentChildIndex("source");
        createParentChildDocs("source");

        ReindexRequestBuilder copy = reindex().source("source").destination("dest").filter(findsCity);
        final BulkByScrollResponse response = copy.get();
        assertThat(response.getBulkFailures().size(), equalTo(1));
        final Exception cause = response.getBulkFailures().get(0).getCause();
        assertThat(cause, instanceOf(IllegalArgumentException.class));
        assertThat(cause, hasToString(containsString("can't specify parent if no parent field has been configured")));
    }

    /**
     * Setup a parent/child index and return a query that should find the child
     * using the parent.
     */
    private void createParentChildIndex(String indexName) throws Exception {
        CreateIndexRequestBuilder create = client().admin().indices().prepareCreate(indexName);
        create.setSettings("index.mapping.single_type", false);
        create.addMapping("city", "{\"_parent\": {\"type\": \"country\"}}", XContentType.JSON);
        create.addMapping("neighborhood", "{\"_parent\": {\"type\": \"city\"}}", XContentType.JSON);
        assertAcked(create);
        ensureGreen();
    }

    private void createParentChildDocs(String indexName) throws Exception {
        indexRandom(true, client().prepareIndex(indexName, "country", "united states").setSource("foo", "bar"),
                client().prepareIndex(indexName, "city", "pittsburgh").setParent("united states").setSource("foo", "bar"),
                client().prepareIndex(indexName, "neighborhood", "make-believe").setParent("pittsburgh")
                        .setSource("foo", "bar").setRouting("united states"));

        findsCountry = idsQuery("country").addIds("united states");
        findsCity = hasParentQuery("country", findsCountry, false);
        findsNeighborhood = hasParentQuery("city", findsCity, false);

        // Make sure we built the parent/child relationship
        assertSearchHits(client().prepareSearch(indexName).setQuery(findsCity).get(), "pittsburgh");
        assertSearchHits(client().prepareSearch(indexName).setQuery(findsNeighborhood).get(), "make-believe");
    }
}