/*
 * 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.action.admin;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.cluster.node.hotthreads.NodeHotThreads;
import org.elasticsearch.action.admin.cluster.node.hotthreads.NodesHotThreadsRequestBuilder;
import org.elasticsearch.action.admin.cluster.node.hotthreads.NodesHotThreadsResponse;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.test.ElasticsearchIntegrationTest;
import org.junit.Test;

import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.atomic.AtomicBoolean;

import static org.elasticsearch.index.query.FilterBuilders.andFilter;
import static org.elasticsearch.index.query.FilterBuilders.notFilter;
import static org.elasticsearch.index.query.FilterBuilders.queryFilter;
import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
import static org.elasticsearch.index.query.QueryBuilders.termQuery;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.notNullValue;

/**
 */
public class HotThreadsTest extends ElasticsearchIntegrationTest {

    @Test
    public void testHotThreadsDontFail() throws ExecutionException, InterruptedException {
        /**
         * This test just checks if nothing crashes or gets stuck etc.
         */
        createIndex("test");
        final int iters = atLeast(2);
        final AtomicBoolean hasErrors = new AtomicBoolean(false);
        for (int i = 0; i < iters; i++) {
            final String type;
            NodesHotThreadsRequestBuilder nodesHotThreadsRequestBuilder = client().admin().cluster().prepareNodesHotThreads();
            if (randomBoolean()) {
                TimeValue timeValue = new TimeValue(rarely() ? randomIntBetween(500, 5000) : randomIntBetween(20, 500));
                nodesHotThreadsRequestBuilder.setInterval(timeValue);
            }
            if (randomBoolean()) {
                nodesHotThreadsRequestBuilder.setThreads(rarely() ? randomIntBetween(500, 5000) : randomIntBetween(1, 500));
            }
            if (randomBoolean()) {
                switch (randomIntBetween(0, 2)) {
                    case 2:
                        type = "cpu";
                        break;
                    case 1:
                        type = "wait";
                        break;
                    default:
                        type = "block";
                        break;
                }
                assertThat(type, notNullValue());
                nodesHotThreadsRequestBuilder.setType(type);
            } else {
                type = null;
            }
            final CountDownLatch latch = new CountDownLatch(1);
            nodesHotThreadsRequestBuilder.execute(new ActionListener<NodesHotThreadsResponse>() {
                @Override
                public void onResponse(NodesHotThreadsResponse nodeHotThreads) {
                    boolean success = false;
                    try {
                        assertThat(nodeHotThreads, notNullValue());
                        Map<String,NodeHotThreads> nodesMap = nodeHotThreads.getNodesMap();
                        assertThat(nodesMap.size(), equalTo(cluster().size()));
                        for (NodeHotThreads ht : nodeHotThreads) {
                            assertNotNull(ht.getHotThreads());
                            //logger.info(ht.getHotThreads());
                        }
                        success = true;
                    } finally {
                        if (!success) {
                            hasErrors.set(true);
                        }
                        latch.countDown();
                    }
                }

                @Override
                public void onFailure(Throwable e) {
                    logger.error("FAILED", e);
                    hasErrors.set(true);
                    latch.countDown();
                    fail();
                }
            });

            indexRandom(true,
                    client().prepareIndex("test", "type1", "1").setSource("field1", "value1"),
                    client().prepareIndex("test", "type1", "2").setSource("field1", "value2"),
                    client().prepareIndex("test", "type1", "3").setSource("field1", "value3"));
            ensureSearchable();
            while(latch.getCount() > 0) {
                assertHitCount(
                        client().prepareSearch()
                                .setQuery(matchAllQuery())
                                .setPostFilter(
                                        andFilter(
                                                queryFilter(matchAllQuery()),
                                                notFilter(andFilter(queryFilter(termQuery("field1", "value1")),
                                                        queryFilter(termQuery("field1", "value2")))))).get(),
                        3l);
            }
            latch.await();
            assertThat(hasErrors.get(), is(false));
        }
    }
}
