/*
 * 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.threadpool;

import org.elasticsearch.Version;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.io.stream.BytesStreamOutput;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.SizeValue;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.test.ESTestCase;
import org.junit.Before;
import org.junit.Test;

import java.io.IOException;
import java.util.Map;

import static org.elasticsearch.common.settings.Settings.settingsBuilder;
import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
import static org.hamcrest.Matchers.*;

/**
 *
 */
public class ThreadPoolSerializationTests extends ESTestCase {

    BytesStreamOutput output = new BytesStreamOutput();
    private ThreadPool.ThreadPoolType threadPoolType;

    @Before
    public void setUp() throws Exception {
        super.setUp();
        threadPoolType = randomFrom(ThreadPool.ThreadPoolType.values());
    }

    @Test
    public void testThatQueueSizeSerializationWorks() throws Exception {
        ThreadPool.Info info = new ThreadPool.Info("foo", threadPoolType, 1, 10, TimeValue.timeValueMillis(3000), SizeValue.parseSizeValue("10k"));
        output.setVersion(Version.CURRENT);
        info.writeTo(output);

        StreamInput input = StreamInput.wrap(output.bytes());
        ThreadPool.Info newInfo = new ThreadPool.Info();
        newInfo.readFrom(input);

        assertThat(newInfo.getQueueSize().singles(), is(10000l));
    }

    @Test
    public void testThatNegativeQueueSizesCanBeSerialized() throws Exception {
        ThreadPool.Info info = new ThreadPool.Info("foo", threadPoolType, 1, 10, TimeValue.timeValueMillis(3000), null);
        output.setVersion(Version.CURRENT);
        info.writeTo(output);

        StreamInput input = StreamInput.wrap(output.bytes());
        ThreadPool.Info newInfo = new ThreadPool.Info();
        newInfo.readFrom(input);

        assertThat(newInfo.getQueueSize(), is(nullValue()));
    }

    @Test
    public void testThatToXContentWritesOutUnboundedCorrectly() throws Exception {
        ThreadPool.Info info = new ThreadPool.Info("foo", threadPoolType, 1, 10, TimeValue.timeValueMillis(3000), null);
        XContentBuilder builder = jsonBuilder();
        builder.startObject();
        info.toXContent(builder, ToXContent.EMPTY_PARAMS);
        builder.endObject();

        BytesReference bytesReference = builder.bytes();
        Map<String, Object> map;
        try (XContentParser parser = XContentFactory.xContent(bytesReference).createParser(bytesReference)) {
            map = parser.map();
        }
        assertThat(map, hasKey("foo"));
        map = (Map<String, Object>) map.get("foo");
        assertThat(map, hasKey("queue_size"));
        assertThat(map.get("queue_size").toString(), is("-1"));
    }

    @Test
    public void testThatNegativeSettingAllowsToStart() throws InterruptedException {
        Settings settings = settingsBuilder().put("name", "index").put("threadpool.index.queue_size", "-1").build();
        ThreadPool threadPool = new ThreadPool(settings);
        assertThat(threadPool.info("index").getQueueSize(), is(nullValue()));
        terminate(threadPool);
    }

    @Test
    public void testThatToXContentWritesInteger() throws Exception {
        ThreadPool.Info info = new ThreadPool.Info("foo", threadPoolType, 1, 10, TimeValue.timeValueMillis(3000), SizeValue.parseSizeValue("1k"));
        XContentBuilder builder = jsonBuilder();
        builder.startObject();
        info.toXContent(builder, ToXContent.EMPTY_PARAMS);
        builder.endObject();

        BytesReference bytesReference = builder.bytes();
        Map<String, Object> map;
        try (XContentParser parser = XContentFactory.xContent(bytesReference).createParser(bytesReference)) {
            map = parser.map();
        }
        assertThat(map, hasKey("foo"));
        map = (Map<String, Object>) map.get("foo");
        assertThat(map, hasKey("queue_size"));
        assertThat(map.get("queue_size").toString(), is("1000"));
    }

    public void testThatThreadPoolTypeIsSerializedCorrectly() throws IOException {
        ThreadPool.Info info = new ThreadPool.Info("foo", threadPoolType);
        output.setVersion(Version.CURRENT);
        info.writeTo(output);

        StreamInput input = StreamInput.wrap(output.bytes());
        ThreadPool.Info newInfo = new ThreadPool.Info();
        newInfo.readFrom(input);

        assertThat(newInfo.getThreadPoolType(), is(threadPoolType));
    }
}