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 * 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
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package org.elasticsearch.index.engine;

import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.is;

import java.util.concurrent.TimeUnit;

import org.apache.lucene.index.LiveIndexWriterConfig;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.IndexService;
import org.elasticsearch.test.ESSingleNodeTestCase;

public class InternalEngineSettingsTests extends ESSingleNodeTestCase {

    public void testSettingsUpdate() {
        final IndexService service = createIndex("foo", Settings.builder().put(IndexMetaData.SETTING_VERSION_LESS_ENGINE, false).build());
        // INDEX_COMPOUND_ON_FLUSH
        InternalEngine engine = ((InternalEngine)engine(service));
        assertThat(engine.getCurrentIndexWriterConfig().getUseCompoundFile(), is(true));
        client().admin().indices().prepareUpdateSettings("foo").setSettings(Settings.builder().put(EngineConfig.INDEX_COMPOUND_ON_FLUSH, false).build()).get();
        assertThat(engine.getCurrentIndexWriterConfig().getUseCompoundFile(), is(false));
        client().admin().indices().prepareUpdateSettings("foo").setSettings(Settings.builder().put(EngineConfig.INDEX_COMPOUND_ON_FLUSH, true).build()).get();
        assertThat(engine.getCurrentIndexWriterConfig().getUseCompoundFile(), is(true));


        // VERSION MAP SIZE
        long indexBufferSize = engine.config().getIndexingBufferSize().bytes();
        long versionMapSize = engine.config().getVersionMapSize().bytes();
        assertThat(versionMapSize, equalTo((long) (indexBufferSize * 0.25)));

        final int iters = between(1, 20);
        for (int i = 0; i < iters; i++) {
            boolean compoundOnFlush = randomBoolean();

            // Tricky: TimeValue.parseTimeValue casts this long to a double, which steals 11 of the 64 bits for exponent, so we can't use
            // the full long range here else the assert below fails:
            long gcDeletes = random().nextLong() & (Long.MAX_VALUE >> 11);

            boolean versionMapAsPercent = randomBoolean();
            double versionMapPercent = randomIntBetween(0, 100);
            long versionMapSizeInMB = randomIntBetween(10, 20);
            String versionMapString = versionMapAsPercent ? versionMapPercent + "%" : versionMapSizeInMB + "mb";

            Settings build = Settings.builder()
                    .put(EngineConfig.INDEX_COMPOUND_ON_FLUSH, compoundOnFlush)
                    .put(EngineConfig.INDEX_GC_DELETES_SETTING, gcDeletes, TimeUnit.MILLISECONDS)
                    .put(EngineConfig.INDEX_VERSION_MAP_SIZE, versionMapString)
                    .build();
            assertEquals(gcDeletes, build.getAsTime(EngineConfig.INDEX_GC_DELETES_SETTING, null).millis());

            client().admin().indices().prepareUpdateSettings("foo").setSettings(build).get();
            LiveIndexWriterConfig currentIndexWriterConfig = engine.getCurrentIndexWriterConfig();
            assertEquals(engine.config().isCompoundOnFlush(), compoundOnFlush);
            assertEquals(currentIndexWriterConfig.getUseCompoundFile(), compoundOnFlush);


            assertEquals(engine.config().getGcDeletesInMillis(), gcDeletes);
            assertEquals(engine.getGcDeletesInMillis(), gcDeletes);

            indexBufferSize = engine.config().getIndexingBufferSize().bytes();
            versionMapSize = engine.config().getVersionMapSize().bytes();
            if (versionMapAsPercent) {
                assertThat(versionMapSize, equalTo((long) (indexBufferSize * (versionMapPercent / 100))));
            } else {
                assertThat(versionMapSize, equalTo(1024 * 1024 * versionMapSizeInMB));
            }
        }

        Settings settings = Settings.builder()
                .put(EngineConfig.INDEX_GC_DELETES_SETTING, 1000, TimeUnit.MILLISECONDS)
                .build();
        client().admin().indices().prepareUpdateSettings("foo").setSettings(settings).get();
        assertEquals(engine.getGcDeletesInMillis(), 1000);
        assertTrue(engine.config().isEnableGcDeletes());


        settings = Settings.builder()
                .put(EngineConfig.INDEX_GC_DELETES_SETTING, "0ms")
                .build();

        client().admin().indices().prepareUpdateSettings("foo").setSettings(settings).get();
        assertEquals(engine.getGcDeletesInMillis(), 0);
        assertTrue(engine.config().isEnableGcDeletes());

        settings = Settings.builder()
                .put(EngineConfig.INDEX_GC_DELETES_SETTING, 1000, TimeUnit.MILLISECONDS)
                .build();
        client().admin().indices().prepareUpdateSettings("foo").setSettings(settings).get();
        assertEquals(engine.getGcDeletesInMillis(), 1000);
        assertTrue(engine.config().isEnableGcDeletes());

        settings = Settings.builder()
                .put(EngineConfig.INDEX_VERSION_MAP_SIZE, "sdfasfd")
                .build();
        try {
            client().admin().indices().prepareUpdateSettings("foo").setSettings(settings).get();
            fail("settings update didn't fail, but should have");
        } catch (IllegalArgumentException e) {
            // good
        }

        settings = Settings.builder()
                .put(EngineConfig.INDEX_VERSION_MAP_SIZE, "-12%")
                .build();
        try {
            client().admin().indices().prepareUpdateSettings("foo").setSettings(settings).get();
            fail("settings update didn't fail, but should have");
        } catch (IllegalArgumentException e) {
            // good
        }

        settings = Settings.builder()
                .put(EngineConfig.INDEX_VERSION_MAP_SIZE, "130%")
                .build();
        try {
            client().admin().indices().prepareUpdateSettings("foo").setSettings(settings).get();
            fail("settings update didn't fail, but should have");
        } catch (IllegalArgumentException e) {
            // good
        }
    }


}