/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
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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
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/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.cluster.metadata;

import org.opensearch.LegacyESVersion;
import org.opensearch.Version;
import org.opensearch.common.settings.IndexScopedSettings;
import org.opensearch.common.settings.Settings;
import org.opensearch.indices.SystemIndexDescriptor;
import org.opensearch.indices.SystemIndices;
import org.opensearch.indices.mapper.MapperRegistry;
import org.opensearch.plugins.MapperPlugin;
import org.opensearch.test.OpenSearchTestCase;
import org.opensearch.test.VersionUtils;

import java.util.Collections;

import static org.hamcrest.Matchers.equalTo;

public class MetadataIndexUpgradeServiceTests extends OpenSearchTestCase {

    public void testArchiveBrokenIndexSettings() {
        MetadataIndexUpgradeService service = getMetadataIndexUpgradeService();
        IndexMetadata src = newIndexMeta("foo", Settings.EMPTY);
        IndexMetadata indexMetadata = service.archiveBrokenIndexSettings(src);
        assertSame(indexMetadata, src);

        src = newIndexMeta("foo", Settings.builder().put("index.refresh_interval", "-200").build());
        indexMetadata = service.archiveBrokenIndexSettings(src);
        assertNotSame(indexMetadata, src);
        assertEquals("-200", indexMetadata.getSettings().get("archived.index.refresh_interval"));

        src = newIndexMeta("foo", Settings.builder().put("index.codec", "best_compression1").build());
        indexMetadata = service.archiveBrokenIndexSettings(src);
        assertNotSame(indexMetadata, src);
        assertEquals("best_compression1", indexMetadata.getSettings().get("archived.index.codec"));

        src = newIndexMeta("foo", Settings.builder().put("index.refresh.interval", "-1").build());
        indexMetadata = service.archiveBrokenIndexSettings(src);
        assertNotSame(indexMetadata, src);
        assertEquals("-1", indexMetadata.getSettings().get("archived.index.refresh.interval"));

        src = newIndexMeta("foo", indexMetadata.getSettings()); // double archive?
        indexMetadata = service.archiveBrokenIndexSettings(src);
        assertSame(indexMetadata, src);
    }

    public void testAlreadyUpgradedIndexArchivesBrokenIndexSettings() {
        final MetadataIndexUpgradeService service = getMetadataIndexUpgradeService();
        final IndexMetadata initial = newIndexMeta(
            "foo",
            Settings.builder().put(IndexMetadata.SETTING_VERSION_UPGRADED, Version.CURRENT).put("index.refresh_interval", "-200").build()
        );
        assertTrue(service.isUpgraded(initial));
        final IndexMetadata after = service.upgradeIndexMetadata(initial, Version.CURRENT.minimumIndexCompatibilityVersion());
        // the index does not need to be upgraded, but checking that it does should archive any broken settings
        assertThat(after.getSettings().get("archived.index.refresh_interval"), equalTo("-200"));
        assertNull(after.getSettings().get("index.refresh_interval"));
    }

    public void testUpgrade() {
        MetadataIndexUpgradeService service = getMetadataIndexUpgradeService();
        IndexMetadata src = newIndexMeta("foo", Settings.builder().put("index.refresh_interval", "-200").build());
        assertFalse(service.isUpgraded(src));
        src = service.upgradeIndexMetadata(src, Version.CURRENT.minimumIndexCompatibilityVersion());
        assertTrue(service.isUpgraded(src));
        assertEquals("-200", src.getSettings().get("archived.index.refresh_interval"));
        assertNull(src.getSettings().get("index.refresh_interval"));
        assertSame(src, service.upgradeIndexMetadata(src, Version.CURRENT.minimumIndexCompatibilityVersion())); // no double upgrade
    }

    public void testUpgradeCustomSimilarity() {
        MetadataIndexUpgradeService service = getMetadataIndexUpgradeService();
        IndexMetadata src = newIndexMeta(
            "foo",
            Settings.builder()
                .put("index.similarity.my_similarity.type", "DFR")
                .put("index.similarity.my_similarity.after_effect", "l")
                .build()
        );
        assertFalse(service.isUpgraded(src));
        src = service.upgradeIndexMetadata(src, Version.CURRENT.minimumIndexCompatibilityVersion());
        assertTrue(service.isUpgraded(src));
    }

    public void testIsUpgraded() {
        MetadataIndexUpgradeService service = getMetadataIndexUpgradeService();
        IndexMetadata src = newIndexMeta("foo", Settings.builder().put("index.refresh_interval", "-200").build());
        assertFalse(service.isUpgraded(src));
        Version version = VersionUtils.randomVersionBetween(random(), VersionUtils.getFirstVersion(), VersionUtils.getPreviousVersion());
        src = newIndexMeta("foo", Settings.builder().put(IndexMetadata.SETTING_VERSION_UPGRADED, version).build());
        assertFalse(service.isUpgraded(src));
        src = newIndexMeta("foo", Settings.builder().put(IndexMetadata.SETTING_VERSION_UPGRADED, Version.CURRENT).build());
        assertTrue(service.isUpgraded(src));
    }

    public void testFailUpgrade() {
        MetadataIndexUpgradeService service = getMetadataIndexUpgradeService();
        Version minCompat = Version.CURRENT.minimumIndexCompatibilityVersion();
        Version indexUpgraded = VersionUtils.randomVersionBetween(
            random(),
            minCompat,
            Version.max(minCompat, VersionUtils.getPreviousVersion(Version.CURRENT))
        );
        Version indexCreated = LegacyESVersion.fromString((minCompat.major - 1) + "." + randomInt(5) + "." + randomInt(5));
        final IndexMetadata metadata = newIndexMeta(
            "foo",
            Settings.builder()
                .put(IndexMetadata.SETTING_VERSION_UPGRADED, indexUpgraded)
                .put(IndexMetadata.SETTING_VERSION_CREATED, indexCreated)
                .build()
        );
        String message = expectThrows(
            IllegalStateException.class,
            () -> service.upgradeIndexMetadata(metadata, Version.CURRENT.minimumIndexCompatibilityVersion())
        ).getMessage();
        assertEquals(
            message,
            "The index [[foo/BOOM]] was created with version ["
                + indexCreated
                + "] "
                + "but the minimum compatible version is ["
                + minCompat
                + "]."
                + " It should be re-indexed in OpenSearch "
                + minCompat.major
                + ".x before upgrading to "
                + Version.CURRENT.toString()
                + "."
        );

        indexCreated = VersionUtils.randomVersionBetween(random(), minCompat, Version.CURRENT);
        indexUpgraded = VersionUtils.randomVersionBetween(random(), indexCreated, Version.CURRENT);
        IndexMetadata goodMeta = newIndexMeta(
            "foo",
            Settings.builder()
                .put(IndexMetadata.SETTING_VERSION_UPGRADED, indexUpgraded)
                .put(IndexMetadata.SETTING_VERSION_CREATED, indexCreated)
                .build()
        );
        service.upgradeIndexMetadata(goodMeta, Version.CURRENT.minimumIndexCompatibilityVersion());
    }

    public void testMaybeMarkAsSystemIndex() {
        MetadataIndexUpgradeService service = getMetadataIndexUpgradeService();
        IndexMetadata src = newIndexMeta("foo", Settings.EMPTY);
        assertFalse(src.isSystem());
        IndexMetadata indexMetadata = service.maybeMarkAsSystemIndex(src);
        assertSame(indexMetadata, src);

        src = newIndexMeta(".system", Settings.EMPTY);
        assertFalse(src.isSystem());
        indexMetadata = service.maybeMarkAsSystemIndex(src);
        assertNotSame(indexMetadata, src);
        assertTrue(indexMetadata.isSystem());

        // test with the whole upgrade
        assertFalse(src.isSystem());
        indexMetadata = service.upgradeIndexMetadata(src, Version.CURRENT.minimumIndexCompatibilityVersion());
        assertTrue(indexMetadata.isSystem());
    }

    private MetadataIndexUpgradeService getMetadataIndexUpgradeService() {
        return new MetadataIndexUpgradeService(
            Settings.EMPTY,
            xContentRegistry(),
            new MapperRegistry(Collections.emptyMap(), Collections.emptyMap(), MapperPlugin.NOOP_FIELD_FILTER),
            IndexScopedSettings.DEFAULT_SCOPED_SETTINGS,
            new SystemIndices(
                Collections.singletonMap("system-plugin", Collections.singletonList(new SystemIndexDescriptor(".system", "a system index")))
            ),
            null
        );
    }

    public static IndexMetadata newIndexMeta(String name, Settings indexSettings) {
        Settings build = Settings.builder()
            .put(IndexMetadata.SETTING_VERSION_CREATED, Version.CURRENT)
            .put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, 1)
            .put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, 1)
            .put(IndexMetadata.SETTING_CREATION_DATE, 1)
            .put(IndexMetadata.SETTING_INDEX_UUID, "BOOM")
            .put(IndexMetadata.SETTING_VERSION_UPGRADED, Version.CURRENT.minimumIndexCompatibilityVersion())
            .put(indexSettings)
            .build();
        return IndexMetadata.builder(name).settings(build).build();
    }

}