/*
 * 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
 * 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.
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/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.index.rankeval;

import org.opensearch.action.ActionRequest;
import org.opensearch.action.ActionResponse;
import org.opensearch.cluster.metadata.IndexNameExpressionResolver;
import org.opensearch.cluster.node.DiscoveryNodes;
import org.opensearch.core.common.io.stream.NamedWriteableRegistry;
import org.opensearch.common.settings.ClusterSettings;
import org.opensearch.common.settings.IndexScopedSettings;
import org.opensearch.common.settings.Settings;
import org.opensearch.common.settings.SettingsFilter;
import org.opensearch.core.xcontent.NamedXContentRegistry.Entry;
import org.opensearch.plugins.ActionPlugin;
import org.opensearch.plugins.Plugin;
import org.opensearch.rest.RestController;
import org.opensearch.rest.RestHandler;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.function.Supplier;

public class RankEvalModulePlugin extends Plugin implements ActionPlugin {

    @Override
    public List<ActionHandler<? extends ActionRequest, ? extends ActionResponse>> getActions() {
        return Arrays.asList(new ActionHandler<>(RankEvalAction.INSTANCE, TransportRankEvalAction.class));
    }

    @Override
    public List<RestHandler> getRestHandlers(
        Settings settings,
        RestController restController,
        ClusterSettings clusterSettings,
        IndexScopedSettings indexScopedSettings,
        SettingsFilter settingsFilter,
        IndexNameExpressionResolver indexNameExpressionResolver,
        Supplier<DiscoveryNodes> nodesInCluster
    ) {
        return Collections.singletonList(new RestRankEvalAction());
    }

    @Override
    public List<NamedWriteableRegistry.Entry> getNamedWriteables() {
        List<NamedWriteableRegistry.Entry> namedWriteables = new ArrayList<>();
        namedWriteables.add(new NamedWriteableRegistry.Entry(EvaluationMetric.class, PrecisionAtK.NAME, PrecisionAtK::new));
        namedWriteables.add(new NamedWriteableRegistry.Entry(EvaluationMetric.class, RecallAtK.NAME, RecallAtK::new));
        namedWriteables.add(new NamedWriteableRegistry.Entry(EvaluationMetric.class, MeanReciprocalRank.NAME, MeanReciprocalRank::new));
        namedWriteables.add(
            new NamedWriteableRegistry.Entry(EvaluationMetric.class, DiscountedCumulativeGain.NAME, DiscountedCumulativeGain::new)
        );
        namedWriteables.add(
            new NamedWriteableRegistry.Entry(EvaluationMetric.class, ExpectedReciprocalRank.NAME, ExpectedReciprocalRank::new)
        );
        namedWriteables.add(new NamedWriteableRegistry.Entry(MetricDetail.class, PrecisionAtK.NAME, PrecisionAtK.Detail::new));
        namedWriteables.add(new NamedWriteableRegistry.Entry(MetricDetail.class, RecallAtK.NAME, RecallAtK.Detail::new));
        namedWriteables.add(new NamedWriteableRegistry.Entry(MetricDetail.class, MeanReciprocalRank.NAME, MeanReciprocalRank.Detail::new));
        namedWriteables.add(
            new NamedWriteableRegistry.Entry(MetricDetail.class, DiscountedCumulativeGain.NAME, DiscountedCumulativeGain.Detail::new)
        );
        namedWriteables.add(
            new NamedWriteableRegistry.Entry(MetricDetail.class, ExpectedReciprocalRank.NAME, ExpectedReciprocalRank.Detail::new)
        );
        return namedWriteables;
    }

    @Override
    public List<Entry> getNamedXContent() {
        return new RankEvalNamedXContentProvider().getNamedXContentParsers();
    }
}