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 * 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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package org.elasticsearch.index.rankeval;

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

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

public class RankEvalPlugin 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 Arrays.asList(new RestRankEvalAction(settings, restController));
    }

    @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, 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, 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();
    }
}
