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

package org.opensearch.search.aggregations.bucket.terms;

import org.opensearch.core.common.io.stream.StreamInput;
import org.opensearch.core.common.io.stream.StreamOutput;
import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.search.DocValueFormat;
import org.opensearch.search.aggregations.InternalAggregations;
import org.opensearch.search.aggregations.bucket.terms.heuristic.SignificanceHeuristic;

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

/**
 * Result of the running the significant terms aggregation on a numeric field.
 *
 * @opensearch.internal
 */
public class SignificantLongTerms extends InternalMappedSignificantTerms {
    public static final String NAME = "siglterms";

    /**
     * Bucket for significant long values
     *
     * @opensearch.internal
     */
    static class Bucket extends InternalSignificantTerms.Bucket {

        long term;

        Bucket(
            long subsetDf,
            long subsetSize,
            long supersetDf,
            long supersetSize,
            long term,
            InternalAggregations aggregations,
            DocValueFormat format,
            double score
        ) {
            super(subsetDf, subsetSize, supersetDf, supersetSize, aggregations, format);
            this.term = term;
            this.score = score;
        }

        Bucket(StreamInput in, long subsetSize, long supersetSize, DocValueFormat format) throws IOException {
            super(in, subsetSize, supersetSize, format);
            subsetDf = in.readVLong();
            supersetDf = in.readVLong();
            term = in.readLong();
            score = in.readDouble();
            aggregations = InternalAggregations.readFrom(in);
        }

        @Override
        public void writeTo(StreamOutput out) throws IOException {
            out.writeVLong(subsetDf);
            out.writeVLong(supersetDf);
            out.writeLong(term);
            out.writeDouble(getSignificanceScore());
            aggregations.writeTo(out);
        }

        @Override
        public Object getKey() {
            return term;
        }

        @Override
        public String getKeyAsString() {
            return format.format(term).toString();
        }

        @Override
        public Number getKeyAsNumber() {
            return term;
        }

        @Override
        protected XContentBuilder keyToXContent(XContentBuilder builder) throws IOException {
            builder.field(CommonFields.KEY.getPreferredName(), term);
            if (format != DocValueFormat.RAW) {
                builder.field(CommonFields.KEY_AS_STRING.getPreferredName(), format.format(term));
            }
            return builder;
        }

        @Override
        public boolean equals(Object obj) {
            return super.equals(obj) && Objects.equals(term, ((Bucket) obj).term);
        }

        @Override
        public int hashCode() {
            return Objects.hash(super.hashCode(), term);
        }
    }

    public SignificantLongTerms(
        String name,
        Map metadata,
        DocValueFormat format,
        long subsetSize,
        long supersetSize,
        SignificanceHeuristic significanceHeuristic,
        List buckets,
        TermsAggregator.BucketCountThresholds bucketCountThresholds
    ) {
        super(name, metadata, format, subsetSize, supersetSize, significanceHeuristic, buckets, bucketCountThresholds);
    }

    /**
     * Read from a stream.
     */
    public SignificantLongTerms(StreamInput in) throws IOException {
        super(in, Bucket::new);
    }

    @Override
    public String getWriteableName() {
        return NAME;
    }

    @Override
    public SignificantLongTerms create(List buckets) {
        return new SignificantLongTerms(
            name,
            metadata,
            format,
            subsetSize,
            supersetSize,
            significanceHeuristic,
            buckets,
            bucketCountThresholds
        );
    }

    @Override
    public Bucket createBucket(InternalAggregations aggregations, SignificantLongTerms.Bucket prototype) {
        return new Bucket(
            prototype.subsetDf,
            prototype.subsetSize,
            prototype.supersetDf,
            prototype.supersetSize,
            prototype.term,
            aggregations,
            prototype.format,
            prototype.score
        );
    }

    @Override
    protected SignificantLongTerms create(long subsetSize, long supersetSize, List buckets) {
        return new SignificantLongTerms(
            getName(),
            getMetadata(),
            format,
            subsetSize,
            supersetSize,
            significanceHeuristic,
            buckets,
            bucketCountThresholds
        );
    }

    @Override
    protected Bucket[] createBucketsArray(int size) {
        return new Bucket[size];
    }

    @Override
    Bucket createBucket(
        long subsetDf,
        long subsetSize,
        long supersetDf,
        long supersetSize,
        InternalAggregations aggregations,
        SignificantLongTerms.Bucket prototype
    ) {
        return new Bucket(subsetDf, subsetSize, supersetDf, supersetSize, prototype.term, aggregations, format, prototype.score);
    }
}