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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */
package org.elasticsearch.search.aggregations.bucket.terms;

import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.util.SetBackedScalingCuckooFilter;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.BucketOrder;
import org.elasticsearch.search.aggregations.InternalAggregations;
import org.elasticsearch.xcontent.XContentBuilder;

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

/**
 * Result of the RareTerms aggregation when the field is some kind of whole number like a integer, long, or a date.
 */
public class LongRareTerms extends InternalMappedRareTerms {
    public static final String NAME = "lrareterms";

    public static class Bucket extends InternalRareTerms.Bucket {
        long term;

        public Bucket(long term, long docCount, InternalAggregations aggregations, DocValueFormat format) {
            super(docCount, aggregations, format);
            this.term = term;
        }

        /**
         * Read from a stream.
         */
        public Bucket(StreamInput in, DocValueFormat format) throws IOException {
            super(in, format);
            term = in.readLong();
        }

        @Override
        protected void writeTermTo(StreamOutput out) throws IOException {
            out.writeLong(term);
        }

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

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

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

        @Override
        public int compareKey(Bucket other) {
            return Long.compare(term, other.term);
        }

        @Override
        protected final 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).toString());
            }
            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);
        }
    }

    LongRareTerms(
        String name,
        BucketOrder order,
        Map metadata,
        DocValueFormat format,
        List buckets,
        long maxDocCount,
        SetBackedScalingCuckooFilter filter
    ) {
        super(name, order, metadata, format, buckets, maxDocCount, filter);
    }

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

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

    @Override
    public LongRareTerms create(List buckets) {
        return new LongRareTerms(name, order, metadata, format, buckets, maxDocCount, filter);
    }

    @Override
    public LongRareTerms.Bucket createBucket(InternalAggregations aggregations, LongRareTerms.Bucket prototype) {
        return new LongRareTerms.Bucket(prototype.term, prototype.getDocCount(), aggregations, prototype.format);
    }

    @Override
    protected LongRareTerms createWithFilter(String name, List buckets, SetBackedScalingCuckooFilter filter) {
        return new LongRareTerms(name, order, getMetadata(), format, buckets, maxDocCount, filter);
    }

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

    @Override
    public boolean containsTerm(SetBackedScalingCuckooFilter filter, LongRareTerms.Bucket bucket) {
        return filter.mightContain((long) bucket.getKey());
    }

    @Override
    public void addToFilter(SetBackedScalingCuckooFilter filter, LongRareTerms.Bucket bucket) {
        filter.add((long) bucket.getKey());
    }

    @Override
    Bucket createBucket(long docCount, InternalAggregations aggs, LongRareTerms.Bucket prototype) {
        return new Bucket(prototype.term, docCount, aggs, format);
    }
}