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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.
 */
package org.elasticsearch.search.aggregations.bucket.terms;

import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.InternalAggregations;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;

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

/**
 * Result of the {@link TermsAggregator} when the field is a String.
 */
public class StringTerms extends InternalMappedTerms {
    public static final String NAME = "sterms";
    public static class Bucket extends InternalTerms.Bucket {
        BytesRef termBytes;

        public Bucket(BytesRef term, long docCount, InternalAggregations aggregations, boolean showDocCountError, long docCountError,
                DocValueFormat format) {
            super(docCount, aggregations, showDocCountError, docCountError, format);
            this.termBytes = term;
        }

        /**
         * Read from a stream.
         */
        public Bucket(StreamInput in, DocValueFormat format, boolean showDocCountError) throws IOException {
            super(in, format, showDocCountError);
            termBytes = in.readBytesRef();
        }

        @Override
        protected void writeTermTo(StreamOutput out) throws IOException {
            out.writeBytesRef(termBytes);
        }

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

        @Override
        public Number getKeyAsNumber() {
            // this method is needed for scripted numeric aggs
            return Double.parseDouble(termBytes.utf8ToString());
        }

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

        @Override
        int compareTerm(Terms.Bucket other) {
            return termBytes.compareTo(((Bucket) other).termBytes);
        }

        @Override
        Bucket newBucket(long docCount, InternalAggregations aggs, long docCountError) {
            return new Bucket(termBytes, docCount, aggs, showDocCountError, docCountError, format);
        }

        @Override
        public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
            builder.startObject();
            builder.field(CommonFields.KEY, getKeyAsString());
            builder.field(CommonFields.DOC_COUNT, getDocCount());
            if (showDocCountError) {
                builder.field(InternalTerms.DOC_COUNT_ERROR_UPPER_BOUND_FIELD_NAME, getDocCountError());
            }
            aggregations.toXContentInternal(builder, params);
            builder.endObject();
            return builder;
        }
    }

    public StringTerms(String name, Terms.Order order, int requiredSize, long minDocCount, List pipelineAggregators,
            Map metaData, DocValueFormat format, int shardSize, boolean showTermDocCountError, long otherDocCount,
            List buckets, long docCountError) {
        super(name, order, requiredSize, minDocCount, pipelineAggregators, metaData, format,
                shardSize, showTermDocCountError, otherDocCount, buckets, docCountError);
    }

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

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

    @Override
    public StringTerms create(List buckets) {
        return new StringTerms(name, order, requiredSize, minDocCount, pipelineAggregators(), metaData, format, shardSize,
                showTermDocCountError, otherDocCount, buckets, docCountError);
    }

    @Override
    public Bucket createBucket(InternalAggregations aggregations, Bucket prototype) {
        return new Bucket(prototype.termBytes, prototype.docCount, aggregations, prototype.showDocCountError, prototype.docCountError,
                prototype.format);
    }

    @Override
    protected StringTerms create(String name, List buckets, long docCountError, long otherDocCount) {
        return new StringTerms(name, order, requiredSize, minDocCount, pipelineAggregators(), getMetaData(), format, shardSize,
                showTermDocCountError, otherDocCount, buckets, docCountError);
    }

    @Override
    public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
        builder.field(InternalTerms.DOC_COUNT_ERROR_UPPER_BOUND_FIELD_NAME, docCountError);
        builder.field(SUM_OF_OTHER_DOC_COUNTS, otherDocCount);
        builder.startArray(CommonFields.BUCKETS);
        for (Bucket bucket : buckets) {
            bucket.toXContent(builder, params);
        }
        builder.endArray();
        return builder;
    }

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