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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.metrics;

import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.search.aggregations.AggregationBuilder;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.support.AggregationContext;
import org.elasticsearch.search.aggregations.support.CoreValuesSourceType;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.aggregations.support.ValuesSourceRegistry;
import org.elasticsearch.search.aggregations.support.ValuesSourceType;
import org.elasticsearch.xcontent.ConstructingObjectParser;
import org.elasticsearch.xcontent.ParseField;
import org.elasticsearch.xcontent.XContentParser;

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

public class PercentileRanksAggregationBuilder extends AbstractPercentilesAggregationBuilder {
    public static final String NAME = PercentileRanks.TYPE_NAME;
    public static final ValuesSourceRegistry.RegistryKey REGISTRY_KEY =
        new ValuesSourceRegistry.RegistryKey<>(NAME, PercentilesAggregatorSupplier.class);

    private static final ParseField VALUES_FIELD = new ParseField("values");
    private static final ConstructingObjectParser PARSER;
    static {
        PARSER = AbstractPercentilesAggregationBuilder.createParser(
            PercentileRanksAggregationBuilder.NAME,
            PercentileRanksAggregationBuilder::new,
            PercentilesConfig.TDigest::new,
            VALUES_FIELD
        );
    }

    public static AggregationBuilder parse(String aggregationName, XContentParser parser) throws IOException {
        return PARSER.parse(parser, aggregationName);
    }

    public static void registerAggregators(ValuesSourceRegistry.Builder builder) {
        PercentileRanksAggregatorFactory.registerAggregators(builder);
    }

    public PercentileRanksAggregationBuilder(String name, double[] values) {
        this(name, values, null);
    }

    private PercentileRanksAggregationBuilder(String name, double[] values, PercentilesConfig percentilesConfig) {
        super(name, values, percentilesConfig, VALUES_FIELD);
    }

    public PercentileRanksAggregationBuilder(StreamInput in) throws IOException {
        super(VALUES_FIELD, in);
    }

    private PercentileRanksAggregationBuilder(
        PercentileRanksAggregationBuilder clone,
        AggregatorFactories.Builder factoriesBuilder,
        Map metadata
    ) {
        super(clone, factoriesBuilder, metadata);
    }

    @Override
    protected AggregationBuilder shallowCopy(AggregatorFactories.Builder factoriesBuilder, Map metadata) {
        return new PercentileRanksAggregationBuilder(this, factoriesBuilder, metadata);
    }

    @Override
    protected ValuesSourceType defaultValueSourceType() {
        return CoreValuesSourceType.NUMERIC;
    }

    /**
     * Get the values to compute percentiles from.
     */
    public double[] values() {
        return values;
    }

    @Override
    protected ValuesSourceAggregatorFactory innerBuild(
        AggregationContext context,
        ValuesSourceConfig config,
        AggregatorFactory parent,
        AggregatorFactories.Builder subFactoriesBuilder
    ) throws IOException {

        PercentilesAggregatorSupplier aggregatorSupplier = context.getValuesSourceRegistry().getAggregator(REGISTRY_KEY, config);

        return new PercentileRanksAggregatorFactory(
            name,
            config,
            values,
            configOrDefault(),
            keyed,
            context,
            parent,
            subFactoriesBuilder,
            metadata,
            aggregatorSupplier
        );
    }

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

    @Override
    protected ValuesSourceRegistry.RegistryKey getRegistryKey() {
        return REGISTRY_KEY;
    }
}