/*
 * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.search.aggregations.bucket.composite;

import org.elasticsearch.common.geo.GeoBoundingBoxTests;
import org.elasticsearch.script.Script;
import org.elasticsearch.search.aggregations.BaseAggregationTestCase;
import org.elasticsearch.search.aggregations.bucket.geogrid.GeoTileUtils;
import org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramInterval;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.sort.SortOrder;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.function.ToLongFunction;

public class CompositeAggregationBuilderTests extends BaseAggregationTestCase<CompositeAggregationBuilder> {
    private DateHistogramValuesSourceBuilder randomDateHistogramSourceBuilder() {
        DateHistogramValuesSourceBuilder histo = new DateHistogramValuesSourceBuilder(randomAlphaOfLengthBetween(5, 10));
        if (randomBoolean()) {
            histo.field(randomAlphaOfLengthBetween(1, 20));
        } else {
            histo.script(new Script(randomAlphaOfLengthBetween(10, 20)));
        }
        if (randomBoolean()) {
            histo.calendarInterval(
                randomFrom(DateHistogramInterval.days(1), DateHistogramInterval.minutes(1), DateHistogramInterval.weeks(1))
            );
        } else {
            histo.fixedInterval(
                randomFrom(
                    new DateHistogramInterval(randomNonNegativeLong() + "ms"),
                    DateHistogramInterval.days(10),
                    DateHistogramInterval.hours(10)
                )
            );
        }
        if (randomBoolean()) {
            histo.timeZone(randomZone());
        }
        if (randomBoolean()) {
            histo.missingBucket(true);
        }
        histo.missingOrder(randomFrom(MissingOrder.values()));
        return histo;
    }

    private GeoTileGridValuesSourceBuilder randomGeoTileGridValuesSourceBuilder() {
        GeoTileGridValuesSourceBuilder geoTile = new GeoTileGridValuesSourceBuilder(randomAlphaOfLengthBetween(5, 10));
        if (randomBoolean()) {
            geoTile.precision(randomIntBetween(0, GeoTileUtils.MAX_ZOOM));
        }
        if (randomBoolean()) {
            geoTile.geoBoundingBox(GeoBoundingBoxTests.randomBBox());
        }
        return geoTile;
    }

    private TermsValuesSourceBuilder randomTermsSourceBuilder() {
        TermsValuesSourceBuilder terms = new TermsValuesSourceBuilder(randomAlphaOfLengthBetween(5, 10));
        if (randomBoolean()) {
            terms.field(randomAlphaOfLengthBetween(1, 20));
        } else {
            terms.script(new Script(randomAlphaOfLengthBetween(10, 20)));
        }
        terms.order(randomFrom(SortOrder.values()));
        if (randomBoolean()) {
            terms.missingBucket(true);
        }
        terms.missingOrder(randomFrom(MissingOrder.values()));
        return terms;
    }

    private HistogramValuesSourceBuilder randomHistogramSourceBuilder() {
        HistogramValuesSourceBuilder histo = new HistogramValuesSourceBuilder(randomAlphaOfLengthBetween(5, 10));
        if (randomBoolean()) {
            histo.field(randomAlphaOfLengthBetween(1, 20));
        } else {
            histo.script(new Script(randomAlphaOfLengthBetween(10, 20)));
        }
        if (randomBoolean()) {
            histo.missingBucket(true);
        }
        histo.missingOrder(randomFrom(MissingOrder.values()));
        histo.interval(randomDoubleBetween(Math.nextUp(0), Double.MAX_VALUE, false));
        return histo;
    }

    @Override
    protected CompositeAggregationBuilder createTestAggregatorBuilder() {
        int numSources = randomIntBetween(1, 10);
        List<CompositeValuesSourceBuilder<?>> sources = new ArrayList<>();
        for (int i = 0; i < numSources; i++) {
            int type = randomIntBetween(0, 3);
            switch (type) {
                case 0 -> sources.add(randomTermsSourceBuilder());
                case 1 -> sources.add(randomDateHistogramSourceBuilder());
                case 2 -> sources.add(randomHistogramSourceBuilder());
                case 3 -> sources.add(randomGeoTileGridValuesSourceBuilder());
                default -> throw new AssertionError("wrong branch");
            }
        }
        return new CompositeAggregationBuilder(randomAlphaOfLength(10), sources);
    }

    public void testSupportsParallelCollection() {
        assertTrue(
            new CompositeAggregationBuilder(randomAlphaOfLength(10), Collections.singletonList(randomDateHistogramSourceBuilder()))
                .supportsParallelCollection(null)
        );
        assertTrue(
            new CompositeAggregationBuilder(randomAlphaOfLength(10), Collections.singletonList(randomHistogramSourceBuilder()))
                .supportsParallelCollection(null)
        );
        CompositeAggregationBuilder builder = new CompositeAggregationBuilder(
            randomAlphaOfLength(10),
            Collections.singletonList(randomGeoTileGridValuesSourceBuilder())
        );
        assertTrue(builder.supportsParallelCollection(null));
        builder.subAggregation(new TermsAggregationBuilder("name") {
            @Override
            public boolean supportsParallelCollection(ToLongFunction<String> fieldCardinalityResolver) {
                return false;
            }
        });
        assertFalse(builder.supportsParallelCollection(null));
        assertFalse(
            new CompositeAggregationBuilder(randomAlphaOfLength(10), Collections.singletonList(new TermsValuesSourceBuilder("name")))
                .supportsParallelCollection(field -> -1)
        );
        assertTrue(
            new CompositeAggregationBuilder(randomAlphaOfLength(10), Collections.singletonList(new TermsValuesSourceBuilder("name")))
                .supportsParallelCollection(field -> randomIntBetween(0, 50))
        );
        assertFalse(
            new CompositeAggregationBuilder(randomAlphaOfLength(10), Collections.singletonList(new TermsValuesSourceBuilder("name")))
                .supportsParallelCollection(field -> randomIntBetween(51, 100))
        );
        assertFalse(
            new CompositeAggregationBuilder(
                randomAlphaOfLength(10),
                Collections.singletonList(new TermsValuesSourceBuilder("name").script(new Script("id")))
            ).supportsParallelCollection(field -> randomIntBetween(-1, 100))
        );
        assertFalse(
            new CompositeAggregationBuilder(
                randomAlphaOfLength(10),
                List.of(randomDateHistogramSourceBuilder(), new TermsValuesSourceBuilder("name"))
            ).supportsParallelCollection(field -> randomIntBetween(51, 100))
        );
    }
}