/*
 * 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.pipeline;

import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.search.aggregations.AggregationExecutionException;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.InternalMultiBucketAggregation;
import org.elasticsearch.search.aggregations.bucket.MultiBucketsAggregation;
import org.elasticsearch.search.aggregations.metrics.InternalTDigestPercentiles;
import org.elasticsearch.test.ESTestCase;

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

import static org.hamcrest.Matchers.equalTo;
import static org.mockito.Mockito.mock;

public class BucketHelpersTests extends ESTestCase {

    public void testReturnsObjectArray() {

        MultiBucketsAggregation agg = new MultiBucketsAggregation() {
            @Override
            public List<? extends Bucket> getBuckets() {
                return null;
            }

            @Override
            public String getName() {
                return "foo";
            }

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

            @Override
            public Map<String, Object> getMetadata() {
                return null;
            }

            @Override
            public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
                return null;
            }
        };

        InternalMultiBucketAggregation.InternalBucket bucket = new InternalMultiBucketAggregation.InternalBucket() {
            @Override
            public void writeTo(StreamOutput out) throws IOException {

            }

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

            @Override
            public String getKeyAsString() {
                return null;
            }

            @Override
            public long getDocCount() {
                return 0;
            }

            @Override
            public Aggregations getAggregations() {
                return null;
            }

            @Override
            public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
                return null;
            }

            @Override
            public Object getProperty(String containingAggName, List<String> path) {
                return new Object[0];
            }
        };

        AggregationExecutionException e = expectThrows(AggregationExecutionException.class,
            () -> BucketHelpers.resolveBucketValue(agg, bucket, "foo>bar", BucketHelpers.GapPolicy.SKIP));

        assertThat(e.getMessage(), equalTo("buckets_path must reference either a number value or a single value numeric " +
            "metric aggregation, got: [Object[]] at aggregation [foo]"));
    }

    public void testReturnMultiValueObject() {

        MultiBucketsAggregation agg = new MultiBucketsAggregation() {
            @Override
            public List<? extends Bucket> getBuckets() {
                return null;
            }

            @Override
            public String getName() {
                return "foo";
            }

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

            @Override
            public Map<String, Object> getMetadata() {
                return null;
            }

            @Override
            public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
                return null;
            }
        };

        InternalMultiBucketAggregation.InternalBucket bucket = new InternalMultiBucketAggregation.InternalBucket() {
            @Override
            public void writeTo(StreamOutput out) throws IOException {

            }

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

            @Override
            public String getKeyAsString() {
                return null;
            }

            @Override
            public long getDocCount() {
                return 0;
            }

            @Override
            public Aggregations getAggregations() {
                return null;
            }

            @Override
            public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
                return null;
            }

            @Override
            public Object getProperty(String containingAggName, List<String> path) {
                return mock(InternalTDigestPercentiles.class);
            }
        };

        AggregationExecutionException e = expectThrows(AggregationExecutionException.class,
            () -> BucketHelpers.resolveBucketValue(agg, bucket, "foo>bar", BucketHelpers.GapPolicy.SKIP));

        assertThat(e.getMessage(), equalTo("buckets_path must reference either a number value or a single value numeric " +
            "metric aggregation, but [foo] contains multiple values. Please specify which to use."));
    }
}
