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 * 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
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package org.elasticsearch.search.aggregations.pipeline;

import org.elasticsearch.search.aggregations.AggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.global.GlobalAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.aggregations.support.ValueType;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

public class AvgBucketTests extends AbstractBucketMetricsTestCase<AvgBucketPipelineAggregationBuilder> {

    @Override
    protected AvgBucketPipelineAggregationBuilder doCreateTestAggregatorFactory(String name, String bucketsPath) {
        return new AvgBucketPipelineAggregationBuilder(name, bucketsPath);
    }

    public void testValidate() {
        AggregationBuilder singleBucketAgg = new GlobalAggregationBuilder("global");
        AggregationBuilder multiBucketAgg = new TermsAggregationBuilder("terms", ValueType.STRING);
        final Set<AggregationBuilder> aggBuilders = new HashSet<>();
        aggBuilders.add(singleBucketAgg);
        aggBuilders.add(multiBucketAgg);

        // First try to point to a non-existent agg
        final AvgBucketPipelineAggregationBuilder builder = new AvgBucketPipelineAggregationBuilder("name", "invalid_agg>metric");
        IllegalArgumentException ex = expectThrows(IllegalArgumentException.class,
                () -> builder.validate(null, aggBuilders, Collections.emptySet()));
        assertEquals(PipelineAggregator.Parser.BUCKETS_PATH.getPreferredName()
                + " aggregation does not exist for aggregation [name]: invalid_agg>metric", ex.getMessage());

        // Now try to point to a single bucket agg
        AvgBucketPipelineAggregationBuilder builder2 = new AvgBucketPipelineAggregationBuilder("name", "global>metric");
        ex = expectThrows(IllegalArgumentException.class, () -> builder2.validate(null, aggBuilders, Collections.emptySet()));
        assertEquals("The first aggregation in " + PipelineAggregator.Parser.BUCKETS_PATH.getPreferredName()
                + " must be a multi-bucket aggregation for aggregation [name] found :" + GlobalAggregationBuilder.class.getName()
                + " for buckets path: global>metric", ex.getMessage());

        // Now try to point to a valid multi-bucket agg (no exception should be thrown)
        AvgBucketPipelineAggregationBuilder builder3 = new AvgBucketPipelineAggregationBuilder("name", "terms>metric");
        builder3.validate(null, aggBuilders, Collections.emptySet());

    }

}
