/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * 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.
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/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.search.aggregations.pipeline;

import org.opensearch.search.aggregations.AggregationBuilder;
import org.opensearch.search.aggregations.BasePipelineAggregationTestCase;

import java.io.IOException;

import static java.util.Collections.emptyList;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.nullValue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public class CumulativeSumTests extends BasePipelineAggregationTestCase<CumulativeSumPipelineAggregationBuilder> {
    @Override
    protected CumulativeSumPipelineAggregationBuilder createTestAggregatorFactory() {
        String name = randomAlphaOfLengthBetween(3, 20);
        String bucketsPath = randomAlphaOfLengthBetween(3, 20);
        CumulativeSumPipelineAggregationBuilder factory = new CumulativeSumPipelineAggregationBuilder(name, bucketsPath);
        if (randomBoolean()) {
            factory.format(randomAlphaOfLengthBetween(1, 10));
        }
        return factory;
    }

    public void testValidate() throws IOException {
        assertThat(
            validate(
                PipelineAggregationHelperTests.getRandomSequentiallyOrderedParentAgg(),
                new CumulativeSumPipelineAggregationBuilder("name", "valid")
            ),
            nullValue()
        );
    }

    public void testInvalidParent() throws IOException {
        AggregationBuilder parent = mock(AggregationBuilder.class);
        when(parent.getName()).thenReturn("name");

        assertThat(
            validate(parent, new CumulativeSumPipelineAggregationBuilder("name", "invalid_agg>metric")),
            equalTo(
                "Validation Failed: 1: cumulative_sum aggregation [name] must have a histogram, date_histogram "
                    + "or auto_date_histogram as parent;"
            )
        );
    }

    public void testNoParent() throws IOException {
        assertThat(
            validate(emptyList(), new CumulativeSumPipelineAggregationBuilder("name", "invalid_agg>metric")),
            equalTo(
                "Validation Failed: 1: cumulative_sum aggregation [name] must have a histogram, date_histogram "
                    + "or auto_date_histogram as parent but doesn't have a parent;"
            )
        );
    }
}