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 * 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.
 */

package org.elasticsearch.search.aggregations;

import org.elasticsearch.common.io.stream.BytesStreamOutput;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.search.aggregations.Aggregator.SubAggCollectionMode;
import org.elasticsearch.test.ESTestCase;

import java.io.IOException;

import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.Matchers.equalTo;

public class SubAggCollectionModeTests extends ESTestCase {

    public void testValidOrdinals() {
        assertThat(SubAggCollectionMode.DEPTH_FIRST.ordinal(), equalTo(0));
        assertThat(SubAggCollectionMode.BREADTH_FIRST.ordinal(), equalTo(1));
    }

    public void testwriteTo() throws Exception {
        try (BytesStreamOutput out = new BytesStreamOutput()) {
            SubAggCollectionMode.DEPTH_FIRST.writeTo(out);
            try (StreamInput in = out.bytes().streamInput()) {
                assertThat(in.readVInt(), equalTo(0));
            }
        }

        try (BytesStreamOutput out = new BytesStreamOutput()) {
            SubAggCollectionMode.BREADTH_FIRST.writeTo(out);
            try (StreamInput in = out.bytes().streamInput()) {
                assertThat(in.readVInt(), equalTo(1));
            }
        }
    }

    public void testReadFrom() throws Exception {
        try (BytesStreamOutput out = new BytesStreamOutput()) {
            out.writeVInt(0);
            try (StreamInput in = out.bytes().streamInput()) {
                assertThat(SubAggCollectionMode.readFromStream(in), equalTo(SubAggCollectionMode.DEPTH_FIRST));
            }
        }
        try (BytesStreamOutput out = new BytesStreamOutput()) {
            out.writeVInt(1);
            try (StreamInput in = out.bytes().streamInput()) {
                assertThat(SubAggCollectionMode.readFromStream(in), equalTo(SubAggCollectionMode.BREADTH_FIRST));
            }
        }
    }

    public void testInvalidReadFrom() throws Exception {
        try (BytesStreamOutput out = new BytesStreamOutput()) {
            out.writeVInt(randomIntBetween(2, Integer.MAX_VALUE));
            try (StreamInput in = out.bytes().streamInput()) {
                SubAggCollectionMode.readFromStream(in);
                fail("Expected IOException");
            } catch(IOException e) {
                assertThat(e.getMessage(), containsString("Unknown SubAggCollectionMode ordinal ["));
            }

        }
    }
}
