/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.flink.graph.asm.degree.annotate.directed;

import org.apache.flink.api.java.DataSet;
import org.apache.flink.graph.Vertex;
import org.apache.flink.graph.asm.AsmTestBase;
import org.apache.flink.graph.asm.dataset.ChecksumHashCode;
import org.apache.flink.graph.asm.dataset.ChecksumHashCode.Checksum;
import org.apache.flink.graph.asm.degree.annotate.directed.VertexDegrees.Degrees;
import org.apache.flink.test.util.TestBaseUtils;
import org.apache.flink.types.IntValue;
import org.apache.flink.types.LongValue;
import org.apache.flink.types.NullValue;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class VertexDegreesTest
extends AsmTestBase {

	@Test
	public void testWithSimpleDirectedGraph()
			throws Exception {
		DataSet<Vertex<IntValue, Degrees>> degrees = directedSimpleGraph
			.run(new VertexDegrees<IntValue, NullValue, NullValue>());

		String expectedResult =
			"(0,(2,2,0))\n" +
			"(1,(3,0,3))\n" +
			"(2,(3,2,1))\n" +
			"(3,(4,2,2))\n" +
			"(4,(1,0,1))\n" +
			"(5,(1,1,0))";

		TestBaseUtils.compareResultAsText(degrees.collect(), expectedResult);
	}

	@Test
	public void testWithSimpleUndirectedGraph()
			throws Exception {
		DataSet<Vertex<IntValue, Degrees>> degrees = undirectedSimpleGraph
			.run(new VertexDegrees<IntValue, NullValue, NullValue>());

		String expectedResult =
			"(0,(2,2,2))\n" +
			"(1,(3,3,3))\n" +
			"(2,(3,3,3))\n" +
			"(3,(4,4,4))\n" +
			"(4,(1,1,1))\n" +
			"(5,(1,1,1))";

		TestBaseUtils.compareResultAsText(degrees.collect(), expectedResult);
	}

	@Test
	public void testWithEmptyGraph()
			throws Exception {
		DataSet<Vertex<LongValue, Degrees>> degrees;

		degrees = emptyGraph
			.run(new VertexDegrees<LongValue, NullValue, NullValue>()
				.setIncludeZeroDegreeVertices(false));

		assertEquals(0, degrees.collect().size());

		degrees = emptyGraph
			.run(new VertexDegrees<LongValue, NullValue, NullValue>()
				.setIncludeZeroDegreeVertices(true));

		String expectedResult =
			"(0,(0,0,0))\n" +
			"(1,(0,0,0))\n" +
			"(2,(0,0,0))";

		TestBaseUtils.compareResultAsText(degrees.collect(), expectedResult);
	}

	@Test
	public void testWithRMatGraph()
	throws Exception {
		DataSet<Vertex<LongValue, Degrees>> degrees = directedRMatGraph(10, 16)
			.run(new VertexDegrees<LongValue, NullValue, NullValue>());

		Checksum checksum = new ChecksumHashCode<Vertex<LongValue, Degrees>>()
			.run(degrees)
			.execute();

		assertEquals(902, checksum.getCount());
		assertEquals(0x000001a3305dd86aL, checksum.getChecksum());
	}
}