/*
 * 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.api.java.operators.translation;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import org.apache.flink.api.common.Plan;
import org.apache.flink.api.common.operators.GenericDataSinkBase;
import org.apache.flink.api.common.operators.GenericDataSourceBase;
import org.apache.flink.api.common.operators.base.GroupReduceOperatorBase;
import org.apache.flink.api.java.aggregation.Aggregations;
import org.apache.flink.api.java.io.DiscardingOutputFormat;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.types.StringValue;
import org.junit.Test;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;

public class AggregateTranslationTest {

	@Test
	public void translateAggregate() {
		try {
			final int parallelism = 8;
			ExecutionEnvironment env = ExecutionEnvironment.createLocalEnvironment(parallelism);
			
			@SuppressWarnings("unchecked")
			DataSet<Tuple3<Double, StringValue, Long>> initialData = 
					env.fromElements(new Tuple3<Double, StringValue, Long>(3.141592, new StringValue("foobar"), Long.valueOf(77)));
			
			initialData.groupBy(0).aggregate(Aggregations.MIN, 1).and(Aggregations.SUM, 2).output(new DiscardingOutputFormat<Tuple3<Double, StringValue, Long>>());
			
			Plan p = env.createProgramPlan();
			
			GenericDataSinkBase<?> sink = p.getDataSinks().iterator().next();
			
			GroupReduceOperatorBase<?, ?, ?> reducer = (GroupReduceOperatorBase<?, ?, ?>) sink.getInput();
			
			// check keys
			assertEquals(1, reducer.getKeyColumns(0).length);
			assertEquals(0, reducer.getKeyColumns(0)[0]);
			
			assertEquals(-1, reducer.getParallelism());
			assertTrue(reducer.isCombinable());
			
			assertTrue(reducer.getInput() instanceof GenericDataSourceBase<?, ?>);
		}
		catch (Exception e) {
			System.err.println(e.getMessage());
			e.printStackTrace();
			fail("Test caused an error: " + e.getMessage());
		}
	}
}