/***********************************************************************************************************************
 *
 * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
 *
 * Licensed 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 eu.stratosphere.api.java.operator;

import java.util.ArrayList;
import java.util.List;

import junit.framework.Assert;

import org.junit.Test;

import eu.stratosphere.api.common.InvalidProgramException;
import eu.stratosphere.api.java.DataSet;
import eu.stratosphere.api.java.ExecutionEnvironment;
import eu.stratosphere.api.java.aggregation.Aggregations;
import eu.stratosphere.api.java.aggregation.UnsupportedAggregationTypeException;
import eu.stratosphere.api.java.tuple.Tuple5;
import eu.stratosphere.api.java.typeutils.BasicTypeInfo;
import eu.stratosphere.api.java.typeutils.TupleTypeInfo;

public class AggregateOperatorTest {

	// TUPLE DATA
	
	private final List<Tuple5<Integer, Long, String, Long, Integer>> emptyTupleData = 
			new ArrayList<Tuple5<Integer, Long, String, Long, Integer>>();
	
	private final TupleTypeInfo<Tuple5<Integer, Long, String, Long, Integer>> tupleTypeInfo = new 
			TupleTypeInfo<Tuple5<Integer, Long, String, Long, Integer>>(
					BasicTypeInfo.INT_TYPE_INFO,
					BasicTypeInfo.LONG_TYPE_INFO,
					BasicTypeInfo.STRING_TYPE_INFO,
					BasicTypeInfo.LONG_TYPE_INFO,
					BasicTypeInfo.INT_TYPE_INFO
			);
	
	// LONG DATA
	
	private final List<Long> emptyLongData = new ArrayList<Long>();
	
	@Test
	public void testFieldsAggregate() {
		
		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		// should work
		try {
			tupleDs.aggregate(Aggregations.SUM, 1);
		} catch(Exception e) {
			Assert.fail();
		}
		
		// should not work: index out of bounds
		try {
			tupleDs.aggregate(Aggregations.SUM, 10);
			Assert.fail();
		} catch(IllegalArgumentException iae) {
			// we're good here
		} catch(Exception e) {
			Assert.fail();
		}
		
		// should not work: not applied to tuple dataset
		DataSet<Long> longDs = env.fromCollection(emptyLongData, BasicTypeInfo.LONG_TYPE_INFO);
		try {
			longDs.aggregate(Aggregations.MIN, 1);
			Assert.fail();
		} catch(InvalidProgramException uoe) {
			// we're good here
		} catch(Exception e) {
			Assert.fail();
		}
		
	}
	
	@Test
	public void testAggregationTypes() {
		try {
			final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
			DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);
			
			// should work: multiple aggregates
			tupleDs.aggregate(Aggregations.SUM, 0).and(Aggregations.MIN, 4);

			// should work: nested aggregates
			tupleDs.aggregate(Aggregations.MIN, 2).aggregate(Aggregations.SUM, 1);
			
			// should not work: average on string
			try {
				tupleDs.aggregate(Aggregations.SUM, 2);
				Assert.fail();
			} catch (UnsupportedAggregationTypeException iae) {
				// we're good here
			}
		}
		catch(Exception e) {
			System.err.println(e.getMessage());
			e.printStackTrace();
			Assert.fail(e.getMessage());
		}
	}
}