/*
 * 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.operator;

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

import org.junit.Assert;
import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.api.java.tuple.Tuple5;
import org.apache.flink.api.java.typeutils.TupleTypeInfo;
import org.junit.Test;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;

public class ProjectionOperatorTest {

	// 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 testFieldsProjection() {
		
		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		// should work
		try {
			tupleDs.project(0);
		} catch(Exception e) {
			Assert.fail();
		}
		
		// should not work: too many fields
		try {
			tupleDs.project(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25);
			Assert.fail();
		} catch(IllegalArgumentException iae) {
			// we're good here
		} catch(Exception e) {
			Assert.fail();
		}
		
		// should not work: index out of bounds of input tuple
		try {
			tupleDs.project(0,5,2);
			Assert.fail();
		} catch(IndexOutOfBoundsException ioobe) {
			// 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.project(0);
			Assert.fail();
		} catch(UnsupportedOperationException uoe) {
			// we're good here
		} catch(Exception e) {
			Assert.fail();
		}
		
	}
	
	@Test
	public void testProjectionTypes() {
		
		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		// should work
		try {
			tupleDs.project(0);
		} catch(Exception e) {
			Assert.fail();
		}
		
		// should work: dummy types() here
		try {
			tupleDs.project(2,1,4);
		} catch(Exception e) {
			Assert.fail();
		}
		
	}
	
	@Test
	public void testProjectionWithoutTypes() {
		
		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		DataSet<Tuple5<Integer, Long, String, Long, Integer>> tupleDs = env.fromCollection(emptyTupleData, tupleTypeInfo);

		// should work
		try {
			tupleDs.project(2,0,4);
		} catch(Exception e) {
			Assert.fail();
		}
		
		// should not work: field index is out of bounds of input tuple
		try {
			tupleDs.project(2,-1,4);
			Assert.fail();
		} catch(IndexOutOfBoundsException iob) {
			// we're good here
		} catch(Exception e) {
			Assert.fail();
		}
		
		// should not work: field index is out of bounds of input tuple
		try {
			tupleDs.project(2,1,4,5,8,9);
			Assert.fail();
		} catch(IndexOutOfBoundsException iob) {
			// we're good here
		} catch(Exception e) {
			Assert.fail();
		}
		
	}
	
}