/*
 * 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.test.javaApiOperators;


import java.util.List;

import org.apache.flink.api.common.functions.FilterFunction;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.io.ReplicatingInputFormat;
import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.io.ParallelIteratorInputFormat;
import org.apache.flink.api.java.tuple.Tuple;
import org.apache.flink.api.java.tuple.Tuple1;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.core.io.GenericInputSplit;
import org.apache.flink.test.util.MultipleProgramsTestBase;
import org.apache.flink.util.NumberSequenceIterator;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

/**
 * Tests for replicating DataSources
 */

@RunWith(Parameterized.class)
public class ReplicatingDataSourceITCase extends MultipleProgramsTestBase {

	public ReplicatingDataSourceITCase(TestExecutionMode mode){
		super(mode);
	}

	@Test
	public void testReplicatedSourceToJoin() throws Exception {
		/*
		 * Test replicated source going into join
		 */

		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

		DataSet<Tuple1<Long>> source1 = env.createInput(new ReplicatingInputFormat<Long, GenericInputSplit>
				(new ParallelIteratorInputFormat<Long>(new NumberSequenceIterator(0l, 1000l))), BasicTypeInfo.LONG_TYPE_INFO)
				.map(new ToTuple());
		DataSet<Tuple1<Long>> source2 = env.generateSequence(0l, 1000l).map(new ToTuple());

		DataSet<Tuple> pairs = source1.join(source2).where(0).equalTo(0)
				.projectFirst(0)
				.sum(0);

		List<Tuple> result = pairs.collect();

		String expectedResult = "(500500)";

		compareResultAsText(result, expectedResult);
	}

	@Test
	public void testReplicatedSourceToCross() throws Exception {
		/*
		 * Test replicated source going into cross
		 */

		final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

		DataSet<Tuple1<Long>> source1 = env.createInput(new ReplicatingInputFormat<Long, GenericInputSplit>
				(new ParallelIteratorInputFormat<Long>(new NumberSequenceIterator(0l, 1000l))), BasicTypeInfo.LONG_TYPE_INFO)
				.map(new ToTuple());
		DataSet<Tuple1<Long>> source2 = env.generateSequence(0l, 1000l).map(new ToTuple());

		DataSet<Tuple1<Long>> pairs = source1.cross(source2)
				.filter(new FilterFunction<Tuple2<Tuple1<Long>, Tuple1<Long>>>() {
					@Override
					public boolean filter(Tuple2<Tuple1<Long>, Tuple1<Long>> value) throws Exception {
						return value.f0.f0.equals(value.f1.f0);
					}
				})
				.map(new MapFunction<Tuple2<Tuple1<Long>, Tuple1<Long>>, Tuple1<Long>>() {
					@Override
					public Tuple1<Long> map(Tuple2<Tuple1<Long>, Tuple1<Long>> value) throws Exception {
						return value.f0;
					}
				})
				.sum(0);

		List<Tuple1<Long>> result = pairs.collect();

		String expectedResult = "(500500)";

		compareResultAsText(result, expectedResult);
	}


	public static class ToTuple implements MapFunction<Long, Tuple1<Long>> {

		@Override
		public Tuple1<Long> map(Long value) throws Exception {
			return new Tuple1<Long>(value);
		}
	}


}