/*
 * 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.streaming.runtime;

import org.apache.flink.api.common.functions.FilterFunction;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.co.CoFlatMapFunction;
import org.apache.flink.streaming.util.StreamingMultipleProgramsTestBase;
import org.apache.flink.test.streaming.runtime.util.TestListResultSink;
import org.apache.flink.util.Collector;

import org.junit.Test;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import static org.junit.Assert.assertEquals;

@SuppressWarnings("serial")
public class CoStreamITCase extends StreamingMultipleProgramsTestBase {

	@Test
	public void test() throws Exception {

		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
		env.setParallelism(1);

		TestListResultSink<String> resultSink = new TestListResultSink<String>();

		DataStream<Integer> src = env.fromElements(1, 3, 5);

		DataStream<Integer> filter1 = src
				.filter(new FilterFunction<Integer>() {
					@Override
					public boolean filter(Integer value) throws Exception {
						return true;
					}
				})
				
				.keyBy(new KeySelector<Integer, Integer>() {
					@Override
					public Integer getKey(Integer value) throws Exception {
						return value;
					}
				});

		DataStream<Tuple2<Integer, Integer>> filter2 = src
				.map(new MapFunction<Integer, Tuple2<Integer, Integer>>() {

					@Override
					public Tuple2<Integer, Integer> map(Integer value) throws Exception {
						return new Tuple2<>(value, value + 1);
					}
				})
				.rebalance()
				.filter(new FilterFunction<Tuple2<Integer, Integer>>() {

					@Override
					public boolean filter(Tuple2<Integer, Integer> value) throws Exception {
						return true;
					}
				})
				.disableChaining()
				.keyBy(new KeySelector<Tuple2<Integer, Integer>, Integer>() {

					@Override
					public Integer getKey(Tuple2<Integer, Integer> value) throws Exception {
						return value.f0;
					}
				});

		DataStream<String> connected = filter1.connect(filter2)
				.flatMap(new CoFlatMapFunction<Integer, Tuple2<Integer, Integer>, String>() {

					@Override
					public void flatMap1(Integer value, Collector<String> out) throws Exception {
						out.collect(value.toString());
					}
		
					@Override
					public void flatMap2(Tuple2<Integer, Integer> value, Collector<String> out) throws Exception {
						out.collect(value.toString());
					}
				});

		connected.addSink(resultSink);

		
		env.execute();

		List<String> expected = Arrays.asList("(1,2)", "(3,4)", "(5,6)", "1", "3", "5");
		List<String> result = resultSink.getResult();
		Collections.sort(result);
		assertEquals(expected, result);
	}
}