/*
 * 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.common.operators.base;

import static org.junit.Assert.*;
import static org.powermock.api.mockito.PowerMockito.mock;

import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.common.TaskInfo;
import org.apache.flink.api.common.accumulators.AbstractAccumulatorRegistry;
import org.apache.flink.api.common.functions.FlatJoinFunction;
import org.apache.flink.api.common.functions.RichFlatJoinFunction;
import org.apache.flink.api.common.functions.util.RuntimeUDFContext;
import org.apache.flink.api.common.operators.BinaryOperatorInformation;
import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.fs.Path;
import org.apache.flink.metrics.groups.UnregisteredMetricsGroup;
import org.apache.flink.util.Collector;

import org.junit.Test;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicBoolean;

@SuppressWarnings("serial")
public class InnerJoinOperatorBaseTest implements Serializable {

	@Test
	public void testJoinPlain(){
		final FlatJoinFunction<String, String, Integer> joiner = new FlatJoinFunction<String, String, Integer>() {

			@Override
			public void join(String first, String second, Collector<Integer> out) throws Exception {
				out.collect(first.length());
				out.collect(second.length());
			}
		};

		@SuppressWarnings({ "rawtypes", "unchecked" })
		InnerJoinOperatorBase<String, String, Integer,
						FlatJoinFunction<String, String,Integer> > base = new InnerJoinOperatorBase(joiner,
				new BinaryOperatorInformation(BasicTypeInfo.STRING_TYPE_INFO, BasicTypeInfo.STRING_TYPE_INFO,
						BasicTypeInfo.INT_TYPE_INFO), new int[0], new int[0], "TestJoiner");

		List<String> inputData1 = new ArrayList<String>(Arrays.asList("foo", "bar", "foobar"));
		List<String> inputData2 = new ArrayList<String>(Arrays.asList("foobar", "foo"));
		List<Integer> expected = new ArrayList<Integer>(Arrays.asList(3, 3, 6 ,6));

		try {
			ExecutionConfig executionConfig = new ExecutionConfig();
			executionConfig.disableObjectReuse();
			List<Integer> resultSafe = base.executeOnCollections(inputData1, inputData2, null, executionConfig);
			executionConfig.enableObjectReuse();
			List<Integer> resultRegular = base.executeOnCollections(inputData1, inputData2, null, executionConfig);

			assertEquals(expected, resultSafe);
			assertEquals(expected, resultRegular);
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}

	@Test
	public void testJoinRich(){
		final AtomicBoolean opened = new AtomicBoolean(false);
		final AtomicBoolean closed = new AtomicBoolean(false);
		final String taskName = "Test rich join function";

		final RichFlatJoinFunction<String, String, Integer> joiner = new RichFlatJoinFunction<String, String, Integer>() {
			@Override
			public void open(Configuration parameters) throws Exception {
				opened.compareAndSet(false, true);
				assertEquals(0, getRuntimeContext().getIndexOfThisSubtask());
				assertEquals(1, getRuntimeContext().getNumberOfParallelSubtasks());
			}

			@Override
			public void close() throws Exception{
				closed.compareAndSet(false, true);
			}

			@Override
			public void join(String first, String second, Collector<Integer> out) throws Exception {
				out.collect(first.length());
				out.collect(second.length());
			}
		};

		InnerJoinOperatorBase<String, String, Integer,
						RichFlatJoinFunction<String, String, Integer>> base = new InnerJoinOperatorBase<String, String, Integer,
										RichFlatJoinFunction<String, String, Integer>>(joiner, new BinaryOperatorInformation<String, String,
				Integer>(BasicTypeInfo.STRING_TYPE_INFO, BasicTypeInfo.STRING_TYPE_INFO,
				BasicTypeInfo.INT_TYPE_INFO), new int[0], new int[0], taskName);

		final List<String> inputData1 = new ArrayList<String>(Arrays.asList("foo", "bar", "foobar"));
		final List<String> inputData2 = new ArrayList<String>(Arrays.asList("foobar", "foo"));
		final List<Integer> expected = new ArrayList<Integer>(Arrays.asList(3, 3, 6, 6));


		try {
			final TaskInfo taskInfo = new TaskInfo(taskName, 1, 0, 1, 0);
			final AbstractAccumulatorRegistry accumulatorRegistry = mock(AbstractAccumulatorRegistry.class);
			final HashMap<String, Future<Path>> cpTasks = new HashMap<>();

			ExecutionConfig executionConfig = new ExecutionConfig();
			
			executionConfig.disableObjectReuse();
			List<Integer> resultSafe = base.executeOnCollections(inputData1, inputData2,
					new RuntimeUDFContext(taskInfo, null, executionConfig, cpTasks,
							accumulatorRegistry, new UnregisteredMetricsGroup()),
					executionConfig);
			
			executionConfig.enableObjectReuse();
			List<Integer> resultRegular = base.executeOnCollections(inputData1, inputData2,
					new RuntimeUDFContext(taskInfo, null, executionConfig, cpTasks,
							accumulatorRegistry, new UnregisteredMetricsGroup()),
					executionConfig);

			assertEquals(expected, resultSafe);
			assertEquals(expected, resultRegular);
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}

		assertTrue(opened.get());
		assertTrue(closed.get());
	}
}