/*
 * 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.actions;

import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.tuple.Tuple2;

import java.util.ArrayList;
import java.util.HashMap;

import static org.junit.Assert.*;

import org.apache.flink.test.util.MultipleProgramsTestBase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

/**
 * Tests the methods that bring elements back to the client driver program.
 */
@RunWith(Parameterized.class)
public class CountCollectITCase extends MultipleProgramsTestBase {

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

	@Test
	public void testSimple() throws Exception {
		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

		Integer[] input = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

		DataSet<Integer> data = env.fromElements(input);

		// count
		long numEntries = data.count();
		assertEquals(10, numEntries);

		// collect
		ArrayList<Integer> list = (ArrayList<Integer>) data.collect();
		assertArrayEquals(input, list.toArray());
	}

	@Test
	public void testAdvanced() throws Exception {
		ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
		env.getConfig().disableObjectReuse();


		DataSet<Integer> data = env.fromElements(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
		DataSet<Integer> data2 = env.fromElements(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

		DataSet<Tuple2<Integer, Integer>> data3 = data.cross(data2);

		// count
		long numEntries = data3.count();
		assertEquals(100, numEntries);

		// collect
		ArrayList<Tuple2<Integer, Integer>> list = (ArrayList<Tuple2<Integer, Integer>>) data3.collect();

		// set expected entries in a hash map to true
		HashMap<Tuple2<Integer, Integer>, Boolean> expected = new HashMap<Tuple2<Integer, Integer>, Boolean>();
		for (int i = 1; i <= 10; i++) {
			for (int j = 1; j <= 10; j++) {
				expected.put(new Tuple2<Integer, Integer>(i, j), true);
			}
		}

		// check if all entries are contained in the hash map
		for (int i = 0; i < 100; i++) {
			Tuple2<Integer, Integer> element = list.get(i);
			assertEquals(expected.get(element), true);
			expected.remove(element);
		}
	}
}