/*
 * 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.streaming.scala.api;

import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.core.fs.FileSystem;
import org.apache.flink.streaming.api.scala.OutputFormatTestPrograms;
import org.apache.flink.streaming.util.StreamingMultipleProgramsTestBase;
import org.apache.flink.test.testdata.WordCountData;
import org.apache.flink.test.util.AbstractTestBase;
import org.apache.flink.util.Collector;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import static org.junit.Assert.*;


public class CsvOutputFormatITCase extends StreamingMultipleProgramsTestBase  {

	protected String resultPath;

	public AbstractTestBase fileInfo = new AbstractTestBase(new Configuration()) {
		@Override
		public void startCluster() throws Exception {
			super.startCluster();
		}
	};

	@Before
	public void createFile() throws Exception {
		File f = fileInfo.createAndRegisterTempFile("result");
		resultPath = f.toURI().toString();
	}

	@Test
	public void testPath() throws Exception {
		OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath);
	}

	@Test
	public void testPathMillis() throws Exception {
		OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath);
	}

	@Test
	public void testPathWriteMode() throws Exception {
		OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath, FileSystem.WriteMode.NO_OVERWRITE);
	}

	@Test
	public void testPathWriteModeMillis() throws Exception {
		OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath, FileSystem.WriteMode.NO_OVERWRITE);
	}

	@Test
	public void testPathWriteModeMillisDelimiter() throws Exception {
		OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath, FileSystem.WriteMode.NO_OVERWRITE, "\n", ",");
	}

	@Test
	public void failPathWriteMode() throws Exception {
		OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath);
		try {
			OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath, FileSystem.WriteMode.NO_OVERWRITE);
			fail("File should exist.");
		} catch (Exception e) {
			assertTrue(e.getCause().getMessage().contains("File already exists"));
		}
	}

	@Test
	public void failPathWriteModeMillis() throws Exception {
		OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath);
		try {
			OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath, FileSystem.WriteMode.NO_OVERWRITE);
			fail("File should exist");
		} catch (Exception e) {
			assertTrue(e.getCause().getMessage().contains("File already exists"));
		}
	}

	@Test
	public void failPathWriteModeMillisDelimiter() throws Exception {
		OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath);
		try {
			OutputFormatTestPrograms.wordCountToCsv(WordCountData.TEXT, resultPath, FileSystem.WriteMode.NO_OVERWRITE, "\n", ",");
			fail("File should exist.");
		} catch (Exception e) {
			assertTrue(e.getCause().getMessage().contains("File already exists"));
		}
	}

	@After
	public void closeFile() throws Exception {
		compareResultsByLinesInMemory(WordCountData.STREAMING_COUNTS_AS_TUPLES
				.replaceAll("[\\\\(\\\\)]", ""), resultPath);
		fileInfo.stopCluster();
	}

	public static final class Tokenizer implements FlatMapFunction<String, Tuple2<String, Integer>> {
		private static final long serialVersionUID = 1L;

		@Override
		public void flatMap(String value, Collector<Tuple2<String, Integer>> out)
				throws Exception {
			// normalize and split the line
			String[] tokens = value.toLowerCase().split("\\W+");

			// emit the pairs
			for (String token : tokens) {
				if (token.length() > 0) {
					out.collect(new Tuple2<>(token, 1));
				}
			}
		}
	}

}