/*
 * 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.operators;

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.operators.Order;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.test.operators.util.CollectionDataSets;
import org.apache.flink.test.util.MultipleProgramsTestBase;

import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import java.io.BufferedReader;
import java.io.File;
import java.util.Random;
import java.util.UUID;

import static org.junit.Assert.assertTrue;

/** Tests for data sinks. */
@SuppressWarnings("serial")
@RunWith(Parameterized.class)
public class DataSinkITCase extends MultipleProgramsTestBase {

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

    private String resultPath;

    @Rule public TemporaryFolder tempFolder = new TemporaryFolder();

    @Before
    public void before() throws Exception {
        final File folder = tempFolder.newFolder();
        final File resultFile = new File(folder, UUID.randomUUID().toString());
        resultPath = resultFile.toURI().toString();
    }

    @Test
    public void testIntSortingParallelism1() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Integer> ds = CollectionDataSets.getIntegerDataSet(env);
        ds.writeAsText(resultPath).sortLocalOutput("*", Order.DESCENDING).setParallelism(1);

        env.execute();

        String expected = "5\n5\n5\n5\n5\n4\n4\n4\n4\n3\n3\n3\n2\n2\n1\n";
        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testStringSortingParallelism1() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<String> ds = CollectionDataSets.getStringDataSet(env);
        ds.writeAsText(resultPath).sortLocalOutput("*", Order.ASCENDING).setParallelism(1);

        env.execute();

        String expected =
                "Hello\n"
                        + "Hello world\n"
                        + "Hello world, how are you?\n"
                        + "Hi\n"
                        + "I am fine.\n"
                        + "LOL\n"
                        + "Luke Skywalker\n"
                        + "Random comment\n";

        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testTupleSortingSingleAscParallelism1() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Tuple3<Integer, Long, String>> ds = CollectionDataSets.get3TupleDataSet(env);
        ds.writeAsCsv(resultPath).sortLocalOutput(0, Order.ASCENDING).setParallelism(1);

        env.execute();

        String expected =
                "1,1,Hi\n"
                        + "2,2,Hello\n"
                        + "3,2,Hello world\n"
                        + "4,3,Hello world, how are you?\n"
                        + "5,3,I am fine.\n"
                        + "6,3,Luke Skywalker\n"
                        + "7,4,Comment#1\n"
                        + "8,4,Comment#2\n"
                        + "9,4,Comment#3\n"
                        + "10,4,Comment#4\n"
                        + "11,5,Comment#5\n"
                        + "12,5,Comment#6\n"
                        + "13,5,Comment#7\n"
                        + "14,5,Comment#8\n"
                        + "15,5,Comment#9\n"
                        + "16,6,Comment#10\n"
                        + "17,6,Comment#11\n"
                        + "18,6,Comment#12\n"
                        + "19,6,Comment#13\n"
                        + "20,6,Comment#14\n"
                        + "21,6,Comment#15\n";

        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testTupleSortingSingleDescParallelism1() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Tuple3<Integer, Long, String>> ds = CollectionDataSets.get3TupleDataSet(env);
        ds.writeAsCsv(resultPath).sortLocalOutput(0, Order.DESCENDING).setParallelism(1);

        env.execute();

        String expected =
                "21,6,Comment#15\n"
                        + "20,6,Comment#14\n"
                        + "19,6,Comment#13\n"
                        + "18,6,Comment#12\n"
                        + "17,6,Comment#11\n"
                        + "16,6,Comment#10\n"
                        + "15,5,Comment#9\n"
                        + "14,5,Comment#8\n"
                        + "13,5,Comment#7\n"
                        + "12,5,Comment#6\n"
                        + "11,5,Comment#5\n"
                        + "10,4,Comment#4\n"
                        + "9,4,Comment#3\n"
                        + "8,4,Comment#2\n"
                        + "7,4,Comment#1\n"
                        + "6,3,Luke Skywalker\n"
                        + "5,3,I am fine.\n"
                        + "4,3,Hello world, how are you?\n"
                        + "3,2,Hello world\n"
                        + "2,2,Hello\n"
                        + "1,1,Hi\n";

        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testTupleSortingDualParallelism1() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Tuple3<Integer, Long, String>> ds = CollectionDataSets.get3TupleDataSet(env);
        ds.writeAsCsv(resultPath)
                .sortLocalOutput(1, Order.DESCENDING)
                .sortLocalOutput(0, Order.ASCENDING)
                .setParallelism(1);

        env.execute();

        String expected =
                "16,6,Comment#10\n"
                        + "17,6,Comment#11\n"
                        + "18,6,Comment#12\n"
                        + "19,6,Comment#13\n"
                        + "20,6,Comment#14\n"
                        + "21,6,Comment#15\n"
                        + "11,5,Comment#5\n"
                        + "12,5,Comment#6\n"
                        + "13,5,Comment#7\n"
                        + "14,5,Comment#8\n"
                        + "15,5,Comment#9\n"
                        + "7,4,Comment#1\n"
                        + "8,4,Comment#2\n"
                        + "9,4,Comment#3\n"
                        + "10,4,Comment#4\n"
                        + "4,3,Hello world, how are you?\n"
                        + "5,3,I am fine.\n"
                        + "6,3,Luke Skywalker\n"
                        + "2,2,Hello\n"
                        + "3,2,Hello world\n"
                        + "1,1,Hi\n";

        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testTupleSortingNestedParallelism1() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Tuple3<Tuple2<Integer, Integer>, String, Integer>> ds =
                CollectionDataSets.getGroupSortedNestedTupleDataSet2(env);
        ds.writeAsText(resultPath)
                .sortLocalOutput("f0.f1", Order.ASCENDING)
                .sortLocalOutput("f1", Order.DESCENDING)
                .setParallelism(1);

        env.execute();

        String expected =
                "((2,1),a,3)\n"
                        + "((2,2),b,4)\n"
                        + "((1,2),a,1)\n"
                        + "((3,3),c,5)\n"
                        + "((1,3),a,2)\n"
                        + "((3,6),c,6)\n"
                        + "((4,9),c,7)\n";

        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testTupleSortingNestedParallelism1_2() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Tuple3<Tuple2<Integer, Integer>, String, Integer>> ds =
                CollectionDataSets.getGroupSortedNestedTupleDataSet2(env);
        ds.writeAsText(resultPath)
                .sortLocalOutput(1, Order.ASCENDING)
                .sortLocalOutput(2, Order.DESCENDING)
                .setParallelism(1);

        env.execute();

        String expected =
                "((2,1),a,3)\n"
                        + "((1,3),a,2)\n"
                        + "((1,2),a,1)\n"
                        + "((2,2),b,4)\n"
                        + "((4,9),c,7)\n"
                        + "((3,6),c,6)\n"
                        + "((3,3),c,5)\n";

        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testPojoSortingSingleParallelism1() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<CollectionDataSets.POJO> ds = CollectionDataSets.getMixedPojoDataSet(env);
        ds.writeAsText(resultPath).sortLocalOutput("number", Order.ASCENDING).setParallelism(1);

        env.execute();

        String expected =
                "1 First (10,100,1000,One) 10100\n"
                        + "2 First_ (10,105,1000,One) 10200\n"
                        + "3 First (11,102,3000,One) 10200\n"
                        + "4 First_ (11,106,1000,One) 10300\n"
                        + "5 First (11,102,2000,One) 10100\n"
                        + "6 Second_ (20,200,2000,Two) 10100\n"
                        + "7 Third (31,301,2000,Three) 10200\n"
                        + "8 Third_ (30,300,1000,Three) 10100\n";

        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testPojoSortingDualParallelism1() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<CollectionDataSets.POJO> ds = CollectionDataSets.getMixedPojoDataSet(env);
        ds.writeAsText(resultPath)
                .sortLocalOutput("str", Order.ASCENDING)
                .sortLocalOutput("number", Order.DESCENDING)
                .setParallelism(1);

        env.execute();

        String expected =
                "5 First (11,102,2000,One) 10100\n"
                        + "3 First (11,102,3000,One) 10200\n"
                        + "1 First (10,100,1000,One) 10100\n"
                        + "4 First_ (11,106,1000,One) 10300\n"
                        + "2 First_ (10,105,1000,One) 10200\n"
                        + "6 Second_ (20,200,2000,Two) 10100\n"
                        + "7 Third (31,301,2000,Three) 10200\n"
                        + "8 Third_ (30,300,1000,Three) 10100\n";

        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testPojoSortingNestedParallelism1() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<CollectionDataSets.POJO> ds = CollectionDataSets.getMixedPojoDataSet(env);
        ds.writeAsText(resultPath)
                .sortLocalOutput("nestedTupleWithCustom.f0", Order.ASCENDING)
                .sortLocalOutput("nestedTupleWithCustom.f1.myInt", Order.DESCENDING)
                .sortLocalOutput("nestedPojo.longNumber", Order.ASCENDING)
                .setParallelism(1);

        env.execute();

        String expected =
                "2 First_ (10,105,1000,One) 10200\n"
                        + "1 First (10,100,1000,One) 10100\n"
                        + "4 First_ (11,106,1000,One) 10300\n"
                        + "5 First (11,102,2000,One) 10100\n"
                        + "3 First (11,102,3000,One) 10200\n"
                        + "6 Second_ (20,200,2000,Two) 10100\n"
                        + "8 Third_ (30,300,1000,Three) 10100\n"
                        + "7 Third (31,301,2000,Three) 10200\n";

        compareResultsByLinesInMemoryWithStrictOrder(expected, resultPath);
    }

    @Test
    public void testSortingParallelism4() throws Exception {
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Long> ds = env.generateSequence(0, 1000);
        // randomize
        ds.map(
                        new MapFunction<Long, Long>() {

                            Random rand = new Random(1234L);

                            @Override
                            public Long map(Long value) throws Exception {
                                return rand.nextLong();
                            }
                        })
                .writeAsText(resultPath)
                .sortLocalOutput("*", Order.ASCENDING)
                .setParallelism(4);

        env.execute();

        BufferedReader[] resReaders = getResultReader(resultPath);
        for (BufferedReader br : resReaders) {
            long cmp = Long.MIN_VALUE;
            while (br.ready()) {
                long cur = Long.parseLong(br.readLine());
                assertTrue("Invalid order of sorted output", cmp <= cur);
                cmp = cur;
            }
            br.close();
        }
    }
}