/*
 * 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.pig.test;


import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import junit.framework.Assert;
import junit.framework.TestCase;

import org.apache.pig.EvalFunc;
import org.apache.pig.ExecType;
import org.apache.pig.FuncSpec;
import org.apache.pig.LoadFunc;
import org.apache.pig.PigServer;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.backend.hadoop.datastorage.ConfigurationUtil;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.POStatus;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.Result;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLoad;
import org.apache.pig.builtin.PigStorage;
import org.apache.pig.data.BagFactory;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.DataByteArray;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.io.FileSpec;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.test.utils.TestHelper;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public class TestJoinSmoke extends TestCase{
    private static final String FR_INPUT_FILE = "testFrJoinInput.txt";

    private static final String SKEW_INPUT_FILE1 = "SkewedJoinInput1.txt";
    private static final String SKEW_INPUT_FILE2 = "SkewedJoinInput2.txt";
    private static final String SKEW_INPUT_FILE5 = "SkewedJoinInput5.txt";

    private PigServer pigServer;
    private static MiniCluster cluster = MiniCluster.buildCluster();
    private File tmpFile;
    
    public TestJoinSmoke() throws ExecException, IOException{
        pigServer = new PigServer(ExecType.MAPREDUCE, cluster.getProperties());
//        pigServer = new PigServer(ExecType.LOCAL);
        
    }
    
    @Before
    public void setUp() throws Exception {
        setupFRJoin();
	setupSkewJoin();
    }

    private void setupFRJoin() throws Exception {
        int LOOP_SIZE = 2;
        String[] input = new String[2*LOOP_SIZE];
        int k = 0;
        for(int i = 1; i <= LOOP_SIZE; i++) {
            String si = i + "";
            for(int j=1;j<=LOOP_SIZE;j++)
                input[k++] = si + "\t" + j;
        }
        Util.createInputFile(cluster, FR_INPUT_FILE, input);
    }

    private void setupSkewJoin() throws IOException {
        PrintWriter w = new PrintWriter(new FileWriter(SKEW_INPUT_FILE1));

        int k = 0;
        for(int j=0; j<120; j++) {
                w.println("100\tapple1\taaa" + k);
            k++;
            w.println("200\torange1\tbbb" + k);
            k++;
            w.println("300\tstrawberry\tccc" + k);
            k++;
        }

        w.close();

        PrintWriter w2 = new PrintWriter(new FileWriter(SKEW_INPUT_FILE2));
        w2.println("100\tapple1");
        w2.println("100\tapple2");
        w2.println("100\tapple2");
        w2.println("200\torange1");
        w2.println("200\torange2");
        w2.println("300\tstrawberry");
        w2.println("400\tpear");

        w2.close();

        // Create a file with null keys
        PrintWriter w5 = new PrintWriter(new FileWriter(SKEW_INPUT_FILE5));
        for(int i=0; i < 10; i++) {
                w5.println("\tapple1");
        }
        w5.println("100\tapple2");
        for(int i=0; i < 10; i++) {
                w5.println("\torange1");
        }
        w5.println("\t");
        w5.println("100\t");
        w5.close();

	Util.copyFromLocalToCluster(cluster,SKEW_INPUT_FILE1,SKEW_INPUT_FILE1);
        Util.copyFromLocalToCluster(cluster,SKEW_INPUT_FILE2,SKEW_INPUT_FILE2);
        Util.copyFromLocalToCluster(cluster,SKEW_INPUT_FILE5,SKEW_INPUT_FILE5);
    }

    @AfterClass
    public static void oneTimeTearDown() throws Exception {
        cluster.shutDown();
    }
    
    @After
    public void tearDown() throws Exception {
        Util.deleteFile(cluster, FR_INPUT_FILE);
        tearDownSkewJoin();
    }

    private void tearDownSkewJoin() throws Exception {
        new File(SKEW_INPUT_FILE1).delete();
        new File(SKEW_INPUT_FILE2).delete();
        new File(SKEW_INPUT_FILE5).delete();
        Util.deleteDirectory(new File("skewedjoin"));

        Util.deleteFile(cluster,SKEW_INPUT_FILE1);
        Util.deleteFile(cluster,SKEW_INPUT_FILE2);
        Util.deleteFile(cluster,SKEW_INPUT_FILE5);
    }

    @Test
    public void testFRJoin() throws IOException{
        pigServer.registerQuery("A = LOAD '" + FR_INPUT_FILE + "' as (x:int,y:int);");
        pigServer.registerQuery("B = LOAD '" + FR_INPUT_FILE + "' as (x:int,y:int);");
        DataBag dbfrj = BagFactory.getInstance().newDefaultBag(), dbshj = BagFactory.getInstance().newDefaultBag();
        {
            pigServer.registerQuery("C = join A by $0, B by $0 using 'replicated';");
            Iterator<Tuple> iter = pigServer.openIterator("C");
            
            while(iter.hasNext()) {
                dbfrj.add(iter.next());
            }
        }
        {
            pigServer.registerQuery("C = join A by $0, B by $0;");
            Iterator<Tuple> iter = pigServer.openIterator("C");
            
            while(iter.hasNext()) {
                dbshj.add(iter.next());
            }
        }
        Assert.assertTrue(dbfrj.size()>0 && dbshj.size()>0);
        Assert.assertEquals(true, TestHelper.compareBags(dbfrj, dbshj));
    }

    @Test
    public void testSkewedJoinWithGroup() throws IOException{
        pigServer.registerQuery("A = LOAD '" + SKEW_INPUT_FILE1 + "' as (id, name, n);");
        pigServer.registerQuery("B = LOAD '" + SKEW_INPUT_FILE2 + "' as (id, name);");
        pigServer.registerQuery("C = GROUP A by id;");
        pigServer.registerQuery("D = GROUP B by id;");

        DataBag dbfrj = BagFactory.getInstance().newDefaultBag(), dbshj = BagFactory.getInstance().newDefaultBag();
        {
            pigServer.registerQuery("E = join C by group, D by group using 'skewed' parallel 5;");
            Iterator<Tuple> iter = pigServer.openIterator("E");

            while(iter.hasNext()) {
                dbfrj.add(iter.next());
            }
        }
        {
            pigServer.registerQuery("E = join C by group, D by group;");
            Iterator<Tuple> iter = pigServer.openIterator("E");

            while(iter.hasNext()) {
                dbshj.add(iter.next());
            }
        }
        Assert.assertTrue(dbfrj.size()>0 && dbshj.size()>0);
        Assert.assertEquals(true, TestHelper.compareBags(dbfrj, dbshj));
    }

    @Test
    public void testSkewedJoinOuter() throws IOException {
        pigServer.registerQuery("A = LOAD '" + SKEW_INPUT_FILE5 + "' as (id,name);");
        pigServer.registerQuery("B = LOAD '" + SKEW_INPUT_FILE5 + "' as (id,name);");
        try {
            DataBag dbfrj = BagFactory.getInstance().newDefaultBag();
            {
                pigServer.registerQuery("C = join A by id left, B by id using 'skewed';");
                Iterator<Tuple> iter = pigServer.openIterator("C");

                while(iter.hasNext()) {
                    dbfrj.add(iter.next());
                }
            }
            {
                pigServer.registerQuery("C = join A by id right, B by id using 'skewed';");
                Iterator<Tuple> iter = pigServer.openIterator("C");

                while(iter.hasNext()) {
                    dbfrj.add(iter.next());
                }
            }
            {
                pigServer.registerQuery("C = join A by id full, B by id using 'skewed';");
                Iterator<Tuple> iter = pigServer.openIterator("C");

                while(iter.hasNext()) {
                    dbfrj.add(iter.next());
                }
            }
        } catch(Exception e) {
            System.out.println(e.getMessage());
            e.printStackTrace();
            fail("Should support outer join in skewed join");
        }
        return;
    }
}