/*
 * 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.FileOutputStream;
import java.util.Iterator;
import java.util.Random;
import java.util.zip.GZIPOutputStream;
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;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.builtin.DIFF;
import org.apache.pig.data.BagFactory;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.Tuple;
import org.apache.pig.test.utils.TestHelper;

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

@RunWith(JUnit4.class)
public class TestCompressedFiles extends TestCase {
    
    private final Log log = LogFactory.getLog(getClass());
    static MiniCluster cluster = MiniCluster.buildCluster();

    File datFile;
    File gzFile;
    @Override
    @Before
    public void setUp() throws Exception {
        datFile = File.createTempFile("compTest", ".dat");
        gzFile = File.createTempFile("compTest", ".gz");
        FileOutputStream dat = new FileOutputStream(datFile);
        GZIPOutputStream gz = new GZIPOutputStream(new FileOutputStream(gzFile));
        Random rand = new Random();
        for(int i = 0; i < 1024; i++) {
            StringBuffer sb = new StringBuffer();
            int x = rand.nextInt();
            int y = rand.nextInt();
            sb.append(x);
            sb.append('\t');
            sb.append(y);
            sb.append('\n');
            byte bytes[] = sb.toString().getBytes();
            dat.write(bytes);
            gz.write(bytes);
        }
        dat.close();
        gz.close();
    }

    @Override
    @After
    public void tearDown() throws Exception {
        datFile.delete();
        gzFile.delete();
    }
    
    @AfterClass
    public static void oneTimeTearDown() throws Exception {
        cluster.shutDown();
    }
    
    @Test
    public void testCompressed1() throws Throwable {
        PigServer pig = new PigServer(ExecType.MAPREDUCE, cluster.getProperties());
        pig.registerQuery("A = foreach (cogroup (load '"
                + Util.generateURI(gzFile.toString(), pig.getPigContext())
                + "') by $1, (load '"
                + Util.generateURI(datFile.toString(), pig.getPigContext())
                + "') by $1) generate flatten( " + DIFF.class.getName()
                + "($1.$1,$2.$1)) ;");
        Iterator<Tuple> it = pig.openIterator("A");
        boolean success = true;
        while(it.hasNext()) {
            success = false;
            log.info(it.next());
        }
        assertTrue(success);
    }
    
    @Test
    public void testCompressed2() throws Throwable {
        PigServer pig = new PigServer(ExecType.MAPREDUCE, cluster.getProperties());
        pig.registerQuery("A = load '"
                + Util.generateURI(gzFile.toString(), pig.getPigContext())
                + "';");
 
        DataBag dbGz = BagFactory.getInstance().newDefaultBag(), dbDt = BagFactory.getInstance().newDefaultBag();
        {
            Iterator<Tuple> iter = pig.openIterator("A");

            while(iter.hasNext()) {
                dbGz.add(iter.next());
            }            
        }
        pig.registerQuery("B = load '"        
                + Util.generateURI(datFile.toString(), pig.getPigContext())
                + "';");
        Iterator<Tuple> iter = pig.openIterator("B");

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