/*
 * 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 static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

import org.apache.commons.io.FileUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.pig.PigServer;
import org.apache.pig.backend.executionengine.ExecJob;
import org.apache.pig.backend.hadoop.executionengine.HExecutionEngine;
import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan;
import org.apache.pig.impl.PigContext;
import org.apache.pig.impl.util.ObjectSerializer;
import org.apache.pig.newplan.logical.relational.LogicalPlan;
import org.apache.pig.tools.pigstats.PigStats;
import org.junit.Ignore;
import org.junit.Test;

@Ignore
abstract public class TestPigStats  {

    protected static final Log LOG = LogFactory.getLog(TestPigStats.class);

    abstract public void addSettingsToConf(Configuration conf, String scriptFileName) throws IOException;

    @Test
    public void testPigScriptInConf() throws Exception {
        PrintWriter w = new PrintWriter(new FileWriter("test.pig"));
        w.println("register /mydir/sath.jar");
        w.println("register /mydir/lib/hadoop-tools-0.20.201.0-SNAPSHOT.jar");
        w.println("register /mydir/lib/jackson-core-asl-1.4.2.jar");
        w.println("register /mydir/lib/jackson-mapper-asl-1.4.2.jar");
        w.close();

        Configuration conf = new Configuration();
        addSettingsToConf(conf, "test.pig");

        String s = conf.get("pig.script");
        String script = (String) ObjectSerializer.deserialize(s);

        String expected =
            "register /mydir/sath.jar\n" +
            "register /mydir/lib/hadoop-tools-0.20.201.0-SNAPSHOT.jar\n" +
            "register /mydir/lib/jackson-core-asl-1.4.2.jar\n"  +
            "register /mydir/lib/jackson-mapper-asl-1.4.2.jar\n";

        assertEquals(expected, script);
    }

    @Test
    public void testJythonScriptInConf() throws Exception {
        String[] script = {
                "#!/usr/bin/python",
                "from org.apache.pig.scripting import *",
                "Pig.fs(\"rmr simple_out\")",
                "input = 'simple_table'",
                "output = 'simple_out'",
                "P = Pig.compile(\"\"\"a = load '$input';store a into '$output';\"\"\")",
                "Q = P.bind({'input':input, 'output':output})",
                "stats = Q.runSingle()",
                "if stats.isSuccessful():",
                "\tprint 'success!'",
                "else:",
                "\traise 'failed'"
        };

        Util.createLocalInputFile( "testScript.py", script);

        Configuration conf = new Configuration();
        addSettingsToConf(conf, "testScript.py");

        String s = conf.get("pig.script");
        String actual = (String) ObjectSerializer.deserialize(s);

        String expected =
            "#!/usr/bin/python\n" +
            "from org.apache.pig.scripting import *\n" +
            "Pig.fs(\"rmr simple_out\")\n" +
            "input = 'simple_table'\n" +
            "output = 'simple_out'\n" +
            "P = Pig.compile(\"\"\"a = load '$input';store a into '$output';\"\"\")\n" +
            "Q = P.bind({'input':input, 'output':output})\n" +
            "stats = Q.runSingle()\n" +
            "if stats.isSuccessful():\n" +
            "\tprint 'success!'\n" +
            "else:\n" +
            "\traise 'failed'\n";

        assertEquals(expected, actual);
    }

    @Test
    public void testBytesWritten_JIRA_1027() throws Exception {

        File outputFile = null;
        try {
            String fileName = this.getClass().getName() + "_" + "testBytesWritten_JIRA_1027";
            outputFile = File.createTempFile(fileName, ".out");
            String filePath = outputFile.getAbsolutePath();
            outputFile.delete();
            PigServer pig = new PigServer(Util.getLocalTestMode());
            pig.registerQuery("A = load 'test/org/apache/pig/test/data/passwd';");
            ExecJob job = pig.store("A", filePath);
            PigStats stats = job.getStatistics();
            File dataFile = Util.getFirstPartFile(outputFile);
            // This check fails in MR due to lack of counters in local mode
            assertEquals(dataFile.length(), stats.getBytesWritten());
        } catch (IOException e) {
            LOG.error("Error while generating file", e);
            fail("Encountered IOException");
        } finally {
            if (outputFile != null) {
                // Hadoop Local mode creates a directory
                // Hence we need to delete a directory recursively
                deleteDirectory(outputFile);
            }
        }
    }

    abstract public void checkPigStatsAlias(PhysicalPlan pp, PigContext pc) throws Exception;

    @Test
    public void testPigStatsAlias() throws Exception {
        try {
            PigServer pig = new PigServer(Util.getLocalTestMode());
            pig.setBatchOn();
            pig.registerQuery("A = load 'input' as (name, age, gpa);");
            pig.registerQuery("B = group A by name;");
            pig.registerQuery("C = foreach B generate group, COUNT(A);");
            pig.registerQuery("D = order C by $1;");
            pig.registerQuery("E = limit D 10;");
            pig.registerQuery("store E into 'alias_output';");

            LogicalPlan lp = getLogicalPlan(pig);
            lp.optimize(pig.getPigContext());
            PhysicalPlan pp = ((HExecutionEngine)pig.getPigContext().getExecutionEngine()).compile(lp,
                    null);
            checkPigStatsAlias(pp, pig.getPigContext());
        } finally {
            File outputfile = new File("alias_output");
            if (outputfile.exists()) {
                // Hadoop Local mode creates a directory
                // Hence we need to delete a directory recursively
                deleteDirectory(outputfile);
            }
        }
    }

    abstract public void checkPigStats(ExecJob job);

    @Test
    public void testPigStatsGetList() throws Exception {
        File outputFile = null;
        try {
            String filename = this.getClass().getSimpleName() + "_" + "testPigStatsGetList";
            outputFile = File.createTempFile(filename, ".out");
            String filePath = outputFile.getAbsolutePath();
            outputFile.delete();
            PigServer pigServer = new PigServer(Util.getLocalTestMode());
            pigServer.registerQuery("a = load 'test/org/apache/pig/test/data/passwd';");
            pigServer.registerQuery("b = group a by $0;");
            pigServer.registerQuery("c = foreach b generate group, COUNT(a) as cnt;");
            pigServer.registerQuery("d = group c by cnt;");
            pigServer.registerQuery("e = foreach d generate group;");
            ExecJob job = pigServer.store("e", filePath);
            checkPigStats(job);
        } catch (IOException e) {
            LOG.error("IOException while creating file ", e);
            fail("Encountered IOException");
        } finally {
            if (outputFile != null) {
                // delete the directory before returning
                deleteDirectory(outputFile);
            }
        }
    }

    private void deleteDirectory(File dir) {
        try {
            FileUtils.deleteDirectory(dir);
        } catch (IOException e) {
            LOG.error("Could not delete directory " + dir, e);
        }
    }

    public static LogicalPlan getLogicalPlan(PigServer pig) throws Exception {
        java.lang.reflect.Method buildLp = pig.getClass().getDeclaredMethod("buildLp");
        buildLp.setAccessible(true);
        return (LogicalPlan ) buildLp.invoke( pig );
    }

}