/*
 * 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.pigmix.mapreduce;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.Map;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.KeyValueTextInputFormat;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.TextInputFormat;
import org.apache.hadoop.mapred.jobcontrol.Job;
import org.apache.hadoop.mapred.jobcontrol.JobControl;
import org.apache.hadoop.mapred.lib.IdentityMapper;

import org.apache.pig.test.pigmix.mapreduce.Library;

public class L5 {

    public static class ReadPageViews extends MapReduceBase
        implements Mapper<LongWritable, Text, Text, Text> {

        public void map(
                LongWritable k,
                Text val,
                OutputCollector<Text, Text> oc,
                Reporter reporter) throws IOException {

            // Pull the key out
            List<Text> line = Library.splitLine(val, '');
            // Prepend an index to the value so we know which file
            // it came from.
            oc.collect(line.get(0), new Text("1"));
        }
    }

    public static class ReadUsers extends MapReduceBase
        implements Mapper<LongWritable, Text, Text, Text> {

        public void map(
                LongWritable k,
                Text val,
                OutputCollector<Text, Text> oc,
                Reporter reporter) throws IOException {

            // Pull the key out
            List<Text> line = Library.splitLine(val, '');
            // Prepend an index to the value so we know which file
            // it came from.
            oc.collect(line.get(0), new Text("2"));
        }
    }

    public static class Join extends MapReduceBase
        implements Reducer<Text, Text, Text, Text> {

        public void reduce(
                Text key,
                Iterator<Text> iter, 
                OutputCollector<Text, Text> oc,
                Reporter reporter) throws IOException {
            // For each value, figure out which file it's from and store it
            // accordingly.
            int cnt = 0;

            while (iter.hasNext()) {
		//As soon as a value for that name appears in the 'users' table, exclude the tuple by a return
                if (iter.next().toString().charAt(0) == '2') return;
		reporter.setStatus("OK");
            }

	    oc.collect(null, key);
	    reporter.setStatus("OK");
	   
        }
    }

    public static void main(String[] args) throws IOException {

        if (args.length!=3) {
            System.out.println("Parameters: inputDir outputDir parallel");
            System.exit(1);
        }
        String inputDir = args[0];
        String outputDir = args[1];
        String parallel = args[2];
        String user = System.getProperty("user.name");
        JobConf lp = new JobConf(L5.class);
        lp.setJobName("L5 Load Page Views");
        lp.setInputFormat(TextInputFormat.class);
        lp.setOutputKeyClass(Text.class);
        lp.setOutputValueClass(Text.class);
        lp.setMapperClass(ReadPageViews.class);
        Properties props = System.getProperties();
        for (Map.Entry<Object,Object> entry : props.entrySet()) {
            lp.set((String)entry.getKey(), (String)entry.getValue());
        }
        FileInputFormat.addInputPath(lp, new Path(inputDir + "/page_views"));
        FileOutputFormat.setOutputPath(lp, new Path(outputDir + "/indexed_pages_5"));
        lp.setNumReduceTasks(0);
        Job loadPages = new Job(lp);

        JobConf lu = new JobConf(L5.class);
        lu.setJobName("L5 Load Users");
        lu.setInputFormat(TextInputFormat.class);
        lu.setOutputKeyClass(Text.class);
        lu.setOutputValueClass(Text.class);
        lu.setMapperClass(ReadUsers.class);
        props = System.getProperties();
        for (Map.Entry<Object,Object> entry : props.entrySet()) {
            lu.set((String)entry.getKey(), (String)entry.getValue());
        }
        FileInputFormat.addInputPath(lu, new Path(inputDir + "/users"));
        FileOutputFormat.setOutputPath(lu, new Path(outputDir + "/indexed_users_5"));
        lu.setNumReduceTasks(0);
        Job loadUsers = new Job(lu);

        JobConf join = new JobConf(L5.class);
        join.setJobName("L5 Join Users and Pages");
        join.setInputFormat(KeyValueTextInputFormat.class);
        join.setOutputKeyClass(Text.class);
        join.setOutputValueClass(Text.class);
        join.setMapperClass(IdentityMapper.class);
        join.setReducerClass(Join.class);
        props = System.getProperties();
        for (Map.Entry<Object,Object> entry : props.entrySet()) {
            join.set((String)entry.getKey(), (String)entry.getValue());
        }
        FileInputFormat.addInputPath(join, new Path(outputDir + "/indexed_pages_5"));
        FileInputFormat.addInputPath(join, new Path(outputDir + "/indexed_users_5"));
        FileOutputFormat.setOutputPath(join, new Path(outputDir + "/L5out"));
        join.setNumReduceTasks(Integer.parseInt(parallel));
        Job joinJob = new Job(join);
        joinJob.addDependingJob(loadPages);
        joinJob.addDependingJob(loadUsers);

        JobControl jc = new JobControl("L5 join");
        jc.addJob(loadPages);
        jc.addJob(loadUsers);
        jc.addJob(joinJob);

        new Thread(jc).start();
   
        int i = 0;
        while(!jc.allFinished()){
            ArrayList<Job> failures = jc.getFailedJobs();
            if (failures != null && failures.size() > 0) {
                for (Job failure : failures) {
                    System.err.println(failure.getMessage());
                }
                break;
            }

            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {}

            if (i % 10000 == 0) {
                System.out.println("Running jobs");
                ArrayList<Job> running = jc.getRunningJobs();
                if (running != null && running.size() > 0) {
                    for (Job r : running) {
                        System.out.println(r.getJobName());
                    }
                }
                System.out.println("Ready jobs");
                ArrayList<Job> ready = jc.getReadyJobs();
                if (ready != null && ready.size() > 0) {
                    for (Job r : ready) {
                        System.out.println(r.getJobName());
                    }
                }
                System.out.println("Waiting jobs");
                ArrayList<Job> waiting = jc.getWaitingJobs();
                if (waiting != null && waiting.size() > 0) {
                    for (Job r : ready) {
                        System.out.println(r.getJobName());
                    }
                }
                System.out.println("Successful jobs");
                ArrayList<Job> success = jc.getSuccessfulJobs();
                if (success != null && success.size() > 0) {
                    for (Job r : ready) {
                        System.out.println(r.getJobName());
                    }
                }
            }
            i++;
        }
        ArrayList<Job> failures = jc.getFailedJobs();
        if (failures != null && failures.size() > 0) {
            for (Job failure : failures) {
                System.err.println(failure.getMessage());
            }
        }
        jc.stop();
    }

}