import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.hadoop.io.NullWritable;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import java.util.StringTokenizer;

// >>> Don't Change
public class WHV1 extends Configured implements Tool {
    public static void main(String[] args) throws Exception {
        int res = ToolRunner.run(new Configuration(), new WHV1(), args);
        System.exit(res);
    }

    @Override
    public int run(String[] args) throws Exception {
        Job job = Job.getInstance(this.getConf(), "WH1");
        job.setOutputKeyClass(NullWritable.class);
        job.setOutputValueClass(Text.class);

        job.setMapOutputKeyClass(NullWritable.class);
        job.setMapOutputValueClass(Text.class);

        job.setMapperClass(TitleCountMap.class);
        job.setReducerClass(TitleCountReduce.class);

        FileInputFormat.setInputPaths(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));

        job.setJarByClass(WHV1.class);
        return job.waitForCompletion(true) ? 0 : 1;
    }


    public static class TitleCountMap extends Mapper<Object, Text, NullWritable, Text> {
        List<String> stopWords;
        String delimiters;

        

        @Override
        public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
            String[] line = value.toString().split(",");
            if((!line[6].equals("")&(!line[11].equals("")))){
                context.write(NullWritable.get(),value);
            }
        }
    }

    public static class TitleCountReduce extends Reducer<NullWritable, Text, NullWritable, Text> {
        private double percentage;
        @Override
        protected void setup(Context context) throws IOException,InterruptedException {
            Configuration conf = context.getConfiguration();
            this.percentage = conf.getDouble("percentage", 1);
        }
        @Override
        public void reduce(NullWritable key, Iterable<Text> values, Context context)
                throws IOException, InterruptedException {
            Random temp = new Random();
            for (Text val : values) {
                if(percentage>temp.nextDouble()){
                    context.write(key, new Text(val));
                }
            }
        }
    }
}