package MyMapReduce;   // change package name based on your project

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.IntWritable;

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;

public class MainDriver {

    // ------------------ MAPPER TEMPLATE (Always same structure) --------------------
    public static class MyMapper extends Mapper<LongWritable, Text, Text, IntWritable> {

        protected void map(LongWritable key, Text value, Context context)
                throws IOException, InterruptedException {

            // ******** WRITE YOUR MAPPER LOGIC HERE **********
        }
    }

    // ------------------ REDUCER TEMPLATE (Always same structure) -------------------
    public static class MyReducer extends Reducer<Text, IntWritable, Text, IntWritable> {

        
        protected void reduce(Text key, Iterable<IntWritable> values, Context context)
                throws IOException, InterruptedException {

            // ******** WRITE YOUR REDUCER LOGIC HERE **********
        } 
    }

    // -------------------------- MAIN METHOD (COMMON ALWAYS) --------------------------
    public static void main(String[] args) throws Exception {

        if (args.length != 2) {
            System.err.println("Usage: <Input Path> <Output Path>");
            System.exit(-1);
        }

        Configuration conf = new Configuration();
        Job job = Job.getInstance(conf, "My MapReduce Job");

        job.setJarByClass(MainDriver.class);
        job.setMapperClass(MyMapper.class);
        job.setReducerClass(MyReducer.class);

        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);

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

        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
}