package grayscalefromfile_exc;

import java.io.IOException;
import java.io.FileInputStream;
import java.io.File;
import java.util.List;
import java.util.Arrays;
import java.util.Iterator;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
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.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.util.GenericOptionsParser;

import hipi.imagebundle.mapreduce.ImageBundleInputFormat;


public class StubDriver extends Configured implements Tool {
	public int run(String[] args) throws Exception {
		
		Configuration conf = new Configuration();
		String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
		
		System.out.println("num of args: " + args.length + ":" + args[0] + "," + args[1]);
		
		if (args.length != 2) {
			System.out.println("Usage: dumphib <input hib> <outputdir>");
			System.exit(0);
		}
		String inputPath = args[0];
		String outputPath = args[1];
		
		Job job = new Job(conf);
		job.setJobName("grayscalefromfile_exc");

		job.setJarByClass(StubDriver.class);
		job.setMapperClass(StubMapper.class);
		job.setReducerClass(StubReducer.class);

		// Set formats
		job.setOutputKeyClass(IntWritable.class);
		job.setOutputValueClass(Text.class);
		job.setInputFormatClass(ImageBundleInputFormat.class);

		// Set out/in paths
		removeDir(outputPath, conf);
		FileOutputFormat.setOutputPath(job, new Path(outputPath));
		FileInputFormat.setInputPaths(job, new Path(inputPath));	

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

	}

	public static void main(String[] args) throws Exception {
		int exitCode = ToolRunner.run(new StubDriver(), args);
		System.exit(exitCode);
	}

	public static void removeDir(String path, Configuration conf) throws IOException {
		Path output_path = new Path(path);

		FileSystem fs = FileSystem.get(conf);

		if (fs.exists(output_path)) {
			fs.delete(output_path, true);
		}
	}
}