package driver;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;


public class MoveFiles {
	
	
	public static void main(String[] args){
		
		String root=args[0].replace('\\', '/');
		
		File dir=new File(root);
		assert(dir.exists());
		assert(dir.isDirectory());

		
		File[] files=dir.listFiles();
		
		for(int chrom=1; chrom<=22; chrom++){
			
			String key="chr"+chrom;
			
			File dest=new File(root+"/"+key);
			if(!dest.exists()){
				dest.mkdir();
			}
			
			for(File f : files){
				String name=f.getName();
				if(name.contains("/")){
					name=name.substring(name.lastIndexOf("/")+1);
				}
				final String name2=name;
				
				if(name.contains(".")){
					name=name.substring(0,name.lastIndexOf("."));
				}
				
				while(name.length()>1 && !Character.isDigit(name.charAt(name.length()-1))){
					name=name.substring(0, name.length()-1);
				}
				name=name.toLowerCase();
				
				if(f.isFile() && name.endsWith("chr"+chrom)){
					copyFile(f.getAbsolutePath(), dest.getAbsolutePath()+"/"+name2);
				}
			}
		}
		
	}

	
	/**
	 * @param srFile
	 * @param dtFile
	 * {@link from http://www.roseindia.net/java/beginners/CopyFile.shtml}
	 */
	private static void copyFile(String src, String dst){
//		assert(false) : src+" -> "+dst;
		try{
			File f1 = new File(src);
			File f2 = new File(dst);
			InputStream in = new FileInputStream(f1);
			//For Append the file.
			//	      OutputStream out = new FileOutputStream(f2,true);

			//For Overwrite the file.
			OutputStream out = new FileOutputStream(f2);

			byte[] buf = new byte[16384];
			int len;
			while ((len = in.read(buf)) > 0){
				out.write(buf, 0, len);
			}
			in.close();
			out.close();
		}catch(FileNotFoundException e){
			throw new RuntimeException(e);
		}catch(IOException e){
			throw new RuntimeException(e);
		}
	}
	
	
}
