import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.text.DecimalFormat;
import java.text.NumberFormat;

public class source {
	
	long num_of_lines = 0;
	long num_of_files = 0;
	String filetype;
	long num_of_filesize;
	
	public source( String path, String filetype ) {
		if( !filetype.startsWith(".") ){
			filetype = "." + filetype;
		}
		this.filetype = filetype;
		
		displayFiles(path);
		
		NumberFormat nf = new DecimalFormat("# ###,###");
		
		System.out.println("Filetype: " + filetype.substring(1) );
		System.out.println("Files: " + nf.format( num_of_files ) );
		System.out.println("Code lines: " + nf.format( num_of_lines ) );
		System.out.println("Average: " + nf.format( num_of_lines/num_of_files) );
		System.out.println("Files size: " + nf.format( ( num_of_filesize  ) ) + "b" );
		System.out.println();
		
	}

	public void displayFiles( String path ){
		//novy soubor
		File file = new File(path);
		//list souboru z otevreneho adresare
		String[] files = file.list();
		//projdeme vsechny soubory
		for (int i = 0; files != null && i < files.length; i++) {
			//vytvorime novy File
			File f = new File(path + "\\" + files[i]);
			//pokud se jedna o adresar, rekurzivne volame
			if( f.isDirectory() ){
				displayFiles(path + "\\" + files[i] );
			}
			else{
				//pokud soubor obsahuje spravnou priponu
				if( files[i].endsWith(filetype) ){
					FileReader fr = null;
					try {
						//novy FileReader
						fr = new FileReader( f );
					} catch (FileNotFoundException e) {
						e.printStackTrace();
					}
					//zjistime pocet radek
					LineNumberReader ln = new LineNumberReader(fr);
					int count = 0;
					
					try {
						while (ln.readLine() != null)
							count++;
					} catch (IOException e) {
						e.printStackTrace();
					}					
					//pripocteme potrebne hodnoty
					num_of_lines+=count;
					num_of_files++;
					num_of_filesize += f.length();
				}
			}
		}
	}

	public static void main(String[] args) {
		String path = new String("c:\\www\\www");
		new source(path,"php");
		
		path = new String("c:\\java\\www");
		new source(path,"java");
		
		path = new String("c:\\cproj");
		new source(path,"cpp");
		
	}

}