package ests;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class SeqExtractor2 {
	
	public static void main(String[] args) throws IOException {
	
		
		final double COPYTHRESH = 0.2f; 
		
		String infile = args[0];
		int seqsneeded = Integer.parseInt(args[1]);
		int seqs=0;
		
		boolean copymode=false;
		while (seqs<seqsneeded) {
		
			// open file
			BufferedReader reader = new BufferedReader(new FileReader(infile));
			
			// read line-by-line
			String line;
			while ((line = reader.readLine()) != null) {
				if (line.length() > 0 && line.charAt(0) == '>') {
					// randomly activate copy mode
					if (Math.random() < COPYTHRESH) {
						copymode = true;
						seqs++;
					}
					else 
						copymode = false;
					
					
					if (seqs>seqsneeded) break;
				}
				if (copymode)
					System.out.println(line);
			}
			
			reader.close();
		}
	}
	
}