import java.io.*;
import java.util.*;
import java.net.*;

public class WebSurveyor {
    
// Initialize a WebSurveyor object capable of giving a set of WebPages reachable 
//      from startingUrl all on the site defined by siteString
     public WebSurveyor(String startingUrl, String siteString) 
                                           throws IOException 
     {
	 wpList = new Set();
	 urlList = new Set();
	 if (startingUrl.indexOf(siteString) == -1)
	     return;
	 WebPage wp = new WebPage(startingUrl); 
	 wpList.addElement(wp);
	 urlList.addElement(startingUrl);
	 survey(wp,siteString);
	 
     }
    
// Examine the web pages of the site defined by siteString and reachable from the 
// web page wp
    private void survey(WebPage wp, String siteString) throws IOException {
	Set links = wp.getLinks();
	Enumeration e = links.elements();
	while (e.hasMoreElements()) {
	    String url = (String) e.nextElement();
	    if (url.indexOf(siteString)!=-1 && !urlList.contains(url)) {
		WebPage wp2 = new WebPage(url);
		urlList.addElement(url);
		if (!wp2.isBad()) { 
		    wpList.addElement(wp2);
		    survey(wp2,siteString);
		}
	    }
	}
    }
    
    Set getPages() {
	return wpList;
    }
    
    private Set wpList;// set of existing web pages whose URLs contain 
	               // the siteString and that are reachable from 
                       // the initial URL given to WebSurveyor
		
    private Set urlList;// set of URLs good or bad that have already 
                        // been surveyed
    private static void showBad(WebPage wp, Set badset) {
	System.out.println("Bad pages of "+wp.getURL()+":");
	Enumeration ebad = badset.elements();
	while (ebad.hasMoreElements())
	    System.out.println(ebad.nextElement());
    }
    
    public static void main(String[] args) throws IOException {
	String startingUrl = args[0];
	String siteString = args[1];
	WebSurveyor ws = new WebSurveyor(startingUrl,siteString);
	Set pset = ws.getPages();
	Enumeration e = pset.elements();
	while (e.hasMoreElements()) { 
	    WebPage wp = (WebPage) e.nextElement();
	    Set badset = wp.getBadLinks();
	    if (!badset.isEmpty()) 
		showBad(wp,badset);
	}
    }
}