/*
 * PRCalculator.java
 *
 * Created on den 9 oktober 2002, 14:49
 */

import java.util.*;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;

/**
 *
 * @author  h&m
 */
public class PRCalculator {
    Map pages = new TreeMap();
    private boolean printIterations;
    private PageRank pageRanker = null;
    
    /** Creates a new instance of Test */
    public PRCalculator() {
    }
    
    /** Creates a new instance of PRCalculator */
    public PRCalculator(boolean printIterations, String XMLfile) {
        this.printIterations = printIterations;
        String xmlFile = "file:///xerces-4_0_5/data/personal.xml"; 
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document document = builder.parse(XMLfile);
            if(! document.getDoctype().getSystemId().equals("http://www.dsv.su.se/~henrik-j/star66/Pages.dtd")) {
                System.err.println(XMLfile + " måste använda http://www.dsv.su.se/~henrik-j/star66/Pages.dtd");
                System.exit(2);
            }
            PagesScanner ps = new PagesScanner(this, document);
            ps.visitDocument();
        }
        catch (FactoryConfigurationError e) {
            System.err.println("unable to get a document builder factory");
        } 
        catch (ParserConfigurationException e) {
            System.err.println("parser was unable to be configured");
        }
        catch (SAXException e) {
            System.err.println("parsing error");
        } 
        catch (IOException e) {
            System.err.println("i/o error");
        }
    }
    
    public int getIterations() {
        return pageRanker.getIterations();
    }
    
    public String toString() {
        String tmp = new String();
        Iterator iter = pages.values().iterator();
        while(iter.hasNext())
            tmp += ((Page) iter.next()).toString() + "  ";
        return tmp;
    }
    
    public void calculatePR() {
        pageRanker = new PageRank(printIterations);
        pageRanker.addPages(pages.values()).calculatePR();
    }
    
    public void addPage(String name) {
        pages.put(name, new Page(name));
    }
    
    public void addIncomingPage(String from, String to) {
        ((Page) pages.get(from)).incOutgoing();
        ((Page) pages.get(to)).addIngoing((Page) pages.get(from)); //ingoing.add(pages.get(from));
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        if(args.length == 0) {
            System.out.println("Användning: PRCalculator [-noPrint | -np] <XML-fil>");
            System.exit(1); 
        } else {
            boolean printIter = true;
            String file = null;
            for(int i = 0; i < args.length; i++) {
                if(args[i].equals("-noPrint") || args[i].equals("-np"))
                    printIter = false;
                else if(args[i].equals("-?") || args[i].equals("-h")) {
                    System.out.println("Användning: PRCalculator [-noPrint | -np] <XML-fil>");
                    System.exit(0); 
                } else
                    file = args[i];
            }
            
            if(file != null) {
                PRCalculator prc = new PRCalculator(printIter, file);
                prc.calculatePR();
                System.out.println("\nAntal iterationer: " + prc.getIterations());
                System.out.println("\nResultat:\n" + prc.toString());
            } else {
                System.err.println("inget filnamn medskickat");
                System.exit(3);
            }
        }
        System.exit(0);
    }
    
}