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

/**
 *  This type represents a reference to a link folder.
 *  This is a concept where the links in a web page
 *  are treated as if they were members of a folder.
 *
 *  @see FaqItem, Question, Answer
 *  @author http://bumble.sf.net
 */
 
  
public class LinkFolder extends Object
{
  //--------------------------------------------
  private static String NEWLINE = System.getProperty("line.separator");
  //--------------------------------------------
  private boolean isGood;
  //--------------------------------------------
  private String errors;
  //--------------------------------------------
  private String linkPage;
  //--------------------------------------------
  public static String INDICATOR = "[webdir";
  //--------------------------------------------
  public static String TERMINATOR = "]";

  public LinkFolder()
  {
    this.errors = "";
    this.linkPage = "";
  } 

  //--------------------------------------------
  public LinkFolder(String sText)
  {
    this();
    this.loadData(sText);
  } 

  //--------------------------------------------
  public String getAbsoluteName()
  {
    if (!this.isGood)
     { return ""; }

    return this.linkPage;
  }

  //--------------------------------------------
  public String getCanonicalName()
  {
    return "";
  }

  //--------------------------------------------
  public String getLinkPage()
  {
    return this.linkPage;
  }

  //--------------------------------------------
  public void setLinkPage(String sLinkPage)
  {
    this.linkPage = sLinkPage;
  }

  //--------------------------------------------
  public void loadData(String sText)
  {
    this.isGood = this.isLinkFolder(sText);
    if (!this.isGood)
    {
      return;
    }

    this.linkPage = sText.trim().substring(
      this.INDICATOR.length(),
      sText.trim().length() - this.TERMINATOR.length()).trim();

    if (this.linkPage.equals(""))
    {
      this.linkPage = ".";
    }

  } //-- m: loadData()

  //--------------------------------------------
  /** checks if this looks like a LinkFolder indicator */
  public static boolean isLinkFolder(String sText)
  {
    if (sText.trim().length() == 0)
     { return false; }

    if (!sText.trim().startsWith(LinkFolder.INDICATOR))
      { return false; }

    if (!sText.trim().endsWith(LinkFolder.TERMINATOR))
      { return false; }

    return true;
  }

  
  //--------------------------------------------
  /** creates a string suitable for a plain text doc */
  public String toString()
  {
    StringBuffer sbReturn = new StringBuffer("");

    sbReturn.append(this.INDICATOR);
    sbReturn.append(" ");
    sbReturn.append(this.linkPage.toString());
    sbReturn.append(this.TERMINATOR);

    return sbReturn.toString();
  }

  //--------------------------------------------
  public String printHtml()
  {
    if (!this.isGood)
    {
      return "";
    }

  
    StringBuffer sbReturn = new StringBuffer("");
    ReferenceDocument document;
    InputStreamReader stream;
    URL urlLinkPage;
    Reference[] rrLinks;

    try
    {
      urlLinkPage = new URL(this.linkPage);
    }
    catch (MalformedURLException e)
    {
      return "";
    }

    try
    {
      stream = new InputStreamReader(urlLinkPage.openStream());
    }
    catch (IOException e)
    {
      return "";
    }

    document = new ReferenceDocument(stream);
    rrLinks = document.getReferences();     
    //return document.toString();


    Reference rCurrentLink = new Reference();
    String sDisplayName = new String();
    String sName = new String();

    sbReturn.append("<ul class='web-dir-list'>");

    for (int ii = 0; ii < rrLinks.length; ii++)
    {
      rCurrentLink = rrLinks[ii];

      sbReturn.append("<li class='web-dir-item'><a href='");
      sbReturn.append(rCurrentLink.getPointer());
      sbReturn.append("'>");

      sbReturn.append(Html.encode(rCurrentLink.getPointer()));
      sbReturn.append("</a></li>");
      sbReturn.append(NEWLINE);

    } //-- for
    sbReturn.append("</ul>");
    return sbReturn.toString();

  } //-- m: printHtml()

  //--------------------------------------------
  public String printReport()
  {
    StringBuffer sbReturn = new StringBuffer("");
    sbReturn.append("");
    sbReturn.append(NEWLINE);
    sbReturn.append("Link page name   >");
    sbReturn.append(this.linkPage);
    sbReturn.append(NEWLINE);
    sbReturn.append("Absolute name    >");
    sbReturn.append(this.getAbsoluteName());
    sbReturn.append(NEWLINE);
    sbReturn.append("last data good   >");
    sbReturn.append(this.isGood);
    sbReturn.append(NEWLINE);
    sbReturn.append("error messages   >");
    sbReturn.append(this.errors);
    sbReturn.append(NEWLINE);
    return sbReturn.toString();
  }

  //--------------------------------------------
  public String print()
  {
    StringBuffer sbReturn = new StringBuffer("");
    return this.toString();
  }


  //--------------------------------------------
  /** a main method for testing */
  public static void main(String[] args) throws Exception
  {

    StringBuffer sbUsageMessage = new StringBuffer("");
    sbUsageMessage.append("test usage: java LinkFolder link-page-text");
    sbUsageMessage.append(NEWLINE);
    sbUsageMessage.append(NEWLINE);

    if (args.length == 0)
    {	    
      System.out.println(sbUsageMessage);
      System.exit(-1);
    }

    StringBuffer sbTest = new StringBuffer("");

    LinkFolder dirTest = new LinkFolder(args[0]);
    System.out.println(".printHtml()");
    System.out.println(dirTest.printHtml());
    System.out.println(".toString()");
    System.out.println(dirTest.toString());
    System.out.println(".printReport()");
    System.out.println(dirTest.printReport());

  } //-- main()
  
} //-- FAQ class