// LabelBureauFrame.java
// $Id: LabelBureauFrame.java,v 1.6 2000/08/16 21:37:43 ylafon Exp $
// (c) COPYRIGHT MIT and INRIA, 1998.
// Please first read the full copyright statement in file COPYRIGHT.html

package org.w3c.jigsaw.pics ;

import org.w3c.tools.resources.FramedResource;
import org.w3c.tools.resources.ProtocolException;

import org.w3c.www.http.HTTP;

import org.w3c.jigsaw.http.HTTPException;
import org.w3c.jigsaw.http.Reply;
import org.w3c.jigsaw.http.Request;

import org.w3c.jigsaw.forms.URLDecoder;
import org.w3c.jigsaw.forms.URLDecoderException;

import org.w3c.jigsaw.frames.HTTPFrame;
import org.w3c.jigsaw.frames.PostableFrame;

/**
 * @version $Revision: 1.6 $
 * @author  Benoît Mahé (bmahe@w3.org)
 */
public class LabelBureauFrame extends PostableFrame {

    protected LabelBureauResource labelb = null;

    /**
     * Register our resource. Must be an instance of ServletWrapper.
     */
    public void registerResource(FramedResource resource) {
	super.registerOtherResource(resource);
	if (resource instanceof LabelBureauResource)
	    labelb = (LabelBureauResource) resource;
    }

    /**
     * Parse the URLs given in the URLDecoder, as the <strong>u</strong> field.
     * This method just unquote any quoted URLs, before sending them back.
     * @param data The URLDecoder to get data from.
     * @return An array of String, properly parsed.
     */

    protected String[] parseURLs (String us[]) {
	//FIXME .... no FIX IE!
	if (us[0] == null)
	    return null;
	String urls[] = new String[us.length] ;
	for (int i = 0 ; i < us.length ; i++) {
	    if ( us[i].charAt(0) == '"' ) {
		int ulen = us[i].length() ;
		// unquote only if last char is a quote, otherwise, leave as is
		// which will trigger an exception when trying to build the URL
		// object out of it.
		if (us[i].charAt(ulen-1) == '"')
		    urls[i] = us[i].substring(1, ulen-1) ; 
	    } else {
		urls[i] = us[i] ;
	    }
	}
	return urls ;
    }

    /**
     * Get the integer code for the String based PICS format.
     * @param request The request to be handled.
     * @param format The string representation of the format.
     * @return An LabelBureauInterface defined format code.
     * @exception HTTPException if processing the request failed.
     * @see org.w3c.jigsaw.pics.LabelBureauInterface
     */

    protected int parseFormat (Request request, String format)
	throws HTTPException
    {
	if ( format == null ) {
	    return LabelBureauInterface.FMT_FULL;
	} else if ( format.equals ("minimal") ) {
	    return LabelBureauInterface.FMT_MINIMAL ;
	} else if ( format.equals ("short") ) {
	    return LabelBureauInterface.FMT_SHORT ;
	} else if ( format.equals ("full") ) {
	    return LabelBureauInterface.FMT_FULL ;
	} else if ( format.equals ("signed") ) {
	    return LabelBureauInterface.FMT_SIGNED ;
	}
	Reply error = request.makeReply(HTTP.BAD_REQUEST) ;
	error.setContent ("Unknown label format: "+format);
	throw new HTTPException (error) ;
    }

    /**
     * Handle the request.
     * @param request The request to be handled.
     * @param data The URLDecoder
     * @return A Reply instance.
     * @exception ProtocolException if processing the request failed.
     * @see org.w3c.jigsaw.pics.LabelBureauInterface
     */
    public Reply handle (Request request, URLDecoder data) 
	throws ProtocolException
    {
	if (labelb == null) {
	    Reply reply = request.makeReply(HTTP.INTERNAL_SERVER_ERROR);
	    reply.setContent("LabelBureauFrame not configured properly: "+
			     "must be attached to a LabelBureauResource.");
	    throw new HTTPException(reply);
	}
	// Get opt (only generic/normal/insert)
	String opt        = data.getValue("opt") ;
	String urls[]     = parseURLs (data.getMultipleValues ("u")) ;
	int    iformat   = parseFormat(request,data.getValue("format"));
	String services[] = parseURLs (data.getMultipleValues ("s")) ;
	if (services == null)
	    services = labelb.getServices();
	if ((services == null) || (services.length == 0))
	    return labelb.makePICSErrorReply(request, 
					   "no-ratings \"unknown service\"");
	// Perform request
	if (labelb.getDebugFlag()) {
	    System.out.println("******** PICS REQUEST ********");
	    System.out.println("opt      : "+opt);
	    System.out.println("format   : "+data.getValue("format"));
	    System.out.print("services : ");
	    for (int i=0; i < services.length; i++)
		System.out.println(services[i]);
	    System.out.print("urls     : ");
	    for (int i=0; i < urls.length; i++)
		System.out.println(urls[i]);
	    System.out.println("******************************");
	}
	if ( opt.equals ("generic") ) {
	    return labelb.getGenericLabels (request, iformat, 
					    urls, services, data) ;
	} else if ( opt.equals ("normal") ) {
	    return labelb.getNormalLabels (request, iformat, urls, 
					   services, data) ;
	} else if ( opt.equals ("tree") ) {
	    return labelb.getTreeLabels (request, iformat, urls, 
					 services, data) ;
	} else  if ( opt.equals ("generic+tree") ) {
	    return labelb.getGenericTreeLabels(request,iformat, 
					       urls, services, data);
	} else {
	    Reply error = request.makeReply(HTTP.BAD_REQUEST);
	    error.setContent ("Invalid label bureau query, bad option: "+opt);
	    throw new HTTPException (error) ;
	}
    }
}
