/*
 *    Library2.java
 *    Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.greenstone.gsdl3;

import org.greenstone.gsdl3.core.*;
import org.greenstone.gsdl3.util.*;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Set;
import java.util.Iterator;
/**
 * A program to take cgi args from the command line and return html
 *
 * @author <a href="mailto:kjdon@cs.waikato.ac.nz">Katherine Don</a>
 * @version $Revision: 16688 $
 */

final public class Library2 {
 
    protected XMLConverter converter = null;
    protected Document doc = null;
    
    protected HashMap saved_args = null;
    protected GSParams params = null;
    protected DefaultReceptionist recept = null;
    
    public Library2 (){
	this.converter = new XMLConverter();
	this.doc = converter.newDOM();
	this.saved_args = new HashMap();
	this.params = new GSParams();
	this.recept = new DefaultReceptionist();
    }
    
    public void configure(String site_name, String interface_name) {

	HashMap config_params = new HashMap();
	//config_params.put(GSConstants.GSDL3_HOME, gsdl_home);
	config_params.put(GSConstants.SITE_NAME, site_name);
	config_params.put(GSConstants.INTERFACE_NAME, interface_name);
	// new message router - create it and pass a handle to recept.
	// the servlet wont use this directly
	MessageRouter message_router = new MessageRouter();
	
	message_router.setSiteName(site_name);
	message_router.configure();
	// new receptionist
	recept.setConfigParams(config_params);
	recept.setMessageRouter(message_router);
	recept.setParams(params);
	recept.configure();
    }
    public static void main(String args[]) {

	if (args.length != 2) {
	    System.out.println("Usage: Library2 <site name> <interface name>");
	    System.exit(1);
	}
	
	Library2 library = new Library2();
	library.configure(args[0], args[1]);
	

	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	String query=null;
	String result=null;
	while (true) {
	    System.out.println("Please enter the  cgi args (all on one line), or 'exit' to quit (default a=p&sa=home)");
	    try {
		query = br.readLine();
	    } catch (Exception e) {
		System.err.println("Library2 exception:"+e.getMessage());
	    }
	    if (query.startsWith("exit")) {
		System.exit(1);
	    }

	    result = library.process(query);
	    
	    System.out.println(result);


	}

    } 

    protected String process(String query) {
	Element xml_message  = generateRequest(query);
	System.out.println("*********************");
	System.out.println(converter.getPrettyString(xml_message));
	Node xml_result = recept.process(xml_message);
	return this.converter.getPrettyString(xml_result);
    }
    protected Element generateRequest(String cgiargs) {

	Element xml_message = this.doc.createElement(GSXML.MESSAGE_ELEM);
	Element xml_request = GSXML.createBasicRequest(this.doc, GSXML.REQUEST_TYPE_PAGE, "", "", "");
	xml_message.appendChild(xml_request);
	Element xml_param_list = this.doc.createElement(GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
	xml_request.appendChild(xml_param_list);

	// the defaults
	String action = "p";
	String subaction = "home";
	String lang = (String)saved_args.get(GSParams.LANGUAGE);
	if (lang == null) {
	    lang = "en";
	}
	String output = "html";
	
	String args [] = cgiargs.split("&");
	for (int i=0; i<args.length; i++) {
	    String arg = args[i];
	    int pos = arg.indexOf('=');
	    if (pos == -1) continue;
	    String name = arg.substring(0, pos);
	    String value = arg.substring(pos+1);
	    if (name.equals(GSParams.ACTION)) {
		action = value;
	    } else if (name.equals(GSParams.SUBACTION)) {
		subaction = (value);
	    } else if (name.equals(GSParams.LANGUAGE)) {
		lang = value;
		saved_args.put(name, value);
	    } else if (name.equals(GSParams.OUTPUT)) {
		output = value;
	    } else if (params.shouldSave(name)) {
		saved_args.put(name, value);
	    } else {
		// make a param now
		Element param = doc.createElement(GSXML.PARAM_ELEM);
		param.setAttribute(GSXML.NAME_ATT, name);
		param.setAttribute(GSXML.VALUE_ATT, GSXML.xmlSafe(value));
		xml_param_list.appendChild(param);
	    }
	}

	xml_request.setAttribute(GSXML.OUTPUT_ATT, output);
	xml_request.setAttribute(GSXML.ACTION_ATT, action);
	xml_request.setAttribute(GSXML.SUBACTION_ATT, subaction);
	xml_request.setAttribute(GSXML.LANG_ATT, lang);


	// put in all the params from the session cache
	Set params = saved_args.keySet();
	Iterator i = params.iterator();
	while (i.hasNext()) {
	    String name = (String)i.next();
	    if (name.equals(GSParams.LANGUAGE)) continue;
	    Element param = this.doc.createElement(GSXML.PARAM_ELEM);
	    param.setAttribute(GSXML.NAME_ATT, name);
	    param.setAttribute(GSXML.VALUE_ATT, GSXML.xmlSafe((String)saved_args.get(name)));
	    xml_param_list.appendChild(param);
	}

	return xml_message;
    }
}