// index.java 
// -----------------------
// part of the AnomicHTTPD caching proxy
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
// last major change: 12.07.2003
//
// 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.


// You must compile this file with
// javac -classpath .:../classes index.java
// if the shell's current path is HTROOT

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.TreeSet;

import de.anomic.htmlFilter.htmlFilterContentScraper;
import de.anomic.http.httpHeader;
import de.anomic.kelondro.kelondroMSetTools;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.server.serverByteBuffer;
import de.anomic.server.serverCore;
import de.anomic.server.serverDate;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
import de.anomic.yacy.yacyCore;

public class index {

    public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
        plasmaSwitchboard sb = (plasmaSwitchboard) env;

	// case if no values are requested
	if ((post == null) || (env == null)) {
            
            // save referrer
            //System.out.println("HEADER=" + header.toString());
            String referer = (String) header.get("Referer");
            if (referer != null) {
                URL url;
                try { url = new URL(referer); } catch (MalformedURLException e) { url = null; }
                if ((url != null) && (serverCore.isNotLocal(url))) {
                    HashMap referrerprop = new HashMap();
                    referrerprop.put("count", "1");
                    referrerprop.put("clientip", header.get("CLIENTIP"));
                    referrerprop.put("useragent", header.get("User-Agent"));
                    referrerprop.put("date", (new serverDate()).toShortString(false));
                    try { sb.facilityDB.update("backlinks", referer, referrerprop); } catch (IOException e) {}
                }
            }

	    // we create empty entries for template strings
	    serverObjects prop = new serverObjects();
	    prop.put("promoteSearchPageGreeting", env.getConfig("promoteSearchPageGreeting", ""));
            prop.put("former", "");
	    prop.put("num-results", 0);
	    prop.put("excluded", 0);
	    prop.put("combine", 0);
	    prop.put("resultbottomline", 0);
	    prop.put("count-10", 0);
	    prop.put("count-50", 0);
	    prop.put("count-100", 0);
            prop.put("count-1000", 0);
	    prop.put("order-quality", 0);
	    prop.put("order-date", 0);
	    prop.put("resource-global", 0);
	    prop.put("resource-local", 0);
	    prop.put("time-1", 0);
	    prop.put("time-3", 0);
	    prop.put("time-10", 1);
	    prop.put("time-30", 0);
	    prop.put("time-60", 0);
            prop.put("results", "");
	    prop.put("urlmaskoptions", 0);
	    prop.put("urlmaskoptions_urlmaskfilter", ".*");
            return prop;
	}

        // process search words
        String querystring = (String) post.get("search", "");
	try { sb.facilityDB.update("zeitgeist", querystring, post); } catch (Exception e) {}
        TreeSet query = cleanQuery(querystring);
        // filter out stopwords
        TreeSet filtered = kelondroMSetTools.joinConstructive(query, plasmaSwitchboard.stopwords);
        if (filtered.size() > 0) kelondroMSetTools.excludeDestructive(query, plasmaSwitchboard.stopwords);
        
        // prepare search order
	String order = (String) post.get("order", "");
	int count = Integer.parseInt((String) post.get("count", "10"));
	boolean global = ((String) post.get("resource", "global")).equals("global");
	long searchtime = 1000 * Long.parseLong((String) post.get("time", "1"));
	boolean yacyonline = ((yacyCore.seedDB != null) &&
                              (yacyCore.seedDB.mySeed != null) &&
                              (yacyCore.seedDB.mySeed.getAddress() != null));

	String order1 = (order.equals("Quality-Date")) ? "quality" : "date";
        String order2 = (order.equals("Quality-Date")) ? "date" : "quality";
	String urlmask="";
	if(post.containsKey("urlmask") && post.get("urlmask").equals("no")){
		urlmask=".*";
	}else{
		urlmask = (post.containsKey("urlmaskfilter")) ? (String) post.get("urlmaskfilter") : ".*";
	}

        // do the search
	serverObjects prop = ((plasmaSwitchboard) env).searchFromLocal(query, order1, order2, count,
                                ((global) && (yacyonline) && (!(env.getConfig("last-search","").equals(querystring)))),
                                searchtime, urlmask);

        // remember the last search expression
        env.setConfig("last-search", querystring);
        
        // process result of search
	prop.put("resultbottomline", 0);
        if (filtered.size() > 0){
	    prop.put("excluded", 1);
	    prop.put("excluded_stopwords", filtered.toString());
	} else {
	    prop.put("excluded", 0);
	}
	if ((prop == null) || (prop.size() == 0)) {
	    if (((String) post.get("search", "")).length() < 3)
			prop.put("num-results", 2);//no results - at least 3 chars
	    else
			prop.put("num-results", 1);//no results

	} else {
	    int linkcount = Integer.parseInt(prop.get("linkcount", "0"));
            int totalcount = Integer.parseInt(prop.get("totalcount", "0"));
	    if (totalcount > 10) {
                Object[] references = (Object[]) prop.get("references", new String[0]);
		prop.put("num-results", 4);
		prop.put("num-results_linkcount", linkcount);
		prop.put("num-results_totalcount", totalcount);
                int hintcount = references.length;
                if (hintcount > 0) {
                    if (hintcount > 16) hintcount = 16;
		    prop.put("combine", 1);
                    String word;
                    int p;
                    for (int i = 0; i < hintcount; i++) {
                        word = (String) references[i];
                        if (word != null) {
			    prop.put("combine_words_" + i + "_word", word);
			    prop.put("combine_words_" + i + "_newsearch", ((String) post.get("search", "")).replace(' ', '+') + "+" + word);
			    prop.put("combine_words_" + i + "_count", count);
			    prop.put("combine_words_" + i + "_order", order);
			    prop.put("combine_words_" + i + "_resource", ((global) ? "global" : "local"));
			    prop.put("combine_words_" + i + "_time", (searchtime / 1000));
                        }
			prop.put("combine_words", i);
                    }
                }
            } else {
		if (totalcount == 0)
		    prop.put("num-results", 3);//long
		else {
		    prop.put("num-results", 4);
		    prop.put("num-results_linkcount", linkcount);
		    prop.put("num-results_totalcount", totalcount);
		}
	    }
	}

	if(urlmask.equals(".*")){
	    prop.put("urlmaskoptions", 0);
	} else {
	    prop.put("urlmaskoptions", 1);
	}

	prop.put("urlmaskoptions_urlmaskfilter", urlmask);

	if (yacyonline) {
	    if (global) {
		prop.put("resultbottomline", 1);
		prop.put("resultbottomline_globalresults", prop.get("globalresults", "0"));
	    } else {
		prop.put("resultbottomline", 2);
	    }
	} else {
	    if (global)
		prop.put("resultbottomlien", 3);
	    else
		prop.put("resultbottomline", 4);
	}

	prop.put("count-10", ((count == 10)) ? 1 : 0);
	prop.put("count-50", ((count == 50)) ? 1 : 0);
	prop.put("count-100", ((count == 100)) ? 1 : 0);
        prop.put("count-1000", ((count == 1000)) ? 1 : 0);
	prop.put("order-quality", ((order.equals("Quality-Date")) ? 1 : 0));
	prop.put("order-date", ((order.equals("Date-Quality")) ? 1 : 0));
	prop.put("resource-global", ((global) ? 1 : 0));
	prop.put("resource-local", ((!global) ? 1 : 0));
	prop.put("time-1", ((searchtime == 1000) ? 1 : 0));
	prop.put("time-3", ((searchtime == 3000) ? 1 : 0));
	prop.put("time-10", ((searchtime == 10000) ? 1 : 0));
	prop.put("time-30", ((searchtime == 30000) ? 1 : 0));
	prop.put("time-60", ((searchtime == 60000) ? 1 : 0));
        prop.put("former", (String) post.get("search", ""));
        
        // 'enrich search' variables
        prop.put("num-results_former", (String) post.get("search", ""));
        prop.put("num-results_time", searchtime / 1000);
        prop.put("num-results_count", count);
        prop.put("num-results_resource", (global) ? "global" : "local");
        prop.put("num-results_order", order);
        
	// return rewrite properties
	prop.put("promoteSearchPageGreeting", env.getConfig("promoteSearchPageGreeting", ""));
    
    // adding some additional properties needed for the rss feed
    String hostName = (String) header.get("Host","localhost");
    if (hostName.indexOf(":") == -1) hostName += ":" + env.getConfig("port","8080");
    prop.put("rssYacyImageURL","http://" + hostName + "/env/grafics/yacy.gif");    
    
    return prop;
    }

    public static TreeSet cleanQuery(String words) {
        // convert Umlaute
        words = htmlFilterContentScraper.convertUmlaute(new serverByteBuffer(words.getBytes())).toString();
        
        // remove funny symbols
        String seps = "' .,:/-&";
        words = words.toLowerCase().trim();
        int c;
        for (int i = 0; i < seps.length(); i++) {
            if ((c = words.indexOf(seps.charAt(i))) >= 0) words = words.substring(0, c) + (((c + 1) < words.length()) ? (" " + words.substring(c + 1)) : "");
        }

        // the string is clean now, but we must generate a set out of it
        String[] a = words.split(" ");
        TreeSet query = new TreeSet(kelondroMSetTools.fastStringComparator);
        for (int i = 0; i < a.length; i++) query.add(a[i]);
        return query;
    }
}