// yacysearchitem.java
// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 28.08.2007 on http://yacy.net
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
// $LastChangedRevision: 1986 $
// $LastChangedBy: orbiter $
//
// LICENSE
// 
// 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

import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;

import de.anomic.http.httpHeader;
import de.anomic.kelondro.kelondroMSetTools;
import de.anomic.kelondro.kelondroNaturalOrder;
import de.anomic.plasma.plasmaSearchEvent;
import de.anomic.plasma.plasmaSearchPreOrder;
import de.anomic.plasma.plasmaSearchQuery;
import de.anomic.plasma.plasmaSearchRankingProfile;
import de.anomic.plasma.plasmaSnippetCache;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
import de.anomic.tools.crypt;
import de.anomic.tools.nxTools;
import de.anomic.yacy.yacyCore;
import de.anomic.yacy.yacyNewsPool;
import de.anomic.yacy.yacySeed;
import de.anomic.yacy.yacyURL;


public class yacysearchitem {

    private static boolean col = true;
    private static final int namelength = 60;
    private static final int urllength = 120;
    private static final int MAX_TOPWORDS = 24;
    
    public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
        final plasmaSwitchboard sb = (plasmaSwitchboard) env;
        final serverObjects prop = new serverObjects();
        
        String eventID = post.get("eventID", "");
        boolean bottomline = post.get("bottomline", "false").equals("true");
        boolean rss = post.get("rss", "false").equals("true");
        boolean authenticated = sb.adminAuthenticated(header) >= 2;
        int item = post.getInt("item", -1);
        
        // default settings for blank item
        prop.put("content", "0");
        prop.put("rss", "0");
        prop.put("references", "0");
        prop.put("rssreferences", "0");
        prop.put("dynamic", "0");
        
        // find search event
        plasmaSearchEvent theSearch = plasmaSearchEvent.getEvent(eventID);
        if (theSearch == null) {
            // the event does not exist, show empty page
            return prop;
        }
        plasmaSearchQuery theQuery = theSearch.getQuery();
        plasmaSearchRankingProfile ranking = theSearch.getRanking();

        // dynamically update count values
        if (!rss) {
            prop.put("dynamic_offset", theQuery.neededResults() - theQuery.displayResults() + 1);
            prop.put("dynamic_global", theSearch.getGlobalCount());
            prop.put("dynamic_total", theSearch.getGlobalCount() + theSearch.getLocalCount());
            prop.put("dynamic_items", (item < 0) ? theQuery.neededResults() : item + 1);
            prop.put("dynamic", "1");
        }
        
        if (bottomline) {
            // attach the bottom line with search references (topwords)
            final Set references = theSearch.references(20);
            if (references.size() > 0) {
                // get the topwords
                final TreeSet topwords = new TreeSet(kelondroNaturalOrder.naturalOrder);
                String tmp = "";
                Iterator i = references.iterator();
                while (i.hasNext()) {
                    tmp = (String) i.next();
                    if (tmp.matches("[a-z]+")) {
                        topwords.add(tmp);
                    }
                }

                // filter out the badwords
                final TreeSet filteredtopwords = kelondroMSetTools.joinConstructive(topwords, plasmaSwitchboard.badwords);
                if (filteredtopwords.size() > 0) {
                    kelondroMSetTools.excludeDestructive(topwords, plasmaSwitchboard.badwords);
                }

                // avoid stopwords being topwords
                if (env.getConfig("filterOutStopwordsFromTopwords", "true").equals("true")) {
                    if ((plasmaSwitchboard.stopwords != null) && (plasmaSwitchboard.stopwords.size() > 0)) {
                        kelondroMSetTools.excludeDestructive(topwords, plasmaSwitchboard.stopwords);
                    }
                }
                
                if (rss) {
                    String word;
                    int hintcount = 0;
                    final Iterator iter = topwords.iterator();
                    while (iter.hasNext()) {
                        word = (String) iter.next();
                        if (word != null) {
                            prop.putHTML("rssreferences_words_" + hintcount + "_word", word);
                        }
                        prop.put("rssreferences_words", hintcount);
                        if (hintcount++ > MAX_TOPWORDS) {
                            break;
                        }
                    }
                    prop.put("rssreferences", "1");
                } else {
                    String word;
                    int hintcount = 0;
                    final Iterator iter = topwords.iterator();
                    while (iter.hasNext()) {
                        word = (String) iter.next();
                        if (word != null) {
                            prop.putHTML("references_words_" + hintcount + "_word", word);
                            prop.putHTML("references_words_" + hintcount + "_newsearch", theQuery.queryString.replace(' ', '+') + "+" + word);
                            prop.put("references_words_" + hintcount + "_count", theQuery.displayResults());
                            prop.put("references_words_" + hintcount + "_offset", "0");
                            prop.put("references_words_" + hintcount + "_contentdom", theQuery.contentdom());
                            prop.put("references_words_" + hintcount + "_resource", theQuery.searchdom());
                            prop.put("references_words_" + hintcount + "_time", (theQuery.maximumTime / 1000));
                        }
                        prop.put("references_words", hintcount);
                        if (hintcount++ > MAX_TOPWORDS) {
                            break;
                        }
                    }
                    prop.put("references", "1");
                }
            }
            
            return prop;
        }
        
        // generate result object
        plasmaSearchEvent.ResultEntry result = theSearch.oneResult(item);
        
        if (result == null) {
            // no content
            return prop;
        }
            
        if (rss) {
            // text search for rss output
            prop.put("rss", "1"); // switch on specific content
            prop.putHTML("rss_title", result.title(), true);
            prop.putHTML("rss_description", result.textSnippet().getLineRaw(), true);
            prop.putHTML("rss_link", result.urlstring(), true);
            prop.put("rss_urlhash", result.hash());
            prop.put("rss_date", plasmaSwitchboard.dateString822(result.modified()));
            return prop;
        }
        
        prop.put("rss", "0");
        
        if (theQuery.contentdom == plasmaSearchQuery.CONTENTDOM_TEXT) {
            // text search
            prop.put("content", theQuery.contentdom + 1); // switch on specific content
            prop.put("content_authorized", authenticated ? "1" : "0");
            prop.put("content_authorized_recommend", (yacyCore.newsPool.getSpecific(yacyNewsPool.OUTGOING_DB, yacyNewsPool.CATEGORY_SURFTIPP_ADD, "url", result.urlstring()) == null) ? "1" : "0");
            prop.put("content_authorized_recommend_deletelink", "/yacysearch.html?search=" + theQuery.queryString + "&Enter=Search&count=" + theQuery.displayResults() + "&offset=" + (theQuery.neededResults() - theQuery.displayResults()) + "&order=" + crypt.simpleEncode(ranking.toExternalString()) + "&resource=local&time=3&deleteref=" + result.hash() + "&urlmaskfilter=.*");
            prop.put("content_authorized_recommend_recommendlink", "/yacysearch.html?search=" + theQuery.queryString + "&Enter=Search&count=" + theQuery.displayResults() + "&offset=" + (theQuery.neededResults() - theQuery.displayResults()) + "&order=" + crypt.simpleEncode(ranking.toExternalString()) + "&resource=local&time=3&recommendref=" + result.hash() + "&urlmaskfilter=.*");
            prop.put("content_authorized_urlhash", result.hash());
            prop.putHTML("content_description", result.title());
            prop.put("content_url", result.urlstring());
        
            int port=result.url().getPort();
            yacyURL faviconURL;
            try {
                faviconURL = new yacyURL(result.url().getProtocol() + "://" + result.url().getHost() + ((port != -1) ? (":" + String.valueOf(port)) : "") + "/favicon.ico", null);
            } catch (MalformedURLException e1) {
                faviconURL = null;
            }
        
            prop.putHTML("content_faviconCode", sb.licensedURLs.aquireLicense(faviconURL)); // aquire license for favicon url loading
            prop.put("content_urlhash", result.hash());
            prop.put("content_urlhexhash", yacySeed.b64Hash2hexHash(result.hash()));
            prop.putHTML("content_urlname", nxTools.shortenURLString(result.urlname(), urllength));
            prop.put("content_date", plasmaSwitchboard.dateString(result.modified()));
            prop.put("content_ybr", plasmaSearchPreOrder.ybr(result.hash()));
            prop.putNum("content_size", result.filesize());
        
            TreeSet[] query = theQuery.queryWords();
            yacyURL wordURL = null;
            try {
                prop.putHTML("content_words", URLEncoder.encode(query[0].toString(),"UTF-8"));
            } catch (UnsupportedEncodingException e) {}
            prop.putHTML("content_former", theQuery.queryString);
            prop.put("content_rankingprops", result.word().toPropertyForm() + ", domLengthEstimated=" + yacyURL.domLengthEstimation(result.hash()) +
                    ((yacyURL.probablyRootURL(result.hash())) ? ", probablyRootURL" : "") + 
                    (((wordURL = yacyURL.probablyWordURL(result.hash(), query[0])) != null) ? ", probablyWordURL=" + wordURL.toNormalform(false, true) : ""));
 
            prop.put("content_snippet", result.textSnippet().getLineMarked(theQuery.queryHashes));
            return prop;
        }
        
        if (theQuery.contentdom == plasmaSearchQuery.CONTENTDOM_IMAGE) {
            // image search; shows thumbnails
            // iterate over all images in the result
            prop.put("content", theQuery.contentdom + 1); // switch on specific content
            ArrayList /* of plasmaSnippetCache.MediaSnippet */ images = result.mediaSnippets();
            if (images != null) {
                plasmaSnippetCache.MediaSnippet ms;
                yacyURL url;
                int c = 0;
                for (int i = 0; i < images.size(); i++) {
                    ms = (plasmaSnippetCache.MediaSnippet) images.get(i);
                    try {url = new yacyURL(ms.href, null);} catch (MalformedURLException e) {continue;}
                    prop.putHTML("content_items_" + i + "_href", ms.href);
                    prop.put("content_items_" + i + "_code", sb.licensedURLs.aquireLicense(url));
                    prop.putHTML("content_items_" + i + "_name", shorten(ms.name, namelength));
                    prop.put("content_items_" + i + "_attr", ms.attr); // attributes, here: original size of image
                    c++;
                }
                prop.put("content_items", c);
            } else {
                prop.put("content_items", "0");
            }
            return prop;
        }
        
        if ((theQuery.contentdom == plasmaSearchQuery.CONTENTDOM_AUDIO) ||
            (theQuery.contentdom == plasmaSearchQuery.CONTENTDOM_VIDEO) ||
            (theQuery.contentdom == plasmaSearchQuery.CONTENTDOM_APP)) {
            // any other media content
            prop.put("content", theQuery.contentdom + 1); // switch on specific content
            ArrayList /* of plasmaSnippetCache.MediaSnippet */ media = result.mediaSnippets();
            if (item == 0) col = true;
            if (media != null) {
                plasmaSnippetCache.MediaSnippet ms;
                int c = 0;
                for (int i = 0; i < media.size(); i++) {
                    ms = (plasmaSnippetCache.MediaSnippet) media.get(i);
                    prop.putHTML("content_items_" + i + "_href", ms.href);
                    prop.putHTML("content_items_" + i + "_hrefshort", nxTools.shortenURLString(ms.href, urllength));
                    prop.putHTML("content_items_" + i + "_name", shorten(ms.name, namelength));
                    prop.put("content_items_" + i + "_col", (col) ? "0" : "1");
                    c++;
                    col = !col;
                }
                prop.put("content_items", c);
            } else {
                prop.put("content_items", "0");
            }
            return prop;
        }
        
        return prop;
    }
    
    private static String shorten(String s, int length) {
        if (s.length() <= length) return s;
        int p = s.lastIndexOf('.');
        if (p < 0) return s.substring(0, length - 3) + "...";
        return s.substring(0, length - (s.length() - p) - 3) + "..." + s.substring(p);
    }
}