// yacysearch.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
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// 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 yacysearch.java
// if the shell's current path is HTROOT

import java.util.HashMap;
import java.util.TreeSet;

import de.anomic.http.httpHeader;
import de.anomic.index.indexURLEntry;
import de.anomic.kelondro.kelondroBitfield;
import de.anomic.kelondro.kelondroMSetTools;
import de.anomic.plasma.plasmaCondenser;
import de.anomic.plasma.plasmaParserDocument;
import de.anomic.plasma.plasmaSearchEvent;
import de.anomic.plasma.plasmaSearchQuery;
import de.anomic.plasma.plasmaSnippetCache;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.server.serverCore;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
import de.anomic.server.logging.serverLog;
import de.anomic.tools.yFormatter;
import de.anomic.yacy.yacyCore;
import de.anomic.yacy.yacyNewsPool;
import de.anomic.yacy.yacyNewsRecord;
import de.anomic.yacy.yacyURL;

public class yacysearch {

    public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
        final plasmaSwitchboard sb = (plasmaSwitchboard) env;
        sb.localSearchLastAccess = System.currentTimeMillis();
        
        boolean searchAllowed = sb.getConfigBool("publicSearchpage", true) || sb.verifyAuthentication(header, false);
        
        boolean authenticated = sb.adminAuthenticated(header) >= 2;
        int display = (post == null) ? 0 : post.getInt("display", 0);
        if ((display == 1) && (!authenticated)) display = 0;
        int input = (post == null) ? 2 : post.getInt("input", 2);
        String promoteSearchPageGreeting = env.getConfig("promoteSearchPageGreeting", "");
        if (env.getConfigBool("promoteSearchPageGreeting.useNetworkName", false)) promoteSearchPageGreeting = env.getConfig("network.unit.description", "");
        if (promoteSearchPageGreeting.length() == 0) promoteSearchPageGreeting = "P2P WEB SEARCH";

        // case if no values are requested
        String querystring = (post == null) ? "" : post.get("search", "").trim();
        boolean rss = (post == null) ? false : post.get("rss", "false").equals("true");
        
        if ((post == null) || (env == null) || (querystring.length() == 0) || (!searchAllowed)) {
        	/*
            // save referrer
            final String referer = (String) header.get("Referer");
        	if (referer != null) {
                yacyURL url;
                try { url = new yacyURL(referer, null); } catch (MalformedURLException e) { url = null; }
                if ((url != null) && (!url.isLocal())) {
                    final 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));
                    if (sb.facilityDB != null) try { sb.facilityDB.update("backlinks", referer, referrerprop); } catch (IOException e) {}
                }
            }
        	 */
            // we create empty entries for template strings
            final serverObjects prop = new serverObjects();
            prop.put("searchagain", "0");
            prop.put("input", input);
            prop.put("display", display);
            prop.put("input_input", input);
            prop.put("input_display", display);
            prop.put("input_promoteSearchPageGreeting", promoteSearchPageGreeting);
            prop.put("input_former", "");
            prop.put("former", "");
            prop.put("input_count", "10");
            prop.put("input_offset", "0");
            prop.put("input_resource", "global");
            prop.put("input_time", sb.getConfigLong("network.unit.search.time", 3));
            prop.put("input_urlmaskfilter", ".*");
            prop.put("input_prefermaskfilter", "");
            prop.put("input_indexof", "off");
            prop.put("input_constraint", "");
            prop.put("input_cat", "href");
            prop.put("input_depth", "0");
            prop.put("input_contentdom", "text");
            prop.put("input_contentdomCheckText", "1");
            prop.put("input_contentdomCheckAudio", "0");
            prop.put("input_contentdomCheckVideo", "0");
            prop.put("input_contentdomCheckImage", "0");
            prop.put("input_contentdomCheckApp", "0");
            prop.put("excluded", "0");
            prop.put("results", "");
            prop.put("resultTable", "0");
            prop.put("num-results", searchAllowed ? "0" : "4");
            
            return prop;
        }

        // collect search attributes
        int maxDistance = Integer.MAX_VALUE;
        
        if ((querystring.length() > 2) && (querystring.charAt(0) == '"') && (querystring.charAt(querystring.length() - 1) == '"')) {
            querystring = querystring.substring(1, querystring.length() - 1).trim();
            maxDistance = 1;
        }
        if (sb.facilityDB != null) try { sb.facilityDB.update("zeitgeist", querystring, post); } catch (Exception e) {}

        int itemsPerPage = post.getInt("count", 10);
        int offset = post.getInt("offset", 0);
        boolean global = (post == null) ? true : post.get("resource", "global").equals("global");
        final boolean indexof = post.get("indexof","").equals("on"); 
        final long searchtime = 1000 * post.getLong("time", (int) sb.getConfigLong("network.unit.search.time", 3));
        String urlmask = "";
        if (post.containsKey("urlmask") && post.get("urlmask").equals("no")) {
            urlmask = ".*";
        } else {
            urlmask = (post.containsKey("urlmaskfilter")) ? (String) post.get("urlmaskfilter") : ".*";
        }
        String prefermask = post.get("prefermaskfilter", "");
        if ((prefermask.length() > 0) && (prefermask.indexOf(".*") < 0)) prefermask = ".*" + prefermask + ".*";

        kelondroBitfield constraint = ((post.containsKey("constraint")) && (post.get("constraint", "").length() > 0)) ? new kelondroBitfield(4, post.get("constraint", "______")) : null;
        if (indexof) {
            constraint = new kelondroBitfield(4);
            constraint.set(plasmaCondenser.flag_cat_indexof, true);
        }
        
        // SEARCH
        final boolean indexDistributeGranted = sb.getConfig(plasmaSwitchboard.INDEX_DIST_ALLOW, "true").equals("true");
        final boolean indexReceiveGranted = sb.getConfig("allowReceiveIndex", "true").equals("true");
        final boolean offline = yacyCore.seedDB.mySeed().isVirgin();
        final boolean clustersearch = sb.isRobinsonMode() &&
    									(sb.getConfig("cluster.mode", "").equals("privatecluster") ||
    									 sb.getConfig("cluster.mode", "").equals("publiccluster"));
        if (offline || !indexDistributeGranted || !indexReceiveGranted) { global = false; }
        if (clustersearch) global = true; // switches search on, but search target is limited to cluster nodes
        
        // find search domain
        int contentdomCode = plasmaSearchQuery.contentdomParser(post.get("contentdom", "text"));
        
        // patch until better search profiles are available
        if ((contentdomCode != plasmaSearchQuery.CONTENTDOM_TEXT) && (itemsPerPage <= 30)) itemsPerPage = 30;
        
        serverObjects prop = new serverObjects();
        if (post.get("cat", "href").equals("href")) {

            final TreeSet[] query = plasmaSearchQuery.cleanQuery(querystring); // converts also umlaute
            // filter out stopwords
            final TreeSet filtered = kelondroMSetTools.joinConstructive(query[0], plasmaSwitchboard.stopwords);
            if (filtered.size() > 0) {
                kelondroMSetTools.excludeDestructive(query[0], plasmaSwitchboard.stopwords);
            }

            // if a minus-button was hit, remove a special reference first
            if (post.containsKey("deleteref")) {
                if (!sb.verifyAuthentication(header, true)) {
                    prop.put("AUTHENTICATE", "admin log-in"); // force log-in
                    return prop;
                }
                
                // delete the index entry locally
                final String delHash = post.get("deleteref", ""); // urlhash
                sb.wordIndex.removeWordReferences(query[0], delHash);

                // make new news message with negative voting
                HashMap map = new HashMap();
                map.put("urlhash", delHash);
                map.put("vote", "negative");
                map.put("refid", "");
                yacyCore.newsPool.publishMyNews(yacyNewsRecord.newRecord(yacyNewsPool.CATEGORY_SURFTIPP_VOTE_ADD, map));
            }

            // if a plus-button was hit, create new voting message
            if (post.containsKey("recommendref")) {
                if (!sb.verifyAuthentication(header, true)) {
                    prop.put("AUTHENTICATE", "admin log-in"); // force log-in
                    return prop;
                }
                final String recommendHash = post.get("recommendref", ""); // urlhash
                indexURLEntry urlentry = sb.wordIndex.loadedURL.load(recommendHash, null, 0);
                if (urlentry != null) {
                    indexURLEntry.Components comp = urlentry.comp();
                    plasmaParserDocument document;
                    document = plasmaSnippetCache.retrieveDocument(comp.url(), true, 5000, true);
                    if (document != null) {
                        // create a news message
                        HashMap map = new HashMap();
                        map.put("url", comp.url().toNormalform(false, true).replace(',', '|'));
                        map.put("title", comp.title().replace(',', ' '));
                        map.put("description", ((document == null) ? comp.title() : document.getTitle()).replace(',', ' '));
                        map.put("author", ((document == null) ? "" : document.getAuthor()));
                        map.put("tags", ((document == null) ? "" : document.getKeywords(' ')));
                        yacyCore.newsPool.publishMyNews(yacyNewsRecord.newRecord(yacyNewsPool.CATEGORY_SURFTIPP_ADD, map));
                        document.close();
                    }
                }
            }

            // prepare search properties
            final boolean yacyonline = ((yacyCore.seedDB != null) && (yacyCore.seedDB.mySeed() != null) && (yacyCore.seedDB.mySeed().getPublicAddress() != null));
            final boolean globalsearch = (global) && (yacyonline);
        
            // do the search
            TreeSet queryHashes = plasmaCondenser.words2hashes(query[0]);
            plasmaSearchQuery theQuery = new plasmaSearchQuery(
        			querystring,
        			queryHashes,
        			plasmaCondenser.words2hashes(query[1]),
                    maxDistance,
                    prefermask,
                    contentdomCode,
                    true,
                    itemsPerPage,
                    offset,
                    searchtime,
                    urlmask,
                    (clustersearch && globalsearch) ? plasmaSearchQuery.SEARCHDOM_CLUSTERALL :
                    ((globalsearch) ? plasmaSearchQuery.SEARCHDOM_GLOBALDHT : plasmaSearchQuery.SEARCHDOM_LOCAL),
                    "",
                    20,
                    constraint,
                    true);

            String client = (String) header.get("CLIENTIP"); // the search client who initiated the search
        
            // tell all threads to do nothing for a specific time
            sb.intermissionAllThreads(2 * theQuery.maximumTime);
        
            // filter out words that appear in bluelist
            theQuery.filterOut(plasmaSwitchboard.blueList);
            
            // log
            serverLog.logInfo("LOCAL_SEARCH", "INIT WORD SEARCH: " + theQuery.queryString + ":" + theQuery.queryHashes + " - " + theQuery.neededResults() + " links to be computed, " + theQuery.displayResults() + " lines to be displayed, " + (theQuery.maximumTime / 1000) + " seconds");
            long timestamp = System.currentTimeMillis();

            // create a new search event
            if (plasmaSearchEvent.getEvent(theQuery.id(false)) == null) {
                theQuery.setOffset(0); // in case that this is a new search, always start without a offset 
                offset = 0;
            }
            plasmaSearchEvent theSearch = plasmaSearchEvent.getEvent(theQuery, sb.getRanking(), sb.wordIndex, (sb.isRobinsonMode()) ? sb.clusterhashes : null, false, null);
            
            // generate result object
            serverLog.logFine("LOCAL_SEARCH", "SEARCH TIME AFTER ORDERING OF SEARCH RESULTS: " + ((System.currentTimeMillis() - timestamp) / 1000) + " seconds");
            serverLog.logFine("LOCAL_SEARCH", "SEARCH TIME AFTER RESULT PREPARATION: " + ((System.currentTimeMillis() - timestamp) / 1000) + " seconds");
                
            // calc some more cross-reference
            long remainingTime = theQuery.maximumTime - (System.currentTimeMillis() - timestamp);
            if (remainingTime < 0) remainingTime = 1000;
            serverLog.logFine("LOCAL_SEARCH", "SEARCH TIME AFTER XREF PREPARATION: " + ((System.currentTimeMillis() - timestamp) / 1000) + " seconds");

            // log
            serverLog.logInfo("LOCAL_SEARCH", "EXIT WORD SEARCH: " + theQuery.queryString + " - " +
                    (theSearch.getLocalCount() + theSearch.getGlobalCount()) + " links found, " +
                    ((System.currentTimeMillis() - timestamp) / 1000) + " seconds");

            // prepare search statistics
            Long trackerHandle = new Long(System.currentTimeMillis());
            HashMap searchProfile = theQuery.resultProfile(theSearch.getLocalCount() + theSearch.getGlobalCount(), System.currentTimeMillis() - timestamp, theSearch.getURLRetrievalTime(), theSearch.getSnippetComputationTime());
            searchProfile.put("querystring", theQuery.queryString);
            searchProfile.put("time", trackerHandle);
            searchProfile.put("host", client);
            searchProfile.put("offset", new Integer(0));
            sb.localSearches.add(searchProfile);
            TreeSet handles = (TreeSet) sb.localSearchTracker.get(client);
            if (handles == null) handles = new TreeSet();
            handles.add(trackerHandle);
            sb.localSearchTracker.put(client, handles);
        
            prop = new serverObjects();
            prop.put("num-results_totalcount", yFormatter.number(theSearch.getLocalCount() + theSearch.getGlobalCount(), !rss));
            prop.put("num-results_globalresults", "1");
            prop.put("num-results_globalresults_globalcount", yFormatter.number(theSearch.getGlobalCount(), !rss));
            prop.put("num-results_offset", offset);
            prop.put("num-results_linkcount", "0");
            prop.put("num-results_itemsPerPage", itemsPerPage);

            // compose page navigation
            StringBuffer resnav = new StringBuffer();
            int thispage = offset / theQuery.displayResults();
            if (thispage == 0) resnav.append("&lt;&nbsp;"); else {
                resnav.append(navurla(thispage - 1, display, theQuery));
                resnav.append("<strong>&lt;</strong></a>&nbsp;");
            }
            int numberofpages = Math.min(10, Math.min(thispage + 2, (theSearch.getGlobalCount() + theSearch.getLocalCount()) / theQuery.displayResults()));
            for (int i = 0; i < numberofpages; i++) {
                if (i == thispage) {
                    resnav.append("<strong>");
                    resnav.append(i + 1);
                    resnav.append("</strong>&nbsp;");
                } else {
                    resnav.append(navurla(i, display, theQuery));
                    resnav.append(i + 1);
                    resnav.append("</a>&nbsp;");
                }
            }
            if (thispage >= numberofpages) resnav.append("&gt;"); else {
                resnav.append(navurla(thispage + 1, display, theQuery));
                resnav.append("<strong>&gt;</strong></a>");
            }
            prop.put("num-results_resnav", resnav.toString());
        
            // generate the search result lines; they will be produced by another servlet
            for (int i = 0; i < theQuery.displayResults(); i++) {
                prop.put("results_" + i + "_item", offset + i);
                prop.put("results_" + i + "_eventID", theQuery.id(false));
            }
            prop.put("results", theQuery.displayResults());
            prop.put("resultTable", (contentdomCode <= 1) ? "0" : "1");
            prop.put("eventID", theQuery.id(false)); // for bottomline
            
            // process result of search
            if (filtered.size() > 0) {
                prop.put("excluded", "1");
                prop.putHTML("excluded_stopwords", filtered.toString());
            } else {
                prop.put("excluded", "0");
            }

            if (prop == null || prop.size() == 0) {
                if (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 {
                prop.put("num-results", "3");
            }

            prop.put("input_cat", "href");
            prop.put("input_depth", "0");

            // adding some additional properties needed for the rss feed
            String hostName = (String) header.get("Host", "localhost");
            if (hostName.indexOf(":") == -1) hostName += ":" + serverCore.getPortNr(env.getConfig("port", "8080"));
            prop.put("searchBaseURL", "http://" + hostName + "/yacysearch.html");
            prop.put("rssYacyImageURL", "http://" + hostName + "/env/grafics/yacy.gif");
        }
        
        prop.put("searchagain", global ? "1" : "0");
        prop.put("input", input);
        prop.put("display", display);
        prop.put("input_input", input);
        prop.put("input_display", display);
        prop.put("input_promoteSearchPageGreeting", promoteSearchPageGreeting);
        prop.putHTML("input_former", querystring);
        //prop.put("former", post.get("search", ""));
        prop.put("input_count", itemsPerPage);
        prop.put("input_offset", offset);
        prop.put("input_resource", global ? "global" : "local");
        prop.put("input_time", searchtime / 1000);
        prop.putHTML("input_urlmaskfilter", urlmask);
        prop.putHTML("input_prefermaskfilter", prefermask);
        prop.put("input_indexof", (indexof) ? "on" : "off");
        prop.put("input_constraint", (constraint == null) ? "" : constraint.exportB64());
        prop.put("input_contentdom", post.get("contentdom", "text"));
        prop.put("input_contentdomCheckText", (contentdomCode == plasmaSearchQuery.CONTENTDOM_TEXT) ? "1" : "0");
        prop.put("input_contentdomCheckAudio", (contentdomCode == plasmaSearchQuery.CONTENTDOM_AUDIO) ? "1" : "0");
        prop.put("input_contentdomCheckVideo", (contentdomCode == plasmaSearchQuery.CONTENTDOM_VIDEO) ? "1" : "0");
        prop.put("input_contentdomCheckImage", (contentdomCode == plasmaSearchQuery.CONTENTDOM_IMAGE) ? "1" : "0");
        prop.put("input_contentdomCheckApp", (contentdomCode == plasmaSearchQuery.CONTENTDOM_APP) ? "1" : "0");
        
        // for RSS: don't HTML encode some elements
        prop.putHTML("rss_query", querystring, true);
        prop.put("rss_queryenc", yacyURL.escape(querystring.replace(' ', '+')));

        sb.localSearchLastAccess = System.currentTimeMillis();
        
        // return rewrite properties
        return prop;
    }

    private static String navurla(int page, int display, plasmaSearchQuery theQuery) {
        return
        "<a href=\"yacysearch.html?display=" + display +
        "&amp;search=" + theQuery.queryString() +
        "&amp;count="+ theQuery.displayResults() +
        "&amp;offset=" + (page * theQuery.displayResults()) +
        "&amp;resource=" + theQuery.searchdom() +
        "&amp;time=" + (theQuery.maximumTime / 1000) +
        "&amp;urlmaskfilter=" + theQuery.urlMask +
        "&amp;prefermaskfilter=" + theQuery.prefer +
        "&amp;cat=href&amp;constraint=" + ((theQuery.constraint == null) ? "" : theQuery.constraint.exportB64()) +
        "&amp;contentdom=" + theQuery.contentdom() +
        "&amp;former=" + theQuery.queryString() + "\">";
    }
}