package xml;

import java.net.MalformedURLException;
import java.util.Set;
import java.util.TreeSet;

import de.anomic.http.httpHeader;
import de.anomic.plasma.plasmaURL;
import de.anomic.kelondro.kelondroMSetTools;
import de.anomic.net.URL;
import de.anomic.plasma.plasmaCondenser;
import de.anomic.plasma.plasmaSearchQuery;
import de.anomic.plasma.plasmaSnippetCache;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
import de.anomic.server.logging.serverLog;

public class snippet {
    public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) throws MalformedURLException {
        // return variable that accumulates replacements
        plasmaSwitchboard switchboard = (plasmaSwitchboard) env;
        serverObjects prop = new serverObjects();
        
        // getting url
        String urlString = post.get("url", "");
        URL url = new URL(urlString);
        
        // if 'remove' is set to true, then RWI references to URLs that do not have the snippet are removed
        boolean remove = post.get("remove", "false").equals("true");
        
        // boolean line_end_with_punctuation
        boolean pre = post.get("pre", "false").equals("true");
        
        String querystring = post.get("search", "").trim();
        if ((querystring.length() > 2) && (querystring.charAt(0) == '"') && (querystring.charAt(querystring.length() - 1) == '"')) {
            querystring = querystring.substring(1, querystring.length() - 1).trim();
        }        
        final TreeSet query = plasmaSearchQuery.cleanQuery(querystring);
        
        // filter out stopwords
        final TreeSet filtered = kelondroMSetTools.joinConstructive(query, plasmaSwitchboard.stopwords);
        if (filtered.size() > 0) {
            kelondroMSetTools.excludeDestructive(query, plasmaSwitchboard.stopwords);
        }        
        
        // find snippet
        Set queryHashes = plasmaCondenser.words2hashes(query);        
        plasmaSnippetCache.Snippet snippet = switchboard.snippetCache.retrieveSnippet(url, queryHashes, true, pre, 260, 10000);
        prop.put("status",snippet.getSource());
        if (snippet.getSource() < 11) {
            //prop.put("text", (snippet.exists()) ? snippet.getLineMarked(queryHashes) : "unknown");
            prop.put("text", (snippet.exists()) ? "<![CDATA["+snippet.getLineMarked(queryHashes)+"]]>" : "unknown"); 
        } else {
            String error = snippet.getError();
            if ((remove) && (error.equals("no matching snippet found"))) {
                serverLog.logInfo("snippet-fetch", "no snippet found, remove words '" + querystring + "' for url = " + url.toNormalform());
                switchboard.wordIndex.removeReferences(query, plasmaURL.urlHash(url));
            }
            prop.put("text", error);
        }
        prop.put("urlHash",plasmaURL.urlHash(url));
        
        // attach link information
        prop.put("links", 0);
        
        
        // return rewrite properties
        return prop;
    }
}