import java.util.Date;

import de.anomic.content.RSSMessage;
import de.anomic.document.parser.xml.RSSFeed;
import de.anomic.http.httpRequestHeader;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;

public class feed {
 
    public static serverObjects respond(final httpRequestHeader header, final serverObjects post, final serverSwitch env) {
        final plasmaSwitchboard sb = (plasmaSwitchboard) env;

        // insert default values
        final serverObjects prop = new serverObjects();
        prop.put("channel_title", "");
        prop.put("channel_description", "");
        prop.put("channel_pubDate", "");
        prop.put("item", "0");

        if ((post == null) || (env == null)) return prop;
        final boolean authorized = sb.verifyAuthentication(header, false);

        final String channelNames = post.get("set");
        if (channelNames == null) return prop;
        final String[] channels = channelNames.split(","); // several channel names can be given and separated by comma

        int messageCount = 0;
        int messageMaxCount = Math.min(post.getInt("count", 100), 1000);

        RSSFeed feed;
        channelIteration: for (int channelIndex = 0; channelIndex < channels.length; channelIndex++) {
            // prevent that unauthorized access to this servlet get results from private data
            if ((!authorized) && (RSSFeed.privateChannels.contains(channels[channelIndex]))) continue channelIteration; // allow only public channels if not authorized

            if (channels[channelIndex].equals("TEST")) {
                // for interface testing return at least one single result
                prop.putXML("channel_title", "YaCy News Testchannel");
                prop.putXML("channel_description", "");
                prop.put("channel_pubDate", (new Date()).toString());
                prop.putXML("item_" + messageCount + "_title", channels[channelIndex] + ": " + "YaCy Test Entry " + (new Date()).toString());
                prop.putXML("item_" + messageCount + "_description", "abcdefg");
                prop.putXML("item_" + messageCount + "_link", "http://yacy.net");
                prop.put("item_" + messageCount + "_pubDate", (new Date()).toString());
                prop.put("item_" + messageCount + "_guid", System.currentTimeMillis());
                messageCount++;
                messageMaxCount--;
                continue channelIteration;
            }
            
            // read the channel
            feed = RSSFeed.channels(channels[channelIndex]);
            if ((feed == null) || (feed.size() == 0)) continue channelIteration;

            RSSMessage message = feed.getChannel();
            if (message != null) {
                prop.putXML("channel_title", message.getTitle());
                prop.putXML("channel_description", message.getDescription());
                prop.put("channel_pubDate", message.getPubDate());
            }
            while ((messageMaxCount > 0) && (feed.size() > 0)) {
                message = feed.pollMessage();
                if (message == null) continue;

                // create RSS entry
                prop.putXML("item_" + messageCount + "_title", channels[channelIndex] + ": " + message.getTitle());
                prop.putXML("item_" + messageCount + "_description", message.getDescription());
                prop.putXML("item_" + messageCount + "_link", message.getLink());
                prop.put("item_" + messageCount + "_pubDate", message.getPubDate());
                prop.put("item_" + messageCount + "_guid", message.getGuid());
                messageCount++;
                messageMaxCount--;
            }
            if (messageMaxCount == 0) break channelIteration;
        }
        prop.put("item", messageCount);

        // return rewrite properties
        return prop;
    }
 
}