// hello.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: 30.06.2004
//
// 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 hello.java
// if the shell's current path is HTROOT

import java.util.Date;

import de.anomic.http.httpHeader;
import de.anomic.server.serverCore;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
import de.anomic.yacy.yacyClient;
import de.anomic.yacy.yacyCore;
import de.anomic.yacy.yacySeed;

public class hello {

    public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
	serverObjects prop = new serverObjects(); // return variable that accumulates replacements

	if ((post == null) ||
            (env == null) ||
            (yacyCore.seedDB == null) ||
            (yacyCore.seedDB.mySeed == null)) return new serverObjects();

	String iam     = (String) post.get("iam","");      // complete seed of the requesting peer
	String key     = (String) post.get("key","");      // transmission key for response
	String seed    = (String) post.get("seed","");     // 
	String pattern = (String) post.get("pattern","");  // 
	String countStr= (String) post.get("count","0");   // 
        String mytime  = (String) post.get("mytime","");   // 
	int    count   = 0;
	try {count = (countStr == null) ? 0 : Integer.parseInt(countStr);} catch (NumberFormatException e) {count = 0;}
        Date remoteTime = yacyCore.parseUniversalDate((String) post.get("mytime")); // read remote time
	yacySeed remoteSeed = yacySeed.genRemoteSeed(seed, key, remoteTime);

	//System.out.println("YACYHELLO: REMOTESEED=" + ((remoteSeed == null) ? "NULL" : remoteSeed.toString()));
	if (remoteSeed == null) return new serverObjects();

	// we easily know the caller's IP:
	String yourip = (String) header.get("CLIENTIP", "<unknown>"); // read an artificial header addendum
	//System.out.println("YACYHELLO: YOUR IP=" + yourip);
	prop.put("yourip", yourip);
	remoteSeed.put("IP", yourip);

	// now let's check if the calling peer can be reached and answers
	int port = Integer.parseInt((String) remoteSeed.get("Port", "8080"));
	int urls = yacyClient.queryUrlCount(remoteSeed);
	if (urls >= 0) {
	    if (remoteSeed.get("PeerType", "senior") == null) {
		prop.put("yourtype", "senior");
		remoteSeed.put("PeerType", "senior");
	    } else if (remoteSeed.get("PeerType", "principal").equals("principal")) {
		prop.put("yourtype", "principal");
	    } else {
		prop.put("yourtype", "senior");
		remoteSeed.put("PeerType", "senior");
	    }
	    // connect the seed
	    yacyCore.peerActions.peerArrival(remoteSeed, true);
	} else {
	    prop.put("yourtype", "junior");
            remoteSeed.put("LastSeen", yacyCore.universalDateShortString());
	    yacyCore.peerActions.juniorConnects++; // update statistics
	    remoteSeed.put("PeerType", "junior");
	    yacyCore.log.logInfo("hello: responded remote junior peer '" + remoteSeed.getName() + "' from " + yourip + ":" + port);
	    // no connection here, instead store junior in connection cache
	    if ((remoteSeed.hash != null) && (remoteSeed.isProper())) yacyCore.peerActions.peerPing(remoteSeed);
	}

        String seeds = "";
        
	// attach also my own seed
        seeds += "seed0=" + yacyCore.seedDB.mySeed.genSeedStr(key) + serverCore.crlfString;

	// attach some more seeds, as requested
	if (yacyCore.seedDB != null) {
	    if (count > yacyCore.seedDB.sizeConnected()) count = yacyCore.seedDB.sizeConnected();
	    if (count > 100) count = 100;
	    yacySeed[] ys = yacyCore.seedDB.seedsByAge(true, count); // latest seeds
	    int c = 1;
	    for (int i = 1; i < ys.length; i++) {
		if ((ys[i] != null) && (ys[i].isProper())) {
                    seeds += "seed" + c + "=" + ys[i].genSeedStr(key) + serverCore.crlfString;
		    c++;
		}
	    }
	}

        prop.put("mytime", yacyCore.universalDateShortString());
        prop.put("seedlist", seeds);
	// return rewrite properties
	return prop;
    }

}