package com.juick.xmpp.s2s;

import org.xmlpull.mxp1.MXParser;
import org.xmlpull.v1.XmlPullParser;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.channels.AsynchronousSocketChannel;
import java.util.Date;
import java.util.logging.Logger;

/**
 *
 * @author ugnich
 */
public class Connection {

    protected static final Logger LOGGER = Logger.getLogger(Connection.class.getName());

    public String streamID;
    public long tsCreated = 0;
    public long tsLocalData = 0;
    public long bytesLocal = 0;
    public long packetsLocal = 0;
    AsynchronousSocketChannel socket;
    final XmlPullParser parser = new MXParser();
    OutputStreamWriter writer;

    public Connection() {
        tsCreated = System.currentTimeMillis();
    }

    public void logParser() {
        if (streamID == null) {
            return;
        }
        String tag = "IN: <" + parser.getName();
        for (int i = 0; i < parser.getAttributeCount(); i++) {
            tag += " " + parser.getAttributeName(i) + "=\"" + parser.getAttributeValue(i) + "\"";
        }
        tag += ">...</" + parser.getName() + ">\n";
        LOGGER.fine(tag);
    }

    public void sendStanza(String xml) throws IOException {
        if (streamID != null) {
            LOGGER.fine("OUT: " + xml + "\n");
        }
        writer.write(xml);
        writer.flush();
        tsLocalData = System.currentTimeMillis();
        bytesLocal += xml.length();
        packetsLocal++;
    }

    void closeConnection() {
        if (streamID != null) {
            LOGGER.info(String.format("CLOSING STREAM %s", streamID));
        }

        try {
            writer.write("</stream:stream>");
        } catch (Exception e) {
        }

        try {
            writer.close();
        } catch (Exception e) {
        }

        try {
            socket.close();
        } catch (Exception e) {
        }
    }

    static String generateDialbackKey(String to, String from, String id) throws Exception {
        Mac hmacSha256 = Mac.getInstance("hmacSHA256");

        SecretKeySpec secret_key = new SecretKeySpec("$UppPerSeCCret4".getBytes(), "SHA-256");
        hmacSha256.init(secret_key);
        byte key[] = hmacSha256.doFinal((to + " " + from + " " + id).getBytes());

        StringBuilder hexkey = new StringBuilder();
        for (int i = 0; i < key.length; i++) {
            hexkey.append(Integer.toHexString(0xFF & key[i]));
        }

        return hexkey.toString();
    }
}