package eu.siacs.conversations.xmpp.jingle;

import java.math.BigInteger;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import android.util.Log;

import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Message;
import eu.siacs.conversations.services.XmppConnectionService;
import eu.siacs.conversations.xml.Element;
import eu.siacs.conversations.xmpp.OnIqPacketReceived;
import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
import eu.siacs.conversations.xmpp.stanzas.IqPacket;

public class JingleConnectionManager {

	private XmppConnectionService xmppConnectionService;

	private List<JingleConnection> connections = new ArrayList<JingleConnection>();

	private HashMap<String, JingleCandidate> primaryCandidates = new HashMap<String, JingleCandidate>();

	private SecureRandom random = new SecureRandom();

	public JingleConnectionManager(XmppConnectionService service) {
		this.xmppConnectionService = service;
	}

	public void deliverPacket(Account account, JinglePacket packet) {
		if (packet.isAction("session-initiate")) {
			JingleConnection connection = new JingleConnection(this);
			connection.init(account,packet);
			connections.add(connection);
		} else {
			for (JingleConnection connection : connections) {
				if (connection.getAccountJid().equals(account.getFullJid()) && connection
						.getSessionId().equals(packet.getSessionId()) && connection
						.getCounterPart().equals(packet.getFrom())) {
					connection.deliverPacket(packet);
					return;
				}
			}
			Log.d("xmppService","delivering packet failed "+packet.toString());
		}
	}

	public JingleConnection createNewConnection(Message message) {
		JingleConnection connection = new JingleConnection(this);
		connection.init(message);
		connections.add(connection);
		return connection;
	}

	public JingleConnection createNewConnection(JinglePacket packet) {
		JingleConnection connection = new JingleConnection(this);
		connections.add(connection);
		return connection;
	}

	public XmppConnectionService getXmppConnectionService() {
		return this.xmppConnectionService;
	}

	public void getPrimaryCandidate(Account account,
			final OnPrimaryCandidateFound listener) {
		if (!this.primaryCandidates.containsKey(account.getJid())) {
			String xmlns = "http://jabber.org/protocol/bytestreams";
			final String proxy = account.getXmppConnection()
					.findDiscoItemByFeature(xmlns);
			if (proxy != null) {
				IqPacket iq = new IqPacket(IqPacket.TYPE_GET);
				iq.setTo(proxy);
				iq.query(xmlns);
				account.getXmppConnection().sendIqPacket(iq,
						new OnIqPacketReceived() {

							@Override
							public void onIqPacketReceived(Account account,
									IqPacket packet) {
								Element streamhost = packet
										.query()
										.findChild("streamhost",
												"http://jabber.org/protocol/bytestreams");
								if (streamhost != null) {
									JingleCandidate candidate = new JingleCandidate(nextRandomId(),true);
									candidate.setHost(streamhost.getAttribute("host"));
									candidate.setPort(Integer.parseInt(streamhost.getAttribute("port")));
									candidate.setType(JingleCandidate.TYPE_PROXY);
									candidate.setJid(proxy);
									candidate.setPriority(655360+65535);
									primaryCandidates.put(account.getJid(),
											candidate);
									listener.onPrimaryCandidateFound(true,
											candidate);
								} else {
									listener.onPrimaryCandidateFound(false,
											null);
								}
							}
						});
			} else {
				listener.onPrimaryCandidateFound(false, null);
			}

		} else {
			listener.onPrimaryCandidateFound(true,
					this.primaryCandidates.get(account.getJid()));
		}
	}

	public String nextRandomId() {
		return new BigInteger(50, random).toString(32);
	}
	
	public long getAutoAcceptFileSize() {
		String config = this.xmppConnectionService.getPreferences().getString("auto_accept_file_size", "524288");
		try {
			return Long.parseLong(config);
		} catch (NumberFormatException e) {
			return 524288;
		}
	}
}