package org.mercury_im.messenger.core.connection;

import org.jivesoftware.smack.AbstractXMPPConnection;
import org.jivesoftware.smack.ConnectionListener;
import org.jivesoftware.smack.ReconnectionManager;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.chat2.ChatManager;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.roster.Roster;
import org.jivesoftware.smackx.carbons.CarbonManager;
import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
import org.jivesoftware.smackx.disco.packet.DiscoverInfo;
import org.jivesoftware.smackx.iqversion.VersionManager;
import org.jivesoftware.smackx.sid.StableUniqueStanzaIdManager;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import io.reactivex.subjects.BehaviorSubject;

public class MercuryConnection {

    public static final String TAG = "Mercury";

    private static final Logger LOGGER = Logger.getLogger(MercuryConnection.class.getName());

    protected final AbstractXMPPConnection connection;
    protected final long accountId;

    protected final ReconnectionManager reconnectionManager;
    protected final Roster roster;
    protected final ChatManager chatManager;
    protected final CarbonManager carbonManager;
    protected final StableUniqueStanzaIdManager stanzaIdManager;
    protected final ServiceDiscoveryManager serviceDiscoveryManager;

    BehaviorSubject<ConnectionState> state = BehaviorSubject.createDefault(ConnectionState.DISCONNECTED);


    public MercuryConnection(AbstractXMPPConnection connection, long accountId) {
        this.connection = connection;
        connection.addConnectionListener(connectionListener);
        this.accountId = accountId;

        reconnectionManager = ReconnectionManager.getInstanceFor(connection);
        reconnectionManager.enableAutomaticReconnection();

        this.roster = Roster.getInstanceFor(connection);
        roster.setRosterLoadedAtLogin(true);
        this.chatManager = ChatManager.getInstanceFor(connection);
        this.carbonManager = CarbonManager.getInstanceFor(connection);
        this.stanzaIdManager = StableUniqueStanzaIdManager.getInstanceFor(connection);
        stanzaIdManager.enable();

        this.serviceDiscoveryManager = ServiceDiscoveryManager.getInstanceFor(connection);
        VersionManager.setAutoAppendSmackVersion(false);
        VersionManager.getInstanceFor(connection).setVersion("Mercury", "0.0.1-stealth", "Android");
        serviceDiscoveryManager.setIdentity(new DiscoverInfo.Identity("client", "Mercury", "phone"));
    }

    public void connect() {
        LOGGER.log(Level.INFO, "Connecting...");
        state.onNext(ConnectionState.CONNECTING);
        AbstractXMPPConnection con = (AbstractXMPPConnection) getConnection();
        try {
            con.connect().login();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (SmackException e) {
            e.printStackTrace();
        } catch (XMPPException e) {
            e.printStackTrace();
        }
    }

    public void disconnect() {
        AbstractXMPPConnection con = (AbstractXMPPConnection) getConnection();
        state.onNext(ConnectionState.DISCONNECTING);
        try {
            con.disconnect(new Presence(Presence.Type.unavailable));
        } catch (SmackException.NotConnectedException e) {
            e.printStackTrace();
        }
        state.onNext(ConnectionState.DISCONNECTED);
    }

    public XMPPConnection getConnection() {
        return connection;
    }

    public long getAccountId() {
        return accountId;
    }

    public Roster getRoster() {
        return roster;
    }


    private final ConnectionListener connectionListener = new ConnectionListener() {

        @Override
        public void connected(XMPPConnection connection) {
            state.onNext(ConnectionState.CONNECTED);
        }

        @Override
        public void authenticated(XMPPConnection connection, boolean resumed) {
            state.onNext(ConnectionState.AUTHENTICATED);
            LOGGER.info("Connection " + getAccountId() + " authenticated (" + (resumed ? "resumed" : "initially") + ")");
            if (!resumed) {
                LOGGER.info("Enabling carbons!");
                carbonManager.enableCarbonsAsync(exception -> {
                    LOGGER.severe("Could not enable carbons for connection " + accountId + ": " + exception.getMessage());
                    exception.printStackTrace();
                });
            }
        }

        @Override
        public void connectionClosed() {
            state.onNext(ConnectionState.DISCONNECTED);
        }

        @Override
        public void connectionClosedOnError(Exception e) {
            state.onNext(ConnectionState.DISCONNECTED);
        }
    };
}