package org.mercury_im.messenger.service;

import android.app.Notification;
import android.app.PendingIntent;
import android.app.Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Binder;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.util.Log;
import android.util.LongSparseArray;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;

import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.chat2.Chat;
import org.jivesoftware.smack.chat2.ChatManager;
import org.jivesoftware.smack.chat2.IncomingChatMessageListener;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.roster.Roster;
import org.jivesoftware.smack.roster.RosterEntry;
import org.jivesoftware.smack.roster.RosterLoadedListener;
import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smack.tcp.XMPPTCPConnectionConfiguration;
import org.jivesoftware.smackx.ping.android.ServerPingWithAlarmManager;
import org.jxmpp.jid.EntityBareJid;
import org.mercury_im.messenger.MercuryImApplication;
import org.mercury_im.messenger.Notifications;
import org.mercury_im.messenger.R;
import org.mercury_im.messenger.persistence.model.AccountModel;
import org.mercury_im.messenger.persistence.repository.AccountRepository;
import org.mercury_im.messenger.persistence.repository.ContactRepository;
import org.mercury_im.messenger.persistence.room.AppDatabase;
import org.mercury_im.messenger.persistence.room.model.RoomAccountModel;
import org.mercury_im.messenger.persistence.room.model.RoomContactModel;
import org.mercury_im.messenger.ui.MainActivity;
import org.mercury_im.messenger.xmpp_android.ParcelableXMPPTCPConnectionConfiguration;

import java.io.IOException;
import java.util.List;
import java.util.Set;

import javax.inject.Inject;

/**
 * Started, Bound Service, which is responsible for managing {@link XMPPConnection XMPPConnections}
 * affiliated with registered accounts.
 */
public class XmppConnectionService extends Service {

    private static final String TAG = MercuryImApplication.TAG;

    private static final String APP = "org.olomono.mercury";
    private static final String SERVICE = APP + ".XmppConnectionService";

    private static final String ACTION = SERVICE + ".ACTION";
    private static final String EVENT = SERVICE + ".EVENT";
    private static final String EXTRA = SERVICE + ".EXTRA";
    private static final String STATUS = SERVICE + ".STATUS";

    // ACTIONS
    public static final String ACTION_START = ACTION + ".START";
    public static final String ACTION_STOP = ACTION + ".STOP";
    public static final String ACTION_CONNECT = ACTION + ".CONNECT";
    public static final String ACTION_DISCONNECT = ACTION + ".DISCONNECT";
    public static final String ACTION_PING = ACTION + ".PING";

    // EVENTS
    public static final String EVENT_INCOMING_MESSAGE = EVENT + ".INCOMING_MESSAGE";
    public static final String EVENT_OUTGOING_MESSAGE = EVENT + ".OUTGOING_MESSAGE";

    // EXTRAS
    public static final String EXTRA_CONFIGURATION = EXTRA + ".CONFIGURATION";
    public static final String EXTRA_ACCOUNT_ID = EXTRA + ".ACCOUNT_ID";

    // STATUSES
    public static final String STATUS_SUCCESS = STATUS + ".SUCCESS";
    public static final String STATUS_FAILURE = STATUS + ".FAILURE";


    @Inject
    ContactRepository rosterRepository;

    @Inject
    AccountRepository accountRepository;

    private final LongSparseArray<XMPPConnection> connections = new LongSparseArray<>();

    private Handler uiHandler;

    @NonNull
    @Override
    public final IBinder onBind(Intent intent) {
        return new Binder(this);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate()");
        MercuryImApplication.getApplication().getAppComponent().inject(this);

        // Begin life cycle of Ping Manager.
        // The Manager will automatically detect newly created connections and ping the server
        // every half hour if necessary.
        ServerPingWithAlarmManager.onCreate(this);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy()");

        // End life cycle of Ping Manager.
        ServerPingWithAlarmManager.onDestroy();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        if (uiHandler == null) {
            uiHandler = new Handler(Looper.getMainLooper()) {
                @Override
                public void handleMessage(android.os.Message msg) {
                    switch (msg.what) {
                        case 1:
                            Message m = (Message) msg.obj;
                            Toast.makeText(XmppConnectionService.this, (m.getFrom() != null ? m.getFrom().toString() : "null") + ": "
                                    + m.getBody(), Toast.LENGTH_LONG).show();
                    }
                }
            };
        }

        Log.d(TAG, "onStartCommand(" + intent + ")");
        if (intent == null) {
            startAndDisplayForegroundNotification();
        } else {
            String action = intent.getAction();
            action = action == null ? "" : action;

            switch (action) {
                case ACTION_START:
                    startAndDisplayForegroundNotification();
                    startConnections();
                    break;
                case ACTION_STOP:
                    stopForeground(true);
                    break;
                case ACTION_CONNECT:
                    ParcelableXMPPTCPConnectionConfiguration configuration = intent.getParcelableExtra(EXTRA_CONFIGURATION);
                    if (configuration == null) {
                        Log.e(TAG, "Configuration is null.");
                        return START_STICKY_COMPATIBILITY;
                    }

                    long accountId = intent.getLongExtra(EXTRA_ACCOUNT_ID, -1);
                    if (accountId == -1) {
                        Log.d(TAG, "No AccountID provided.");
                        return START_STICKY_COMPATIBILITY;
                    }

                    new Thread() {
                        public void run() {
                            XMPPConnection connection = startConnection(configuration, accountId);
                            connections.put(accountId, connection);
                        }
                    }.start();
                    break;
                default:
                    break;
            }
        }

        return START_STICKY_COMPATIBILITY;
    }

    public void startAndDisplayForegroundNotification() {
        Log.d(TAG, "startAndDisplayForegroundNotification()");
        Notification notification = getForegroundNotification(getApplicationContext(), connections.size());

        startForeground(Notifications.FOREGROUND_SERVICE_ID, notification);
    }

    static Notification getForegroundNotification(Context context, int numConnections) {
        Intent startMainActivityIntent = new Intent(context, MainActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
                startMainActivityIntent, 0);
        return new NotificationCompat.Builder(context, Notifications.NOTIFICATION_CHANNEL__FOREGROUND_SERVICE)
                .setContentTitle("Mercury")
                .setContentText(numConnections + " connections.")
                .setSmallIcon(R.drawable.ic_send_black_24dp)
                .setContentIntent(pendingIntent)
                .build();
    }

    public void startConnections() {
        new Thread() {
            @Override
            public void run() {
                synchronized (connections) {
                    List<RoomAccountModel> accounts = accountRepository.getAllAccounts();
                    if (accounts == null) return;

                    for (AccountModel a : accounts) {
                        if (connections.get(a.getId()) != null) {
                            continue;
                        }

                        // XMPPConnection connection = startConnection(a.getJid(), a.getPassword(), a.getId());
                        // connections.put(a.getId(), connection);
                    }
                }
            }
        }.start();
    }

    private XMPPConnection startConnection(ParcelableXMPPTCPConnectionConfiguration connectionConfiguration, long accountId) {
        XMPPTCPConnection con = null;
        try {
            XMPPTCPConnectionConfiguration conf = connectionConfiguration.getConfiguration();
            con = new XMPPTCPConnection(conf);
            con.connect().login();
        } catch (
                XMPPException e) {
            e.printStackTrace();
        } catch (
                SmackException e) {
            e.printStackTrace();
        } catch (
                IOException e) {
            e.printStackTrace();
        } catch (
                InterruptedException e) {
            e.printStackTrace();
        }

        NotificationManagerCompat.from(getApplicationContext()).notify(Notifications.FOREGROUND_SERVICE_ID,
                getForegroundNotification(getApplicationContext(), connections.size()));

        Roster roster = Roster.getInstanceFor(con);
        roster.addRosterLoadedListener(new RosterLoadedListener() {
            @Override
            public void onRosterLoaded(Roster roster) {
                Set<RosterEntry> entries = roster.getEntries();
                for (RosterEntry e : entries) {
                    Log.d(TAG, "Inserting Roster entry " + e.getJid().toString());

                    RoomContactModel contact = new RoomContactModel();
                    contact.setAccountId(accountId);
                    // TODO: Fix
                }
            }

            @Override
            public void onRosterLoadingFailed(Exception exception) {
                Log.d(TAG, "Roster Loading failed", exception);
            }
        });

        try {
            roster.reload();
        } catch (SmackException.NotLoggedInException e) {
            e.printStackTrace();
        } catch (SmackException.NotConnectedException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        ChatManager chatManager = ChatManager.getInstanceFor(con);
        chatManager.addIncomingListener(new IncomingChatMessageListener() {
            @Override
            public void newIncomingMessage(EntityBareJid from, Message message, Chat chat) {
                android.os.Message msg = uiHandler.obtainMessage(1, message);
                msg.sendToTarget();
            }
        });

        return con;
    }

    public XMPPConnection getConnection(long accountId) {
        return connections.get(accountId);
    }

    public void putConnection(int accountId, XMPPConnection connection) {
        connections.put(accountId, connection);
    }

    public class Binder extends android.os.Binder {

        private final XmppConnectionService service;

        public Binder(XmppConnectionService service) {
            this.service = service;
        }

        public XmppConnectionService getService() {
            return service;
        }
    }
}