package com.rubenvandeven.heartbeatstreamer.heartrate;

import android.app.AlertDialog;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.VibrationEffect;
import android.os.Vibrator;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import com.dsi.ant.plugins.antplus.pcc.AntPlusHeartRatePcc;
import com.dsi.ant.plugins.antplus.pcc.defines.DeviceState;
import com.dsi.ant.plugins.antplus.pcc.defines.EventFlag;
import com.dsi.ant.plugins.antplus.pcc.defines.RequestAccessResult;
import com.dsi.ant.plugins.antplus.pccbase.AntPluginPcc;
import com.dsi.ant.plugins.antplus.pccbase.AsyncScanController;
import com.dsi.ant.plugins.antplus.pccbase.PccReleaseHandle;
import com.koushikdutta.async.future.Future;
import com.koushikdutta.async.http.AsyncHttpClient;
import com.koushikdutta.async.http.WebSocket;
import com.rubenvandeven.heartbeatstreamer.MainActivity;
import com.rubenvandeven.heartbeatstreamer.R;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.EnumSet;
import java.util.Timer;
import java.util.TimerTask;

public class HeartRateService extends Service {
    private static final String TAG = HeartRateService.class.getSimpleName();

    public static final String BROADCAST_MONITOR_CONNECTED = "com.rubenvandeven.heartbeat.broadcast.monitor_started";
    public static final String BROADCAST_MONITOR_DISCONNECTED = "com.rubenvandeven.heartbeat.broadcast.monitor_stopped";
    public static final String BROADCAST_MONITOR_UNKNOWN = "com.rubenvandeven.heartbeat.broadcast.monitor_unknown";
    public static final String BROADCAST_MONITOR_UPDATE = "com.rubenvandeven.heartbeat.broadcast.monitor_update";
    public static final String BROADCAST_MONITOR_CONNECT_ATTEMPT = "com.rubenvandeven.heartbeat.broadcast.connect_attempt";
    public static final String BROADCAST_MONITOR_CONNECT_RESULT = "com.rubenvandeven.heartbeat.broadcast.connect_reslt";
    public static final String BROADCAST_SOCKET_SENT = "com.rubenvandeven.heartbeat.broadcast.socket_sent";
    public static final String BROADCAST_SERVICE_START = "com.rubenvandeven.heartbeat.broadcast.service_start";
    public static final String BROADCAST_SERVICE_STOPPED = "com.rubenvandeven.heartbeat.broadcast.service_stopped";
    public static final String BROADCAST_BEAT = "com.rubenvandeven.heartbeat.broadcast.beat";
    public static final String ACTION_START = "com.rubenvandeven.heartbeat.service_start";
    public static final String ACTION_STOP = "com.rubenvandeven.heartbeat.service_stop";
    public static final int NOTIFICATION_ID = 101;

    AsyncScanController<AntPlusHeartRatePcc> hrScanCtrl;

    AntPlusHeartRatePcc hrPcc;
    PccReleaseHandle<AntPlusHeartRatePcc> releaseHandle;
    JSONObject lastMsg = null;

    public static boolean isRunning = false;

    NotificationCompat.Builder builder;
    NotificationManager notificationManager;

    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    Timer lifelineTimer;
    DeviceState currentDeviceState;

    boolean restartService = false;


    @Override
    public void onCreate() {
        notificationManager =
                (NotificationManager) getSystemService(Service.NOTIFICATION_SERVICE);
        startLifelineTimer();
        setRunning(true);

        requestAccessToPcc();
    }

    public void setRunning(boolean running) {
        if(running == isRunning) {
            return;
        }
        isRunning = running;
        Intent i;
        if(running) {
            i = new Intent(BROADCAST_SERVICE_START);
        } else {
            i = new Intent(BROADCAST_SERVICE_STOPPED);
        }
        sendBroadcast(i);
    }

    /**
     * Start main thread, request location updates, start synchronization.
     *
     * @param intent Intent
     * @param flags Flags
     * @param startId Unique id
     * @return Always returns START_STICKY
     */
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
            Log.i(TAG, "Received start id " + startId + ": " + intent);
            Intent notificationIntent = new Intent(this, MainActivity.class);
            notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                    | Intent.FLAG_ACTIVITY_CLEAR_TASK);
            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
                    notificationIntent, 0);

            builder = new NotificationCompat.Builder(this)
                    .setContentText("Starting")
                    .setContentTitle("Heartbeat Streamer")
                    .setSmallIcon(R.drawable.ic_notification)
                    .setAutoCancel(false)
                    .setOngoing(true)
                    .setOnlyAlertOnce(false)
                    .setContentIntent(pendingIntent)
                    ;

            startForeground(NOTIFICATION_ID,
                    builder.build());

        return START_STICKY;
    }

    protected AntPluginPcc.IDeviceStateChangeReceiver stateChangeReceiver =
            new AntPluginPcc.IDeviceStateChangeReceiver()
            {
                @Override
                public void onDeviceStateChange(final DeviceState state)
                {
                    currentDeviceState = state;
                    if(DeviceState.DEAD.equals(state) || DeviceState.CLOSED.equals(state)) {
                        sendBroadcast(new Intent(BROADCAST_MONITOR_DISCONNECTED));
                        updateNotification("Disconnected");
                        waitAndReconnect();
                    } else if (DeviceState.TRACKING.equals(state)) {
                        sendBroadcast(new Intent(BROADCAST_MONITOR_CONNECTED));
                        updateNotification("Connected!");
                    } else {
                        Intent i = new Intent(BROADCAST_MONITOR_UNKNOWN);
                        i.putExtra("status", state.getIntValue());
                        updateNotification("Unknown status: "+ String.valueOf(state.getIntValue()));
                        sendBroadcast(i);
                    }
                }
            };

    protected AntPluginPcc.IPluginAccessResultReceiver<AntPlusHeartRatePcc> resultReceiver =
            new AntPluginPcc.IPluginAccessResultReceiver<AntPlusHeartRatePcc>() {
                //Handle the result, connecting to events on success or reporting failure to user.
                @Override
                public void onResultReceived(AntPlusHeartRatePcc result, RequestAccessResult resultCode,
                                             DeviceState initialDeviceState) {
//                    showDataDisplay("Connecting...");
                    Intent i = new Intent(BROADCAST_MONITOR_CONNECT_RESULT);
                    switch (resultCode) {
                        case SUCCESS:
                            i.putExtra("msg", "Success");
                            updateNotification("Access");
                            connectHr(result);
                            break;
                        case CHANNEL_NOT_AVAILABLE:
                            showNotification("Channel Not Available");
                            i.putExtra("msg", "Channel Not Available");
                            updateNotification("Channel not available");
                            break;
                        case OTHER_FAILURE:
                            showNotification("RequestAccess failed. See logcat for details.");
                            i.putExtra("msg", "RequestAccess failed. See logcat for details.");
                            updateNotification("RequestAccess failed");
                            break;
                        case USER_CANCELLED:
                            showNotification("Cancelled. Do reset.");
                            i.putExtra("msg", "Cancelled. Do reset.");
                            updateNotification("Cancelled, do reset");
                            break;
                        case UNRECOGNIZED:
                        default:
                            showNotification("Unknown error. Do reset.");
                            i.putExtra("msg", "unknown error. Do reset.");
                            updateNotification("Unknown error, do reset");
                            break;
                    }
                    sendBroadcast(i);
                }
            };

    private void connectHr(AntPlusHeartRatePcc result) {
        hrPcc = result; // keep track of current connection
        hrPcc.subscribeHeartRateDataEvent(new AntPlusHeartRatePcc.IHeartRateDataReceiver()
        {
            @Override
            public void onNewHeartRateData(final long estTimestamp, EnumSet<EventFlag> eventFlags,
                                           final int computedHeartRate, final long heartBeatCount,
                                           final BigDecimal heartBeatEventTime, final AntPlusHeartRatePcc.DataState dataState)
            {
                currentDeviceState = DeviceState.TRACKING;

                DecimalFormatSymbols otherSymbols = new DecimalFormatSymbols();
                otherSymbols.setDecimalSeparator('.');
                DecimalFormat df = new DecimalFormat("#.##", otherSymbols);

                // Mark heart rate with asterisk if zero detected
                final String textHeartRate = String.valueOf(computedHeartRate)
                        + ((AntPlusHeartRatePcc.DataState.ZERO_DETECTED.equals(dataState)) ? "*" : "");


                // Mark heart beat count and heart beat event time with asterisk if initial value
                final String textHeartBeatCount = String.valueOf(heartBeatCount)
                        + ((AntPlusHeartRatePcc.DataState.INITIAL_VALUE.equals(dataState)) ? "*" : "");
                final String textHeartBeatEventTime = df.format(heartBeatEventTime)
                        + ((AntPlusHeartRatePcc.DataState.INITIAL_VALUE.equals(dataState)) ? "*" : "");

                Intent intent = new Intent(BROADCAST_BEAT);
                intent.putExtra("rate", textHeartRate);
                intent.putExtra("count", textHeartBeatCount);
                intent.putExtra("time", textHeartBeatEventTime);
                sendBroadcast(intent);

                updateNotification(textHeartRate + " bpm / " + textHeartBeatCount + " beats / " + textHeartBeatEventTime );


                JSONObject jObjectData = new JSONObject();
                //                final String msg = String.format("{\"rate\":\"%s\", \"count\":\"%s\", \"time\":\"%s\"}", textHeartRate, textHeartBeatCount, textHeartBeatEventTime);
                final String msg;
                try {
                    jObjectData.put("rate", textHeartRate);
                    jObjectData.put("count", textHeartBeatCount);
                    jObjectData.put("time", textHeartBeatEventTime);
                    jObjectData.put("timestamp", dateFormat.format(new Date()));
                    jObjectData.put("token", getToken());

                    msg = jObjectData.toString();


                    if(lastMsg != null && lastMsg.getString("time").equals(jObjectData.getString("time"))) {
                        Log.i(TAG, "Skip duplicate");
                        return;
                    }
                    lastMsg = jObjectData;

                    sendResult(jObjectData.toString());

                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        });

    }

    public void updateNotification(String msg) {
        builder.setContentText(msg);
        notificationManager.notify(NOTIFICATION_ID, builder.build());
    }


    String token = null;
    /**
     * Get the token for use with the syncing.
     * @return
     */
    public String getToken() {
        if(token != null) {
            return token;
        }

        String json = null;
        try {
            InputStream is = getAssets().open("token.json");
            int size = is.available();
            byte[] buffer = new byte[size];
            is.read(buffer);
            is.close();
            json = new String(buffer, "UTF-8");
        } catch (IOException ex) {
            ex.printStackTrace();
            return null;
        }
        try {
            Log.d(TAG, "JSON: "+ json);
            JSONObject jsonObject = new JSONObject(json);
            token = jsonObject.getString("token");
        } catch (JSONException e) {
            e.printStackTrace();
            return null;
        }
        return token;
    }


    private void sendResult(final String m) {
        Log.d(TAG, "Send: " + m);
        Future<WebSocket> fws = AsyncHttpClient.getDefaultInstance().websocket("ws://heartbeat.rubenvandeven.com:8888/ws", "my-protocol", new AsyncHttpClient.WebSocketConnectCallback() {
            @Override
            public void onCompleted(Exception ex, final WebSocket webSocket) {
                if (ex != null) {
                    ex.printStackTrace();
                    // TODO: store for later sync
                    return;
                }
                webSocket.send(m);
                Intent intent = new Intent(BROADCAST_SOCKET_SENT);
                intent.putExtra("msg", m);
                sendBroadcast(intent);
                webSocket.close();
            }
        });
    }

    private void showNotification(String msg) {
        final String m = msg;
        Handler handler = new Handler(Looper.getMainLooper());
        handler.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(HeartRateService.this.getApplicationContext(),m,Toast.LENGTH_SHORT).show();
            }
        });
    }

    protected void startLifelineTimer() {
        lifelineTimer = new Timer();

        lifelineTimer.scheduleAtFixedRate(new TimerTask(){
            @Override
            public void run(){
                Log.d(TAG, "A Kiss every 10 seconds");
                if(DeviceState.TRACKING.equals(currentDeviceState)) {
                    Log.i(TAG, "Alive and kicking!");
                    return;
                }
                Log.w(TAG, "Device status different... ");
                String val;
                if(currentDeviceState == null) {
                    val = "null";
                } else {
                    val = String.valueOf(currentDeviceState.getIntValue());
                }
                Log.w(TAG, "Device status: '"+ val +"'");

                // something is off: warn & attempt restart
                Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    v.vibrate(VibrationEffect.createOneShot(1000, VibrationEffect.DEFAULT_AMPLITUDE));
                } else {
                    //deprecated in API 26
                    v.vibrate(1000);
                }
                restart();
            }
        },20000,10000);

    }

    /**
     * wait to reconnect to dead HR-monitor
     */
    protected void waitAndReconnect() {
        Log.d(TAG, "Wait & reconnect");

        if(hrPcc != null) {
            hrPcc.subscribeHeartRateDataEvent(null);
        }

//        triggers: "sending message to a handler on a dead thread"
//        new android.os.Handler().postDelayed(
//            new Runnable() {
//                public void run() {
//                    Log.i(TAG, "Attempt reconnect");
        requestAccessToPcc();
//                }
//            },
//        20000); // 20 sec delay for connection
    }

    protected void restart(){
        restartService = true;
        stopSelf();
    }

    /**
     * Requests the ANT+ device
     */
    protected void requestAccessToPcc()
    {
//        if(hrPcc != null) {
//            hrPcc.subscribeHeartRateDataEvent(null);
//        }
        Log.d(TAG, "Request Access To PCC");
        sendBroadcast( new Intent(BROADCAST_MONITOR_CONNECT_ATTEMPT) );
        releaseHandle = AntPlusHeartRatePcc.requestAccess(this, 4818, 0, resultReceiver, stateChangeReceiver);
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    @Override
    public void onDestroy() {
        Log.i(TAG, "Stop service");
        stopForeground(true);
        lifelineTimer.cancel();
        if(releaseHandle != null)
        {
            releaseHandle.close();
        }
        setRunning(false);
        super.onDestroy();

        if(restartService ) {
            startService(new Intent(this, HeartRateService.class));
        }
    }

    public static boolean isRunning() {
        return isRunning;
    }
}