package com.rubenvandeven.heartbeatstreamer.heartrate;

import android.app.AlertDialog;
import android.app.Service;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
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.R;

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.EnumSet;

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_SOCKET_SENT = "com.rubenvandeven.heartbeat.broadcast.socket_sent";

    AsyncScanController<AntPlusHeartRatePcc> hrScanCtrl;

    AntPlusHeartRatePcc hrPcc;
    PccReleaseHandle<AntPlusHeartRatePcc> releaseHandle;
    String lastMsg = "";

    public static boolean isRunning = false;

    @Override
    public void onCreate() {
        isRunning = true;
        requestAccessToPcc();
    }

    /**
     * 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);
        return START_STICKY;
    }

    protected AntPluginPcc.IDeviceStateChangeReceiver stateChangeReceiver =
            new AntPluginPcc.IDeviceStateChangeReceiver()
            {
                @Override
                public void onDeviceStateChange(final DeviceState state)
                {
                    if(DeviceState.DEAD.equals(state) || DeviceState.CLOSED.equals(state)) {
                        sendBroadcast(new Intent(BROADCAST_MONITOR_DISCONNECTED));
                        waitAndReconnect();
                    } else if (DeviceState.TRACKING.equals(state)) {
                        sendBroadcast(new Intent(BROADCAST_MONITOR_CONNECTED));
                    } else {
                        Intent i = new Intent(BROADCAST_MONITOR_UNKNOWN);
                        i.putExtra("status", 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...");
                    switch (resultCode) {
                        case SUCCESS:
                            connectHr(result);
                            break;
                        case CHANNEL_NOT_AVAILABLE:
                            showNotification("Channel Not Available");
                            break;
                        case OTHER_FAILURE:
                            showNotification("RequestAccess failed. See logcat for details.");
                            break;
                        case USER_CANCELLED:
                            showNotification("Cancelled. Do reset.");
                            break;
                        case UNRECOGNIZED:
                        default:
                            showNotification("Unknown error. Do reset.");
                            break;
                    }
                }
            };

    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)
            {
                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)) ? "*" : "");

                final String msg = String.format("{\"rate\":\"%s\", \"count\":\"%s\", \"time\":\"%s\"}", textHeartRate, textHeartBeatCount, textHeartBeatEventTime);

                if(msg.contentEquals(lastMsg)) {
                    Log.i(TAG, "Skip duplicate");
                    return;
                }
                lastMsg = msg;

                sendResult(msg);
            }
        });

    }


    private void sendResult(String msg) {
        Log.d(TAG, "Send: " + msg);
        final String m = msg;
        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: retry in 30s - ie. after internet loss
                    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();
            }
        });
    }

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

    /**
     * Requests the ANT+ device
     */
    protected void requestAccessToPcc()
    {
        if(hrPcc != null) {
            hrPcc.subscribeHeartRateDataEvent(null);
        }
        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() {
        if(releaseHandle != null)
        {
            releaseHandle.close();
        }
        isRunning = false;
        super.onDestroy();
    }

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