package com.example.meinwald.ui.area;


import android.Manifest;
import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

import com.example.meinwald.BuildConfig;
import com.google.android.gms.maps.model.LatLng;

import java.util.ArrayList;
import java.util.List;

import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

//import static com.name.name.MapsActivity.NOTIFICATION_ID;

public class LocationService extends Service implements LocationListener {

    private static final String TAG = "LocationService";

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;
    private boolean mLocationPermissionGranted;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    private List<LatLng> positions;

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 1; // 5 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 1 * 1; // 5 seconds

    // Declaring a Location Manager
    protected LocationManager mLocationManager;

    public LocationService(Context context) {

        if (BuildConfig.DEBUG) {
            Log.d(TAG, "LocationService(Context context)");
        }

        this.mContext = context;
        this.positions = new ArrayList<>();
        this.mLocationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);

        getLocationPermission();

        try {
            // getting GPS status
            isGPSEnabled = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled

                Log.d(TAG,"No permission to get location from any provider!");

                if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {


                }

            }
            else
            {
                Log.d(TAG,"Permission to get location from any provider!");

                this.canGetLocation = true;
                // First get location from Network Provider
                if (isNetworkEnabled) {
                    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                        Log.d(TAG,"No permission to get location from network provider!");
                    }

                    if (BuildConfig.DEBUG)
                    {
                        Log.d(TAG, "getLocation() requestLocationUpdates() from GPS");
                    }

                    mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                    if (mLocationManager != null) {
                        location = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                        if (location != null) {
                            positions.add(new LatLng(location.getLatitude(), location.getLongitude()));
                            if (BuildConfig.DEBUG)
                            {
                                Log.d(TAG, "getLocation() new location added");
                            }
                        }
                    }
                }

                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled && mLocationPermissionGranted) {
                    if (location == null) {
                        if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                            Log.d(TAG,"No permission to get location from gps provider!");
                        }

                        if (BuildConfig.DEBUG)
                        {
                            Log.d(TAG, "getLocation() requestLocationUpdates() from GPS");
                        }

                        mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                        if (mLocationManager != null) {
                            location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                positions.add(new LatLng(location.getLatitude(), location.getLongitude()));
                                if (BuildConfig.DEBUG)
                                {
                                    Log.d(TAG, "getLocation() new location added");
                                }
                            }
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public void getLocation() {

        if (BuildConfig.DEBUG) {
            Log.d(TAG, "getLocation()");
        }

            }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(mLocationManager != null){
            mLocationManager.removeUpdates(LocationService.this);
        }
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    public List<LatLng> getPositions()
    {
        if (BuildConfig.DEBUG)
        {
            Log.d(TAG, "getPositions() count: " + this.positions.size());
        }

        return this.positions;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");

        // Setting Dialog Message
        alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });

        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    /**
     * Request location permission, so that we can get the location of the device.
     * The result of the permission request is handled by a callback,
     * onRequestPermissionsResult.
     *
     */
    private void getLocationPermission() {
        if (ContextCompat.checkSelfPermission(mContext,
                android.Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) {
            mLocationPermissionGranted = true;
        }
        else
        {
            mLocationPermissionGranted = false;
        }
    }

    @Override
    public void onLocationChanged(Location location) {
        if (BuildConfig.DEBUG)
        {
            Log.d(TAG, "onLocationChanged(), new location: " + location.toString());
        }

        positions.add(new LatLng(location.getLatitude(), location.getLongitude()));
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }
}