mMDT5_PR_MSY1_Gruppe1/app/src/main/java/de/edotzlaff/schockwelle/EarthquakeMapsActivity.java

package de.edotzlaff.schockwelle;

import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.os.SystemClock;
import android.util.Log;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.FragmentActivity;

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

public class EarthquakeMapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private static final String TAG = "MainActivity";
    private static final String FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
    private static final int LOCATION_PERMISSION_REQUEST_CODE = 1234;

    //vars
    private Boolean mLocationPermissionsGranted = false;
    private GoogleMap mMap;
    private FusedLocationProviderClient mFusedLocationProviderClient;

    private DatabaseReference mDatenbank;

    private double breitengrad;
    private double laengengrad;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_earthquake_maps);

        getDataBaseValues();    //TODO Edward: Nur als Anmerkung, diese Methode erfolgt damit deine Methode getDeviceLocation Koordinaten aus der DB bekommt
        getLocationPermission();
    }

    private void getLocationPermission() {
        String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION};
        if (ContextCompat.checkSelfPermission(this.getApplicationContext(), FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            mLocationPermissionsGranted = true;
            initMap();
        } else {
            ActivityCompat.requestPermissions(this, permissions, LOCATION_PERMISSION_REQUEST_CODE);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        mLocationPermissionsGranted = false;

        switch (requestCode) {
            case LOCATION_PERMISSION_REQUEST_CODE: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    mLocationPermissionsGranted = true;
                    //initalize or map
                    initMap();
                }
            }
        }
    }


    private void initMap() {
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        Toast.makeText(this, "Map is ready", Toast.LENGTH_SHORT).show();
        mMap = googleMap;

        if (mLocationPermissionsGranted) {
            getDeviceLocation();

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

                return;
            }
            mMap.setMyLocationEnabled(true);
        }

        // Add a marker in Sydney and move the camera
        //LatLng sydney = new LatLng(-34, 151);
        //mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        //mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }

    private void getDeviceLocation(){
        mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
        try {
            if (mLocationPermissionsGranted){
                final Task location = mFusedLocationProviderClient.getLastLocation();

                location.addOnCompleteListener(new OnCompleteListener() {

                    @Override
                    public void onComplete(@NonNull Task task) {
                        if (task.isSuccessful()){
                            Location currentLocation = (Location) task.getResult();
                            currentLocation.setLatitude(breitengrad);                   //TODO Edward: Hier werden beispielweise Koordinaten aus der Datenbank verwendet für Gerät IDG1
                            currentLocation.setLongitude(laengengrad);
                            moveCamera(new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude()),15f);
                        }
                        else{
                            Toast.makeText(EarthquakeMapsActivity.this, "Current Location unavailable", Toast.LENGTH_SHORT).show();
                        }
                    }
                });
            }
        }catch (SecurityException e){
            Log.e(TAG,"Device Location not found" + e.getMessage());
        }
    }

    private void moveCamera(LatLng latlng, float zoom){
        Log.d(TAG,"Latitude: "+latlng.latitude+"Longitude: "+latlng.longitude);
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latlng, zoom));
    }

    public void getDataBaseValues()
    {
        mDatenbank = FirebaseDatabase.getInstance().getReference();
        mDatenbank.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot snapshot) {
                processDataBaseValues(snapshot);                           //Daten Snapshot, Übergabe an processDataBaseValues
            }
            @Override
            public void onCancelled(@NonNull DatabaseError error) {
                getDataBaseFailure(error);
            }
        });
    }

    public void processDataBaseValues (DataSnapshot data)
    {
        //####### Hier wird beispielweise mit IDG1 gearbeitet, sollte aber klüger ausgearbeitet werden #######:
        String breitengradString = data.child("overview").child("IDG1").child("breitengrad").getValue().toString();     //TODO Aron/Team: Idee für passende ID je nach zugreifendem Gerät ==> Hardcoded oder flexibel?
        String laengengradString = data.child("overview").child("IDG1").child("laengengrad").getValue().toString();
        breitengrad = Double.parseDouble(breitengradString);
        laengengrad = Double.parseDouble(laengengradString);
    }

    public void getDataBaseFailure (DatabaseError error)
    {
        System.out.println("Fehler");
        Log.w("Datenbankfehler", error.toException());
    }


    //TODO Edward: Hier ist eine beispielhafte Methode mit der du Werte in der Datenbank setzen kannst
    public void setDataBaseValues()
    {
        mDatenbank = FirebaseDatabase.getInstance().getReference();
        mDatenbank.child("overview").child("IDG1").child("ip").setValue("10.00.00.001");
        mDatenbank.child("overview").child("IDG1").child("vibration").setValue(true);
        mDatenbank.child("overview").child("IDG1").child("timestamp").setValue(1113456789);
        mDatenbank.child("overview").child("IDG1").child("breitengrad").setValue(49.5);
        mDatenbank.child("overview").child("IDG1").child("laengengrad").setValue(11.5);
        mDatenbank.child("overview").child("IDG1").child("amplitude").setValue(1001);
    }
}