package com.example.pace;

import android.app.Activity;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

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

import java.math.BigDecimal;

public class MainActivity extends Activity implements GPSCallback {
    private GPSManager gpsManager = null;
    private double speed = 0.0;
    Boolean isGPSEnabled=false;
    LocationManager locationManager;
    double currentSpeed,kmphSpeed, mileSpeed;
    TextView txtview;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txtview=(TextView)findViewById(R.id.info);
        try {
            if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED ) {
                ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 101);
            }
        } catch (Exception e){
            e.printStackTrace();
        }
        getCurrentSpeed(txtview);
    }

    public void getCurrentSpeed(View view){
        txtview.setText(getString(R.string.info));
        locationManager = (LocationManager)getSystemService(LOCATION_SERVICE);
        gpsManager = new GPSManager(MainActivity.this);
        isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
        if(isGPSEnabled) {
            gpsManager.startListening(getApplicationContext());
            gpsManager.setGPSCallback(this);
        } else {
            gpsManager.showSettingsAlert();
        }
    }

    @Override
    public void onGPSUpdate(Location location) {
        speed = location.getSpeed();
        currentSpeed = round(speed,3,BigDecimal.ROUND_HALF_UP);
        kmphSpeed = round((currentSpeed*3.6),3, BigDecimal.ROUND_HALF_UP);
        mileSpeed = kmphSpeed/1.609344;
        String s = Double.toString(mileSpeed);
        double d = Double.parseDouble(s.charAt(0) + "." + s.charAt(s.indexOf('.') + 1));
        txtview.setText(d+ "");
    }

    @Override
    protected void onDestroy() {
        gpsManager.stopListening();
        gpsManager.setGPSCallback(null);
        gpsManager = null;
        super.onDestroy();
    }

    public static double round(double unrounded, int precision, int roundingMode) {
        BigDecimal bd = new BigDecimal(unrounded);
        BigDecimal rounded = bd.setScale(precision, roundingMode);
        return rounded.doubleValue();
    }
}