import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class SensorsActivity extends AppCompatActivity implements SensorEventListener {
    private SensorManager sensorManager;
    private Sensor accelerometer;
    private Sensor gyroscopemeter;
    private Sensor magnetometer;
    private Sensor barometer;
    private int speed = SensorManager.SENSOR_DELAY_UI;

    private float[] accelerometerVector = new float[3];
    private float[] magneticVector = new float[3];
    private float[] gyroVector = new float[3];
    private float pressure = 0;

    private int acceleroCountDisplay = 0;
    private int gyroCountDisplay = 0;
    private int magnetoCountDisplay = 0;

    private int acceleroAccuracy = 0;
    private int gyroAccuracy = 0;
    private int magnetoAccuracy = 0;
    private int pressureAccuracy = 0;

    // Text UI
    private TextView currentAccX,
            currentAccY,
            currentAccZ,
            currentRotX,
            currentRotY,
            currentRotZ,
            currentMagX,
            currentMagY,
            currentMagZ,
            currentPressure,
            currentAccuracyAccelero,
            currentAccuracyGyro,
            currentAccuracyMagneto,
            currentAccuracyPressure;

    // Button UI
    private Button btnFinishActivity;

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

        // Init Ui
        initializeUi();

        // Start Sensors
        startSensors();

        // Finish The Activity
        btnFinishActivity.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });
    }

    // Init UI
    private void initializeUi() {
        currentAccX = findViewById(R.id.currentAccX);
        currentAccY = findViewById(R.id.currentAccY);
        currentAccZ = findViewById(R.id.currentAccZ);

        currentRotX = findViewById(R.id.currentRotX);
        currentRotY = findViewById(R.id.currentRotY);
        currentRotZ = findViewById(R.id.currentRotZ);

        currentMagX = findViewById(R.id.currentMagX);
        currentMagY = findViewById(R.id.currentMagY);
        currentMagZ = findViewById(R.id.currentMagZ);

        currentPressure = findViewById(R.id.currentPressure);

        currentAccuracyAccelero = findViewById(R.id.currentAccuracyAccelero);
        currentAccuracyGyro = findViewById(R.id.currentAccuracyGyro);
        currentAccuracyMagneto = findViewById(R.id.currentAccuracyMagneto);
        currentAccuracyPressure = findViewById(R.id.currentAccuracyPressure);

        btnFinishActivity = findViewById(R.id.back_to_previous_activity);
    }

    // Start Sensors
    private void startSensors() {
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

        accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        gyroscopemeter = sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
        magnetometer = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
        barometer = sensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);

        sensorManager.registerListener(this, accelerometer, speed);
        sensorManager.registerListener(this, gyroscopemeter, speed);
        sensorManager.registerListener(this, magnetometer, speed);
        sensorManager.registerListener(this, barometer, speed);
    }

    // Display Value
    private void displayCurrentValues() {
        currentAccX.setText(String.format("%.3f", accelerometerVector[0]));
        currentAccY.setText(String.format("%.3f", accelerometerVector[1]));
        currentAccZ.setText(String.format("%.3f", accelerometerVector[2]));

        currentRotX.setText(String.format("%.3f", gyroVector[0]));
        currentRotY.setText(String.format("%.3f", gyroVector[1]));
        currentRotZ.setText(String.format("%.3f", gyroVector[2]));

        currentMagX.setText(String.format("%.3f", magneticVector[0]));
        currentMagY.setText(String.format("%.3f", magneticVector[1]));
        currentMagZ.setText(String.format("%.3f", magneticVector[2]));

        currentPressure.setText(String.format("%.2f", pressure));

        currentAccuracyAccelero.setText(getAccuracy(acceleroAccuracy));
        currentAccuracyGyro.setText(getAccuracy(gyroAccuracy));
        currentAccuracyMagneto.setText(getAccuracy(magnetoAccuracy));
        currentAccuracyPressure.setText(getAccuracy(pressureAccuracy));
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {}

    @Override
    public void onSensorChanged(SensorEvent event) {
        switch (event.sensor.getType()) {
            case Sensor.TYPE_ACCELEROMETER:
                accelerometerVector[0] = event.values[0];
                accelerometerVector[1] = event.values[1];
                accelerometerVector[2] = event.values[2];
                acceleroAccuracy = event.accuracy;
                acceleroCountDisplay++;
                break;
            case Sensor.TYPE_GYROSCOPE:
                gyroVector[0] = event.values[0];
                gyroVector[1] = event.values[1];
                gyroVector[2] = event.values[2];
                gyroAccuracy = event.accuracy;
                gyroCountDisplay++;
                break;
            case Sensor.TYPE_MAGNETIC_FIELD:
                magneticVector[0] = event.values[0];
                magneticVector[1] = event.values[1];
                magneticVector[2] = event.values[2];
                magnetoAccuracy = event.accuracy;
                magnetoCountDisplay++;
                break;
            case Sensor.TYPE_PRESSURE:
                pressure = event.values[0];
                pressureAccuracy = event.accuracy;
                break;
            default:
                return;
        }
        if (acceleroCountDisplay + gyroCountDisplay + magnetoCountDisplay >= 15) {
            displayCurrentValues();
            acceleroCountDisplay = 0;
            gyroCountDisplay = 0;
            magnetoCountDisplay = 0;
        }
    }

    // Get Sensors Accuracy
    private String getAccuracy(int accuracyValue) {
        switch (accuracyValue) {
            case 0:
                return "UNRELIABLE";
            case 1:
                return "LOW";
            case 2:
                return "MEDIUM";
            case 3:
                return "HIGH";
            case -1:
                return "NO CONTACT";
            default:
                return null;
        }
    }

    // onResume() register the accelerometer for listening the events
    protected void onResume() {
        super.onResume();
        sensorManager.registerListener(this, accelerometer, speed);
        sensorManager.registerListener(this, gyroscopemeter, speed);
        sensorManager.registerListener(this, magnetometer, speed);
        sensorManager.registerListener(this, barometer, speed);
    }

    // onPause() unregister the accelerometer for stop listening the events
    protected void onPause() {
        super.onPause();
        sensorManager.unregisterListener(this);
    }
}