package de.dim.diamant;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.MenuItem;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import me.dm7.barcodescanner.zxing.ZXingScannerView;

import static android.Manifest.permission.CAMERA;

public abstract class ScanActivity extends AppCompatActivity implements ZXingScannerView.ResultHandler {

    private static final int REQUEST_CAMERA = 1;
    protected ZXingScannerView scannerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        scannerView = new ZXingScannerView(this);
        setContentView(scannerView);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        // check if permissions are granted, else request permissions
        if (checkPermission()) {
            Toast.makeText(this, "Berechtigungen vorhanden!", Toast.LENGTH_LONG).show();
        } else {
            requestPermission();
        }

    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        int id = item.getItemId();

        if (id == android.R.id.home) {
            scannerView.stopCamera();
            scannerView.stopCameraPreview();
            // These following two line keep the intent state with the product in the extras
            finish();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    protected void onResume() {
        super.onResume();

        if (checkPermission()) {
            if (scannerView == null) {
                scannerView = new ZXingScannerView(this);
                setContentView(scannerView);
            }
            scannerView.setResultHandler(ScanActivity.this);
            scannerView.startCamera();
        } else {
            requestPermission();
        }

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        scannerView.stopCamera();
    }


    private boolean checkPermission() {
        return ContextCompat.checkSelfPermission(ScanActivity.this, CAMERA)
                == PackageManager.PERMISSION_GRANTED;

    }


    private void requestPermission() {
        ActivityCompat.requestPermissions(this, new String[]{CAMERA}, REQUEST_CAMERA);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case REQUEST_CAMERA:
                if (grantResults.length > 0) {
                    boolean cameraAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;

                    if (cameraAccepted) {
                        Toast.makeText(ScanActivity.this, "Berechtigung erteilt!", Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(ScanActivity.this, "Berechtigungen nicht vorhanden!", Toast.LENGTH_SHORT).show();

                        if(shouldShowRequestPermissionRationale(CAMERA)) {
                            displayAlertMessage("Es müssen beide Berechtigungen erteilt werden!",
                                    new DialogInterface.OnClickListener() {
                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                            requestPermissions(new String[]{CAMERA}, REQUEST_CAMERA);
                                        }
                                    });
                            return;
                        }
                    }
                }
                break;
        }

    }

    public void displayAlertMessage(String message, DialogInterface.OnClickListener listener) {
        new AlertDialog.Builder(ScanActivity.this)
                .setMessage(message)
                .setPositiveButton("OK", listener)
                .setNegativeButton("Cancel", null)
                .create()
                .show();
    }

}