/*
 * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.sufficientlysecure.keychain.ui;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.support.v4.content.ContextCompat;
import android.view.KeyEvent;

import com.journeyapps.barcodescanner.CaptureManager;
import com.journeyapps.barcodescanner.CompoundBarcodeView;

import org.sufficientlysecure.keychain.R;

public class QrCodeCaptureActivity extends FragmentActivity {
    private CaptureManager capture;
    private CompoundBarcodeView barcodeScannerView;

    public static final int MY_PERMISSIONS_REQUEST_CAMERA = 42;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.qr_code_capture_activity);

        barcodeScannerView = (CompoundBarcodeView) findViewById(R.id.zxing_barcode_scanner);
        barcodeScannerView.setStatusText(getString(R.string.import_qr_code_text));

        if (savedInstanceState != null) {
            init(barcodeScannerView, getIntent(), savedInstanceState);
        }

        // check Android 6 permission
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                == PackageManager.PERMISSION_GRANTED) {
            init(barcodeScannerView, getIntent(), null);
        } else {
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.CAMERA},
                    MY_PERMISSIONS_REQUEST_CAMERA);
        }
    }

    private void init(CompoundBarcodeView barcodeScannerView, Intent intent, Bundle savedInstanceState) {
        capture = new CaptureManager(this, barcodeScannerView);
        capture.initializeFromIntent(intent, savedInstanceState);
        capture.decode();
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[],
                                           @NonNull int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_CAMERA: {
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // permission was granted
                    init(barcodeScannerView, getIntent(), null);
                } else {
                    setResult(Activity.RESULT_CANCELED);
                    finish();
                }
            }
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (capture != null) {
            capture.onResume();
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (capture != null) {
            capture.onPause();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (capture != null) {
            capture.onDestroy();
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (capture != null) {
            capture.onSaveInstanceState(outState);
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        return barcodeScannerView.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);
    }
}