/*
 * Copyright 2018 - 2022 Anton Tananaev (anton@traccar.org)
 * Copyright 2018 Andrey Kunitsyn (andrey@traccar.org)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.traccar.notificators;

import com.google.auth.oauth2.GoogleCredentials;
import com.google.firebase.FirebaseApp;
import com.google.firebase.FirebaseOptions;
import com.google.firebase.messaging.AndroidConfig;
import com.google.firebase.messaging.AndroidNotification;
import com.google.firebase.messaging.FirebaseMessaging;
import com.google.firebase.messaging.FirebaseMessagingException;
import com.google.firebase.messaging.MulticastMessage;
import com.google.firebase.messaging.Notification;
import org.traccar.config.Config;
import org.traccar.config.Keys;
import org.traccar.model.Event;
import org.traccar.model.Position;
import org.traccar.model.User;
import org.traccar.notification.MessageException;
import org.traccar.notification.NotificationFormatter;

import javax.inject.Inject;
import javax.inject.Singleton;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;

@Singleton
public class NotificatorFirebase implements Notificator {

    private final NotificationFormatter notificationFormatter;

    @Inject
    public NotificatorFirebase(Config config, NotificationFormatter notificationFormatter) throws IOException {

        this.notificationFormatter = notificationFormatter;

        InputStream serviceAccount = new ByteArrayInputStream(
                config.getString(Keys.NOTIFICATOR_FIREBASE_SERVICE_ACCOUNT).getBytes());

        FirebaseOptions options = FirebaseOptions.builder()
                .setCredentials(GoogleCredentials.fromStream(serviceAccount))
                .build();

        FirebaseApp.initializeApp(options);
    }

    @Override
    public void send(User user, Event event, Position position) throws MessageException {
        if (user.hasAttribute("notificationTokens")) {

            var shortMessage = notificationFormatter.formatMessage(user, event, position, "short");

            List<String> registrationTokens = Arrays.asList(user.getString("notificationTokens").split("[, ]"));

            MulticastMessage message = MulticastMessage.builder()
                    .setNotification(Notification.builder()
                            .setTitle(shortMessage.getSubject())
                            .setBody(shortMessage.getBody())
                            .build())
                    .setAndroidConfig(AndroidConfig.builder()
                            .setNotification(AndroidNotification.builder()
                                    .setSound("default")
                                    .build())
                            .build())
                    .addAllTokens(registrationTokens)
                    .build();

            try {
                FirebaseMessaging.getInstance().sendMulticast(message);
            } catch (FirebaseMessagingException e) {
                throw new MessageException(e);
            }
        }
    }

}