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/*
 * Copyright 2020 - 2023 Anton Tananaev (anton@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.fasterxml.jackson.annotation.JsonProperty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.NotificationFormatter;
import org.traccar.session.cache.CacheManager;
import org.traccar.storage.Storage;
import org.traccar.storage.StorageException;
import org.traccar.storage.query.Columns;
import org.traccar.storage.query.Condition;
import org.traccar.storage.query.Request;

import jakarta.inject.Inject;
import jakarta.inject.Singleton;
import jakarta.json.JsonObject;
import jakarta.ws.rs.client.Client;
import jakarta.ws.rs.client.Entity;
import jakarta.ws.rs.core.Response;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

@Singleton
public class NotificatorTraccar implements Notificator {

    private static final Logger LOGGER = LoggerFactory.getLogger(NotificatorTraccar.class);

    private final NotificationFormatter notificationFormatter;
    private final Client client;
    private final Storage storage;
    private final CacheManager cacheManager;

    private final String url;
    private final String key;

    public static class NotificationObject {
        @JsonProperty("title")
        private String title;
        @JsonProperty("body")
        private String body;
        @JsonProperty("sound")
        private String sound;
    }

    public static class Message {
        @JsonProperty("registration_ids")
        private String[] tokens;
        @JsonProperty("notification")
        private NotificationObject notification;
    }

    @Inject
    public NotificatorTraccar(
            Config config, NotificationFormatter notificationFormatter, Client client,
            Storage storage, CacheManager cacheManager) {
        this.notificationFormatter = notificationFormatter;
        this.client = client;
        this.storage = storage;
        this.cacheManager = cacheManager;
        this.url = "https://www.traccar.org/push/";
        this.key = config.getString(Keys.NOTIFICATOR_TRACCAR_KEY);
    }

    @Override
    public void send(org.traccar.model.Notification notification, User user, Event event, Position position) {
        if (user.hasAttribute("notificationTokens")) {

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

            NotificationObject item = new NotificationObject();
            item.title = shortMessage.getSubject();
            item.body = shortMessage.getBody();
            item.sound = "default";

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

            Message message = new Message();
            message.tokens = user.getString("notificationTokens").split("[, ]");
            message.notification = item;

            var request = client.target(url).request().header("Authorization", "key=" + key);
            try (Response result = request.post(Entity.json(message))) {
                var json = result.readEntity(JsonObject.class);
                List<String> failedTokens = new LinkedList<>();
                var responses = json.getJsonArray("responses");
                for (int i = 0; i < responses.size(); i++) {
                    var response = responses.getJsonObject(i);
                    if (!response.getBoolean("success")) {
                        var error = response.getJsonObject("error");
                        String errorCode = error.getString("code");
                        if (errorCode.equals("messaging/invalid-argument")
                                || errorCode.equals("messaging/registration-token-not-registered")) {
                            failedTokens.add(registrationTokens.get(i));
                        }
                        LOGGER.warn("Push user {} error - {}", user.getId(), error.getString("message"));
                    }
                }
                if (!failedTokens.isEmpty()) {
                    registrationTokens.removeAll(failedTokens);
                    if (registrationTokens.isEmpty()) {
                        user.getAttributes().remove("notificationTokens");
                    } else {
                        user.set("notificationTokens", String.join(",", registrationTokens));
                    }
                    storage.updateObject(user, new Request(
                            new Columns.Include("attributes"),
                            new Condition.Equals("id", user.getId())));
                    cacheManager.updateOrInvalidate(true, user);
                }
            } catch (StorageException e) {
                LOGGER.warn("Push error", e);
            }
        }
    }

}