/*
 * Copyright 2016 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.database;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.sql.SQLException;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import org.traccar.Context;
import org.traccar.helper.Log;
import org.traccar.model.Event;
import org.traccar.model.Notification;
import org.traccar.model.Position;
import org.traccar.notification.NotificationMail;

public class NotificationManager {

    private final DataManager dataManager;

    private final Map<Long, Set<Notification>> userNotifications = new HashMap<>();

    private final ReadWriteLock notificationsLock = new ReentrantReadWriteLock();

    public NotificationManager(DataManager dataManager) {
        this.dataManager = dataManager;
        refresh();
    }

    public void updateEvent(Event event, Position position) {
        try {
            dataManager.addEvent(event);
        } catch (SQLException error) {
            Log.warning(error);
        }

        Set<Long> users = Context.getPermissionsManager().getDeviceUsers(event.getDeviceId());
        for (long userId : users) {
            if (event.getGeofenceId() == 0 || Context.getGeofenceManager() != null
                    && Context.getGeofenceManager().checkGeofence(userId, event.getGeofenceId())) {
                Notification notification = getUserNotificationByType(userId, event.getType());
                if (notification != null) {
                    if (notification.getAttributes().containsKey("web")) {
                        Context.getConnectionManager().updateEvent(userId, event, position);
                    }
                    if (notification.getAttributes().containsKey("mail")) {
                        NotificationMail.sendMailAsync(userId, event, position);
                    }
                }
            }
        }
        if (Context.getEventForwarder() != null) {
            Context.getEventForwarder().forwardEvent(event, position);
        }
    }

    public void updateEvents(Collection<Event> events, Position position) {
        for (Event event : events) {
            updateEvent(event, position);
        }
    }

    private Set<Notification> getUserNotificationsUnsafe(long userId) {
        if (!userNotifications.containsKey(userId)) {
            userNotifications.put(userId, new HashSet<Notification>());
        }
        return userNotifications.get(userId);
    }

    public Set<Notification> getUserNotifications(long userId) {
        notificationsLock.readLock().lock();
        try {
            return getUserNotificationsUnsafe(userId);
        } finally {
            notificationsLock.readLock().unlock();
        }
    }

    public final void refresh() {
        if (dataManager != null) {
            try {
                notificationsLock.writeLock().lock();
                try {
                    userNotifications.clear();
                    for (Notification notification : dataManager.getNotifications()) {
                        getUserNotificationsUnsafe(notification.getUserId()).add(notification);
                    }
                } finally {
                    notificationsLock.writeLock().unlock();
                }
            } catch (SQLException error) {
                Log.warning(error);
            }
        }
    }

    public Notification getUserNotificationByType(long userId, String type) {
        notificationsLock.readLock().lock();
        try {
            for (Notification notification : getUserNotificationsUnsafe(userId)) {
                if (notification.getType().equals(type)) {
                    return notification;
                }
            }
        } finally {
            notificationsLock.readLock().unlock();
        }
        return null;
    }

    public void updateNotification(Notification notification) {
        Notification cachedNotification = getUserNotificationByType(notification.getUserId(), notification.getType());
        if (cachedNotification != null) {
            if (!cachedNotification.getAttributes().equals(notification.getAttributes())) {
                if (notification.getAttributes().isEmpty()) {
                    try {
                        dataManager.removeNotification(cachedNotification);
                    } catch (SQLException error) {
                        Log.warning(error);
                    }
                    notificationsLock.writeLock().lock();
                    try {
                        getUserNotificationsUnsafe(notification.getUserId()).remove(cachedNotification);
                    } finally {
                        notificationsLock.writeLock().unlock();
                    }
                } else {
                    notificationsLock.writeLock().lock();
                    try {
                        cachedNotification.setAttributes(notification.getAttributes());
                    } finally {
                        notificationsLock.writeLock().unlock();
                    }
                    try {
                        dataManager.updateNotification(cachedNotification);
                    } catch (SQLException error) {
                        Log.warning(error);
                    }
                }
            } else {
                notification.setId(cachedNotification.getId());
                notification.setId(cachedNotification.getId());
            }
        } else if (!notification.getAttributes().isEmpty()) {
            try {
                dataManager.addNotification(notification);
            } catch (SQLException error) {
                Log.warning(error);
            }
            notificationsLock.writeLock().lock();
            try {
                getUserNotificationsUnsafe(notification.getUserId()).add(notification);
            } finally {
                notificationsLock.writeLock().unlock();
            }
        }
    }

    public Set<Notification> getAllNotifications() {
        Set<Notification> notifications = new HashSet<>();
        long id = 1;
        Field[] fields = Event.class.getDeclaredFields();
        for (Field field : fields) {
            if (Modifier.isStatic(field.getModifiers()) && field.getName().startsWith("TYPE_")) {
                try {
                    Notification notification = new Notification();
                    notification.setType(field.get(null).toString());
                    notification.setId(id++);
                    notifications.add(notification);
                } catch (IllegalArgumentException | IllegalAccessException error) {
                    Log.warning(error);
                }
            }
        }
        return notifications;
    }

}

@@ -6101,72 +6101,8 @@
 ));%0A
-                notification.setId(cachedNotification.getId());%0A
     

Remove duplicate line