/*
 * Copyright 2017 - 2019 Anton Tananaev (anton@traccar.org)
 * Copyright 2017 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.handler.events;

import java.util.Collections;
import java.util.Map;

import io.netty.channel.ChannelHandler;
import org.traccar.database.IdentityManager;
import org.traccar.model.Event;
import org.traccar.model.Position;

@ChannelHandler.Sharable
public class DriverEventHandler extends BaseEventHandler {

    private final IdentityManager identityManager;

    public DriverEventHandler(IdentityManager identityManager) {
        this.identityManager = identityManager;
    }

    @Override
    protected Map<Event, Position> analyzePosition(Position position) {
        if (!identityManager.isLatestPosition(position)) {
            return null;
        }
        String driverUniqueId = position.getString(Position.KEY_DRIVER_UNIQUE_ID);
        if (driverUniqueId != null) {
            String oldDriverUniqueId = null;
            Position lastPosition = identityManager.getLastPosition(position.getDeviceId());
            if (lastPosition != null) {
                oldDriverUniqueId = lastPosition.getString(Position.KEY_DRIVER_UNIQUE_ID);
            }
            if (!driverUniqueId.equals(oldDriverUniqueId)) {
                Event event = new Event(Event.TYPE_DRIVER_CHANGED, position.getDeviceId(), position.getId());
                event.set(Position.KEY_DRIVER_UNIQUE_ID, driverUniqueId);
                return Collections.singletonMap(event, position);
            }
        }
        return null;
    }

}