/**
 * Copyright 2016-present Open Networking Laboratory
 * 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.onosproject.kafkaintegration.rest;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.UUID;

import org.onosproject.codec.CodecContext;
import org.onosproject.codec.JsonCodec;
import org.onosproject.kafkaintegration.api.dto.EventSubscriber;
import org.onosproject.kafkaintegration.api.dto.EventSubscriberGroupId;
import org.onosproject.kafkaintegration.api.dto.OnosEvent.Type;

import com.fasterxml.jackson.databind.node.ObjectNode;

/**
 * Codec for encoding/decoding a Subscriber object to/from JSON.
 *
 */
public final class SubscriberCodec extends JsonCodec<EventSubscriber> {

    // JSON field names
    private static final String NAME = "appName";
    private static final String GROUP_ID = "groupId";
    private static final String EVENT_TYPE = "eventType";

    @Override
    public ObjectNode encode(EventSubscriber data, CodecContext context) {
        checkNotNull(data, "Subscriber cannot be null");
        return context.mapper().createObjectNode().put(NAME, data.appName())
                .put(GROUP_ID, data.subscriberGroupId().getId().toString())
                .put(EVENT_TYPE, data.eventType().toString());
    }

    @Override
    public EventSubscriber decode(ObjectNode json, CodecContext context) {
        String name = json.path(NAME).asText();
        String groupId = json.path(GROUP_ID).asText();
        EventSubscriberGroupId subscriberGroupId = new EventSubscriberGroupId(UUID
                .fromString(groupId));
        String eventType = json.path(EVENT_TYPE).asText();

        return new EventSubscriber(name, subscriberGroupId,
                                   Type.valueOf(eventType));
    }
}