/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.rocketmq.eventbridge.adapter.api.converter;

import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import io.cloudevents.CloudEvent;
import io.cloudevents.core.format.EventFormat;
import io.cloudevents.core.provider.EventFormatProvider;
import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Service;

import static org.apache.http.protocol.HTTP.CONTENT_TYPE;

@Service
public class CloudEventStructuredConverter implements EventConverter {

    private static final String HTTP_STRUCTURED_PROTOCOL_BINDING = "application/cloudevents+json";

    @Override
    public boolean hit(Map<String, String> headers) {
        String contentType = headers.get(CONTENT_TYPE);
        return !Strings.isNullOrEmpty(contentType) && contentType.startsWith(HTTP_STRUCTURED_PROTOCOL_BINDING);
    }

    @Override
    public List<CloudEvent> toEventBridgeEvent(Map<String, String> headers, byte[] body) {
        EventFormat format = EventFormatProvider.getInstance()
            .resolveFormat(HTTP_STRUCTURED_PROTOCOL_BINDING);
        CloudEvent event = format.deserialize(body);
        return Lists.newArrayList(event);
    }
}

