/*
 *  Copyright 2013-2016 the original author or authors.
 *
 *  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.springframework.cloud.contract.stubrunner.messaging.camel;

import org.springframework.cloud.contract.verifier.util.BodyExtractor;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.Processor;
import org.springframework.cloud.contract.spec.Contract;
import org.springframework.cloud.contract.spec.internal.Header;

/**
 * Sends forward a message defined in the DSL. Also removes headers from the input message
 * and provides the headers from the DSL.
 *
 * @author Marcin Grzejszczak
 */
class StubRunnerCamelProcessor implements Processor {

	private final Contract groovyDsl;

	StubRunnerCamelProcessor(Contract groovyDsl) {
		this.groovyDsl = groovyDsl;
	}

	@Override
	public void process(Exchange exchange) throws Exception {
		Message input = exchange.getIn();
		if (groovyDsl.getInput().getMessageHeaders() != null) {
			for (Header entry : groovyDsl.getInput().getMessageHeaders().getEntries()) {
				input.removeHeader(entry.getName());
			}
		}
		if (groovyDsl.getOutputMessage() == null) {
			return;
		}
		input.setBody(BodyExtractor
				.extractStubValueFrom(groovyDsl.getOutputMessage().getBody()));
		if (groovyDsl.getOutputMessage().getHeaders() != null) {
			for (Header entry : groovyDsl.getOutputMessage().getHeaders().getEntries()) {
				input.setHeader(entry.getName(), entry.getClientValue());
			}
		}
	}
}
