/*
 * Copyright 2002-2017 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.integration.http.config;

import org.w3c.dom.Element;

import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.integration.config.xml.AbstractConsumerEndpointParser;
import org.springframework.integration.config.xml.IntegrationNamespaceUtils;
import org.springframework.integration.http.outbound.HttpRequestExecutingMessageHandler;
import org.springframework.integration.http.outbound.ReactiveHttpRequestExecutingMessageHandler;
import org.springframework.util.StringUtils;

/**
 * Parser for the 'outbound-gateway' element of the http namespace.
 *
 * @author Mark Fisher
 * @author Oleg Zhurakousky
 * @author Gary Russell
 * @author Artem Bilan
 * @author Shiliang Li
 */
public class HttpOutboundGatewayParser extends AbstractConsumerEndpointParser {

	@Override
	protected String getInputChannelAttributeName() {
		return "request-channel";
	}

	@Override
	protected BeanDefinitionBuilder parseHandler(Element element, ParserContext parserContext) {
		BeanDefinitionBuilder builder;
		boolean reactive = element.getLocalName().contains("reactive");
		if (reactive) {
			builder = BeanDefinitionBuilder.genericBeanDefinition(ReactiveHttpRequestExecutingMessageHandler.class);
		}
		else {
			builder = BeanDefinitionBuilder.genericBeanDefinition(HttpRequestExecutingMessageHandler.class);
		}

		HttpAdapterParsingUtils.configureUrlConstructorArg(element, parserContext, builder);
		IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, "encode-uri");
		HttpAdapterParsingUtils.setHttpMethodOrExpression(element, parserContext, builder);

		if (reactive) {
			String webClientRef = element.getAttribute("web-client");
			if (StringUtils.hasText(webClientRef)) {
				builder.addConstructorArgReference(webClientRef);
			}
		}
		else {
			String restTemplateRef = element.getAttribute("rest-template");

			if (StringUtils.hasText(restTemplateRef)) {
				HttpAdapterParsingUtils.verifyNoRestTemplateAttributes(element, parserContext);
				builder.addConstructorArgReference(restTemplateRef);
			}
			else {
				for (String referenceAttributeName : HttpAdapterParsingUtils.SYNC_REST_TEMPLATE_REFERENCE_ATTRIBUTES) {
					IntegrationNamespaceUtils.setReferenceIfAttributeDefined(builder, element, referenceAttributeName);
				}
			}
		}

		String headerMapper = element.getAttribute("header-mapper");
		String mappedRequestHeaders = element.getAttribute("mapped-request-headers");
		String mappedResponseHeaders = element.getAttribute("mapped-response-headers");
		if (StringUtils.hasText(headerMapper)) {
			if (StringUtils.hasText(mappedRequestHeaders) || StringUtils.hasText(mappedResponseHeaders)) {
				parserContext.getReaderContext()
						.error("Neither 'mapped-request-headers' or 'mapped-response-headers' " +
										"attributes are allowed when a 'header-mapper' has been specified.",
								parserContext.extractSource(element));
				return null;
			}
			builder.addPropertyReference("headerMapper", headerMapper);
		}
		else {
			BeanDefinitionBuilder headerMapperBuilder = BeanDefinitionBuilder.genericBeanDefinition(
					"org.springframework.integration.http.support.DefaultHttpHeaderMapper");
			headerMapperBuilder.setFactoryMethod("outboundMapper");
			IntegrationNamespaceUtils.setValueIfAttributeDefined(headerMapperBuilder, element,
					"mapped-request-headers", "outboundHeaderNames");
			IntegrationNamespaceUtils.setValueIfAttributeDefined(headerMapperBuilder, element,
					"mapped-response-headers", "inboundHeaderNames");
			builder.addPropertyValue("headerMapper", headerMapperBuilder.getBeanDefinition());
		}
		IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, "charset");
		IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, "extract-request-payload",
				"extractPayload");

		HttpAdapterParsingUtils.setExpectedResponseOrExpression(element, parserContext, builder);

		IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, "reply-timeout", "sendTimeout");
		IntegrationNamespaceUtils.setReferenceIfAttributeDefined(builder, element, "reply-channel", "outputChannel");
		HttpAdapterParsingUtils.configureUriVariableExpressions(builder, parserContext, element);
		IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, "transfer-cookies");
		return builder;
	}

}