package ca.uhn.fhir.rest.client.interceptor;

/*-
 * #%L
 * HAPI FHIR - Client Framework
 * %%
 * Copyright (C) 2014 - 2021 Smile CDR, Inc.
 * %%
 * 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.
 * #L%
 */

import ca.uhn.fhir.interceptor.api.Hook;
import ca.uhn.fhir.interceptor.api.Interceptor;
import ca.uhn.fhir.interceptor.api.Pointcut;
import ca.uhn.fhir.rest.client.api.IHttpRequest;
import ca.uhn.fhir.rest.client.api.IHttpResponse;
import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;

import java.io.IOException;

/**
 * Client interceptor which simply captures request and response objects and stores them so that they can be inspected after a client
 * call has returned
 *
 * @see ThreadLocalCapturingInterceptor for an interceptor that uses a ThreadLocal in order to work in multithreaded environments
 */
@Interceptor
public class CapturingInterceptor {

	private IHttpRequest myLastRequest;
	private IHttpResponse myLastResponse;

	/**
	 * Clear the last request and response values
	 */
	public void clear() {
		myLastRequest = null;
		myLastResponse = null;
	}

	public IHttpRequest getLastRequest() {
		return myLastRequest;
	}

	public IHttpResponse getLastResponse() {
		return myLastResponse;
	}

	@Hook(value = Pointcut.CLIENT_REQUEST, order = InterceptorOrders.CAPTURING_INTERCEPTOR_REQUEST)
	public void interceptRequest(IHttpRequest theRequest) {
		myLastRequest = theRequest;
	}

	@Hook(value = Pointcut.CLIENT_RESPONSE, order = InterceptorOrders.CAPTURING_INTERCEPTOR_RESPONSE)
	public void interceptResponse(IHttpResponse theResponse) {
		//Buffer the reponse to avoid errors when content has already been read and the entity is not repeatable
		bufferResponse(theResponse);

		myLastResponse = theResponse;
	}

	static void bufferResponse(IHttpResponse theResponse) {
		try {
			if (theResponse.getResponse() instanceof HttpResponse) {
				HttpEntity entity = ((HttpResponse) theResponse.getResponse()).getEntity();
				if (entity != null && !entity.isRepeatable()) {
					theResponse.bufferEntity();
				}
			} else {
				theResponse.bufferEntity();
			}
		} catch (IOException e) {
			throw new InternalErrorException("Unable to buffer the entity for capturing", e);
		}
	}

}
