/*
    * Copyright 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.openehealth.ipf.platform.camel.ihe.fhir.core;
  
  import ca.uhn.fhir.context.FhirContext;
  import ca.uhn.fhir.rest.client.api.IGenericClient;
  import ca.uhn.fhir.rest.client.interceptor.BasicAuthInterceptor;
  import ca.uhn.fhir.rest.gclient.IClientExecutable;
  import org.apache.camel.Endpoint;
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.impl.DefaultProducer;
  import org.apache.camel.spi.HeaderFilterStrategy;
  import org.openehealth.ipf.commons.ihe.fhir.ClientRequestFactory;
  import org.openehealth.ipf.commons.ihe.fhir.audit.FhirAuditDataset;
  import org.openehealth.ipf.commons.ihe.fhir.SslAwareApacheRestfulClientFactory;
  import org.openehealth.ipf.commons.ihe.fhir.translation.FhirSecurityInformation;
  import org.openehealth.ipf.platform.camel.core.util.Exchanges;
  
  import java.util.List;
  import java.util.Map;
  
  /**
   * @author Christian Ohr
   * @since 3.1
   */
  public class FhirProducer<AuditDatasetType extends FhirAuditDataset> extends DefaultProducer {
  
      private IGenericClient client;
      private HeaderFilterStrategy headerFilterStrategy;
  
      public FhirProducer(Endpoint endpoint) {
          super(endpoint);
      }
  
      protected synchronized IGenericClient getClient(Exchange exchange) {
          if (client == null) {
              FhirContext context = getEndpoint().getContext();
              SslAwareApacheRestfulClientFactory clientFactory = (SslAwareApacheRestfulClientFactory)context.getRestfulClientFactory();
              FhirEndpointConfiguration<AuditDatasetType> config = getEndpoint().getInterceptableConfiguration();
              FhirSecurityInformation securityInformation = config.getSecurityInformation();
              clientFactory.setSecurityInformation(securityInformation);
  
              // For the producer, the path is supposed to be the server URL
              String path = config.getPath();
  
              path = (config.getSecurityInformation().isSecure() ? "https://" : "http://") + path;
              client = clientFactory.newGenericClient(path);
  
              if (securityInformation != null && securityInformation.getUsername() != null) {
                  client.registerInterceptor(new BasicAuthInterceptor(securityInformation.getUsername(), securityInformation.getPassword()));
              }
  
              // deploy user-defined HAPI interceptors
              List<HapiClientInterceptorFactory> factories = config.getHapiClientInterceptorFactories();
              if (factories != null) {
                  for (HapiClientInterceptorFactory factory : factories) {
                      client.registerInterceptor(factory.newInstance(getEndpoint(), exchange));
                  }
              }
  
          }
          return client;
      }
  
      @Override
      public FhirEndpoint<AuditDatasetType, FhirComponent<AuditDatasetType>> getEndpoint() {
          return (FhirEndpoint<AuditDatasetType, FhirComponent<AuditDatasetType>>)super.getEndpoint();
      }
  
      /**
       * Processes the exchange. Body and Headers are forwarded to
       * {@link ClientRequestFactory#getClientExecutable(IGenericClient, Object, Map)}, so that
       * the actual query can be dynamically constructed from the exchange.
       *
       * @param exchange Camel exchange
       * @throws Exception
       */
      @Override
      public void process(Exchange exchange) {
          ClientRequestFactory<?> requestFactory = getEndpoint().getClientRequestFactory();
          IClientExecutable<?, ?> executableClient = requestFactory.getClientExecutable(
                  getClient(exchange),
                  exchange.getIn().getBody(),
                  exchange.getIn().getHeaders());
         Object result = executableClient.execute();
         Message resultMessage = Exchanges.resultMessage(exchange);
         resultMessage.setBody(result);
     }
 
 
 }