/*
    * Copyright 2015 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.commons.ihe.fhir.iti83;
  
  import ca.uhn.fhir.rest.annotation.IdParam;
  import ca.uhn.fhir.rest.annotation.Operation;
  import ca.uhn.fhir.rest.annotation.OperationParam;
  import ca.uhn.fhir.rest.param.TokenParam;
  import ca.uhn.fhir.rest.param.UriParam;
  import ca.uhn.fhir.rest.server.exceptions.InvalidRequestException;
  import org.hl7.fhir.dstu3.model.IdType;
  import org.hl7.fhir.dstu3.model.Identifier;
  import org.hl7.fhir.dstu3.model.Parameters;
  import org.hl7.fhir.dstu3.model.Patient;
  import org.hl7.fhir.dstu3.model.UriType;
  import org.openehealth.ipf.commons.ihe.fhir.AbstractPlainProvider;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import static org.openehealth.ipf.commons.ihe.fhir.Constants.SOURCE_IDENTIFIER_NAME;
  import static org.openehealth.ipf.commons.ihe.fhir.Constants.TARGET_SYSTEM_NAME;
  
  /**
   * According to the PIXM specification, this resource provider must handle requests in the form
   * GET [base]/Patient/$ihe-pix?sourceIdentifier=[token]]{&targetSystem=[uri]}{&_format=[mime-type]}
   *
   * @author Christian Ohr
   * @since 3.4
   */
  public class Iti83ResourceProvider extends AbstractPlainProvider {
  
      /**
       * Handles the PIXm Query
       *
       * @param sourceIdentifierParam Identifier to search for. Should be an {@link Identifier}, but obviously
       *                              non-primitive types are forbidden in GET operations
       * @param targetSystemParam     target system URI
       * @return {@link Parameters} containing found identifiers
       */
      @SuppressWarnings("unused")
      @Operation(name = Iti83Constants.PIXM_OPERATION_NAME, type = Patient.class, idempotent = true, returnParameters = {@OperationParam(name = "return", type = Identifier.class, max = 100)})
      public Parameters pixmQuery(
              @OperationParam(name = SOURCE_IDENTIFIER_NAME) TokenParam sourceIdentifierParam,
              @OperationParam(name = TARGET_SYSTEM_NAME) UriParam targetSystemParam,
              HttpServletRequest httpServletRequest,
              HttpServletResponse httpServletResponse) {
  
          Identifier sourceIdentifier = new Identifier()
                  .setSystem(sourceIdentifierParam.getSystem())
                  .setValue(sourceIdentifierParam.getValue());
          UriType targetUri = targetSystemParam == null ? null : new UriType(targetSystemParam.getValue());
  
          Parameters inParams = new Parameters();
          inParams.addParameter().setName(SOURCE_IDENTIFIER_NAME).setValue(sourceIdentifier);
          inParams.addParameter().setName(TARGET_SYSTEM_NAME).setValue(targetUri);
  
          // Run down the route
          return requestResource(inParams, Parameters.class, httpServletRequest, httpServletResponse);
      }
  
      /**
       * Handles the PIXm Retrieve. Note that this is not part of the specification, but a useful variant that allows to use resource IDs
       * in requests such as .../Patient/4711/$ihe-pix would be equivalent with .../Patient/$ihe-pix?sourceIdentifier=URI|4711 where URI
       * identifies the NamingSystem used for resource IDs
       *
       * @param resourceId          resource ID
       * @param targetSystemParam   target system URI
       * @param httpServletRequest  servlet request
       * @param httpServletResponse servlet response
       * @return {@link Parameters} containing found identifiers
       */
      @Operation(name = Iti83Constants.PIXM_OPERATION_NAME, type = Patient.class, idempotent = true, returnParameters = {@OperationParam(name = "return", type = Identifier.class, max = 100)})
      public Parameters pixmRetrieve(
              @IdParam IdType resourceId,
              @OperationParam(name = TARGET_SYSTEM_NAME) UriParam targetSystemParam,
              HttpServletRequest httpServletRequest,
              HttpServletResponse httpServletResponse) {
          if (resourceId == null) throw new InvalidRequestException("Must provide ID with READ request");
          UriType targetUri = targetSystemParam == null ? null : new UriType(targetSystemParam.getValue());
  
          Parameters inParams = new Parameters();
          inParams.addParameter().setName(SOURCE_IDENTIFIER_NAME).setValue(new Identifier().setValue(resourceId.getIdPart()));
          inParams.addParameter().setName(TARGET_SYSTEM_NAME).setValue(targetUri);
  
         // Run down the route
         return requestResource(inParams, Parameters.class, httpServletRequest, httpServletResponse);
     }
 }