/**
    * Copyright 2013 The Kuali Foundation Licensed under the
    * Educational Community 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.osedu.org/licenses/ECL-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.
   *
   * Created by bobhurt on 5/1/13
   */
  package org.kuali.rice.krad.web.controller;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.uif.UifParameters;
  import org.kuali.rice.krad.uif.field.AttributeQueryResult;
  import org.kuali.rice.krad.web.form.UifFormBase;
  import org.springframework.validation.BindingResult;
  import org.springframework.web.bind.annotation.ModelAttribute;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestMethod;
  import org.springframework.web.bind.annotation.ResponseBody;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * This class overrides one or more methods from Rice's UifControllerBase class
   *
   * @author Kuali Student Team
   */
  public abstract class KsUifControllerBase extends UifControllerBase {
  
  
      /**
       * Invoked to provide the options for a suggest widget. The valid options are retrieved by the associated
       * <code>AttributeQuery</code> for the field containing the suggest widget. The controller method picks
       * out the query parameters from the request and calls <code>AttributeQueryService</code> to perform the
       * suggest query and prepare the result object that will be exposed with JSON
       */
      @Override
      @RequestMapping(method = RequestMethod.GET, params = "methodToCall=performFieldSuggest")
      public
      @ResponseBody
      AttributeQueryResult performFieldSuggest(@ModelAttribute("KualiForm") UifFormBase form, BindingResult result,
                                               HttpServletRequest request, HttpServletResponse response) {
  
          // retrieve query fields from request
          Map<String, String> queryParameters = new HashMap<String, String>();
          for (Object parameterName : request.getParameterMap().keySet()) {
              if (parameterName.toString().startsWith(UifParameters.QUERY_PARAMETER + ".")) {
                  String fieldName = StringUtils.substringAfter(parameterName.toString(),
                          UifParameters.QUERY_PARAMETER + ".");
                  String fieldValue = request.getParameter(parameterName.toString());
                  queryParameters.put(fieldName, fieldValue);
              }
          }
  
          // retrieve id for field to perform query for
          String queryFieldId = request.getParameter(UifParameters.QUERY_FIELD_ID);
          if (StringUtils.isBlank(queryFieldId)) {
              throw new RuntimeException("Unable to find id for field to perform query on under request parameter name: "
                      + UifParameters.QUERY_FIELD_ID);
          }
  
          // get the field term to match
          String queryTerm = request.getParameter(UifParameters.QUERY_TERM);
          Boolean isBlankQueryTermAllowed =
                  "true".equalsIgnoreCase(request.getParameter("blankQueryTermAllowed"));
          if ( ! isBlankQueryTermAllowed) {
              if (StringUtils.isBlank(queryTerm)) {
                  throw new RuntimeException(
                          "Unable to find id for query term value for attribute query on under request parameter name: "
                                  + UifParameters.QUERY_TERM);
              }
          }
  
          // invoke attribute query service to perform the query
          AttributeQueryResult queryResult = KRADServiceLocatorWeb.getAttributeQueryService().performFieldSuggestQuery(
                  form.getViewPostMetadata(), queryFieldId, queryTerm, queryParameters);
  
          return queryResult;
      }
  
  }