/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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.apache.jetspeed.ajax;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import javax.servlet.ServletContext;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /***
   * Request used for AJAX services.
   * 
   * @author <href a="mailto:weaver@apache.org">Scott T. Weaver</a>
   *
   */
  public class AJAXRequestImpl implements AJAXRequest
  {
      public static final String AJAX_SERVICE = "ajax_service";
      public static final String AJAX_PARAM_PREFIX = "ajax_param_";
      
      private final HttpServletRequest request;
      private List ajaxParams;
      private final String serviceName;
      private final String methodName;
      private HttpServletResponse response;
      private ServletContext context;
  
      public AJAXRequestImpl(HttpServletRequest request, HttpServletResponse response, ServletContext context) throws AJAXException
      {
          this.request = request;
          this.response = response;
          this.context = context;
          String serviceRequest =  request.getParameter(AJAX_SERVICE);
          if(serviceRequest == null )
          {
              throw new AJAXException("No '"+AJAX_SERVICE+"' parameter could be found in the request or it was not in the '{service_name}.{method_name}' format.");
          }
          final String split = serviceRequest.split("//.")[0];
          serviceName = split;
          methodName = serviceRequest.split("//.")[1];
          
          parseRequestArguments();
          
      }
      
      /* (non-Javadoc)
       * @see org.apache.jetspeed.ajax.AJAXRequest#getParameters()
       */
      public List getParameters()
      {
          return ajaxParams;
      }
  
      /* (non-Javadoc)
       * @see org.apache.jetspeed.ajax.AJAXRequest#getServiceName()
       */
      public String getServiceName()
      {
          return serviceName;
      }
  
      protected List parseRequestArguments() throws AJAXException
      {
          try
          {
              ajaxParams = new ArrayList();
              Map rawParams = request.getParameterMap();
              Iterator entryItr = rawParams.entrySet().iterator();
              while(entryItr.hasNext())
              {
                  Map.Entry entry = (Map.Entry) entryItr.next();
                  String key = entry.getKey().toString();
                  
                  if(key.startsWith(AJAX_PARAM_PREFIX))
                  {
                      String[] paramInfo = key.split("_");
                      int index = Integer.parseInt(paramInfo[2]);
                      String type = paramInfo[3]; 
                      AJAXParameter ajaxParam = new AJAXParameter(type, (String[])entry.getValue());
                      ajaxParams.add(index, ajaxParam);
                  }
             }
             return ajaxParams;
         }
         catch (Throwable e)
         {
             throw new AJAXException("Errors were encountered parsing request parameters for the AJAX service "+serviceName+": "+e.getMessage(), e);
         }
     }
     
     public class AJAXParameter
     {
         private Object value;
              
         public AJAXParameter(String typeName, String[] paramValues)
         {
             if(typeName.equals("int"))
             {                
                 if(paramValues.length > 1)
                 {
                     int[] intValues = new int[paramValues.length];
                     for(int i=0; i<paramValues.length; i++)
                     {
                         intValues[i] = Integer.parseInt(paramValues[i]);
                     }
                 }
                 else
                 {
                     value = new Integer(paramValues[0]);
                 }
             }
             else if(typeName.equals("str"))
             {
               if(paramValues.length > 1)
               {    
                   value = paramValues;
               }
               else
               {
                   value = paramValues[0];
               }
             }
         }
         
         public Object getValue()
         {
             return value;
         }
     }
 
 
     /* (non-Javadoc)
      * @see org.apache.jetspeed.ajax.AJAXRequest#getMethodName()
      */
     public String getMethodName()
     {
         return methodName;
     }
 
     /* (non-Javadoc)
      * @see org.apache.jetspeed.ajax.AJAXRequest#getContext()
      */
     public ServletContext getContext()
     {
         return context;
     }
 
     /* (non-Javadoc)
      * @see org.apache.jetspeed.ajax.AJAXRequest#getServletRequest()
      */
     public HttpServletRequest getServletRequest()
     {
         return request;
     }
 
     /* (non-Javadoc)
      * @see org.apache.jetspeed.ajax.AJAXRequest#getServletResponse()
      */
     public HttpServletResponse getServletResponse()
     {
         return response;
     }
 }