/**
    * This file Copyright (c) 2003-2018 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.cms.util;
  
  import info.magnolia.cms.beans.runtime.Document;
  import info.magnolia.cms.beans.runtime.MultipartForm;
  import info.magnolia.context.MgnlContext;
  
  import java.io.UnsupportedEncodingException;
  import java.net.URLDecoder;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.servlet.http.HttpServletRequest;
  
  import org.apache.commons.lang3.StringUtils;
  
  
  /**
   * Sometimes one get the parameters via form (multipart-post) and via request (get, normal post). Using this Util you
   * have not to care.
   *
   * @deprecated since 4.0 - should not be needed anymore since MAGNOLIA-2449 - request parameters should be correctly wrapped. To access uploaded documents, use {@link info.magnolia.cms.beans.runtime.MultipartForm}.
   */
  public class RequestFormUtil {
  
      private MultipartForm form;
  
      private HttpServletRequest request;
  
      public RequestFormUtil(HttpServletRequest request) {
          this(request, MgnlContext.getPostedForm());
      }
  
      public RequestFormUtil(HttpServletRequest request, MultipartForm form) {
          super();
          this.form = form;
          this.request = request;
      }
  
      public String getParameter(String name) {
          return getParameter(this.request, this.form, name);
      }
  
      public static String getParameter(HttpServletRequest request, String name) {
          return getParameter(request, MgnlContext.getPostedForm(), name);
      }
  
      /**
       * Returns the value found in the form or the request.
       */
      public static String getParameter(HttpServletRequest request, MultipartForm from, String name) {
          String param = null;
          if (from != null) {
              param = from.getParameter(name);
          }
          if (param == null) {
              if (request.getMethod().equals("GET")) {
                  param = getURLParameterDecoded(request, name, "UTF8");
              } else {
                  param = request.getParameter(name);
              }
          }
          return param;
  
      }
  
      public String getParameter(String name, String defaultValue) {
         return getParameter(this.request, this.form, name, defaultValue);
     }
 
     public static String getParameter(HttpServletRequest request, String name, String defaultValue) {
         return getParameter(request, MgnlContext.getPostedForm(), name, defaultValue);
     }
 
     /**
      * Returns the defaultValue if the parameter is not found in the request or form.
      */
     public static String getParameter(HttpServletRequest request, MultipartForm from, String name, String defaultValue) {
         String param = getParameter(request, from, name);
         if (param == null) {
             param = defaultValue;
         }
         return param;
     }
 
     /**
      * @return decoded value
      */
     public static String getURLParameterDecoded(HttpServletRequest request, String name, String charset) {
         return getURLParametersDecoded(request, charset).get(name);
     }
 
     /**
      * The url is not always properly decoded. This method does the job.
      *
      * @return decoded map of all values
      */
     public static Map<String, String> getURLParametersDecoded(HttpServletRequest request, String charset) {
 
         String queryString = request.getQueryString();
         if (queryString != null) {
             return getURLParametersDecoded(queryString, charset);
         }
         return new HashMap<String, String>();
     }
 
     /**
      * Extract and decodes parameters from a query string.
      *
      * @param queryString query string
      * @param charset charset (e.g UTF-8)
      */
     public static Map<String, String> getURLParametersDecoded(String queryString, String charset) {
         Map<String, String> map = new HashMap<String, String>();
         String[] params = queryString.split("&");
         for (int i = 0; i < params.length; i++) {
             String name = StringUtils.substringBefore(params[i], "=");
             String value = StringUtils.substringAfter(params[i], "=");
             try {
                 value = URLDecoder.decode(value, charset);
             } catch (UnsupportedEncodingException e) {
                 // nothing: return value as is
             }
             // @todo what about multi-valued parameters??
             map.put(name, value);
         }
         return map;
     }
 
     public MultipartForm getForm() {
         return form;
     }
 
     /*
      * (non-Javadoc)
      * @see info.magnolia.cms.beans.runtime.MultipartForm#getDocument(java.lang.String)
      */
     public Document getDocument(String name) {
         return form.getDocument(name);
     }
 
     /*
      * (non-Javadoc)
      * @see info.magnolia.cms.beans.runtime.MultipartForm#getDocuments()
      */
     public Map getDocuments() {
         if (form == null) {
             return new HashMap();
         }
 
         return form.getDocuments();
     }
 
     /*
      * (non-Javadoc)
      * @see info.magnolia.cms.beans.runtime.MultipartForm#getParameters()
      */
     public Map getParameters() {
         return getParameters(this.request);
     }
 
     public static Map getParameters(HttpServletRequest request) {
         MultipartForm form = MgnlContext.getPostedForm();
         if (form == null) {
             // if get use UTF8 decoding
             if (request.getMethod() == "GET") {
                 return getURLParametersDecoded(request, "UTF8");
             }
             return request.getParameterMap();
         }
         return form.getParameters();
     }
 
     /*
      * (non-Javadoc)
      * @see info.magnolia.cms.beans.runtime.MultipartForm#getParameterValues(java.lang.String)
      */
     public String[] getParameterValues(String name) {
         if (this.form != null) {
             return this.form.getParameterValues(name);
         }
         return request.getParameterValues(name);
     }
 
     /*
      * (non-Javadoc)
      * @see info.magnolia.cms.beans.runtime.MultipartForm#removeParameter(java.lang.String)
      */
     public void removeParameter(String name) {
         form.removeParameter(name);
     }
 
 }