/*
    * 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.syncope.client.console.wicket.ajax.form;
  
  import java.time.Duration;
  import org.apache.syncope.client.ui.commons.HttpResourceStream;
  import org.apache.syncope.client.ui.commons.rest.ResponseHolder;
  import org.apache.wicket.ajax.AjaxRequestTarget;
  import org.apache.wicket.behavior.AbstractAjaxBehavior;
  import org.apache.wicket.request.handler.resource.ResourceStreamRequestHandler;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class AjaxDownloadBehavior extends AbstractAjaxBehavior {
  
      private static final long serialVersionUID = 6833760760338614245L;
  
      protected static final Logger LOG = LoggerFactory.getLogger(AjaxDownloadBehavior.class);
  
      protected ResponseHolder responseHolder;
  
      public void setResponse(final ResponseHolder response) {
          this.responseHolder = response;
      }
  
      /**
       * Call this method to initiate the download.
       *
       * @param target request target.
       */
      public void initiate(final AjaxRequestTarget target) {
          CharSequence url = getCallbackUrl();
          target.appendJavaScript("window.location.href='" + url + "'");
      }
  
      protected HttpResourceStream getResourceStream() {
          HttpResourceStream stream = null;
  
          if (responseHolder != null) {
              stream = new HttpResourceStream(responseHolder);
              responseHolder = null;
          }
  
          return stream;
      }
  
      @Override
      public void onRequest() {
          try {
              HttpResourceStream resourceStream = getResourceStream();
              if (resourceStream != null) {
                  getComponent().getRequestCycle().scheduleRequestHandlerAfterCurrent(
                          new ResourceStreamRequestHandler(
                                  resourceStream, resourceStream.getFilename()).setCacheDuration(Duration.ZERO));
              }
          } catch (Exception e) {
              // cannot be notifies beacause the use of scheduleRequestHandlerAfterCurrent
              LOG.error("Error downloading file", e);
          }
      }
  }