/*
    * 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.ui.commons.panels;
  
  import java.net.URLEncoder;
  import java.nio.charset.StandardCharsets;
  import java.util.List;
  import org.apache.syncope.client.ui.commons.BaseSession;
  import org.apache.syncope.client.ui.commons.Constants;
  import org.apache.syncope.client.ui.commons.SAML2SP4UIConstants;
  import org.apache.syncope.client.ui.commons.markup.html.form.AjaxDropDownChoicePanel;
  import org.apache.syncope.common.lib.to.SAML2SP4UIIdPTO;
  import org.apache.syncope.common.rest.api.service.SAML2SP4UIIdPService;
  import org.apache.wicket.ajax.AjaxRequestTarget;
  import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
  import org.apache.wicket.markup.html.form.IChoiceRenderer;
  import org.apache.wicket.model.IModel;
  import org.apache.wicket.model.Model;
  import org.apache.wicket.request.UrlUtils;
  import org.apache.wicket.request.cycle.RequestCycle;
  import org.apache.wicket.request.http.handler.RedirectRequestHandler;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public abstract class AbstractSAMLSSOLoginFormPanel extends BaseSSOLoginFormPanel {
  
      private static final Logger LOG = LoggerFactory.getLogger(AbstractSAMLSSOLoginFormPanel.class);
  
      private static final long serialVersionUID = 1153528484703183466L;
  
      public AbstractSAMLSSOLoginFormPanel(final String id, final BaseSession session) {
          super(id);
  
          List<SAML2SP4UIIdPTO> available = session.getAnonymousService(SAML2SP4UIIdPService.class).list();
  
          Model<SAML2SP4UIIdPTO> model = new Model<>();
          AjaxDropDownChoicePanel<SAML2SP4UIIdPTO> idps =
                  new AjaxDropDownChoicePanel<>("idps", "SAML 2.0", model, false);
          idps.setChoices(available);
          idps.setChoiceRenderer(new IChoiceRenderer<>() {
  
              private static final long serialVersionUID = 1814750973898916102L;
  
              @Override
              public Object getDisplayValue(final SAML2SP4UIIdPTO object) {
                  return object.getName();
              }
  
              @Override
              public String getIdValue(final SAML2SP4UIIdPTO object, final int index) {
                  return object.getEntityID();
              }
  
              @Override
              public SAML2SP4UIIdPTO getObject(
                  final String id, final IModel<? extends List<? extends SAML2SP4UIIdPTO>> choices) {
  
                  return choices.getObject().stream().
                      filter(idp -> idp.getEntityID().equals(id)).findFirst().orElse(null);
              }
          });
          idps.getField().add(new AjaxFormComponentUpdatingBehavior(Constants.ON_CHANGE) {
  
              private static final long serialVersionUID = -1107858522700306810L;
  
              @Override
              protected void onUpdate(final AjaxRequestTarget target) {
                  if (model.getObject() != null) {
                      try {
                          RequestCycle.get().scheduleRequestHandlerAfterCurrent(new RedirectRequestHandler(
                                  UrlUtils.rewriteToContextRelative(SAML2SP4UIConstants.URL_CONTEXT + "/login?idp="
                                          + URLEncoder.encode(
                                                  model.getObject().getEntityID(), StandardCharsets.UTF_8),
                                          RequestCycle.get())));
                      } catch (Exception e) {
                          LOG.error("Could not redirect to the selected IdP {}", model.getObject().getEntityID(), e);
                      }
                  }
              }
          });
          idps.setOutputMarkupPlaceholderTag(true);
          idps.setVisible(!available.isEmpty());
          add(idps);
     }
 }