/*
    * 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.markup.html.form;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Optional;
  import org.apache.wicket.AttributeModifier;
  import org.apache.wicket.Component;
  import org.apache.wicket.MarkupContainer;
  import org.apache.wicket.ajax.AjaxRequestTarget;
  import org.apache.wicket.markup.html.WebMarkupContainer;
  import org.apache.wicket.markup.html.form.Form;
  import org.apache.wicket.markup.html.form.FormComponent;
  import org.apache.wicket.markup.html.form.IFormVisitorParticipant;
  import org.apache.wicket.markup.html.list.Loop;
  import org.apache.wicket.markup.html.list.LoopItem;
  import org.apache.wicket.model.PropertyModel;
  import org.wicketstuff.egrid.column.AbstractEditablePropertyColumn;
  import org.wicketstuff.egrid.column.EditableCellPanel;
  import org.wicketstuff.egrid.component.EditableDataTable;
  import org.wicketstuff.egrid.component.EditableGridSubmitLink;
  import org.wicketstuff.egrid.toolbar.AbstractEditableGridToolbar;
  
  public abstract class AjaxGridBottomToolbar<T, S> extends AbstractEditableGridToolbar {
  
      private static final long serialVersionUID = 1L;
  
      protected static final String CELL_ID = "cell";
  
      protected static final String CELLS_ID = "cells";
  
      protected T newRow = null;
  
      public AjaxGridBottomToolbar(final EditableDataTable<?, ?> table) {
          super(table);
  
          newRow = newRowInstance();
  
          MarkupContainer td = new WebMarkupContainer("td");
          td.add(new AttributeModifier("colspan", table.getColumns().size() - 1));
          AddToolBarForm addToolBarForm = new AddToolBarForm("addToolbarForm");
          td.add(addToolBarForm);
          add(td);
          add(newAddButton(addToolBarForm));
      }
  
      protected abstract T newRowInstance();
  
      protected abstract void onAdd(AjaxRequestTarget target, T newRow);
  
      protected void onError(final AjaxRequestTarget target) {
      }
  
      protected class AddToolBarForm extends Form<T> implements IFormVisitorParticipant {
  
          protected static final long serialVersionUID = 1L;
  
          public AddToolBarForm(final String id) {
              super(id);
              add(newEditorComponents());
          }
  
          @Override
          public boolean processChildren() {
              return Optional.ofNullable(getRootForm().findSubmitter()).
                      map(submitter -> submitter.getForm() == this).
                      orElse(false);
          }
      }
  
      protected Component newAddButton(final WebMarkupContainer encapsulatingContainer) {
          return new EditableGridSubmitLink("add", encapsulatingContainer) {
  
              protected static final long serialVersionUID = 1L;
  
              @Override
              protected void onSuccess(final AjaxRequestTarget target) {
                  onAdd(target, newRow);
                  newRow = newRowInstance();
                  target.add(getTable());
              }
  
             @Override
             protected void onError(final AjaxRequestTarget target) {
                 AjaxGridBottomToolbar.this.onError(target);
             }
         };
     }
 
     protected Loop newEditorComponents() {
         List<AbstractEditablePropertyColumn<T, S>> columns = getEditableColumns();
         return new Loop(CELLS_ID, columns.size()) {
 
             protected static final long serialVersionUID = 1L;
 
             @Override
             protected void populateItem(final LoopItem item) {
                 addEditorComponent(item, getEditorColumn(columns, item.getIndex()));
             }
         };
     }
 
     protected void addEditorComponent(final LoopItem item, final AbstractEditablePropertyColumn<T, S> toolBarCell) {
         item.add(newCell(toolBarCell));
     }
 
     @SuppressWarnings("unchecked")
     protected List<AbstractEditablePropertyColumn<T, S>> getEditableColumns() {
         List<AbstractEditablePropertyColumn<T, S>> columns = new ArrayList<>();
         getTable().getColumns().stream().
                 filter(AbstractEditablePropertyColumn.class::isInstance).
                 map(AbstractEditablePropertyColumn.class::cast).
                 forEach(columns::add);
         return columns;
     }
 
     protected Component newCell(final AbstractEditablePropertyColumn<T, S> editableGridColumn) {
         EditableCellPanel panel = editableGridColumn.getEditableCellPanel(CELL_ID);
         FormComponent<?> editorComponent = panel.getEditableComponent();
         editorComponent.setDefaultModel(new PropertyModel<T>(newRow, editableGridColumn.getPropertyExpression()));
         return panel;
     }
 
     protected AbstractEditablePropertyColumn<T, S> getEditorColumn(
             final List<AbstractEditablePropertyColumn<T, S>> editorColumn, final int index) {
 
         return editorColumn.get(index);
     }
 }