/**
    * This file Copyright (c) 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.ui.framework.overlay;
  
  import info.magnolia.ui.DialogBuilder;
  import info.magnolia.ui.framework.ViewProvider;
  import info.magnolia.ui.framework.chooser.Chooser;
  import info.magnolia.ui.framework.chooser.definition.ChooserDefinition;
  import info.magnolia.ui.framework.ioc.SessionStore;
  import info.magnolia.ui.framework.ioc.UiContextBoundComponentProvider;
  import info.magnolia.ui.framework.ioc.UiContextReference;
  
  import java.util.Optional;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import javax.inject.Inject;
  import javax.inject.Singleton;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.google.common.collect.Lists;
  import com.vaadin.ui.Button;
  import com.vaadin.ui.UI;
  
  import lombok.AccessLevel;
  import lombok.AllArgsConstructor;
  import lombok.Getter;
  
  /**
   * Simple utility for handling the lifecycle of {@link Chooser}s.
   */
  @Singleton
  public class ChooserController {
  
      @Inject
      public ChooserController() {
      }
  
      private <T> CompletableFuture<ChooseResult<T>> openChooser(Chooser<T> chooser) {
          CompletableFuture<ChooseResult<T>> result = new CompletableFuture<>();
          AtomicBoolean dialogCommited = new AtomicBoolean(false);
  
          Button cancel = new Button("Cancel");
          cancel.addStyleName("v-button-secondary");
          Button choose = new Button("Select");
          choose.addStyleName("v-button-commit");
          choose.addClickListener(event -> {
              dialogCommited.set(true);
              UI.getCurrent().access(() ->
                      result.complete(ChooseResult.ofChoice(Optional.ofNullable(chooser.getChoice()))));
          });
  
          DialogBuilder.dialog()
                  .withTitle(StringUtils.defaultIfBlank(chooser.getTitle(), "Choose"))
                  .withContent(chooser.asVaadinComponent())
                  .withActions(Lists.newArrayList(cancel, choose))
                  .buildAndOpen()
                  .addCloseListener(e -> {
                      chooser.destroy();
                      if (!dialogCommited.get()) {
                          result.complete(ChooseResult.ofNoChoice());
                      }
                  });
  
          return result;
      }
  
     public <T, C extends Chooser<T>> CompletableFuture<ChooseResult<T>> openChooser(ChooserDefinition<T, ? extends C> definition) {
         return this.openChooser(definition, null);
     }
 
     public <T, C extends Chooser<T>> CompletableFuture<ChooseResult<T>> openChooser(ChooserDefinition<T, ? extends C> definition, T initialChoice) {
         Chooser<T> chooser = getViewProvider(definition.getName()).create(definition);
         chooser.setChoice(initialChoice);
         return openChooser(chooser);
     }
 
     private ViewProvider getViewProvider(String name) {
         UiContextReference contextReference = UiContextReference.ofView(name, UiContextReference.ofCurrentUi());
         SessionStore.access().createBeanStore(contextReference);
 
         return new UiContextBoundComponentProvider(contextReference).getComponent(ViewProvider.class);
     }
 
     /**
      * Holds the choice result.
      * @param <T> choice item type.
      */
     @Getter
     @AllArgsConstructor(access = AccessLevel.PRIVATE)
     public static class ChooseResult<T> {
         boolean chosen;
         Optional<T> choice;
 
         static <T> ChooseResult<T> ofNoChoice() {
             return new ChooseResult<>(false, Optional.empty());
         }
 
         static <T> ChooseResult<T> ofChoice(Optional<T> choice) {
             return new ChooseResult<>(true, choice);
         }
     }
 }