/**
    * This file Copyright (c) 2019 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.contentapp.browser;
  
  import info.magnolia.objectfactory.ComponentProvider;
  import info.magnolia.ui.availability.AvailabilityChecker;
  import info.magnolia.ui.contentapp.Datasource;
  import info.magnolia.ui.contentapp.configuration.GridViewDefinition;
  import info.magnolia.ui.observation.DatasourceObservation;
  
  import java.util.Arrays;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.vaadin.data.PropertySet;
  import com.vaadin.data.provider.DataProvider;
  import com.vaadin.icons.VaadinIcons;
  import com.vaadin.server.FontIcon;
  import com.vaadin.shared.data.sort.SortDirection;
  import com.vaadin.ui.Grid;
  import com.vaadin.ui.components.grid.HeaderCell;
  import com.vaadin.ui.components.grid.HeaderRow;
  
  /**
   * Base presenter of {@link GridView}.
   *
   * @param <T>
   *     item type
   */
  public abstract class GridViewPresenter<T> {
  
      protected final GridViewDefinition<T> definition;
  
      protected final ComponentProvider componentProvider;
  
      private final AvailabilityChecker availabilityChecker;
      protected final Datasource<T> datasource;
      private final DatasourceObservation datasourceObservation;
  
      private PropertySet<T> propertySet = null;
  
      protected DataProvider<T, ?> dataProvider = null;
  
      protected Grid<T> grid = null;
  
      protected GridViewPresenter(
              GridViewDefinition<T> viewDefinition,
              ComponentProvider componentProvider,
              AvailabilityChecker availabilityChecker,
              Datasource<T> datasource,
              DatasourceObservation datasourceObservation
      ) {
          this.definition = viewDefinition;
          this.componentProvider = componentProvider;
          this.availabilityChecker = availabilityChecker;
          this.datasource = datasource;
          this.datasourceObservation = datasourceObservation;
      }
  
      protected abstract DataProvider<T, ?> createDataProvider();
  
      protected abstract PropertySet<T> createPropertySet();
  
      public Grid<T> grid() {
          if (this.grid == null) {
              this.grid = createGrid();
  
              GridColumnConfigurer<T> columnConfigurer = componentProvider.newInstance(GridColumnConfigurer.class, definition, propertySet());
             grid.setDataProvider(dataProvider());
             columnConfigurer.configureColumns(grid);
 
             grid.addSortListener(event -> event.getSortOrder()
                     .forEach(sortOrder -> {
                         HeaderRow headerRow = grid.getDefaultHeaderRow();
 
                         grid.getColumns().stream()
                                 .map(headerRow::getCell)
                                 .forEach(headerCell -> headerCell.setHtml(headerCell.getText())); //remove existing arrows
 
                         HeaderCell headerCell = headerRow.getCell(sortOrder.getSorted());
                         FontIcon icon = sortOrder.getDirection() == SortDirection.ASCENDING ? VaadinIcons.ARROWS_LONG_UP : VaadinIcons.ARROW_LONG_DOWN;
                         headerCell.setHtml(headerCell.getText() + " " + icon.getHtml());
                     }));
         }
 
 
         return grid;
     }
 
     protected boolean isPropertyEditable(Grid.Column property, T item) {
         return definition.getColumns().stream()
                 .filter(columnDefinition -> StringUtils.equals(columnDefinition.getName(), property.getId()))
                 .findFirst()
                 .map(columnDefinition -> availabilityChecker.isAvailable(columnDefinition.getEditor().getAvailability(), Arrays.asList(item)))
                 .orElse(false);
     }
 
     protected Grid<T> createGrid() {
         return new MagnoliaGrid<>(
                 propertySet(),
                 this::isItemAvailable,
                 this::isPropertyEditable,
                 datasource
         );
     }
 
     protected DataProvider<T, ?> dataProvider() {
         if (this.dataProvider == null) {
             this.dataProvider = createDataProvider();
             this.datasourceObservation.register(this.dataProvider::refreshAll);
         }
         return this.dataProvider;
     }
 
     protected PropertySet<T> propertySet() {
         if (this.propertySet == null) {
             this.propertySet = createPropertySet();
         }
         return this.propertySet;
     }
 
     public boolean isItemAvailable(T item) {
         return true;
     }
 }