/**
    * 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.task.app;
  
  import info.magnolia.context.Context;
  import info.magnolia.objectfactory.Components;
  import info.magnolia.task.Task;
  import info.magnolia.ui.field.FieldDefinition;
  import info.magnolia.ui.datasource.PropertySetFactory;
  
  import java.time.Instant;
  import java.time.LocalDateTime;
  import java.time.ZoneId;
  import java.time.format.DateTimeFormatter;
  import java.util.Calendar;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Optional;
  import java.util.stream.Stream;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.commons.lang3.time.FastDateFormat;
  
  import com.vaadin.data.BeanPropertySet;
  import com.vaadin.data.PropertyDefinition;
  import com.vaadin.data.PropertySet;
  import com.vaadin.data.ValueProvider;
  import com.vaadin.server.Setter;
  
  import lombok.AllArgsConstructor;
  
  /**
   * Property set factory for tasks.
   */
  public class TasksPropertySetFactory implements PropertySetFactory<Task> {
  
      @Override
      public PropertySet<Task> withProperties(Map<String, Class> properties) {
          return BeanPropertySet.get(Task.class);
      }
  
      @Override
      public PropertySet<Task> fromFieldDefinitions(Collection<FieldDefinition> fieldDefinitions, Locale locale) {
          return new PropertySet<Task>() {
              private final PropertySet<Task> propertySet = BeanPropertySet.get(Task.class);
  
              @Override
              public Stream<PropertyDefinition<Task, ?>> getProperties() {
                  return fieldDefinitions.stream().map(editorPropertyDefinition -> new TaskPropertyDefinition(propertySet, editorPropertyDefinition.getName()));
              }
  
              @Override
              public Optional<PropertyDefinition<Task, ?>> getProperty(String name) {
                  return getProperties().filter(taskPropertyDefinition -> taskPropertyDefinition.getName().equals(name)).findFirst();
              }
          };
      }
  
      @AllArgsConstructor
      private class TaskPropertyDefinition implements PropertyDefinition<Task, Object> {
          private PropertySet<Task> propertySet;
          private String name;
  
          @Override
          public ValueProvider<Task, Object> getGetter() {
              return name.contains(".") ? getTaskObjectValueProvider() : (ValueProvider<Task, Object>) propertySet.getProperty(name).map(PropertyDefinition::getGetter).get();
         }
 
         private ValueProvider<Task, Object> getTaskObjectValueProvider() {
             return (ValueProvider<Task, Object>) task -> {
                 Map subPropertySet = propertySet.getProperty(StringUtils.substringBefore(name, "."))
                         .map(PropertyDefinition::getGetter)
                         .map(taskValueProvider -> taskValueProvider.apply(task))
                         .filter(Map.class::isInstance)
                         .map(Map.class::cast)
                         .orElse(new HashMap());
 
                 return Optional.ofNullable(subPropertySet.get(StringUtils.substringAfter(name, ".")))
                         .map(object -> object instanceof Calendar ? getLocalDateTime(((Calendar) object).getTimeInMillis()).format(DateTimeFormatter.ofPattern(getDateTimePattern())) : String.valueOf(object))
                         .orElse(StringUtils.EMPTY);
             };
         }
 
         private String getDateTimePattern() {
             Locale locale = Components.getComponent(Context.class).getLocale();
             return FastDateFormat.getDateTimeInstance(FastDateFormat.MEDIUM, FastDateFormat.SHORT, locale).getPattern();
         }
 
         private LocalDateTime getLocalDateTime(long ms) {
             return Instant.ofEpochMilli(ms)
                     .atZone(ZoneId.systemDefault())
                     .toLocalDateTime();
         }
 
         @Override
         public Optional<Setter<Task, Object>> getSetter() {
             return Optional.empty();
         }
 
         @Override
         public Class<Object> getType() {
             return Object.class;
         }
 
         public Class<?> getPropertyHolderType() {
             return Task.class;
         }
 
         @Override
         public String getName() {
             return name;
         }
 
         @Override
         public PropertySet<Task> getPropertySet() {
             return propertySet;
         }
 
         @Override
         public String getCaption() {
             return name.toUpperCase();
         }
 
     }
 
 }