/**
    * 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.field;
  
  import static info.magnolia.util.Functions.defaultCombiner;
  
  import info.magnolia.objectfactory.ComponentProvider;
  
  import java.util.Objects;
  import java.util.Optional;
  
  import org.apache.commons.lang3.ArrayUtils;
  
  import com.vaadin.data.Binder;
  import com.vaadin.data.Converter;
  import com.vaadin.data.ErrorMessageProvider;
  import com.vaadin.data.HasValue;
  import com.vaadin.data.ValidationResult;
  import com.vaadin.data.Validator;
  
  /**
   * Applies configuration parameters coming from a {@link FieldDefinition} to the binding builder.
   */
  public interface FieldBinder<T> {
  
      <BT> Binder.BindingBuilder<BT, T> configureBinding(FieldDefinition<T> definition, Binder.BindingBuilder<BT, T> source);
  
      /**
       * Default implementation of {@link FieldBinder}. Will apply such configurable properties
       * as error message, validators and converters.
       *
       * @param <T>
       *     field value type
       */
      class Default<T> implements FieldBinder<T> {
  
          private final ComponentProvider componentProvider;
  
          public Default(ComponentProvider componentProvider) {
              this.componentProvider = componentProvider;
          }
  
          @Override
          public <BT> Binder.BindingBuilder<BT, T> configureBinding(FieldDefinition<T> fieldDefinition, Binder.BindingBuilder<BT, T> source) {
              Binder.BindingBuilder<BT, T> result = source;
  
              if (fieldDefinition.isRequired()) {
                  source.withValidator((value, context) -> {
                      Object inputValue = source.getField().getValue();
                      Object emptyValue = source.getField().getEmptyValue();
                      return Objects.equals(inputValue, emptyValue) ? ValidationResult.error(fieldDefinition.getRequiredErrorMessage()) : ValidationResult.ok();
                  });
              }
  
              result = fieldDefinition.getValidators().stream()
                      .map(this::newValidator)
                      .reduce(result, Binder.BindingBuilder::withValidator, defaultCombiner());
  
              //noinspection unchecked
              result = createConfiguredConverter(fieldDefinition, result.getField()).map(result::withConverter).orElse((Binder.BindingBuilder) result);
  
              return result;
          }
  
          private <VT> Validator<VT> newValidator(FieldValidatorDefinition validatorDefinition, Object... parameters) {
              FieldValidatorFactory fieldValidatorFactory = componentProvider.newInstance(validatorDefinition.getFactoryClass(), ArrayUtils.add(parameters, validatorDefinition));
              return fieldValidatorFactory.createValidator();
          }
 
         protected <PT> Optional<Converter<PT, ?>> createConfiguredConverter(FieldDefinition<PT> definition, HasValue<?> field) {
             ErrorMessageProvider errorMessageProvider = context -> definition.getConversionErrorMessage();
             return Optional.ofNullable(definition.getConverterClass())
                     .map(converterClass -> componentProvider.newInstance(converterClass, definition, field, errorMessageProvider));
         }
     }
 }