/**
    * This file Copyright (c) 2015 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.dam.external.app.field;
  
  import info.magnolia.dam.api.AssetProvider;
  import info.magnolia.dam.api.AssetProviderRegistry;
  import info.magnolia.dam.api.Item;
  import info.magnolia.dam.api.ItemKey;
  import info.magnolia.dam.api.PathAwareAssetProvider;
  import info.magnolia.ui.form.field.converter.IdentifierToPathConverter;
  
  import java.util.Locale;
  import java.util.regex.Pattern;
  
  import javax.inject.Inject;
  
  import org.apache.commons.lang.StringUtils;
  
  /**
   * Converter between {@link ItemKey} and path.
   */
  public class AssetCompositeIdKeyTranslator implements IdentifierToPathConverter {
  
      private static final Pattern PATH_PATTERN = Pattern.compile("[a-zA-Z0-9]+\\..+(/.+)*");
  
      private final AssetProviderRegistry assetProviderRegistry;
  
      @Inject
      public AssetCompositeIdKeyTranslator(AssetProviderRegistry assetProviderRegistry) {
          this.assetProviderRegistry = assetProviderRegistry;
      }
  
      @Override
      public String convertToModel(String path, Class<? extends String> targetType, Locale locale) throws ConversionException {
          if (StringUtils.isBlank(path)) {
              return null;
          }
          if (!isPath(path)) {
              if (ItemKey.isValid(path)) { // on first item click path is itemKey
                  return path;
              }
          }
          String providerId = StringUtils.substringBefore(path, ".");
          String assetId = StringUtils.substringAfter(path, ".");
          AssetProvider assetProvider = assetProviderRegistry.getProviderById(providerId);
          if (!(assetProvider instanceof PathAwareAssetProvider)) {
              return path;
          }
          Item item = ((PathAwareAssetProvider) assetProvider).getItem(assetId);
          return item.getItemKey().asString();
      }
  
      @Override
      public String convertToPresentation(String itemKeyId, Class<? extends String> targetType, Locale locale) throws ConversionException {
          String res = StringUtils.EMPTY;
          if (StringUtils.isBlank(itemKeyId)) {
              return res;
          }
          if (!ItemKey.isValid(itemKeyId)) {
              return res;
          }
          if (isPath(itemKeyId)) {
              return res;
          }
          String providerId = ItemKey.from(itemKeyId).getProviderId();
          AssetProvider assetProvider = assetProviderRegistry.getProviderById(providerId);
          Item item = assetProvider.getItem(ItemKey.from(itemKeyId));
          return assetProvider.getIdentifier() + "." + item.getPath();
     }
 
     private boolean isPath(String id) {
         return PATH_PATTERN.matcher(id).matches();
     }
 
     @Override
     public Class<String> getModelType() {
         return String.class;
     }
 
     @Override
     public Class<String> getPresentationType() {
         return String.class;
     }
 
     @Override
     public void setWorkspaceName(String workspaceName) {};
 }