/*
    * Portions of this software was developed by employees of the National Institute
    * of Standards and Technology (NIST), an agency of the Federal Government and is
    * being made available as a public service. Pursuant to title 17 United States
    * Code Section 105, works of NIST employees are not subject to copyright
    * protection in the United States. This software may be subject to foreign
    * copyright. Permission in the United States and in foreign countries, to the
    * extent that NIST may hold copyright, to use, copy, modify, create derivative
    * works, and distribute this software and its documentation without fee is hereby
   * granted on a non-exclusive basis, provided that this notice and disclaimer
   * of warranty appears in all copies.
   *
   * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
   * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
   * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
   * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
   * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE.  IN NO EVENT
   * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
   * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
   * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
   * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
   * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
   * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
   */
  
  package gov.nist.secauto.metaschema.schemagen.xml.datatype;
  
  import gov.nist.secauto.metaschema.core.model.IModule;
  import gov.nist.secauto.metaschema.core.util.CollectionUtil;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  import gov.nist.secauto.metaschema.schemagen.datatype.IDatatypeContent;
  
  import org.jdom2.Attribute;
  import org.jdom2.Element;
  import org.jdom2.filter.Filters;
  import org.jdom2.xpath.XPathExpression;
  import org.jdom2.xpath.XPathFactory;
  
  import java.io.InputStream;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  public class XmlCoreDatatypeProvider
      extends AbstractXmlDatatypeProvider {
  
    @Override
    protected InputStream getSchemaResource() {
      return IModule.class.getResourceAsStream("/schema/xml/metaschema-datatypes.xsd");
    }
  
    @Override
    protected List<Element> queryElements(JDom2XmlSchemaLoader loader) {
      return loader.getContent(
          "/xs:schema/xs:simpleType",
          CollectionUtil.singletonMap("xs", JDom2XmlSchemaLoader.NS_XML_SCHEMA));
    }
  
    @NonNull
    private static List<String> analyzeDependencies(@NonNull Element element) {
      XPathExpression<Attribute> xpath = XPathFactory.instance().compile(".//@base", Filters.attribute());
      return ObjectUtils.notNull(xpath.evaluate(element).stream()
          .map(attr -> attr.getValue())
          .filter(type -> !type.startsWith("xs:"))
          .distinct()
          .collect(Collectors.toList()));
    }
  
    @Override
    protected @NonNull Map<String, IDatatypeContent> handleResults(
        @NonNull List<Element> items) {
      return ObjectUtils.notNull(items.stream()
          .map(element -> {
            return (IDatatypeContent) new JDom2DatatypeContent(
                ObjectUtils.requireNonNull(element.getAttributeValue("name")),
                CollectionUtil.singletonList(element),
                analyzeDependencies(element));
          }).collect(Collectors.toMap(content -> content.getTypeName(), Function.identity(), (e1, e2) -> e2,
              LinkedHashMap::new)));
    }
  }