/*
    * 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.schematype;
  
  import gov.nist.secauto.metaschema.core.model.IValuedDefinition;
  import gov.nist.secauto.metaschema.core.util.CollectionUtil;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  import gov.nist.secauto.metaschema.schemagen.SchemaGenerationException;
  import gov.nist.secauto.metaschema.schemagen.xml.XmlSchemaGenerator;
  import gov.nist.secauto.metaschema.schemagen.xml.impl.XmlGenerationState;
  
  import java.util.LinkedList;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import javax.xml.namespace.QName;
  import javax.xml.stream.XMLStreamException;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  public class XmlSimpleTypeUnion
      extends AbstractXmlSimpleType {
    @NonNull
    private final List<IXmlSimpleType> simpleTypes;
  
    public XmlSimpleTypeUnion(
        @NonNull QName qname,
        @NonNull IValuedDefinition definition,
        @NonNull IXmlSimpleType... simpleTypes) {
      super(qname, definition);
      this.simpleTypes = CollectionUtil.requireNonEmpty(CollectionUtil.listOrEmpty(simpleTypes));
    }
  
    @NonNull
    public List<IXmlSimpleType> getSimpleTypes() {
      return simpleTypes;
    }
  
    @Override
    public void generateType(XmlGenerationState state, boolean anonymous) { // NOPMD unavoidable complexity
      try {
        state.writeStartElement(XmlSchemaGenerator.PREFIX_XML_SCHEMA, "simpleType", XmlSchemaGenerator.NS_XML_SCHEMA);
  
        if (!anonymous) {
          state.writeAttribute("name", ObjectUtils.notNull(getQName().getLocalPart()));
        }
  
        state.writeStartElement(XmlSchemaGenerator.PREFIX_XML_SCHEMA, "union", XmlSchemaGenerator.NS_XML_SCHEMA);
  
        List<IXmlSimpleType> memberTypes = new LinkedList<>();
        List<IXmlSimpleType> inlineTypes = new LinkedList<>();
        for (IXmlSimpleType unionType : simpleTypes) {
          if (unionType.isGeneratedType(state) && unionType.isInline(state)) {
            inlineTypes.add(unionType);
          } else {
            memberTypes.add(unionType);
          }
        }
  
        if (!memberTypes.isEmpty()) {
          state.writeAttribute(
              "memberTypes",
              ObjectUtils.notNull(memberTypes.stream()
                  .map(type -> type.getTypeReference())
                  .collect(Collectors.joining(" "))));
        }
  
        for (IXmlSimpleType inlineType : inlineTypes) {
          inlineType.generateType(state, true);
        }
  
        state.writeEndElement(); // xs:union
        state.writeEndElement(); // xs:simpleType
  
        for (IXmlSimpleType memberType : memberTypes) {
         memberType.generateType(state, false);
       }
     } catch (XMLStreamException ex) {
       throw new SchemaGenerationException(ex);
     }
   }
 }