/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.maven.internal.impl;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.Reader;
  import java.io.Writer;
  import java.net.URL;
  import java.nio.file.Files;
  import java.nio.file.Path;
  
  import org.apache.maven.api.annotations.Nonnull;
  import org.apache.maven.api.model.InputSource;
  import org.apache.maven.api.model.Model;
  import org.apache.maven.api.services.xml.ModelXmlFactory;
  import org.apache.maven.api.services.xml.XmlReaderException;
  import org.apache.maven.api.services.xml.XmlReaderRequest;
  import org.apache.maven.api.services.xml.XmlWriterException;
  import org.apache.maven.api.services.xml.XmlWriterRequest;
  import org.apache.maven.model.v4.MavenStaxReader;
  import org.apache.maven.model.v4.MavenStaxWriter;
  
  import static org.apache.maven.internal.impl.Utils.nonNull;
  
  @Named
  @Singleton
  public class DefaultModelXmlFactory implements ModelXmlFactory {
      @Override
      public Model read(@Nonnull XmlReaderRequest request) throws XmlReaderException {
          nonNull(request, "request");
          Path path = request.getPath();
          URL url = request.getURL();
          Reader reader = request.getReader();
          InputStream inputStream = request.getInputStream();
          if (path == null && url == null && reader == null && inputStream == null) {
              throw new IllegalArgumentException("path, url, reader or inputStream must be non null");
          }
          try {
              InputSource source = null;
              if (request.getModelId() != null || request.getLocation() != null) {
                  source = new InputSource(request.getModelId(), request.getLocation());
              }
              MavenStaxReader xml = new MavenStaxReader();
              xml.setAddDefaultEntities(request.isAddDefaultEntities());
              if (inputStream != null) {
                  return xml.read(inputStream, request.isStrict(), source);
              } else if (reader != null) {
                  return xml.read(reader, request.isStrict(), source);
              } else if (path != null) {
                  try (InputStream is = Files.newInputStream(path)) {
                      return xml.read(is, request.isStrict(), source);
                  }
              } else {
                  try (InputStream is = url.openStream()) {
                      return xml.read(is, request.isStrict(), source);
                  }
              }
          } catch (Exception e) {
              throw new XmlReaderException("Unable to read model", e);
          }
      }
  
      @Override
      public void write(XmlWriterRequest<Model> request) throws XmlWriterException {
          nonNull(request, "request");
          Model content = nonNull(request.getContent(), "content");
          Path path = request.getPath();
          OutputStream outputStream = request.getOutputStream();
          Writer writer = request.getWriter();
          if (writer == null && outputStream == null && path == null) {
              throw new IllegalArgumentException("writer, outputStream or path must be non null");
          }
          try {
              if (writer != null) {
                  new MavenStaxWriter().write(writer, content);
              } else if (outputStream != null) {
                  new MavenStaxWriter().write(outputStream, content);
              } else {
                  try (OutputStream os = Files.newOutputStream(path)) {
                     new MavenStaxWriter().write(outputStream, content);
                 }
             }
         } catch (Exception e) {
             throw new XmlWriterException("Unable to write model", e);
         }
     }
 
     /**
      * Simply parse the given xml string.
      *
      * @param xml the input xml string
      * @return the parsed object
      * @throws XmlReaderException if an error occurs during the parsing
      * @see #toXmlString(Object)
      */
     public static Model fromXml(@Nonnull String xml) throws XmlReaderException {
         return new DefaultModelXmlFactory().fromXmlString(xml);
     }
 
     /**
      * Simply converts the given content to an xml string.
      *
      * @param content the object to convert
      * @return the xml string representation
      * @throws XmlWriterException if an error occurs during the transformation
      * @see #fromXmlString(String)
      */
     public static String toXml(@Nonnull Model content) throws XmlWriterException {
         return new DefaultModelXmlFactory().toXmlString(content);
     }
 }