/*
    * 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.plugins.changes;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.maven.plugin.logging.Log;
  import org.apache.maven.plugins.changes.model.Body;
  import org.apache.maven.plugins.changes.model.ChangesDocument;
  import org.apache.maven.plugins.changes.model.Properties;
  import org.apache.maven.plugins.changes.model.Release;
  import org.apache.maven.plugins.changes.model.io.xpp3.ChangesXpp3Reader;
  
  /**
   * A facade for a changes.xml file.
   *
   * @version $Id$
   */
  public class ChangesXML {
  
      /** The list of releases in the changes.xml file. */
      private List<Release> releaseList;
  
      /** The author in the changes.xml file. */
      private String author;
  
      /** The title of the changes.xml file. */
      private String title;
  
      /** The e-mail address of the author in the changes.xml file. */
      private String authorEmail;
  
      /** The changes.xml document. */
      private ChangesDocument changesDocument;
  
      /**
       * Constructor that sets the changes.xml file and the logger.
       *
       * @param xmlPath the changes.xml file
       * @param log the logger
       * @throws ChangesXMLRuntimeException if there was a fatal error while parsing the changes.xml file
       */
      public ChangesXML(File xmlPath, Log log) throws ChangesXMLRuntimeException {
  
          if (xmlPath == null || !xmlPath.exists()) {
              log.error("changes xml file is null or not exists ");
              return;
          }
  
          try {
  
              ChangesXpp3Reader reader = new ChangesXpp3Reader();
  
              try (FileInputStream fileInputStream = new FileInputStream(xmlPath)) {
                  changesDocument = reader.read(fileInputStream, false);
              }
  
              if (changesDocument == null) {
                  log.error("Cannot build Changes Report from file: " + xmlPath.getPath());
                  return;
              }
  
              Properties properties = changesDocument.getProperties();
  
              if (properties != null) {
                  if (properties.getAuthor() != null) {
                      this.author = properties.getAuthor().getName();
                      this.authorEmail = properties.getAuthor().getName();
                  }
                  this.title = properties.getTitle();
              }
  
              Body body = changesDocument.getBody();
  
              if (body != null) {
                  this.releaseList = body.getReleases();
              }
  
          } catch (Throwable e) {
              log.error("An error occurred when parsing the changes.xml file: ", e);
             throw new ChangesXMLRuntimeException("An error occurred when parsing the changes.xml file", e);
         }
     }
 
     /**
      * Sets the {@link ChangesXML#author} attribute.
      *
      * @param author the new value of the {@link ChangesXML#author} attribute
      */
     public void setAuthor(String author) {
         this.author = author;
     }
 
     /**
      * Returns the current value of the author attribute.
      *
      * @return the current value of the author attribute
      */
     public String getAuthor() {
         return author;
     }
 
     /**
      * Sets the {@link ChangesXML#releaseList} attribute.
      *
      * @param releaseList the new value of the {@link ChangesXML#releaseList} attribute
      */
     public void setReleaseList(List<Release> releaseList) {
         this.releaseList = releaseList;
     }
 
     /**
      * Returns the current value of the {@link ChangesXML#releaseList} attribute.
      *
      * @return the current value of the {@link ChangesXML#releaseList} attribute
      */
     public List<Release> getReleaseList() {
         return releaseList == null ? Collections.<Release>emptyList() : releaseList;
     }
 
     /**
      * Sets the {@link ChangesXML#title} attribute.
      *
      * @param title the new value of the {@link ChangesXML#title} attribute
      */
     public void setTitle(String title) {
         this.title = title;
     }
 
     /**
      * Returns the current value of the {@link ChangesXML#title} attribute.
      *
      * @return the current value of the {@link ChangesXML#title} attribute
      */
     public String getTitle() {
         return title;
     }
 
     /**
      * Returns the current value of the {@link ChangesXML#changesDocument} attribute.
      *
      * @return the current value of the {@link ChangesXML#changesDocument} attribute
      */
     public ChangesDocument getChangesDocument() {
         return changesDocument;
     }
 
     /**
      * Returns the current value of the {@link ChangesXML#authorEmail} attribute.
      *
      * @return the current value of the {@link ChangesXML#authorEmail} attribute
      */
     public String getAuthorEmail() {
         return authorEmail;
     }
 
     /**
      * Sets the {@link ChangesXML#authorEmail} attribute.
      *
      * @param authorEmail the new value of the {@link ChangesXML#authorEmail} attribute
      */
     public void setAuthorEmail(String authorEmail) {
         this.authorEmail = authorEmail;
     }
 }