/*
    * 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.scm;
  
  import java.io.Serializable;
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Date;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.maven.scm.provider.ScmProviderRepository;
  import org.apache.maven.scm.util.FilenameUtils;
  import org.apache.maven.scm.util.ThreadSafeDateFormat;
  import org.codehaus.plexus.util.StringUtils;
  
  /**
   * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>
   *
   */
  public class ChangeSet implements Serializable {
      /**
       *
       */
      private static final long serialVersionUID = 7097705862222539801L;
  
      /**
       * Escaped <code>&lt;</code> entity
       */
      public static final String LESS_THAN_ENTITY = "&lt;";
  
      /**
       * Escaped <code>&gt;</code> entity
       */
      public static final String GREATER_THAN_ENTITY = "&gt;";
  
      /**
       * Escaped <code>&amp;</code> entity
       */
      public static final String AMPERSAND_ENTITY = "&amp;";
  
      /**
       * Escaped <code>'</code> entity
       */
      public static final String APOSTROPHE_ENTITY = "&apos;";
  
      /**
       * Escaped <code>"</code> entity
       */
      public static final String QUOTE_ENTITY = "&quot;";
  
      private static final String DATE_PATTERN = "yyyy-MM-dd";
  
      /**
       * Formatter used by the getDateFormatted method.
       */
      private static final ThreadSafeDateFormat DATE_FORMAT = new ThreadSafeDateFormat(DATE_PATTERN);
  
      private static final String TIME_PATTERN = "HH:mm:ss";
  
      /**
       * Formatter used by the getTimeFormatted method.
       */
      private static final ThreadSafeDateFormat TIME_FORMAT = new ThreadSafeDateFormat(TIME_PATTERN);
  
      /**
       * Formatter used to parse date/timestamp.
       */
      private static final ThreadSafeDateFormat TIMESTAMP_FORMAT_1 = new ThreadSafeDateFormat("yyyy/MM/dd HH:mm:ss");
  
      private static final ThreadSafeDateFormat TIMESTAMP_FORMAT_2 = new ThreadSafeDateFormat("yyyy-MM-dd HH:mm:ss");
  
      private static final ThreadSafeDateFormat TIMESTAMP_FORMAT_3 = new ThreadSafeDateFormat("yyyy/MM/dd HH:mm:ss z");
  
      private static final ThreadSafeDateFormat TIMESTAMP_FORMAT_4 = new ThreadSafeDateFormat("yyyy-MM-dd HH:mm:ss z");
  
      /**
       * Date the changes were committed
       */
      private Date date;
 
     /**
      * User who made changes
      */
     private String author;
 
     /**
      * comment provided at commit time
      */
     private String comment = "";
 
     /**
      * List of ChangeFile
      */
     private List<ChangeFile> files;
 
     /**
      * List of tags
      */
     private List<String> tags;
 
     /**
      * The SCM revision id for this changeset.
      * @since 1.3
      */
     private String revision;
 
     /**
      * Revision from which this one originates
      * @since 1.7
      */
     private String parentRevision;
 
     /**
      * Revisions that were merged into this one
      * @since 1.7
      */
     private Set<String> mergedRevisions;
 
     /**
      * @param strDate         Date the changes were committed
      * @param userDatePattern pattern of date
      * @param comment         comment provided at commit time
      * @param author          User who made changes
      * @param files           The ChangeFile list
      */
     public ChangeSet(String strDate, String userDatePattern, String comment, String author, List<ChangeFile> files) {
         this(null, comment, author, files);
 
         setDate(strDate, userDatePattern);
     }
 
     /**
      * @param date    Date the changes were committed
      * @param comment comment provided at commit time
      * @param author  User who made changes
      * @param files   The ChangeFile list
      */
     public ChangeSet(Date date, String comment, String author, List<ChangeFile> files) {
         setDate(date);
 
         setAuthor(author);
 
         setComment(comment);
 
         this.files = files;
     }
 
     /**
      * Constructor used when attributes aren't available until later
      */
     public ChangeSet() {
         // no op
     }
 
     /**
      * Getter for ChangeFile list.
      *
      * @return List of ChangeFile.
      */
     public List<ChangeFile> getFiles() {
         if (files == null) {
             return new ArrayList<ChangeFile>();
         }
         return files;
     }
 
     /**
      * Setter for ChangeFile list.
      *
      * @param files List of ChangeFiles.
      */
     public void setFiles(List<ChangeFile> files) {
         this.files = files;
     }
 
     public void addFile(ChangeFile file) {
         if (files == null) {
             files = new ArrayList<ChangeFile>();
         }
 
         files.add(file);
     }
 
     /**
      * @deprecated Use method {@link #containsFilename(String)}
      * @param filename TODO
      * @param repository NOT USED
      * @return TODO
      */
     public boolean containsFilename(String filename, ScmProviderRepository repository) {
         return containsFilename(filename);
     }
 
     public boolean containsFilename(String filename) {
         if (files != null) {
             for (ChangeFile file : files) {
                 String f1 = FilenameUtils.normalizeFilename(file.getName());
                 String f2 = FilenameUtils.normalizeFilename(filename);
                 if (f1.indexOf(f2) >= 0) {
                     return true;
                 }
             }
         }
 
         return false;
     }
 
     /**
      * Getter for property author.
      *
      * @return Value of property author.
      */
     public String getAuthor() {
         return author;
     }
 
     /**
      * Setter for property author.
      *
      * @param author New value of property author.
      */
     public void setAuthor(String author) {
         this.author = author;
     }
 
     /**
      * Getter for property comment.
      *
      * @return Value of property comment.
      */
     public String getComment() {
         return comment;
     }
 
     /**
      * Setter for property comment.
      *
      * @param comment New value of property comment.
      */
     public void setComment(String comment) {
         this.comment = comment;
     }
 
     /**
      * Getter for property date.
      *
      * @return Value of property date.
      */
     public Date getDate() {
         if (date != null) {
             return (Date) date.clone();
         }
 
         return null;
     }
 
     /**
      * Setter for property date.
      *
      * @param date New value of property date.
      */
     public void setDate(Date date) {
         if (date != null) {
             this.date = new Date(date.getTime());
         }
     }
 
     /**
      * Setter for property date that takes a string and parses it
      *
      * @param date - a string in yyyy/MM/dd HH:mm:ss format
      */
     public void setDate(String date) {
         setDate(date, null);
     }
 
     /**
      * Setter for property date that takes a string and parses it
      *
      * @param date            - a string in yyyy/MM/dd HH:mm:ss format
      * @param userDatePattern - pattern of date
      */
     public void setDate(String date, String userDatePattern) {
         try {
             if (!StringUtils.isEmpty(userDatePattern)) {
                 SimpleDateFormat format = new SimpleDateFormat(userDatePattern);
 
                 this.date = format.parse(date);
             } else {
                 this.date = TIMESTAMP_FORMAT_3.parse(date);
             }
         } catch (ParseException e) {
             if (!StringUtils.isEmpty(userDatePattern)) {
                 try {
                     this.date = TIMESTAMP_FORMAT_3.parse(date);
                 } catch (ParseException pe) {
                     try {
                         this.date = TIMESTAMP_FORMAT_4.parse(date);
                     } catch (ParseException pe1) {
                         try {
                             this.date = TIMESTAMP_FORMAT_1.parse(date);
                         } catch (ParseException pe2) {
                             try {
                                 this.date = TIMESTAMP_FORMAT_2.parse(date);
                             } catch (ParseException pe3) {
                                 throw new IllegalArgumentException("Unable to parse date: " + date);
                             }
                         }
                     }
                 }
             } else {
                 try {
                     this.date = TIMESTAMP_FORMAT_4.parse(date);
                 } catch (ParseException pe1) {
                     try {
                         this.date = TIMESTAMP_FORMAT_1.parse(date);
                     } catch (ParseException pe2) {
                         try {
                             this.date = TIMESTAMP_FORMAT_2.parse(date);
                         } catch (ParseException pe3) {
                             throw new IllegalArgumentException("Unable to parse date: " + date);
                         }
                     }
                 }
             }
         }
     }
 
     /**
      * @return date in yyyy-mm-dd format
      */
     public String getDateFormatted() {
         return DATE_FORMAT.format(getDate());
     }
 
     /**
      * @return time in HH:mm:ss format
      */
     public String getTimeFormatted() {
         return TIME_FORMAT.format(getDate());
     }
 
     /**
      * Getter for property tags.
      *
      * @return Value of property author.
      */
     public List<String> getTags() {
         if (tags == null) {
             return new ArrayList<>();
         }
         return tags;
     }
 
     /**
      * Setter for property tags.
      *
      * @param tags New value of property tags. This replaces the existing list (if any).
      */
     public void setTags(List<String> tags) {
         this.tags = tags;
     }
 
     /**
      * Setter for property tags.
      *
      * @param tag New tag to add to the list of tags.
      */
     public void addTag(String tag) {
         if (tag == null) {
             return;
         }
         tag = tag.trim();
         if (tag.isEmpty()) {
             return;
         }
         if (tags == null) {
             tags = new ArrayList<>();
         }
         tags.add(tag);
     }
 
     /**
      * @return TODO
      * @since 1.3
      */
     public String getRevision() {
         return revision;
     }
 
     /**
      * @param revision TODO
      * @since 1.3
      */
     public void setRevision(String revision) {
         this.revision = revision;
     }
 
     public String getParentRevision() {
         return parentRevision;
     }
 
     public void setParentRevision(String parentRevision) {
         this.parentRevision = parentRevision;
     }
 
     public void addMergedRevision(String mergedRevision) {
         if (mergedRevisions == null) {
             mergedRevisions = new LinkedHashSet<String>();
         }
         mergedRevisions.add(mergedRevision);
     }
 
     public Set<String> getMergedRevisions() {
         return mergedRevisions == null ? Collections.<String>emptySet() : mergedRevisions;
     }
 
     public void setMergedRevisions(Set<String> mergedRevisions) {
         this.mergedRevisions = mergedRevisions;
     }
 
     /** {@inheritDoc} */
     public String toString() {
         StringBuilder result = new StringBuilder(author == null ? " null " : author);
         result.append("\n").append(date == null ? "null " : date.toString()).append("\n");
         List<String> tags = getTags();
         if (!tags.isEmpty()) {
             result.append("tags:").append(tags).append("\n");
         }
         // parent(s)
         if (parentRevision != null) {
             result.append("parent: ").append(parentRevision);
             if (!getMergedRevisions().isEmpty()) {
                 result.append(" + ");
                 result.append(getMergedRevisions());
             }
             result.append("\n");
         }
         if (files != null) {
             for (ChangeFile file : files) {
                 result.append(file == null ? " null " : file.toString()).append("\n");
             }
         }
 
         result.append(comment == null ? " null " : comment);
 
         return result.toString();
     }
 
     /**
      * Provide the changelog entry as an XML snippet.
      *
      * @return a changelog-entry in xml format
      * TODO make sure comment doesn't contain CDATA tags - MAVEN114
      */
     public String toXML() {
         StringBuilder buffer = new StringBuilder("\t<changelog-entry>\n");
 
         if (getDate() != null) {
             buffer.append("\t\t<date pattern=\"" + DATE_PATTERN + "\">")
                     .append(getDateFormatted())
                     .append("</date>\n")
                     .append("\t\t<time pattern=\"" + TIME_PATTERN + "\">")
                     .append(getTimeFormatted())
                     .append("</time>\n");
         }
 
         buffer.append("\t\t<author><![CDATA[").append(author).append("]]></author>\n");
 
         if (parentRevision != null) {
             buffer.append("\t\t<parent>").append(getParentRevision()).append("</parent>\n");
         }
         for (String mergedRevision : getMergedRevisions()) {
             buffer.append("\t\t<merge>").append(mergedRevision).append("</merge>\n");
         }
 
         if (files != null) {
             for (ChangeFile file : files) {
                 buffer.append("\t\t<file>\n");
                 if (file.getAction() != null) {
                     buffer.append("\t\t\t<action>").append(file.getAction()).append("</action>\n");
                 }
                 buffer.append("\t\t\t<name>")
                         .append(escapeValue(file.getName()))
                         .append("</name>\n");
                 buffer.append("\t\t\t<revision>").append(file.getRevision()).append("</revision>\n");
                 if (file.getOriginalName() != null) {
                     buffer.append("\t\t\t<orig-name>");
                     buffer.append(escapeValue(file.getOriginalName()));
                     buffer.append("</orig-name>\n");
                 }
                 if (file.getOriginalRevision() != null) {
                     buffer.append("\t\t\t<orig-revision>");
                     buffer.append(file.getOriginalRevision());
                     buffer.append("</orig-revision>\n");
                 }
                 buffer.append("\t\t</file>\n");
             }
         }
         buffer.append("\t\t<msg><![CDATA[").append(removeCDataEnd(comment)).append("]]></msg>\n");
         List<String> tags = getTags();
         if (!tags.isEmpty()) {
             buffer.append("\t\t<tags>\n");
             for (String tag : tags) {
                 buffer.append("\t\t\t<tag>").append(escapeValue(tag)).append("</tag>\n");
             }
             buffer.append("\t\t</tags>\n");
         }
         buffer.append("\t</changelog-entry>\n");
 
         return buffer.toString();
     }
 
     /** {@inheritDoc} */
     public boolean equals(Object obj) {
         if (obj instanceof ChangeSet) {
             ChangeSet changeSet = (ChangeSet) obj;
 
             if (toString().equals(changeSet.toString())) {
                 return true;
             }
         }
 
         return false;
     }
 
     /** {@inheritDoc} */
     public int hashCode() {
         final int prime = 31;
         int result = 1;
         result = prime * result + ((author == null) ? 0 : author.hashCode());
         result = prime * result + ((comment == null) ? 0 : comment.hashCode());
         result = prime * result + ((date == null) ? 0 : date.hashCode());
         result = prime * result + ((parentRevision == null) ? 0 : parentRevision.hashCode());
         result = prime * result + ((mergedRevisions == null) ? 0 : mergedRevisions.hashCode());
         result = prime * result + ((files == null) ? 0 : files.hashCode());
         return result;
     }
 
     /**
      * remove a <code>]]></code> from comments (replace it with <code>] ] ></code>).
      *
      * @param message The message to modify
      * @return a clean string
      */
     private String removeCDataEnd(String message) {
         // check for invalid sequence ]]>
         int endCdata;
         while (message != null && (endCdata = message.indexOf("]]>")) > -1) {
             message = message.substring(0, endCdata) + "] ] >" + message.substring(endCdata + 3, message.length());
         }
         return message;
     }
 
     /**
      * <p>Escape the <code>toString</code> of the given object.
      * For use in an attribute value.</p>
      * <p>
      * swiped from jakarta-commons/betwixt -- XMLUtils.java
      *
      * @param value escape <code>value.toString()</code>
      * @return text with characters restricted (for use in attributes) escaped
      */
     public static String escapeValue(Object value) {
         StringBuilder buffer = new StringBuilder(value.toString());
         for (int i = 0, size = buffer.length(); i < size; i++) {
             switch (buffer.charAt(i)) {
                 case '<':
                     buffer.replace(i, i + 1, LESS_THAN_ENTITY);
                     size += 3;
                     i += 3;
                     break;
                 case '>':
                     buffer.replace(i, i + 1, GREATER_THAN_ENTITY);
                     size += 3;
                     i += 3;
                     break;
                 case '&':
                     buffer.replace(i, i + 1, AMPERSAND_ENTITY);
                     size += 4;
                     i += 4;
                     break;
                 case '\'':
                     buffer.replace(i, i + 1, APOSTROPHE_ENTITY);
                     size += 5;
                     i += 5;
                     break;
                 case '\"':
                     buffer.replace(i, i + 1, QUOTE_ENTITY);
                     size += 5;
                     i += 5;
                     break;
                 default:
             }
         }
         return buffer.toString();
     }
 }