/*
    * Licensed to The Apereo Foundation under one or more contributor license
    * agreements. See the NOTICE file distributed with this work for additional
    * information regarding copyright ownership.
    *
    *
    * The Apereo Foundation licenses this file to you under the Educational
    * Community 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://opensource.org/licenses/ecl2.txt
   *
   * 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.opencastproject.metadata.mpeg7;
  
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  import org.w3c.dom.Node;
  
  import java.util.Formatter;
  
  /**
   * TODO: Comment me!
   */
  public class MediaDurationImpl implements MediaDuration {
  
    /** Time delimiter */
    private static final String TimeDelimiter = "T";
  
    /** Day delimiter */
    private static final String DayDelimiter = "D";
  
    /** Hour delimiter */
    private static final String HourDelimiter = "H";
  
    /** Minute delimiter */
    private static final String MinuteDelimiter = "M";
  
    /** Seconds delimiter */
    private static final String SecondsDelimiter = "S";
  
    /** Fractions delimiter */
    private static final String FractionDelimiter = "N";
  
    /** Fractions per second delimiter */
    private static final String FPSDelimiter = "F";
  
    /** Number of milliseconds per day */
    private static final long MS_PER_DAY = 86400000L;
  
    /** Number of milliseconds per hour */
    private static final long MS_PER_HOUR = 3600000L;
  
    /** Number of milliseconds per minute */
    private static final long MS_PER_MINUTE = 60000L;
  
    /** Number of milliseconds per second */
    private static final long MS_PER_SECOND = 1000L;
  
    private int days = 0;
    private int hours = 0;
    private int minutes = 0;
    private int seconds = 0;
    private int fractions = 0;
    private int fractionsPerSecond = 0;
  
    /**
     * Creates a media duration representing <code>PD0T00H00M00S00N0F</code>.
     */
    public MediaDurationImpl() {
      days = 0;
      hours = 0;
      minutes = 0;
      seconds = 0;
      fractions = 0;
      fractionsPerSecond = 0;
    }
  
    /**
     * Creates a media duration representing the given long value.
     */
    public MediaDurationImpl(long milliseconds) {
      fractions = (int) (milliseconds % MS_PER_SECOND);
      seconds = (int) ((milliseconds / MS_PER_SECOND) % 60);
      minutes = (int) ((milliseconds / MS_PER_MINUTE) % 60);
      hours = (int) ((milliseconds / MS_PER_HOUR) % 24);
      days = (int) (milliseconds / MS_PER_DAY);
      hours += days * 24;
      fractionsPerSecond = 1000;
    }
 
   /**
    * Parses a duration text representation.
    *
    * @param text
    *          the duration text representation
    * @return the media duration object
    * @throws IllegalArgumentException
    *           if the text is not in the right format
    */
   public static MediaDuration parseDuration(String text) throws IllegalArgumentException {
     MediaDurationImpl mediaDuration = new MediaDurationImpl();
     mediaDuration.parse(text);
     return mediaDuration;
   }
 
   /**
    * Parses a duration text representation.
    *
    * @param text
    *          the duration text representation
    * @throws IllegalArgumentException
    *           if the text is not in the right format
    */
   public void parse(String text) throws IllegalArgumentException {
     int index = 0;
     if ((!text.startsWith("P")) || (!text.contains(TimeDelimiter)))
       throw new IllegalArgumentException();
     if (text.contains(DayDelimiter)) {
       days = Integer.parseInt(text.substring(1, text.indexOf(DayDelimiter)));
     }
     index = text.indexOf(TimeDelimiter);
     if (text.contains(HourDelimiter)) {
       hours = Short.parseShort(text.substring(index + 1, text.indexOf(HourDelimiter)));
       index = text.indexOf(HourDelimiter);
     }
     if (text.contains(MinuteDelimiter)) {
       minutes = Short.parseShort(text.substring(index + 1, text.indexOf(MinuteDelimiter)));
       index = text.indexOf(MinuteDelimiter);
     }
     if (text.contains(SecondsDelimiter)) {
       seconds = Short.parseShort(text.substring(index + 1, text.indexOf(SecondsDelimiter)));
       index = text.indexOf(SecondsDelimiter);
     }
     if (text.contains(FractionDelimiter)) {
       fractions = Integer.parseInt(text.substring(index + 1, text.indexOf(FractionDelimiter)));
       index = text.indexOf(FractionDelimiter);
     }
     if (text.contains(FPSDelimiter)) {
       fractionsPerSecond = Integer.parseInt(text.substring(index + 1, text.indexOf(FPSDelimiter)));
     }
   }
 
   /**
    * @see org.opencastproject.metadata.mpeg7.MediaDuration#getDays()
    */
   public int getDays() {
     return days;
   }
 
   /**
    * @see org.opencastproject.metadata.mpeg7.MediaDuration#getFractions()
    */
   public int getFractions() {
     return fractions;
   }
 
   /**
    * @see org.opencastproject.metadata.mpeg7.MediaDuration#getFractionsPerSecond()
    */
   public int getFractionsPerSecond() {
     return fractionsPerSecond;
   }
 
   /**
    * @see org.opencastproject.metadata.mpeg7.MediaDuration#getHours()
    */
   public int getHours() {
     return hours;
   }
 
   /**
    * @see org.opencastproject.metadata.mpeg7.MediaDuration#getMinutes()
    */
   public int getMinutes() {
     return minutes;
   }
 
   /**
    * @see org.opencastproject.metadata.mpeg7.MediaDuration#getSeconds()
    */
   public int getSeconds() {
     return seconds;
   }
 
   /**
    * Sets the number of days.
    *
    * @param days
    */
   public void setDayDuration(int days) {
     this.days = days;
   }
 
   /**
    * Sets the number of fractions.
    *
    * @param fractions
    *          the fractions
    */
   public void setFractionDuration(int fractions) {
     this.fractions = fractions;
   }
 
   /**
    * Sets the number of fractions per second.
    *
    * @param fractionsPerSecond
    *          the fractions per second
    */
   public void setFractionsPerSecond(int fractionsPerSecond) {
     this.fractionsPerSecond = fractionsPerSecond;
   }
 
   /**
    * Sets the number of hours.
    *
    * @param hours
    *          the hours
    */
   public void setHourDuration(short hours) {
     this.hours = hours;
   }
 
   /**
    * Sets the number of minutes.
    *
    * @param minutes
    *          the number of minutes
    */
   public void setMinuteDuration(short minutes) {
     this.minutes = minutes;
   }
 
   /**
    * Sets the number of seconds.
    *
    * @param seconds
    *          the number of seconds
    */
   public void setSecondDuration(short seconds) {
     this.seconds = seconds;
   }
 
   /**
    * @see java.lang.Object#toString()
    */
   @Override
   public String toString() {
     StringBuffer returnString = new StringBuffer("PT");
     Formatter f = new Formatter(returnString);
     if (hours != 0) {
       f.format("%02d" + HourDelimiter, hours);
     }
     if (minutes != 0) {
       f.format("%02d" + MinuteDelimiter, minutes);
     }
     if (seconds != 0) {
       f.format("%02d" + SecondsDelimiter, seconds);
     }
     if (fractionsPerSecond != 0) {
       f.format("%d" + FractionDelimiter + "%d" + FPSDelimiter, fractions, fractionsPerSecond);
     }
     f.close();
     return returnString.toString();
   }
 
   /**
    * @see org.opencastproject.metadata.mpeg7.MediaDuration#getDurationInMilliseconds()
    */
   public long getDurationInMilliseconds() {
     long s = seconds * MS_PER_SECOND;
     s += minutes * MS_PER_MINUTE;
     s += hours * MS_PER_HOUR;
     s += days * MS_PER_DAY;
     if (fractionsPerSecond > 0)
       s += (fractions * 1000L / fractionsPerSecond);
     return s;
   }
 
   /**
    * {@inheritDoc}
    *
    * @see java.lang.Object#hashCode()
    */
   @Override
   public int hashCode() {
     return super.hashCode();
   }
 
   /**
    * {@inheritDoc}
    *
    * @see java.lang.Object#equals(java.lang.Object)
    */
   @Override
   public boolean equals(Object obj) {
     if (obj instanceof MediaDuration)
       return ((MediaDuration) obj).getDurationInMilliseconds() == getDurationInMilliseconds();
     return false;
   }
 
   /**
    * @see org.opencastproject.mediapackage.XmlElement#toXml(org.w3c.dom.Document)
    */
   public Node toXml(Document document) {
     Element node = document.createElement("MediaDuration");
     node.setTextContent(toString());
     return node;
   }
 
 }