/*
 * Week - represents one week of music listening
 */
class Week{

  int id;                // The iterative index of this week. id = 0 refers to the first week data was recorded
  long timeStamp;        // timestamp for this week
  int totalPlays;        // Total song plays during this week
  int maxPlays;          // Max plays of an artist during this week
  Vector artistRanking;  // List of artist references, sorted by ranking for this week
  Weeks parent;          // The weeks collection that contains this week

  Week(int id, long timeStamp, Weeks parent){
    this.id = id;
    this.timeStamp = timeStamp;
    this.parent = parent;
    totalPlays = 0;
    maxPlays = 0;
    
    artistRanking = new Vector();
  }
  
  int getID(){
    return id;
  }
  
  long getDate(){
    return timeStamp;
  }
  
  int getTotalPlays(){
    return totalPlays;
  }
  
  int getMaxPlays(){
    return maxPlays;
  }
  
  int getCount(){
    return artistRanking.size();
  }
  
  Artist getArtist(int rank){
    return (Artist) artistRanking.get(rank);
  }
  
  void addArtist(Artist a){
    artistRanking.add(a);
    parent.maxArtists = max(parent.maxArtists, artistRanking.size());
  }
   
  int getPlays(int rank){
    Artist a = this.getArtist(rank);
    return this.getPlays(a);
  }
  
  int getPlays(Artist a){
    return a.getPlays(this);
  }
  
  boolean isFirst(){
    return id==0;
  }
  
  boolean isLast(){
    return id==(parent.getCount()-1);
  }
  
  Week getPrev(){
    if(isFirst())
      return null;
    return parent.getWeek(id-1);
  }
  
  Week getNext(){
    if(isLast())
      return null;
    return parent.getWeek(id+1);
  }
  
}