package instructor;

import java.util.Collection;

enum WeekDay {Monday, Tuesday, Wednesday, Thursday, Friday}


/**
* This class contains the objects necessary for Instructor Time Preferences
* @author celind
*/
abstract class TimePreferences {
   public Instructor instructor;
   public Collection<TimeBlock> timeAvailability;
   public String quickAdd;
   
   
   /**
     * Adds TimeBlock to temporary editing time preferences
     */
    /*@
     requires
     	// 
     	// The given TimeBlock is valid
     	//
     	(timeBlock != null && timeBlock.isValid());

     ensures
     	//
     	// The given TimeBlock is inputted into the timeAvailability
     	//
     	(\forall TimeBlock tb;
     		timeAvailability.contains(tb));     
     @*/
   public abstract TimeBlock add(TimeBlock timeBlock);
   
   
    /**
     * Adds TimeBlock to timeAvailability
     */
    /*@
     requires
     	// 
     	// The given TimeBlock is valid and is in timeAvailability
     	//
     	(timeBlock != null && timeBlock.isValid() && timeAvailability.contains(timeBlock));
     
     ensures
     	//
     	// The given TimeBlock is inputted into timeAvailability
     	//    and is updated to the new TimeBlock
     	//
     	(\forall TimeBlock tb;
     		timeAvailability.contains(tb));     
     @*/
   public abstract TimeBlock update(TimeBlock timeBlock);
   
   
    /**
     * Removes the specified TimeBlock from the temporary editing time preferences
     */
    /*@
    requires
     	// 
     	// The given TimeBlock is valid and is in timeAvailability
     	//
     	(timeBlock != null && timeBlock.isValid() && timeAvailability.contains(timeBlock));
      
     ensures
     	//
     	// The given TimeBlock is removed from timeAvailability
     	//
     	(timeAvailability.contains(timeBlock) == false);
     @*/
   public abstract TimeBlock delete(TimeBlock timeBlock);
   
   
   /** 
    * Saves time preferences to database, redirects to Course Preferences
    */
   /*@
   requires
   // 
   // The inputted data from the user is valid
   //
   (\forall TimeBlock tb;
     		timeAvailability.contains(tb));
   
   ensures
   //
   // The given time preferences are saved to database.
   //
   (\forall TimeBlock tb;
     		timeAvailability.contains(tb));     
   @*/
   public abstract void next();
}