import java.util.*;
public class Floor {
	private int id;
	private ArrayList<Person> peopleWaiting;
	
	public Floor(int id) {
		this.id = id;
		peopleWaiting = new ArrayList<Person>();
	}
	
	public int getId() {
		return id;
	}

	/**
	 * This method adds a person to the list of people waiting in front of the elevators.
	 * 
	 * @param person the person approaching the elevators
	 */
	public void joinPeopleWaiting(Person person) {
		peopleWaiting.add(person);
	}	
	
	/**
	 * This method clears the list of people waiting in front of the elevators.
	 * It is called when an elevator arrives to pick people up.
	 *
	 * @return the list of people waiting in front of the elevators
	 */
	public ArrayList<Person> removePeopleWaiting() {
		ArrayList<Person> tmp = new ArrayList<Person>();
		tmp.addAll(peopleWaiting);
		peopleWaiting.clear();
		return tmp;
	}
	
	/**
	 * This method checks if there are people waiting in front of the elevators.
	 *
	 * @return true if there are people on this floor waiting at the elevators, false otherwise
	 */
	public boolean hasPeopleWaiting() {
		if (!peopleWaiting.isEmpty()) {
			return true;
		} else {
			return false;
		}
	}
}