package org.craftedsw.tripservicekata.trip;

import java.util.ArrayList;
import java.util.List;

import org.craftedsw.tripservicekata.exception.UserNotLoggedInException;
import org.craftedsw.tripservicekata.user.User;
import org.craftedsw.tripservicekata.user.UserSession;

public class TripService {

	public List<Trip> getTripsByUser(User user) throws UserNotLoggedInException {
		throwUserNotLoggedInException(getLoggedUserFromSession());

		return isFriend(user, getLoggedUserFromSession()) ?
					findTripsByUser(user) :
					emptyTrip();
	}

	protected void throwUserNotLoggedInException(User loggedUser) {
		if (loggedUser == null) {
			throw new UserNotLoggedInException();
		}
	}

	private ArrayList<Trip> emptyTrip() {
		return new ArrayList<Trip>();
	}


	private boolean isFriend(User user, User loggedUser) {
		for (User friend : user.getFriends()) {
            if (friend.equals(loggedUser)) {
				return true;
            }
        }
		return false;
	}

	protected List<Trip> findTripsByUser(User user) {
		return TripDAO.findTripsByUser(user);
	}

	protected User getLoggedUserFromSession() {
		return UserSession.getInstance().getLoggedUser();
	}


}