import java.util.Optional;
import java.util.Set;

public class Person {

    private String firstName;

    private String lastName;

    private int age;

    private Gender sex;

    private Set<BonusCard> bonusCards;

    public enum Gender { MALE, FEMALE }

    public Person(String firstName, String lastName, int age, Gender gender) {
        if (age < 1)
            throw new IllegalArgumentException(); // TODO PersonException
        this.firstName = firstName;
        this.lastName = lastName;
        this.age = age;
        this.sex = gender;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public int getAge() {
        return age;
    }

    public Gender getGender() {
        return sex;
    }

    public Set<BonusCard> getBonusCards() {
        return bonusCards; // mb this will do if it's empty creating new empty set is not necessary
    }

    /**
     * Gets bonus card by the specified type.
     *
     * @param cardType the bonus card type
     * @return bonus card with the specified type
     */
    public Optional<BonusCard> getBonusCardByType(BonusCard.CardType cardType) {
        for (BonusCard bonusCard : bonusCards) {
            if (bonusCard.getType() == cardType)
                return Optional.of(bonusCard);
        }
        return Optional.empty();
    }

    public void addBonusCard(BonusCard bonusCard) {
        if (!bonusCards.contains(bonusCard))
            bonusCards.add(bonusCard);
    }

    public void removeBonusCard(BonusCard bonusCard) {
        if (bonusCards.contains(bonusCard))
            bonusCards.remove(bonusCard);
    }
}