package hu.unr.fiber.cardapi.hibernate;

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

import hu.unr.fiber.cardapi.interfaces.CardInteractorInterface;
import hu.unr.fiber.cardapi.interfaces.CardInterface;
import hu.unr.fiber.cardapi.rest.RestCard;
import org.springframework.orm.jpa.JpaObjectRetrievalFailureException;
import org.springframework.stereotype.Component;

@Component
public class CardInteractor implements CardInteractorInterface {

    private CardRepository cardRepository;

    CardInteractor(CardRepository cardRepository) {
        this.cardRepository = cardRepository;
    }

    @Override
    public List<CardInterface> getCardList() {

        List<Card> cardList = this.cardRepository.findAll();
        List<CardInterface> restCardList = new ArrayList<>();

        for (Card card : cardList) {
            RestCard ce = new RestCard(card.getId());
            restCardList.add(ce.update(card));
        }

        return restCardList;
    }

    @Override
    public CardInterface getCardById(long id) throws CardNotFoundException {
        if (!this.cardRepository.existsById(id)) {
            throw new CardNotFoundException("No such card with id: #"+ id);
        }

        Card c = this.cardRepository.getOne(id);
        RestCard ce = new RestCard(c.getId());

        return ce.update(c);
    }

    @Override
    public void delete(long id) throws CardNotFoundException {
        try {
            Card c = this.cardRepository.getOne(id);
            this.cardRepository.delete(c);
            this.cardRepository.flush();
        } catch (JpaObjectRetrievalFailureException e) {
            throw new CardNotFoundException(e.getMessage());
        }
    }

    @Override
    public CardInterface update(long id, CardInterface updatedCard) throws CardInvalidUpdateException, CardNotFoundException {
        if (updatedCard.validId() && (updatedCard.getId() != id)) {
            throw new CardInvalidUpdateException("Card ID cannot be changed! ", updatedCard);
        }

        if (this.getCardByNumber(updatedCard.getNumber()) != null) {
            throw new CardInvalidUpdateException("Given card number already exists", updatedCard);
        }

        this.cardRepository.saveAndFlush((Card) updatedCard);

        return this.getCardById(updatedCard.getId());
    }

    private Card getCardByNumber(String number) {

        Long id = cardRepository.findIdByNumber(number);

        if (id == null) {
            return null;
        }

        return this.cardRepository.getOne(id);
    }
}