/*
 * Copyright 2014 Groupon, Inc
 * Copyright 2014 The Billing Project, LLC
 *
 * Groupon licenses this file to you under the Apache License, version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package org.killbill.billing.payment.core.sm;

import org.killbill.automaton.OperationException;
import org.killbill.automaton.State;
import org.killbill.automaton.State.LeavingStateCallback;
import org.killbill.billing.ErrorCode;
import org.killbill.billing.payment.api.PaymentApiException;
import org.killbill.billing.payment.dao.PaymentTransactionModelDao;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class PaymentLeavingStateCallback implements LeavingStateCallback {

    private final Logger logger = LoggerFactory.getLogger(PaymentLeavingStateCallback.class);

    protected final PaymentAutomatonDAOHelper daoHelper;
    protected final PaymentStateContext paymentStateContext;

    protected PaymentLeavingStateCallback(final PaymentAutomatonDAOHelper daoHelper, final PaymentStateContext paymentStateContext) throws PaymentApiException {
        this.daoHelper = daoHelper;
        this.paymentStateContext = paymentStateContext;
    }

    @Override
    public void leavingState(final State oldState) throws OperationException {
        logger.debug("Leaving state {}", oldState.getName());

        // Create or update the payment and transaction
        try {
            // No paymentMethodId was passed through API and account does not have a default paymentMethodId
            if (paymentStateContext.getPaymentMethodId() == null) {
                throw new PaymentApiException(ErrorCode.PAYMENT_NO_DEFAULT_PAYMENT_METHOD, paymentStateContext.getAccount().getId());
            }

            // If the transactionId has been specified, it means this is an operation in several stage (INIT -> PENDING -> XXX), so we don't need to create the row,
            // but we do need to set the transactionModelDao in the context so enteringState logic can take place.
            if (paymentStateContext.getTransactionId() == null) {
                daoHelper.createNewPaymentTransaction();
            } else {
                final PaymentTransactionModelDao transactionModelDao =  daoHelper.paymentDao.getPaymentTransaction(paymentStateContext.getTransactionId(), paymentStateContext.getInternalCallContext());
                paymentStateContext.setPaymentTransactionModelDao(transactionModelDao);
            }
        } catch (PaymentApiException e) {
            throw new OperationException(e);
        }
    }
}
