/*
 * Copyright 2014-2016 Groupon, Inc
 * Copyright 2014-2016 The Billing Project, LLC
 *
 * The Billing Project 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.control;

import org.joda.time.DateTime;
import org.killbill.automaton.OperationException;
import org.killbill.automaton.State;
import org.killbill.automaton.State.LeavingStateCallback;
import org.killbill.billing.payment.api.PluginProperty;
import org.killbill.billing.payment.api.TransactionType;
import org.killbill.billing.payment.core.sm.PaymentStateContext;
import org.killbill.billing.payment.core.sm.PluginControlPaymentAutomatonRunner;
import org.killbill.billing.payment.dao.PaymentAttemptModelDao;
import org.killbill.billing.payment.dao.PaymentDao;
import org.killbill.billing.payment.dao.PaymentModelDao;
import org.killbill.billing.payment.dao.PaymentTransactionModelDao;
import org.killbill.billing.payment.dao.PluginPropertySerializer;
import org.killbill.billing.payment.dao.PluginPropertySerializer.PluginPropertySerializerException;
import org.killbill.billing.util.UUIDs;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;

public class DefaultControlInitiated implements LeavingStateCallback {

    private final PluginControlPaymentAutomatonRunner pluginControlPaymentAutomatonRunner;
    private final PaymentStateControlContext stateContext;
    private final State initialState;
    private final State retriedState;
    private final TransactionType transactionType;
    private final PaymentDao paymentDao;

    public DefaultControlInitiated(final PluginControlPaymentAutomatonRunner pluginControlPaymentAutomatonRunner, final PaymentStateContext stateContext, final PaymentDao paymentDao,
                                   final State initialState, final State retriedState, final TransactionType transactionType) {
        this.pluginControlPaymentAutomatonRunner = pluginControlPaymentAutomatonRunner;
        this.paymentDao = paymentDao;
        this.initialState = initialState;
        this.retriedState = retriedState;
        this.stateContext = (PaymentStateControlContext) stateContext;
        this.transactionType = transactionType;
    }

    @Override
    public void leavingState(final State state) throws OperationException {
        final DateTime utcNow = pluginControlPaymentAutomatonRunner.getClock().getUTCNow();

        if (stateContext.getPaymentId() != null && stateContext.getPaymentExternalKey() == null) {
            final PaymentModelDao payment = paymentDao.getPayment(stateContext.getPaymentId(), stateContext.getInternalCallContext());
            Preconditions.checkNotNull(payment, "payment cannot be null for id " + stateContext.getPaymentId());
            stateContext.setPaymentExternalKey(payment.getExternalKey());
            stateContext.setPaymentMethodId(payment.getPaymentMethodId());
        } else if (stateContext.getPaymentExternalKey() == null) {
            stateContext.setPaymentExternalKey(UUIDs.randomUUID().toString());
        }
        if (stateContext.getTransactionId() != null && stateContext.getPaymentTransactionExternalKey() == null) {
            final PaymentTransactionModelDao paymentTransactionModelDao = paymentDao.getPaymentTransaction(stateContext.getTransactionId(), stateContext.getInternalCallContext());
            Preconditions.checkNotNull(paymentTransactionModelDao, "paymentTransaction cannot be null for id " + stateContext.getTransactionId());
            stateContext.setPaymentTransactionExternalKey(paymentTransactionModelDao.getTransactionExternalKey());
        } else if (stateContext.getPaymentTransactionExternalKey() == null) {
            stateContext.setPaymentTransactionExternalKey(UUIDs.randomUUID().toString());
        }

        if (stateContext.getPaymentMethodId() == null) {
            // Similar logic in PaymentAutomatonRunner
            stateContext.setPaymentMethodId(stateContext.getAccount().getPaymentMethodId());
        }

        if (state.getName().equals(initialState.getName()) || state.getName().equals(retriedState.getName())) {
            try {
                //
                // We don't serialize any properties at this stage to avoid serializing sensitive information.
                // However, if after going through the control plugins, the attempt end up in RETRIED state,
                // the properties will be serialized in the enteringState callback (any plugin that sets a
                // retried date is responsible to correctly remove sensitive information such as CVV, ...)
                //
                final byte[] serializedProperties = PluginPropertySerializer.serialize(ImmutableList.<PluginProperty>of());
                final PaymentAttemptModelDao attempt = new PaymentAttemptModelDao(stateContext.getAccount().getId(), stateContext.getPaymentMethodId(),
                                                                                  utcNow, utcNow, stateContext.getPaymentExternalKey(), stateContext.getTransactionId(),
                                                                                  stateContext.getPaymentTransactionExternalKey(), transactionType, initialState.getName(),
                                                                                  stateContext.getAmount(), stateContext.getCurrency(),
                                                                                  stateContext.getPaymentControlPluginNames(), serializedProperties);

                pluginControlPaymentAutomatonRunner.getPaymentDao().insertPaymentAttemptWithProperties(attempt, stateContext.getInternalCallContext());

                stateContext.setAttemptId(attempt.getId());
            } catch (final PluginPropertySerializerException e) {
                throw new OperationException(e);
            }
        }
    }
}
