/*
 * Copyright 2014 Groupon, Inc
 * Copyright 2014 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.janitor;

import java.util.List;
import java.util.UUID;

import org.killbill.billing.ObjectType;
import org.killbill.billing.account.api.Account;
import org.killbill.billing.account.api.AccountApiException;
import org.killbill.billing.account.api.AccountInternalApi;
import org.killbill.billing.callcontext.DefaultCallContext;
import org.killbill.billing.callcontext.InternalCallContext;
import org.killbill.billing.callcontext.InternalTenantContext;
import org.killbill.billing.payment.api.PaymentApiException;
import org.killbill.billing.payment.api.TransactionStatus;
import org.killbill.billing.payment.core.sm.PluginControlledPaymentAutomatonRunner;
import org.killbill.billing.payment.core.sm.RetryStateMachineHelper;
import org.killbill.billing.payment.core.sm.RetryablePaymentStateContext;
import org.killbill.billing.payment.dao.PaymentAttemptModelDao;
import org.killbill.billing.payment.dao.PaymentDao;
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.cache.Cachable.CacheType;
import org.killbill.billing.util.cache.CacheControllerDispatcher;
import org.killbill.billing.util.callcontext.CallContext;
import org.killbill.billing.util.callcontext.CallOrigin;
import org.killbill.billing.util.callcontext.InternalCallContextFactory;
import org.killbill.billing.util.callcontext.UserType;
import org.killbill.billing.util.config.PaymentConfig;
import org.killbill.billing.util.dao.NonEntityDao;
import org.killbill.clock.Clock;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;

/**
 * Task to complete 'partially' incomplete payment attempts. Tis only matters for calls that went through PaymentControl apis.
 * <p/>
 * If the state of the transaction associated with the attempt completed, but the attempt state machine did not,
 * we rerun the retry state machine to complete the call and transition the attempt into a terminal state.
 */
final class AttemptCompletionTask extends CompletionTaskBase<PaymentAttemptModelDao> {


    public AttemptCompletionTask(final Janitor janitor, final InternalCallContextFactory internalCallContextFactory, final PaymentConfig paymentConfig,
                                 final NonEntityDao nonEntityDao, final PaymentDao paymentDao, final Clock clock,
                                 final RetryStateMachineHelper retrySMHelper, final CacheControllerDispatcher controllerDispatcher, final AccountInternalApi accountInternalApi,
                                 final PluginControlledPaymentAutomatonRunner pluginControlledPaymentAutomatonRunner) {
        super(janitor, internalCallContextFactory, paymentConfig, nonEntityDao, paymentDao, clock, retrySMHelper, controllerDispatcher, accountInternalApi, pluginControlledPaymentAutomatonRunner);
    }

    @Override
    public List<PaymentAttemptModelDao> getItemsForIteration() {
        final List<PaymentAttemptModelDao> incompleteAttempts = paymentDao.getPaymentAttemptsByState(retrySMHelper.getInitialState().getName(), getCreatedDateBefore(), fakeCallContext);
        log.info("Janitor AttemptCompletionTask start run : found " + incompleteAttempts.size() + " incomplete attempts");
        return incompleteAttempts;
    }

    @Override
    public void doIteration(final PaymentAttemptModelDao attempt) {
        // STEPH seems a bit insane??
        final InternalTenantContext tenantContext = internalCallContextFactory.createInternalTenantContext(attempt.getAccountId(), attempt.getId(), ObjectType.PAYMENT_ATTEMPT);
        final UUID tenantId = nonEntityDao.retrieveIdFromObject(tenantContext.getTenantRecordId(), ObjectType.TENANT, controllerDispatcher.getCacheController(CacheType.OBJECT_ID));
        final CallContext callContext = new DefaultCallContext(tenantId, "AttemptCompletionJanitorTask", CallOrigin.INTERNAL, UserType.SYSTEM, UUID.randomUUID(), clock);
        final InternalCallContext internalCallContext = internalCallContextFactory.createInternalCallContext(attempt.getAccountId(), callContext);

        final List<PaymentTransactionModelDao> transactions = paymentDao.getPaymentTransactionsByExternalKey(attempt.getTransactionExternalKey(), tenantContext);
        final PaymentTransactionModelDao transaction = Iterables.tryFind(transactions, new Predicate<PaymentTransactionModelDao>() {
            @Override
            public boolean apply(final PaymentTransactionModelDao input) {
                return input.getAttemptId().equals(attempt.getId()) &&
                       input.getTransactionStatus() == TransactionStatus.SUCCESS;
            }
        }).orNull();

        if (transaction == null) {
            log.info("Janitor AttemptCompletionTask moving attempt " + attempt.getId() + " -> ABORTED");
            paymentDao.updatePaymentAttempt(attempt.getId(), attempt.getTransactionId(), "ABORTED", internalCallContext);
            return;
        }

        try {
            log.info("Janitor AttemptCompletionTask completing attempt " + attempt.getId() + " -> SUCCESS");

            final Account account = accountInternalApi.getAccountById(attempt.getAccountId(), tenantContext);
            final boolean isApiPayment = true; // unclear
            final RetryablePaymentStateContext paymentStateContext = new RetryablePaymentStateContext(attempt.getPluginName(),
                                                                                                      isApiPayment,
                                                                                                      transaction.getPaymentId(),
                                                                                                      attempt.getPaymentExternalKey(),
                                                                                                      transaction.getTransactionExternalKey(),
                                                                                                      transaction.getTransactionType(),
                                                                                                      account,
                                                                                                      attempt.getPaymentMethodId(),
                                                                                                      transaction.getAmount(),
                                                                                                      transaction.getCurrency(),
                                                                                                      PluginPropertySerializer.deserialize(attempt.getPluginProperties()),
                                                                                                      internalCallContext,
                                                                                                      callContext);

            paymentStateContext.setAttemptId(attempt.getId()); // Normally set by leavingState Callback
            paymentStateContext.setPaymentTransactionModelDao(transaction); // Normally set by raw state machine
            //
            // Will rerun the state machine with special callbacks to only make the onCompletion call
            // to the PaymentControlPluginApi plugin and transition the state.
            //
            pluginControlledPaymentAutomatonRunner.completeRun(paymentStateContext);
        } catch (AccountApiException e) {
            log.warn("Janitor AttemptCompletionTask failed to complete payment attempt " + attempt.getId(), e);
        } catch (PluginPropertySerializerException e) {
            log.warn("Janitor AttemptCompletionTask failed to complete payment attempt " + attempt.getId(), e);
        } catch (PaymentApiException e) {
            log.warn("Janitor AttemptCompletionTask failed to complete payment attempt " + attempt.getId(), e);
        }
    }
}
