/*
 * Copyright 2010-2013 Ning, Inc.
 * Copyright 2014-2015 Groupon, Inc
 * Copyright 2014-2015 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.bus;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import org.killbill.billing.ErrorCode;
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.InternalCallContext;
import org.killbill.billing.events.InvoiceCreationInternalEvent;
import org.killbill.billing.events.PaymentInternalEvent;
import org.killbill.billing.invoice.api.Invoice;
import org.killbill.billing.invoice.api.InvoiceApiException;
import org.killbill.billing.invoice.api.InvoiceInternalApi;
import org.killbill.billing.invoice.api.InvoiceStatus;
import org.killbill.billing.payment.api.PaymentApiException;
import org.killbill.billing.payment.api.PluginProperty;
import org.killbill.billing.payment.core.PluginControlPaymentProcessor;
import org.killbill.billing.payment.core.janitor.Janitor;
import org.killbill.billing.payment.invoice.InvoicePaymentControlPluginApi;
import org.killbill.billing.util.UUIDs;
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.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.eventbus.AllowConcurrentEvents;
import com.google.common.eventbus.Subscribe;
import com.google.inject.Inject;

public class PaymentBusEventHandler {

    private static final Logger log = LoggerFactory.getLogger(PaymentBusEventHandler.class);

    private final AccountInternalApi accountApi;
    private final InvoiceInternalApi invoiceApi;
    private final InternalCallContextFactory internalCallContextFactory;
    private final PluginControlPaymentProcessor pluginControlPaymentProcessor;
    private final PaymentConfig paymentConfig;
    private final Janitor janitor;

    @Inject
    public PaymentBusEventHandler(final PaymentConfig paymentConfig,
                                  final AccountInternalApi accountApi,
                                  final InvoiceInternalApi invoiceApi,
                                  final PluginControlPaymentProcessor pluginControlPaymentProcessor,
                                  final Janitor janitor,
                                  final InternalCallContextFactory internalCallContextFactory) {
        this.paymentConfig = paymentConfig;
        this.accountApi = accountApi;
        this.invoiceApi = invoiceApi;
        this.janitor = janitor;
        this.internalCallContextFactory = internalCallContextFactory;
        this.pluginControlPaymentProcessor = pluginControlPaymentProcessor;
    }

    @AllowConcurrentEvents
    @Subscribe
    public void processPaymentEvent(final PaymentInternalEvent event) {
        janitor.processPaymentEvent(event);
    }

    @AllowConcurrentEvents
    @Subscribe
    public void processInvoiceEvent(final InvoiceCreationInternalEvent event) {
        log.info("Received invoice creation notification for account {} and invoice {}",
                 event.getAccountId(), event.getInvoiceId());


        final Account account;
        try {
            final InternalCallContext internalContext = internalCallContextFactory.createInternalCallContext(event.getSearchKey2(), event.getSearchKey1(), "PaymentRequestProcessor", CallOrigin.INTERNAL, UserType.SYSTEM, event.getUserToken());
            final Invoice invoice = invoiceApi.getInvoiceById(event.getInvoiceId(), internalContext);
            if (!InvoiceStatus.COMMITTED.equals(invoice.getStatus())) {
                log.info("Ignoring payment for non COMMITTED invoice " + event.getInvoiceId());
                return;
            }

            account = accountApi.getAccountById(event.getAccountId(), internalContext);

            final List<PluginProperty> properties = new ArrayList<PluginProperty>();
            final PluginProperty prop1 = new PluginProperty(InvoicePaymentControlPluginApi.PROP_IPCD_INVOICE_ID, event.getInvoiceId().toString(), false);
            properties.add(prop1);

            final CallContext callContext = internalCallContextFactory.createCallContext(internalContext);

            final BigDecimal amountToBePaid = null; // We let the plugin compute how much should be paid
            final List<String> paymentControlPluginNames = paymentConfig.getPaymentControlPluginNames() != null ? new LinkedList<String>(paymentConfig.getPaymentControlPluginNames()) : new LinkedList<String>();
            paymentControlPluginNames.add(InvoicePaymentControlPluginApi.PLUGIN_NAME);
            pluginControlPaymentProcessor.createPurchase(false, account, account.getPaymentMethodId(), null, amountToBePaid, account.getCurrency(), UUIDs.randomUUID().toString(), UUIDs.randomUUID().toString(),
                                                         properties, paymentControlPluginNames, callContext, internalContext);
        } catch (final AccountApiException e) {
            log.error("Failed to process invoice payment", e);
        } catch (InvoiceApiException e) {
            log.error("Failed to process invoice payment", e);
        } catch (final PaymentApiException e) {
            // Log as error unless:
            if (e.getCode() != ErrorCode.PAYMENT_NULL_INVOICE.getCode() /* Nothing left to be paid */ &&
                e.getCode() != ErrorCode.PAYMENT_CREATE_PAYMENT.getCode() /* User payment error */) {
                log.error("Failed to process invoice payment {}", e.toString());
            }
        }
    }
}


