/*
 * 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.invoice.api.svcs;

import java.math.BigDecimal;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import javax.inject.Inject;

import org.joda.time.DateTime;
import org.joda.time.LocalDate;
import org.killbill.billing.ErrorCode;
import org.killbill.billing.callcontext.InternalCallContext;
import org.killbill.billing.callcontext.InternalTenantContext;
import org.killbill.billing.catalog.api.Currency;
import org.killbill.billing.invoice.api.Invoice;
import org.killbill.billing.invoice.api.InvoiceApiException;
import org.killbill.billing.invoice.api.InvoiceApiHelper;
import org.killbill.billing.invoice.api.InvoiceInternalApi;
import org.killbill.billing.invoice.api.InvoiceItem;
import org.killbill.billing.invoice.api.InvoicePayment;
import org.killbill.billing.invoice.api.InvoicePaymentType;
import org.killbill.billing.invoice.api.InvoiceStatus;
import org.killbill.billing.invoice.api.WithAccountLock;
import org.killbill.billing.invoice.dao.InvoiceDao;
import org.killbill.billing.invoice.dao.InvoiceModelDao;
import org.killbill.billing.invoice.dao.InvoicePaymentModelDao;
import org.killbill.billing.invoice.model.DefaultInvoice;
import org.killbill.billing.invoice.model.DefaultInvoicePayment;
import org.killbill.billing.util.callcontext.CallContext;
import org.killbill.billing.util.callcontext.InternalCallContextFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Collections2;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;

public class DefaultInvoiceInternalApi implements InvoiceInternalApi {

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

    private final InvoiceDao dao;
    private final InvoiceApiHelper invoiceApiHelper;
    private final InternalCallContextFactory internalCallContextFactory;

    @Inject
    public DefaultInvoiceInternalApi(final InvoiceDao dao,
                                     final InvoiceApiHelper invoiceApiHelper,
                                     final InternalCallContextFactory internalCallContextFactory) {
        this.dao = dao;
        this.invoiceApiHelper = invoiceApiHelper;
        this.internalCallContextFactory = internalCallContextFactory;
    }

    @Override
    public Invoice getInvoiceById(final UUID invoiceId, final InternalTenantContext context) throws InvoiceApiException {
        return new DefaultInvoice(dao.getById(invoiceId, context));
    }

    @Override
    public Collection<Invoice> getUnpaidInvoicesByAccountId(final UUID accountId, final LocalDate upToDate, final InternalTenantContext context) {
        return Collections2.transform(dao.getUnpaidInvoicesByAccountId(accountId, upToDate, context), new Function<InvoiceModelDao, Invoice>() {
            @Override
            public Invoice apply(final InvoiceModelDao input) {
                return new DefaultInvoice(input);
            }
        });
    }

    @Override
    public BigDecimal getAccountBalance(final UUID accountId, final InternalTenantContext context) {
        return dao.getAccountBalance(accountId, context);
    }

    @Override
    public void recordPaymentAttemptInit(final UUID invoiceId, final BigDecimal amount, final Currency currency, final Currency processedCurrency, final UUID paymentId, final String transactionExternalKey, final DateTime paymentDate, final InternalCallContext context) throws InvoiceApiException {
        final InvoicePayment invoicePayment = new DefaultInvoicePayment(InvoicePaymentType.ATTEMPT, paymentId, invoiceId, paymentDate, amount, currency, processedCurrency, transactionExternalKey, false);
        dao.notifyOfPaymentInit(new InvoicePaymentModelDao(invoicePayment), context);
    }


    @Override
    public void recordPaymentAttemptCompletion(final UUID invoiceId, final BigDecimal amount, final Currency currency, final Currency processedCurrency, final UUID paymentId, final String transactionExternalKey, final DateTime paymentDate, final boolean success, final InternalCallContext context) throws InvoiceApiException {
        final InvoicePayment invoicePayment = new DefaultInvoicePayment(InvoicePaymentType.ATTEMPT, paymentId, invoiceId, paymentDate, amount, currency, processedCurrency, transactionExternalKey, success);
        dao.notifyOfPaymentCompletion(new InvoicePaymentModelDao(invoicePayment), context);
    }

    @Override
    public InvoicePayment getInvoicePaymentForAttempt(final UUID paymentId, final InternalTenantContext context) throws InvoiceApiException {
        return getInvoicePayment(paymentId, InvoicePaymentType.ATTEMPT, context);
    }

    @Override
    public InvoicePayment getInvoicePaymentForChargeback(final UUID paymentId, final InternalTenantContext context) throws InvoiceApiException {
        return getInvoicePayment(paymentId, InvoicePaymentType.CHARGED_BACK, context);
    }

    @Override
    public Invoice getInvoiceForPaymentId(final UUID paymentId, final InternalTenantContext context) throws InvoiceApiException {
        final UUID invoiceIdStr = dao.getInvoiceIdByPaymentId(paymentId, context);
        return invoiceIdStr == null ? null : new DefaultInvoice(dao.getById(invoiceIdStr, context));
    }

    @Override
    public InvoicePayment recordRefund(final UUID paymentId, final BigDecimal amount, final boolean isInvoiceAdjusted, final Map<UUID, BigDecimal> invoiceItemIdsWithAmounts, final String transactionExternalKey, final InternalCallContext context) throws InvoiceApiException {
        if (amount.compareTo(BigDecimal.ZERO) <= 0) {
            throw new InvoiceApiException(ErrorCode.PAYMENT_REFUND_AMOUNT_NEGATIVE_OR_NULL, paymentId, amount);
        }

        final InvoicePaymentModelDao refund = dao.createRefund(paymentId, amount, isInvoiceAdjusted, invoiceItemIdsWithAmounts, transactionExternalKey, context);

        // See https://github.com/killbill/killbill/issues/265
        final CallContext callContext = internalCallContextFactory.createCallContext(context);
        final Invoice invoice = getInvoiceById(refund.getInvoiceId(), context);
        final UUID accountId = invoice.getAccountId();
        final WithAccountLock withAccountLock = new WithAccountLock() {
            @Override
            public Iterable<Invoice> prepareInvoices() throws InvoiceApiException {
                return ImmutableList.<Invoice>of(invoice);
            }
        };
        final List<InvoiceItem> createdInvoiceItems = invoiceApiHelper.dispatchToInvoicePluginsAndInsertItems(accountId, false, withAccountLock, callContext);

        return new DefaultInvoicePayment(refund);
    }

    @Override
    public InvoicePayment recordChargeback(final UUID paymentId, final BigDecimal amount, final Currency currency, final InternalCallContext context) throws InvoiceApiException {
        return new DefaultInvoicePayment(dao.postChargeback(paymentId, amount, currency, context));
    }

    @Override
    public void consumeExistingCBAOnAccountWithUnpaidInvoices(final UUID accountId, final InternalCallContext context) throws InvoiceApiException {
        dao.consumeExstingCBAOnAccountWithUnpaidInvoices(accountId, context);
    }

    @Override
    public Map<UUID, BigDecimal> validateInvoiceItemAdjustments(final UUID paymentId, final Map<UUID, BigDecimal> idWithAmount, final InternalTenantContext context) throws InvoiceApiException {
        // We want to validate that only refund with invoice *item* adjustments are allowed (as opposed to refund with invoice adjustment)
        if (idWithAmount.size() == 0) {
            throw new InvoiceApiException(ErrorCode.INVOICE_ITEMS_ADJUSTMENT_MISSING);
        }
        final InvoicePayment invoicePayment = getInvoicePayment(paymentId, InvoicePaymentType.ATTEMPT, context);
        return dao.computeItemAdjustments(invoicePayment.getInvoiceId().toString(), idWithAmount, context);
    }

    private InvoicePayment getInvoicePayment(final UUID paymentId, final InvoicePaymentType type, final InternalTenantContext context) throws InvoiceApiException {

        final List<InvoicePaymentModelDao> invoicePayments = dao.getInvoicePaymentsByPaymentId(paymentId, context);
        final InvoicePaymentModelDao resultOrNull = Iterables.tryFind(invoicePayments, new Predicate<InvoicePaymentModelDao>() {
            @Override
            public boolean apply(final InvoicePaymentModelDao input) {
                return input.getType() == type &&
                        input.getSuccess();
            }
        }).orNull();
        return resultOrNull != null ? new DefaultInvoicePayment(resultOrNull) : null;
    }

    @Override
    public void commitInvoice(final UUID invoiceId, final InternalCallContext context) throws InvoiceApiException {
        dao.changeInvoiceStatus(invoiceId, InvoiceStatus.COMMITTED, context);
    }
}
