/*
 * Copyright 2010-2013 Ning, Inc.
 *
 * Ning 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.dao;

import java.math.BigDecimal;

import javax.annotation.Nullable;

import org.killbill.billing.invoice.api.InvoiceItem;
import org.killbill.billing.invoice.api.InvoicePayment;
import org.killbill.billing.invoice.calculator.InvoiceCalculatorUtils;
import org.killbill.billing.invoice.model.DefaultInvoicePayment;
import org.killbill.billing.invoice.model.InvoiceItemFactory;

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

public class InvoiceModelDaoHelper {

    private InvoiceModelDaoHelper() {}

    public static BigDecimal getBalance(final InvoiceModelDao invoiceModelDao) {
        return InvoiceCalculatorUtils.computeInvoiceBalance(invoiceModelDao.getCurrency(),
                                                            Iterables.transform(invoiceModelDao.getInvoiceItems(), new Function<InvoiceItemModelDao, InvoiceItem>() {
                                                                @Override
                                                                public InvoiceItem apply(final InvoiceItemModelDao input) {
                                                                    return InvoiceItemFactory.fromModelDao(input);
                                                                }
                                                            }),
                                                            Iterables.transform(invoiceModelDao.getInvoicePayments(), new Function<InvoicePaymentModelDao, InvoicePayment>() {
                                                                @Nullable
                                                                @Override
                                                                public InvoicePayment apply(final InvoicePaymentModelDao input) {
                                                                    return new DefaultInvoicePayment(input);
                                                                }
                                                            }),
                                                            invoiceModelDao.isMigrated() || invoiceModelDao.isWrittenOff());
    }

    public static BigDecimal getCBAAmount(final InvoiceModelDao invoiceModelDao) {
        return InvoiceCalculatorUtils.computeInvoiceAmountCredited(invoiceModelDao.getCurrency(),
                                                                   Iterables.transform(invoiceModelDao.getInvoiceItems(), new Function<InvoiceItemModelDao, InvoiceItem>() {
                                                                       @Override
                                                                       public InvoiceItem apply(final InvoiceItemModelDao input) {
                                                                           return InvoiceItemFactory.fromModelDao(input);
                                                                       }
                                                                   }));
    }

    public static BigDecimal getAmountCharged(final InvoiceModelDao invoiceModelDao) {
        return InvoiceCalculatorUtils.computeInvoiceAmountCharged(invoiceModelDao.getCurrency(),
                                                            Iterables.transform(invoiceModelDao.getInvoiceItems(), new Function<InvoiceItemModelDao, InvoiceItem>() {
                                                                @Override
                                                                public InvoiceItem apply(final InvoiceItemModelDao input) {
                                                                    return InvoiceItemFactory.fromModelDao(input);
                                                                }
                                                            }));
    }
}