service/src/main/java/org/apache/fineract/cn/individuallending/internal/command/handler/LossProvisionStepsCommandHandler.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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.apache.fineract.cn.individuallending.internal.command.handler;

import org.apache.fineract.cn.individuallending.api.v1.events.IndividualLoanEventConstants;
import org.apache.fineract.cn.individuallending.internal.command.ChangeLossProvisionSteps;
import org.apache.fineract.cn.individuallending.internal.mapper.LossProvisionStepMapper;
import org.apache.fineract.cn.individuallending.internal.repository.LossProvisionStepEntity;
import org.apache.fineract.cn.individuallending.internal.repository.LossProvisionStepRepository;
import org.apache.fineract.cn.portfolio.service.internal.repository.ProductEntity;
import org.apache.fineract.cn.portfolio.service.internal.repository.ProductRepository;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
import org.apache.fineract.cn.command.annotation.Aggregate;
import org.apache.fineract.cn.command.annotation.CommandHandler;
import org.apache.fineract.cn.command.annotation.CommandLogLevel;
import org.apache.fineract.cn.command.annotation.EventEmitter;
import org.apache.fineract.cn.lang.ServiceException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;


/**
 * @author Myrle Krantz
 */
@Aggregate
public class LossProvisionStepsCommandHandler {
  private final LossProvisionStepRepository lossProvisionStepRepository;
  private final ProductRepository productRepository;

  @Autowired
  public LossProvisionStepsCommandHandler(
      final LossProvisionStepRepository lossProvisionStepRepository,
      final ProductRepository productRepository) {
    this.lossProvisionStepRepository = lossProvisionStepRepository;
    this.productRepository = productRepository;
  }

  @Transactional
  @CommandHandler(logStart = CommandLogLevel.INFO, logFinish = CommandLogLevel.INFO)
  @EventEmitter(
      selectorName = IndividualLoanEventConstants.SELECTOR_NAME,
      selectorValue = IndividualLoanEventConstants.PUT_LOSS_PROVISION_STEPS)
  public String process(final ChangeLossProvisionSteps command) {
    final ProductEntity productEntity = productRepository.findByIdentifier(command.getProductIdentifier())
        .orElseThrow(() -> ServiceException.notFound("Product not found ''{0}''.", command.getProductIdentifier()));
    final Map<Integer, LossProvisionStepEntity> existingLossProvisionSteps =
        lossProvisionStepRepository.findByProductId(productEntity.getId())
        .collect(Collectors.toMap(LossProvisionStepEntity::getDaysLate, Function.identity()));

    final Map<Integer, LossProvisionStepEntity> newLossProvisionSteps =
        command.getLossProvisionConfiguration().getLossProvisionSteps().stream()
            .map(newLossProvisionStep -> {
              final LossProvisionStepEntity existingLossProvisionStepEntity = existingLossProvisionSteps.get(newLossProvisionStep.getDaysLate());
              if (existingLossProvisionStepEntity != null) {
                existingLossProvisionStepEntity.setPercentProvision(newLossProvisionStep.getPercentProvision());
                return existingLossProvisionStepEntity;
              } else {
                return LossProvisionStepMapper.map(productEntity.getId(), newLossProvisionStep);
              }
            })
            .collect(Collectors.toMap(LossProvisionStepEntity::getDaysLate, Function.identity()));
    newLossProvisionSteps.values().forEach(lossProvisionStepRepository::save);

    existingLossProvisionSteps.forEach((daysLate, lossProvisionStep) -> {
      if (newLossProvisionSteps.get(daysLate) == null)
        lossProvisionStepRepository.delete(lossProvisionStep);
    });

    return command.getProductIdentifier();
  }
}