service/src/main/java/io/mifos/individuallending/internal/command/handler/CaseDocumentsCommandHandler.java

/*
 * Copyright 2017 Kuelap, Inc.
 *
 * Licensed 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 io.mifos.individuallending.internal.command.handler;

import io.mifos.core.command.annotation.Aggregate;
import io.mifos.core.command.annotation.CommandHandler;
import io.mifos.core.command.annotation.CommandLogLevel;
import io.mifos.core.command.annotation.EventEmitter;
import io.mifos.core.lang.ServiceException;
import io.mifos.individuallending.api.v1.domain.caseinstance.CaseCustomerDocuments;
import io.mifos.individuallending.api.v1.events.IndividualLoanEventConstants;
import io.mifos.individuallending.internal.command.ChangeCaseDocuments;
import io.mifos.individuallending.internal.mapper.CaseCustomerDocumentsMapper;
import io.mifos.individuallending.internal.repository.CaseCustomerDocumentEntity;
import io.mifos.individuallending.internal.repository.CaseCustomerDocumentsRepository;
import io.mifos.individuallending.internal.repository.CaseParametersEntity;
import io.mifos.individuallending.internal.repository.CaseParametersRepository;
import io.mifos.portfolio.api.v1.events.CaseEvent;
import io.mifos.portfolio.service.internal.repository.CaseRepository;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * @author Myrle Krantz
 */
@Aggregate
public class CaseDocumentsCommandHandler {
  final private CaseRepository caseRepository;
  final private CaseParametersRepository caseParametersRepository;
  final private CaseCustomerDocumentsRepository caseCustomerDocumentsRepository;

  public CaseDocumentsCommandHandler(
      final CaseRepository caseRepository,
      final CaseParametersRepository caseParametersRepository,
      final CaseCustomerDocumentsRepository caseCustomerDocumentsRepository) {
    this.caseRepository = caseRepository;
    this.caseParametersRepository = caseParametersRepository;
    this.caseCustomerDocumentsRepository = caseCustomerDocumentsRepository;
  }

  @Transactional
  @CommandHandler(logStart = CommandLogLevel.INFO, logFinish = CommandLogLevel.INFO)
  @EventEmitter(selectorName = IndividualLoanEventConstants.SELECTOR_NAME, selectorValue = IndividualLoanEventConstants.PUT_DOCUMENT)
  public CaseEvent process(final ChangeCaseDocuments command) {
    final CaseParametersEntity caseparametersEntity =
        caseRepository.findByProductIdentifierAndIdentifier(command.getProductIdentifier(), command.getCaseIdentifier())
            .flatMap(x -> caseParametersRepository.findByCaseId(x.getId()))
            .orElseThrow(() -> ServiceException.notFound("Case ''{0}.{1}'' not found", command.getProductIdentifier(), command.getCaseIdentifier()));

    final Map<CaseCustomerDocuments.Document, CaseCustomerDocumentEntity> existingCaseCustomerDocuments
        = caseCustomerDocumentsRepository.findByCaseParametersId(caseparametersEntity.getId())
        .collect(Collectors.toMap(CaseCustomerDocumentsMapper::map, x -> x));

    final List<CaseCustomerDocumentEntity> newCaseCustomerDocuments = CaseCustomerDocumentsMapper.map(
        command.getInstance().getDocuments(),
        caseparametersEntity,
        existingCaseCustomerDocuments);

    final Set<CaseCustomerDocumentEntity> toDelete = caseCustomerDocumentsRepository.findByCaseParametersId(caseparametersEntity.getId())
        .filter(x -> !command.getInstance().getDocuments().contains(CaseCustomerDocumentsMapper.map(x)))
        .collect(Collectors.toSet());

    caseCustomerDocumentsRepository.delete(toDelete);
    caseCustomerDocumentsRepository.save(newCaseCustomerDocuments);

    return new CaseEvent(command.getProductIdentifier(), command.getCaseIdentifier());
  }
}