/*
 * Copyright 2017 Graz University of Technology EAAF-Core Components has been developed in a
 * cooperation between EGIZ, A-SIT Plus, A-SIT, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European
 * Commission - subsequent versions of the EUPL (the "Licence"); You may not use this work except in
 * compliance with the Licence. You may obtain a copy of the Licence at:
 * https://joinup.ec.europa.eu/news/understanding-eupl-v12
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the Licence
 * is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the Licence for the specific language governing permissions and limitations under
 * the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text file for details on the
 * various modules and licenses. The "NOTICE" text file is part of the distribution. Any derivative
 * works that you distribute must include a readable copy of the "NOTICE" text file.
*/

package at.gv.egiz.eaaf.core.impl.idp.process.dao;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import at.gv.egiz.eaaf.core.api.idp.process.ProcessInstanceStoreDao;
import at.gv.egiz.eaaf.core.api.storage.ITransactionStorage;
import at.gv.egiz.eaaf.core.exceptions.EaafException;

/**
 * Database backed implementation of the {@link ProcessInstanceStoreDao}
 * interface.
 */
@Service("ProcessInstanceStoreage")
public class ProcessInstanceStoreDaoImpl implements ProcessInstanceStoreDao {

  private final Logger log = LoggerFactory.getLogger(getClass());

  @Autowired
  ITransactionStorage transactionStorage;

  @Override
  public void saveOrUpdate(final ProcessInstanceStore piStore) throws EaafException {
    try {
      transactionStorage.put(piStore.getProcessInstanceId(), piStore, -1);
      log.debug("Store process instance with='{}' in the database.",
          piStore.getProcessInstanceId());

    } catch (final EaafException e) {
      log.warn("ProcessInstanceStore could not be persisted to the database.");
      throw e;
    }
  }

  @Override
  public ProcessInstanceStore load(final String processInstanceId) throws EaafException {
    log.debug("Retrieve the ProcessInstanceStore for id='{}' from the database.",
        processInstanceId);
    ProcessInstanceStore result = null;
    try {
      result = transactionStorage.get(processInstanceId, ProcessInstanceStore.class);

    } catch (final Exception e) {
      log.error("There are multiple persisted processes with the same process instance id '{}'",
          processInstanceId);

      throw e;
    }

    if (result != null) {
      log.debug("Found process instance store for instance '{}'.", processInstanceId);

    } else {
      log.info("Unable to find process instance store for instance '{}'.", processInstanceId);

    }

    return result;
  }

  @Override
  public void remove(final String processInstanceId) throws EaafException {

    log.debug("Delete the ProcessInstanceStore for id='{}' from the database.", processInstanceId);

    if (transactionStorage.containsKey(processInstanceId)) {
      transactionStorage.remove(processInstanceId);
    } else {
      log.trace(
          "ProcessInstanceStore for id='{}' was not found and could therefore not be deleted.",
          processInstanceId);
    }
  }

}