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/* 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 org.camunda.bpm.engine.rest.impl.history;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.camunda.bpm.engine.ProcessEngine;
import org.camunda.bpm.engine.history.HistoricActivityInstance;
import org.camunda.bpm.engine.history.HistoricActivityInstanceQuery;
import org.camunda.bpm.engine.rest.dto.CountResultDto;
import org.camunda.bpm.engine.rest.dto.history.HistoricActivityInstanceDto;
import org.camunda.bpm.engine.rest.dto.history.HistoricActivityInstanceQueryDto;
import org.camunda.bpm.engine.rest.history.HistoricActivityInstanceRestService;
import org.camunda.bpm.engine.rest.sub.history.HistoricActivityInstanceResource;
import org.camunda.bpm.engine.rest.sub.history.impl.HistoricActivityInstanceResourceImpl;

import javax.ws.rs.core.UriInfo;
import java.util.ArrayList;
import java.util.List;

public class HistoricActivityInstanceRestServiceImpl implements HistoricActivityInstanceRestService {

  protected ObjectMapper objectMapper;
  protected ProcessEngine processEngine;

  public HistoricActivityInstanceRestServiceImpl(ObjectMapper objectMapper, ProcessEngine processEngine) {
    this.objectMapper = objectMapper;
    this.processEngine = processEngine;
  }

  public HistoricActivityInstanceResource getHistoricCaseInstance(String activityInstanceId) {
    return new HistoricActivityInstanceResourceImpl(processEngine, activityInstanceId);
  }

  @Override
  public List getHistoricActivityInstances(UriInfo uriInfo, Integer firstResult, Integer maxResults) {
    HistoricActivityInstanceQueryDto queryHistoricActivityInstanceDto = new HistoricActivityInstanceQueryDto(objectMapper, uriInfo.getQueryParameters());
    return queryHistoricActivityInstances(queryHistoricActivityInstanceDto, firstResult, maxResults);
  }

  @Override
  public List queryHistoricActivityInstances(HistoricActivityInstanceQueryDto queryDto, Integer firstResult, Integer maxResults) {
    queryDto.setObjectMapper(objectMapper);
    HistoricActivityInstanceQuery query = queryDto.toQuery(processEngine);

    List matchingHistoricActivityInstances;
    if (firstResult != null || maxResults != null) {
      matchingHistoricActivityInstances = executePaginatedQuery(query, firstResult, maxResults);
    } else {
      matchingHistoricActivityInstances = query.list();
    }

    List historicActivityInstanceResults = new ArrayList();
    for (HistoricActivityInstance historicActivityInstance : matchingHistoricActivityInstances) {
      HistoricActivityInstanceDto resultHistoricActivityInstance = HistoricActivityInstanceDto.fromHistoricActivityInstance(historicActivityInstance);
      historicActivityInstanceResults.add(resultHistoricActivityInstance);
    }
    return historicActivityInstanceResults;
  }

  private List executePaginatedQuery(HistoricActivityInstanceQuery query, Integer firstResult, Integer maxResults) {
    if (firstResult == null) {
      firstResult = 0;
    }
    if (maxResults == null) {
      maxResults = Integer.MAX_VALUE;
    }
    return query.listPage(firstResult, maxResults);
  }

  @Override
  public CountResultDto getHistoricActivityInstancesCount(UriInfo uriInfo) {
    HistoricActivityInstanceQueryDto queryDto = new HistoricActivityInstanceQueryDto(objectMapper, uriInfo.getQueryParameters());
    return queryHistoricActivityInstancesCount(queryDto);
  }

  @Override
  public CountResultDto queryHistoricActivityInstancesCount(HistoricActivityInstanceQueryDto queryDto) {
    queryDto.setObjectMapper(objectMapper);
    HistoricActivityInstanceQuery query = queryDto.toQuery(processEngine);

    long count = query.count();
    CountResultDto result = new CountResultDto();
    result.setCount(count);

    return result;
  }
}