D-Net

package eu.dnetlib.repo.manager.service;

import eu.dnetlib.usagestats.sushilite.domain.ReportItem;

import eu.dnetlib.usagestats.sushilite.domain.ReportResponseWrapper;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.core.ParameterizedTypeReference;

import org.springframework.http.HttpMethod;

import org.springframework.http.ResponseEntity;

import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;

import org.springframework.security.access.prepost.PreAuthorize;

import org.springframework.stereotype.Service;

import org.springframework.web.client.RestTemplate;

import org.springframework.web.util.UriComponentsBuilder;

import java.util.ArrayList;

import java.util.List;

@Service("sushiliteService")

public class SushiliteServiceImpl implements SushiliteService {

    @Value("${services.provide.usagestats.sushiliteEndpoint}")

    private String usagestatsSushiliteEndpoint;

    private static final org.apache.log4j.Logger LOGGER = org.apache.log4j.Logger.getLogger(SushiliteServiceImpl.class);

    @Override

    @PreAuthorize("hasAuthority('REGISTERED_USER')")

    public ReportResponseWrapper getReportResults(String page,

                                                  String pageSize,

                                                  String Report,

                                                  String Release,

                                                  String RequestorID,

                                                  String BeginDate,

                                                  String EndDate,

                                                  String RepositoryIdentifier,

                                                  String ItemIdentifier,

                                                  String ItemDataType,

                                                  String Granularity,

                                                  String Pretty) {

            //build the uri params

            UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(this.usagestatsSushiliteEndpoint + "GetReport/")

                                                                .queryParam("Report", Report)

                                                                .queryParam("Release", Release)

                                                                .queryParam("RequestorID", RequestorID)

                                                                .queryParam("BeginDate", BeginDate)

                                                                .queryParam("EndDate", EndDate)

                                                                .queryParam("RepositoryIdentifier", RepositoryIdentifier)

                                                                .queryParam("ItemIdentifier", ItemIdentifier)

                                                                .queryParam("ItemDataType", ItemDataType)

                                                                .queryParam("Granularity", Granularity)

                                                                .queryParam("Pretty", Pretty);

            //create new template engine

            RestTemplate template = new RestTemplate();

            template.getMessageConverters().add(new MappingJackson2HttpMessageConverter());

            ResponseEntity<ReportResponseWrapper> resp;

            //communicate with endpoint

            resp = template.exchange(

                    builder.build().encode().toUri(),

                    HttpMethod.GET,

                    null,

                    new ParameterizedTypeReference<ReportResponseWrapper>() {

                    });

            // check remote api's response

            System.out.println("sushi responded status " + resp.getStatusCode());

            // get the items corresponding to the requested page

            List<ReportItem> requestedItemList = new ArrayList<>();

            if (resp.getBody().getReportResponse().getReportWrapper().getReport().getCustomer().getReportItems() != null) {

                try {

                    int totalItems = resp.getBody().getReportResponse().getReportWrapper().getReport().getCustomer().getReportItems().size();

                    int size = Integer.parseInt(pageSize);

                    int offset = Integer.parseInt(page)*size;

                    if (offset < totalItems ) {

                        int upperIndex = offset+size;

                        if (upperIndex > totalItems) {

                            upperIndex = totalItems;

                        }

                        requestedItemList = resp.getBody().getReportResponse().getReportWrapper().getReport().getCustomer().getReportItems().subList(offset,upperIndex);

                    }

                } catch (NumberFormatException e) {

                    LOGGER.debug("Exception on getReportResults - trying to cast strings to integers", e);

                    //emailUtils.reportException(e);

                    throw e;

                }

            }

            ReportResponseWrapper newReportResponse = resp.getBody();

            newReportResponse.getReportResponse().getReportWrapper().getReport().getCustomer().setReportItems(requestedItemList);

            return newReportResponse;

    }

}