uoa-repository-manager-service/src/main/java/eu/dnetlib/repo/manager/service/StatsServiceImpl.java

package eu.dnetlib.repo.manager.service;

import eu.dnetlib.repo.manager.controllers.RestTemplateResponseErrorHandler;
import eu.dnetlib.repo.manager.exception.EndPointException;
import org.apache.log4j.Logger;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponents;
import org.springframework.web.util.UriComponentsBuilder;

import javax.annotation.PostConstruct;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service("statsService")
public class StatsServiceImpl implements StatsService {

    private RestTemplate restTemplate = null;

    private HttpHeaders httpHeaders;

    private static final Logger LOGGER = Logger.getLogger(RepositoryServiceImpl.class);

    @Value("${search.api.baseAddress}")
    private String baseAddress;

    @Value("${search.api.usagestats}")
    private String usagestatsBaseAddress;

    @Value("${search.api.usageEvents}")
    private String usagestatsEvents;

    @Autowired
    RestTemplateResponseErrorHandler restTemplateResponseErrorHandler;

    @PostConstruct
    private void init() {
        LOGGER.debug("Initialization method of statistics api!");
        restTemplate = new RestTemplate();
        restTemplate.setErrorHandler(restTemplateResponseErrorHandler);
        restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
        httpHeaders = new HttpHeaders();
        httpHeaders.set("Content-Type", "application/json");
    }


    @Override
    public Map<String, Object> getStatistics() throws JSONException {

        String aggregators =  getTotalByType("datasource",baseAddress+"/resources",
                    "?query= " +
                    " oaftype exact datasource and " +
                    " ( datasourcetypename exact Institutional Repository Aggregator " +
                    "     or datasourcetypename exact Publication Repository Aggregator )");

        String dataRepositories =  getTotalByType("datasource",baseAddress+"/resources",
                    "?query= " +
                    " oaftype exact datasource and " +
                    " datasourcetypename exact Data Repository " );

        String literature = getTotalByType("datasource",baseAddress+"/resources",
                    "?query= " +
                    " oaftype exact datasource and " +
                    " ( datasourcetypename exact Institutional Repository  " +
                    "     or datasourcetypename exact Publication Repository )");

        String journal =  getTotalByType("datasource",baseAddress+"/resources",
                    "?query= " +
                    " oaftype exact datasource and " +
                    " datasourcetypename exact Journal");

        String publications = getTotalByType("other",baseAddress,"/publications/count");
        String datasets =  getTotalByType("other",baseAddress,"/datasets/count");
        String software = getTotalByType("other",baseAddress,"/software/count");


        Map lastYearUsagestats =  getLastYearUsageStatsTotal();
        Map<String,Object> stats = new HashMap<>();
        stats.put("aggregators",aggregators);
        stats.put("dataRepositories",dataRepositories);
        stats.put("literature",literature);
        stats.put("journal",journal);
        stats.put("publications",publications);
        stats.put("datasets",datasets);
        stats.put("software",software);
        stats.put("lastYearUsagestats", lastYearUsagestats != null ? lastYearUsagestats.toString() : null);

//        Integer usagestats = getUsageStatsTotal();
        stats.put("usagestats","N/A");
        return stats;
    }


    private String getTotalByType(String type,String url,String query) {
        UriComponents uriComponents = UriComponentsBuilder
                .fromHttpUrl(url + query)
                .queryParam("page",0)
                .queryParam("size",0)
                .queryParam("format","json")
                .build().encode();

        ResponseEntity rs = restTemplate.exchange(uriComponents.toUri(), HttpMethod.GET,null,Map.class);

       // if(rs.getStatusCode().equals(HttpStatus.OK)){
            if(type.equalsIgnoreCase("datasource")){
               Map metadata = (Map) ((Map)rs.getBody()).get("meta");
                return String.valueOf(metadata.get("total"));
            }else {
                Map metadata = (Map) (rs.getBody());
                return String.valueOf(metadata.get("total"));
            }
        //}
       // return null;
    }

    private Map getLastYearUsageStatsTotal()  {

        UriComponents uriComponents = UriComponentsBuilder
                .fromHttpUrl(usagestatsBaseAddress + "/totals")
                .build().encode();

        ResponseEntity rs = restTemplate.exchange(uriComponents.toUri(), HttpMethod.GET,null,Map.class);

       // if(rs.getStatusCode().equals(HttpStatus.OK)){

            List yearly_stats = (List) ((Map)rs.getBody()).get("yearly_stats");
            Map lastYear = (Map) yearly_stats.get(yearly_stats.size()-1);
            Integer downloads = (Integer) lastYear.get("downloads");
            Integer views = (Integer) lastYear.get("views");
            Integer year = (Integer) lastYear.get("year");

            Map<String,Object> usagestats = new HashMap<>();
            usagestats.put("number",String.valueOf(downloads+views));
            usagestats.put("year",year);

            return usagestats;
        //}
    }

    private Integer getUsageStatsTotal() throws JSONException {
        UriComponents uriComponents = UriComponentsBuilder
                .fromHttpUrl(usagestatsEvents)
                .build().encode();

//        ResponseEntity rs = restTemplate.exchange(uriComponents.toUri(), HttpMethod.GET,null,Map.class);
        String rs = restTemplate.getForObject(uriComponents.toUri(), String.class);
        JSONObject resultSet = new JSONObject(rs);
        JSONObject totals = resultSet.getJSONObject("totals");
        return Integer.valueOf(totals.getString("events"));
    }
}