D-Net

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",usagestats);

        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"));

    }

}