package eu.dnetlib.repo.manager.service.customHystrixCommands;

import com.netflix.hystrix.HystrixCommand;
import com.netflix.hystrix.HystrixCommandGroupKey;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponents;
import org.springframework.web.util.UriComponentsBuilder;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class LastYearUsageStatsHystrixCommand extends HystrixCommand<Map> {

    RestTemplate restTemplate;
    String usagestatsBaseAddress;

    public LastYearUsageStatsHystrixCommand(String usagestatsBaseAddress,RestTemplate restTemplate) {
        super(HystrixCommandGroupKey.Factory.asKey("StatisticsGroup"));
        this.usagestatsBaseAddress = usagestatsBaseAddress;
        this.restTemplate = restTemplate;
    }

    @Override
    protected Map run() throws Exception {
        UriComponents uriComponents = UriComponentsBuilder
                .fromHttpUrl(usagestatsBaseAddress + "/totals")
                .build().encode();

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

        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;
    }

    @Override
    protected Map getFallback() {
        return null;
    }

}