covid19-ru/covid19-api/src/main/java/com/bvn13/covid19/api/controllers/MainController.java

package com.bvn13.covid19.api.controllers;

import com.bvn13.covid19.api.model.CovidStatsInfo;
import com.bvn13.covid19.api.model.CovidStatsResponse;
import com.bvn13.covid19.api.service.CovidStatsMaker;
import com.bvn13.covid19.model.entities.CovidStat;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.PostConstruct;
import java.time.ZoneId;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

@RequiredArgsConstructor
@RestController
@RequestMapping("/")
public class MainController {

    private final CovidStatsMaker covidStatsMaker;

    @Value("${app.zone-id}")
    private String zoneIdStr;
    private ZoneId zoneId;

    @PostConstruct
    public void init() {
        zoneId = ZoneId.of(zoneIdStr);
    }

    @GetMapping
    public CovidStatsResponse getStatistics() {
        return covidStatsMaker.findLastUpdateInfo()
                .map(updateInfo -> CovidStatsResponse.builder()
                        .datetime(updateInfo.getDatetime())
                        .updatedOn(updateInfo.getCreatedOn().atZone(zoneId))
                        .stats(convertStats(covidStatsMaker.findCovidStatsByUpdateInfoId(updateInfo.getId())))
                        .build())
                .orElse(CovidStatsResponse.builder().build());
    }

    private List<CovidStatsInfo> convertStats(Collection<CovidStat> stats) {
        return stats.stream()
                .map(stat -> CovidStatsInfo.builder()
                        .region(stat.getRegion().getName())
                        .sick(stat.getSick())
                        .healed(stat.getHealed())
                        .died(stat.getDied())
                        .build())
                .collect(Collectors.toList());
    }

}