report

@Service
@Data
@Slf4j
public class ReportServiceImpl implements ReportService {

    private CategoryRepository categoryRepository;

    private RequestRepository requestRepository;

    @Override
    public BigDecimal spentMoneyAll() {
        return null;
    }

    @Override
    public BigDecimal quarterBalanceAll() {
        return null;
    }

    @Override
    public BigDecimal quarterBalance() {
        return null;
    }

    @Override
    public Map<Category, BigDecimal> distributionByCategoryForYTD(Set<Location> locations) {

        LocalDate firstDayYear = LocalDate.ofYearDay(LocalDate.now().getYear(),1);

        return  calculate(firstDayYear, locations);
    }

    @Override
    public Map<Category, BigDecimal> distributionByCategoryForTheYear(Set<Location> locations) {

        LocalDate dayYearAgo = LocalDate.ofYearDay(LocalDate.now().getYear()-1,LocalDate.now().getDayOfYear());

        return calculate(dayYearAgo,locations);
    }

    private Map<Category, BigDecimal> calculate(LocalDate day, Set<Location> locations){
        Map<Category, BigDecimal> distributionByCategory = new HashMap<>();

        List<Category> categories = categoryRepository.findAll();
        List<Request> requests = requestRepository.findAll();

        List<Request> thisYearRequests = requests.stream()
                .filter(request -> request.getCreationDate().isAfter(day) || request.getCreationDate().equals(day))
                .filter(request -> locations.contains(request.getUser().getLocation()))
                .collect(Collectors.toList());

        Integer requestCount = thisYearRequests.size();

        for (Category category:
                categories) {
            List<Request> thisYearRequestsWithCurrentCategory = thisYearRequests
                    .stream()
                    .filter(request -> request.getCategory().equals(category))
                    .collect(Collectors.toList());

            Integer requestCountWithCurrentCategory = thisYearRequestsWithCurrentCategory.size();
            BigDecimal percent = new BigDecimal(requestCountWithCurrentCategory/requestCount);

            distributionByCategory.put(category, percent);
        }

        return  distributionByCategory;
    }
}