OpenIsle/backend/src/main/java/com/openisle/service/StatService.java

package com.openisle.service;

import com.openisle.repository.UserRepository;
import com.openisle.repository.PostRepository;
import com.openisle.repository.CommentRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.util.LinkedHashMap;
import java.util.Map;

@Service
@RequiredArgsConstructor
public class StatService {
    private final UserRepository userRepository;
    private final PostRepository postRepository;
    private final CommentRepository commentRepository;

    private Map<LocalDate, Long> toDateMap(LocalDate start, LocalDate end, java.util.List<Object[]> list) {
        Map<LocalDate, Long> result = new LinkedHashMap<>();
        for (var obj : list) {
            Object dateObj = obj[0];
            LocalDate d;
            if (dateObj instanceof java.sql.Date sqlDate) {
                d = sqlDate.toLocalDate();
            } else if (dateObj instanceof LocalDate localDate) {
                d = localDate;
            } else {
                d = LocalDate.parse(dateObj.toString());
            }
            Long c = ((Number) obj[1]).longValue();
            result.put(d, c);
        }
        for (LocalDate d = start; !d.isAfter(end); d = d.plusDays(1)) {
            result.putIfAbsent(d, 0L);
        }
        return result;
    }

    public Map<LocalDate, Long> countNewUsersRange(LocalDate start, LocalDate end) {
        java.util.List<Object[]> list = userRepository.countDailyRange(start.atStartOfDay(), end.plusDays(1).atStartOfDay());
        return toDateMap(start, end, list);
    }

    public Map<LocalDate, Long> countPostsRange(LocalDate start, LocalDate end) {
        java.util.List<Object[]> list = postRepository.countDailyRange(start.atStartOfDay(), end.plusDays(1).atStartOfDay());
        return toDateMap(start, end, list);
    }

    public Map<LocalDate, Long> countCommentsRange(LocalDate start, LocalDate end) {
        java.util.List<Object[]> list = commentRepository.countDailyRange(start.atStartOfDay(), end.plusDays(1).atStartOfDay());
        return toDateMap(start, end, list);
    }
}