작업시간계산 두번째

import java.time.*;
import java.time.temporal.ChronoUnit;

public class WorkTimeCalculator {

    private static final LocalTime MIN_START = LocalTime.of(8, 30);
    private static final Duration DAILY_MAX = Duration.ofHours(8);
    private static final Duration MINIMUM_WORK_TIME = Duration.ofMinutes(6);

    public static Duration calculateWorkDuration(LocalDateTime start, LocalDateTime end) {
        if (end.isBefore(start)) return Duration.ZERO;

        Duration total = Duration.ZERO;
        LocalDate currentDate = start.toLocalDate();

        while (!currentDate.isAfter(end.toLocalDate())) {
            DayOfWeek day = currentDate.getDayOfWeek();
            if (day == DayOfWeek.SATURDAY || day == DayOfWeek.SUNDAY) {
                currentDate = currentDate.plusDays(1);
                continue;
            }

            Duration workDuration = Duration.ZERO;

            // 시작일 처리
            if (currentDate.equals(start.toLocalDate())) {
                LocalTime from = start.toLocalTime().isBefore(MIN_START) ? MIN_START : start.toLocalTime();
                LocalTime to = currentDate.equals(end.toLocalDate()) ? end.toLocalTime() : LocalTime.MAX;
                if (to.isBefore(from)) {
                    workDuration = Duration.ZERO;
                } else {
                    workDuration = Duration.between(from, to);
                }
            }

            // 종료일 처리
            else if (currentDate.equals(end.toLocalDate())) {
                LocalTime from = MIN_START;
                LocalTime to = end.toLocalTime();
                if (to.isAfter(from)) {
                    workDuration = Duration.between(from, to);
                }
            }

            // 중간일 처리
            else {
                workDuration = DAILY_MAX;
            }

            // 하루 최대 8시간 제한
            if (workDuration.compareTo(DAILY_MAX) > 0) {
                workDuration = DAILY_MAX;
            }

            total = total.plus(workDuration);
            currentDate = currentDate.plusDays(1);
        }

        // 최소 시간 보정
        if (total.compareTo(MINIMUM_WORK_TIME) < 0) {
            total = MINIMUM_WORK_TIME;
        }

        return total;
    }

    // 예시 테스트
    public static void main(String[] args) {
        LocalDateTime start = LocalDateTime.of(2025, 5, 15, 19, 0);
        LocalDateTime end = LocalDateTime.of(2025, 5, 16, 20, 0);
        Duration result = calculateWorkDuration(start, end);
        System.out.println("작업시간 (분): " + result.toMinutes());
    }
}