import dayjs from '../common/dayjs';

export function toMinutes(time: string): number {
  const [hour, minute] = time.split(':').map(Number);
  return hour * 60 + minute;
}

export function getCourseClock(date: Date): { date: string; minutes: number } {
  const d = dayjs(date);
  return {
    date: d.format('YYYY-MM-DD'),
    minutes: d.hour() * 60 + d.minute(),
  };
}

export function shiftDate(date: string, days: number): string {
  return dayjs.utc(`${date}T00:00:00.000Z`).add(days, 'day').format('YYYY-MM-DD');
}

export function mapLessonScheduleTimeToSession(startTime: string): string {
  const hour = parseInt(startTime.slice(0, 2), 10);
  if (hour < 8) return 'morning_reading';
  if (hour < 12) return 'morning';
  if (hour < 17) return 'afternoon';
  if (hour < 20) return 'evening_study';
  return 'night_check';
}

export function isClassStudentActiveOnDate(
  classStudent: Pick<
    import('../entities/class-student.entity').ClassStudent,
    'joinDate' | 'leaveDate' | 'status'
  >,
  lessonDate: string,
): boolean {
  const status = classStudent.status ?? 'active';
  if (!['active', 'left'].includes(status)) return false;
  if (classStudent.joinDate && classStudent.joinDate > lessonDate) return false;
  if (classStudent.leaveDate && classStudent.leaveDate < lessonDate) return false;
  return true;
}