using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo.Domain.UseCase
{
    public class UseCasePresence
    {
        private Dictionary<string, List<DateTime>> attendanceRecords;

        public UseCasePresence()
        {
            attendanceRecords = new Dictionary<string, List<DateTime>>();
        }

        public void MarkAttendance(string group, DateTime date)
        {
            if (!attendanceRecords.ContainsKey(group))
            {
                attendanceRecords[group] = new List<DateTime>();
            }
            attendanceRecords[group].Add(date);
        }

        public List<DateTime> GetAttendanceByGroup(string group)
        {
            if (attendanceRecords.ContainsKey(group))
            {
                return attendanceRecords[group];
            }
            return new List<DateTime>();
        }

        public List<DateTime> GetAttendanceByGroupAndDate(string group, DateTime date)
        {
            if (attendanceRecords.ContainsKey(group))
            {
                return attendanceRecords[group].Where(d => d.Date == date.Date).ToList();
            }
            return new List<DateTime>();
        }

        public void MarkUserAsAbsent(string group, DateTime startDate, DateTime endDate)
        {
            if (attendanceRecords.ContainsKey(group))
            {
                for (DateTime date = startDate; date <= endDate; date = date.AddDays(1))
                {
                    attendanceRecords[group].Remove(date);
                }
            }
        }
    }
}