slarny4/Demo1/Data/Repository/PresenceRepositoryImpl.cs

using AttendanceApp.Data.Exceptions;
using AttendanceApp.Data.LocalData;
using AttendanceApp.Domain.Models;
using System.Collections.Generic;
using System.Linq;

namespace AttendanceApp.Data.Repository
{
    public class PresenceRepositoryImpl : IPresenceRepository
    {
        private readonly List<LocalPresence> _presences = LocalStaticData.Presences;

        public IEnumerable<Presence> GetPresenceByGroupAndDate(int groupId, DateTime date)
        {
            var usersInGroup = LocalStaticData.Users.Where(u => u.GroupID == groupId).Select(u => u.Id);
            return _presences
                .Where(p => usersInGroup.Contains(p.UserId) && p.ClassDate.Date == date.Date)
                .Select(p => new Presence
                {
                    ClassDate = p.ClassDate,
                    ClassNumber = p.ClassNumber,
                    IsPresent = p.IsPresent,
                    UserId = p.UserId
                });
        }

        public IEnumerable<Presence> GetPresenceByGroup(int groupId)
        {
            var usersInGroup = LocalStaticData.Users
                .Where(u => u.GroupID == groupId)
                .Select(u => u.Id);

            return _presences
                .Where(p => usersInGroup.Contains(p.UserId))
                .Select(p => new Presence
                {
                    ClassDate = p.ClassDate,
                    ClassNumber = p.ClassNumber,
                    IsPresent = p.IsPresent,
                    UserId = p.UserId
                })
                .OrderBy(p => p.ClassDate)
                .ThenBy(p => p.ClassNumber);
        }

        public void AddPresence(Presence presence)
        {
            _presences.Add(new LocalPresence
            {
                ClassDate = presence.ClassDate,
                ClassNumber = presence.ClassNumber,
                IsPresent = presence.IsPresent,
                UserId = presence.UserId
            });
        }

        public void UpdatePresence(Presence presence)
        {
            var localPresence = _presences.FirstOrDefault(p =>
                p.UserId == presence.UserId &&
                p.ClassDate.Date == presence.ClassDate.Date &&
                p.ClassNumber == presence.ClassNumber);

            if (localPresence == null)
                throw new RepositoryException("Посещаемость не найдена.");

            localPresence.IsPresent = presence.IsPresent;
        }
    }
}