presence/data/Repository/SQLPresenceRepository.cs

using data.DAO;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;   
using System.Linq;

namespace data.Repository
{
    public class SQLPresenceRepository : IPresenceRepository
    {
        private readonly DatabaseContext _context;

        public SQLPresenceRepository(DatabaseContext context)
        {
            _context = context;
        }

        public IEnumerable<Diary> GetPresence(
            int groupId,
            int? subjectId = null,
            DateOnly? date = null,
            int? studentId = null)
        {
            var query = _context.Diaries
                .Include(p => p.Student)
                .Include(p => p.StudentGroupSubject)
                    .ThenInclude(p => p.Subject)
                .Include(p => p.Traffic)
                .Where(p => p.Student.GroupId == groupId);

            if (subjectId.HasValue)
                query = query.Where(p => p.StudentGroupSubject.Subject.Id == subjectId.Value);

            if (date.HasValue)
                query = query.Where(p => p.Date == date.Value);

            if (studentId.HasValue)
                query = query.Where(p => p.Student.Id == studentId.Value);

            return query.ToList();
        }

        public void DeleteAllPresence()
        {
            _context.Diaries.RemoveRange(_context.Diaries);
            _context.SaveChanges();
        }

        public void DeleteGroupPresence(int groupId)
        {
            var presencesToDelete = _context.Diaries
                .Include(p => p.Student)
                .Where(p => p.Student.GroupId == groupId);

            _context.Diaries.RemoveRange(presencesToDelete);
            _context.SaveChanges();
        }

        public void AddPresenceRecords(List<Diary> items)
        {
            _context.Diaries.AddRange(items);
            _context.SaveChanges();
        }

        public void UpdatePresenceRecords(List<Diary> items)
        {
            foreach (var item in items)
            {
                var existingRecord = _context.Diaries
                    .FirstOrDefault(p => 
                        p.Date == item.Date && 
                        p.NumberSubject == item.NumberSubject && 
                        p.StudentId == item.StudentId);

                if (existingRecord != null)
                {
                    existingRecord.TrafficId = item.TrafficId;
                }
            }
            _context.SaveChanges();
        }
    }
}