presence/Domain/UseCase/PresenceUseCase.cs

using presence.Data.LocalData.Entity;
using presence.Data.ReportsHistory;
using presence.Data.Repository;
using presence.Domain.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;

namespace presence.Domain.UseCase
{
    public class PresenceUseCase
    {
        private readonly IPresenceRepository _presenceRepositoryImpl;
        private readonly IGroupRepository _groupRepositoryImpl;
        private readonly IUserRepository _userRepositoryImpl;
        public List<Presence> GetPresenceByGroup(int groupId)
        {
            var users = _userRepositoryImpl.GetAllUser().Where(x => x.GroupID == groupId).ToList();

            var presenceByGroup = _presenceRepositoryImpl.GetPresenceByGroup(groupId)
            .Where(x => users.Any(user => user.UserID == x.UserDaoUserId))
            .Select(presence => new Presence
            {
                User = new User
                {
                    UserID = presence.UserDaoUserId,
                    UserGroup = new Group
                    {
                        ID = groupId,
                        Name = _groupRepositoryImpl.GetAllGroup().First(group => group.ID == groupId).Name
                    },
                    UserFIO = users.First(user => user.UserID == presence.UserDaoUserId).UserFIO,
                },
                ClassNum = presence.LessonNumber,
                Date = presence.Date,
                IsAttedance = presence.IsAttedance,
            }).ToList();
            return (List<Presence>)presenceByGroup;
        }
        public List<Presence> GetPresenceByGroupAndDate(int groupId, DateOnly date)
        {
            var users = _userRepositoryImpl.GetAllUser().Where(x => x.GroupID == groupId).ToList();

            var presenceByGroup = _presenceRepositoryImpl.GetPresenceByGroup(groupId)
            .Where(x => users.Any(user => user.UserID == x.UserDaoUserId && x.Date == date))
            .Select(presence => new Presence
            {
                User = new User
                {
                    UserID = presence.UserDaoUserId,
                    UserGroup = new Group
                    {
                        ID = groupId,
                        Name = _groupRepositoryImpl.GetAllGroup().First(group => group.ID == groupId).Name
                    },
                    UserFIO = users.First(user => user.UserID == presence.UserDaoUserId).UserFIO,
                },
                ClassNum = presence.LessonNumber,
                Date = presence.Date,
                IsAttedance = presence.IsAttedance,
            }).ToList();
            return presenceByGroup;
        }
        public bool UnCheckAttendance(int firstClass, int lastClass, DateOnly date, int userID)
        {
            return _presenceRepositoryImpl.UnCheckAttendence(firstClass, lastClass, date, userID);
        }

        public Dictionary<string, int> GetPresenceStatsByGroup(int groupId)
        {
            var stats = new Dictionary<string, int>();

            // Получаем всех студентов группы
            var users = _userRepositoryImpl.GetAllUser().Where(x => x.GroupID == groupId).ToList();
            stats["Количество студентов"] = users.Count;

            // Получаем все записи посещаемости для группы
            var presences = _presenceRepositoryImpl.GetPresenceByGroup(groupId);

            // Считаем количество уникальных занятий
            var uniqueLessons = presences
                .Select(p => new { p.Date, p.LessonNumber })
                .Distinct()
                .Count();
            stats["Количество занятий"] = uniqueLessons;

            // Считаем общую посещаемость
            var totalAttendances = presences.Count(p => p.IsAttedance);
            var totalPossibleAttendances = users.Count * uniqueLessons;

            if (totalPossibleAttendances > 0)
            {
                var attendancePercentage = (totalAttendances * 100) / totalPossibleAttendances;
                stats["Процент посещаемости"] = attendancePercentage;
            }
            else
            {
                stats["Процент посещаемости"] = 0;
            }

            return stats;
        }
    }
}