using Demo.Data.LocalData;
using Demo.Data.RemoteData.RemoteDataBase;
using Demo.Data.RemoteData.RemoteDataBase.DAO;
using Demo.domain.Models;
using DocumentFormat.OpenXml.InkML;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Runtime.InteropServices.JavaScript.JSType;

namespace Demo.Data.Repository
{
    public class SQLPresenceRepositoryImpl : IPresenceRepository
    {
        private readonly RemoteDatabaseContext _remoteDatabaseContext;

        public SQLPresenceRepositoryImpl(RemoteDatabaseContext remoteDatabaseContext)
        {
            _remoteDatabaseContext = remoteDatabaseContext;
        }


        public List<PresenceDao> GetAttendanceByGroup(int groupId)
        {
            // Получаем записи посещаемости для указанной группы
            return _remoteDatabaseContext.PresenceDaos
                .Where(p => p.GroupId == groupId)
                .Select(p => new PresenceDao
                {
                    UserGuid = p.UserGuid,
                    GroupId = p.GroupId,
                    Date = p.Date,
                    LessonNumber = p.LessonNumber,
                    IsAttedance = p.IsAttedance
                })
                .ToList();
        }


        public List<PresenceDao> GetPresenceForAbsent(DateTime date, int GroupId)
        {
            return _remoteDatabaseContext.PresenceDaos.Where(p => p.GroupId == GroupId && p.Date == DateOnly.FromDateTime(date)).ToList();
        }
        public List<PresenceDao> GetPresenceByDateAndGroup(DateTime date, int groupId)
        {
            return _remoteDatabaseContext.PresenceDaos.Where(p => p.Date == DateOnly.FromDateTime(date) &&
                                         _remoteDatabaseContext.Users.Any(u => u.GroupId == groupId && u.UserGuid == p.UserGuid)).ToList();
        }

        // Реализация метода для получения всех данных по группе
        public List<PresenceDao> GetPresenceByGroup(int groupId)
        {
            return _remoteDatabaseContext.PresenceDaos.Where(p => p.GroupId == groupId)
                                                      .OrderBy(p => p.Date)
                                                      .ThenBy(p=>p.UserGuid).ToList();
        }

        public void SavePresence(List<PresenceDao> presences)
        {
            _remoteDatabaseContext.PresenceDaos.AddRange(presences.Select(it => new PresenceDao
            {
                Date = it.Date,
                IsAttedance = it.IsAttedance,
                LessonNumber = it.LessonNumber,
                UserGuid = it.UserGuid,
                GroupId = it.GroupId
            }));
            _remoteDatabaseContext.SaveChanges();
        }

        public void UpdateAtt(Guid UserGuid, int groupId, int firstLesson, int lastLesson, DateOnly date, bool isAttendance)
        {
            // Находим все записи по UserId, GroupId, LessonNumber (в диапазоне) и дате
            var presences = _remoteDatabaseContext.PresenceDaos
                .Where(p => p.UserGuid == UserGuid
                            && p.GroupId == groupId
                            && p.LessonNumber >= firstLesson
                            && p.LessonNumber <= lastLesson
                            && p.Date == date)
                .ToList();

            if (presences.Any())
            {
                // Обновляем значение IsAttendance для всех найденных записей
                foreach (var presence in presences)
                {
                    presence.IsAttedance = isAttendance;
                }

                _remoteDatabaseContext.SaveChanges(); // Сохраняем изменения в базе данных
                Console.WriteLine($"Статус посещаемости для пользователя {UserGuid} с {firstLesson} по {lastLesson} урок обновлён.");
            }
            else
            {
                Console.WriteLine($"Посещаемость для пользователя ID: {UserGuid} на дату {date.ToShortDateString()} с {firstLesson} по {lastLesson} уроки не найдена.");
            }
        }

        public DateOnly? GetLastDateByGroupId(int groupId)
        {
            // Проверяем наличие записей о посещаемости в базе данных для данной группы.
            var lastDate = _remoteDatabaseContext.PresenceDaos
                .Where(p => p.GroupId == groupId)
                .OrderByDescending(p => p.Date)
                .Select(p => p.Date)
                .FirstOrDefault();

            return lastDate == default ? (DateOnly?)null : lastDate;
        }

        public List<PresenceDao> PresenceSort(List<PresenceDao> presences)
        {
            presences=_remoteDatabaseContext.PresenceDaos.OrderBy(p=>p.Date).ToList();
            return presences;
        }





        public void GetGeneralPresenceForGroup(int groupId)
        {
            var attendanceRecords = _remoteDatabaseContext.PresenceDaos
                .Where(p => p.GroupId == groupId)
                .OrderBy(p => p.LessonNumber)
                .ToList();

            var uniqueDates = _remoteDatabaseContext.PresenceDaos
                .Select(p => p.Date)
                .Distinct()
                .ToList();

            int sessionId = 0;
            int lessonNum = 1;
            double attendedSessions = 0;
            int totalDays = -1;
            int totalLessons = 0;
            DateOnly currentDate = DateOnly.MinValue;
            List<Guid> uniqueUserGuids = new List<Guid>();

            foreach (var record in attendanceRecords)
            {
                if (!uniqueUserGuids.Contains(record.UserGuid))
                {
                    uniqueUserGuids.Add(record.UserGuid);
                }

                if (record.Date != currentDate)
                {
                    currentDate = record.Date;
                    sessionId++;
                    lessonNum = record.LessonNumber;
                    totalDays++;
                }

                if (record.LessonNumber != lessonNum && currentDate == record.Date)
                {
                    lessonNum = record.LessonNumber;
                    totalLessons++;
                    sessionId++;
                }

                if (record.IsAttedance)
                {
                    attendedSessions++;
                }
            }

            Console.WriteLine(attendanceRecords.Count);
            Console.WriteLine($"Количество студентов в группе: {uniqueUserGuids.Count}, " +
                              $"Количество проведённых занятий: {sessionId}, " +
                              $"Общий процент посещаемости группы: {attendedSessions / uniqueUserGuids.Count / lessonNum / uniqueDates.Count * 100}%");

            List<AttendanceSummary> attendanceSummaryList = new List<AttendanceSummary>();
            List<Guid> processedUserGuids = new List<Guid>();
            double attendedCount = 0;
            double missedCount = 0;
            Guid currentUserGuid = Guid.Empty;

            foreach (var userGuid in uniqueUserGuids)
            {
                var userAttendanceRecords = _remoteDatabaseContext.PresenceDaos
                    .Where(p => p.UserGuid == userGuid);

                foreach (var record in userAttendanceRecords)
                {
                    currentUserGuid = record.UserGuid;

                    if (!processedUserGuids.Contains(currentUserGuid))
                    {
                        missedCount = 0;
                        attendedCount = 0;
                        processedUserGuids.Add(currentUserGuid);
                        attendanceSummaryList.Add(new AttendanceSummary { UserGuid = currentUserGuid, Attended = attendedCount, Missed = missedCount });

                        if (record.IsAttedance)
                        {
                            attendanceSummaryList.First(a => a.UserGuid == currentUserGuid).Attended = attendedCount += 1;
                        }
                        else
                        {
                            attendanceSummaryList.First(a => a.UserGuid == currentUserGuid).Missed = missedCount += 1;
                        }
                    }
                    else
                    {
                        if (record.IsAttedance)
                        {
                            attendanceSummaryList.First(a => a.UserGuid == currentUserGuid).Attended = attendedCount += 1;
                        }
                        else
                        {
                            attendanceSummaryList.First(a => a.UserGuid == currentUserGuid).Missed = missedCount += 1;
                        }
                    }
                }
            }

            foreach (var summary in attendanceSummaryList)
            {
                double attendancePercentage = summary.Attended / (summary.Missed + summary.Attended) * 100;

                if (attendancePercentage < 40)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                }

                Console.WriteLine($"ID Пользователя: {summary.UserGuid}, " +
                                  $"Посетил: {summary.Attended}, " +
                                  $"Пропустил: {summary.Missed}, " +
                                  $"Процент посещаемости: {attendancePercentage}%");
                Console.ForegroundColor = ConsoleColor.White;
            }
        }

     
        public class AttendanceSummary
        {
            public Guid UserGuid { get; set; }
            public double Attended { get; set; }
            public double Missed { get; set; }
        }
    }
}