using Demo.Data.RemoteData.RemoteDataBase;
using Demo.Data.RemoteData.RemoteDataBase.DAO;
using System;
using System.Collections.Generic;
using System.Linq;
using Demo.domain.Models;

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

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

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

        public void AddPresence(PresenceLocalEntity presence)
        {
            if (presence == null) throw new ArgumentNullException(nameof(presence));

            var newPresence = new PresenceDao
            {
                Date = DateOnly.FromDateTime(presence.Date),
                UserGuid = presence.UserGuid,
                LessonNumber = presence.LessonNumber,
                IsAttedance = presence.IsAttedance
            };
            _remoteDatabaseContext.PresenceDaos.Add(newPresence);
        }

        public List<PresenceLocalEntity> GetPresenceByGroup(int groupId)
        {
            return _remoteDatabaseContext.PresenceDaos
                .Where(p => p.UserDao != null && p.UserDao.GroupID == groupId) // Проверяем на null перед использованием
                .Select(p => new PresenceLocalEntity
                {
                    Date = p.Date.ToDateTime(TimeOnly.MinValue),
                    UserGuid = p.UserGuid,
                    LessonNumber = p.LessonNumber,
                    IsAttedance = p.IsAttedance
                })
                .ToList();
        }

        public List<PresenceLocalEntity> GetPresenceByGroupAndDate(int groupId, DateTime date)
        {
            return _remoteDatabaseContext.PresenceDaos
                .Where(p => p.UserDao != null && p.UserDao.GroupID == groupId && p.Date == DateOnly.FromDateTime(date))
                .Select(p => new PresenceLocalEntity
                {
                    Date = p.Date.ToDateTime(TimeOnly.MinValue),
                    UserGuid = p.UserGuid,
                    LessonNumber = p.LessonNumber,
                    IsAttedance = p.IsAttedance
                })
                .ToList();
        }

        public void MarkUserAsAbsent(Guid userGuid, int groupId, int firstLessonNumber, int lastLessonNumber)
        {
            foreach (var lesson in Enumerable.Range(firstLessonNumber, lastLessonNumber - firstLessonNumber + 1))
            {
                var presence = _remoteDatabaseContext.PresenceDaos.FirstOrDefault(p =>
                    p.UserGuid == userGuid &&
                    p.UserDao != null && p.UserDao.GroupID == groupId &&
                    p.LessonNumber == lesson);

                if (presence != null)
                {
                    presence.IsAttedance = false; // Помечаем как отсутствующего
                }
            }
        }
    }
}