using Demo.Data.Repository;
using Demo.domain.Models;

namespace Demo.Domain.UseCase
{
    public class PresenceUseCase : IPresenceUseCase
    {
        private readonly IUserRepository _repositoryUserImpl;
        private readonly IPresenceRepository _repositoryPresenceImpl;
        private readonly IGroupRepository _repositoryGroupImpl;

        public PresenceUseCase(IPresenceRepository presenceRepository, IUserRepository repositoryUserImpl, IGroupRepository repositoryGroupImpl)
        {
            _repositoryPresenceImpl = presenceRepository;
            _repositoryGroupImpl = repositoryGroupImpl;
            _repositoryUserImpl = repositoryUserImpl;
        }

        public List<Presence> GetPresencesByGroup(int groupId)
        {
            var usersByGroup = _repositoryUserImpl.GetAllUser()
            .Where(user => user.GroupID == groupId).ToList();

            var presenceByGroup = _repositoryPresenceImpl.GetPresencesByGroup()
            .Where(x => usersByGroup.Any(user => user.Guid == x.UserGuid))
            .Select(presence => new Presence{
                User = new User{
                    Guid = presence.UserGuid,
                    Group = new Group{
                        Id = groupId,
                        Name = _repositoryGroupImpl.GetAllGroup().First(group => group.Id == groupId).Name
                    },
                    FIO = usersByGroup.First(user => user.Guid == presence.UserGuid).FIO, 
                },
                LessonNumber = presence.LessonNumber,
                Date = presence.Date,
                IsAttedance = presence.IsAttedance
            }).ToList();

            return presenceByGroup;
        }

        public List<Presence> GetPresencesByGroupAndDate(int groupId, DateOnly date)
        {
            var usersByGroup = _repositoryUserImpl.GetAllUser()
            .Where(user => user.GroupID == groupId).ToList();

            var presenceByGroupAndDate = _repositoryPresenceImpl.GetPresencesByGroup()
            .Where(x => usersByGroup.Any(user => user.Guid == x.UserGuid && x.Date == date))
            .Select(presence => new Presence{
                User = new User{
                    Guid = presence.UserGuid,
                    Group = new Group{
                        Id = groupId,
                        Name = _repositoryGroupImpl.GetAllGroup().First(group => group.Id == groupId).Name
                    },
                    FIO = usersByGroup.First(user => user.Guid == presence.UserGuid).FIO, 
                },
                LessonNumber = presence.LessonNumber,
                Date = presence.Date,
                IsAttedance = presence.IsAttedance
            }).ToList();

            return presenceByGroupAndDate;
        }

        public bool UpdateAttedance(int firstLesson, int lastLesson, DateOnly date, Guid UserGuid){
            _repositoryPresenceImpl.UpdateAttedance(firstLesson, lastLesson, date, UserGuid);
            return true;
        }

        public bool GeneratePresence(int firstLesson, int lastLesson, int groupId, DateOnly date){
            List<Presence> presenceList = new List<Presence>{};
            var usersByGroup = _repositoryUserImpl.GetAllUser().Where(x => x.GroupID == groupId);
            for (int i = firstLesson; i <= lastLesson; i++){
                foreach(UserLocalEntity user in usersByGroup){
                    presenceList.Add(new Presence{
                        User = new User{
                        Group = new Group{
                            Id = groupId,
                            Name = _repositoryGroupImpl.GetAllGroup().First(group => group.Id == groupId).Name
                        },
                        FIO = usersByGroup.First(user2 => user2.Guid == user.Guid).FIO, 
                        Guid = user.Guid
                    },
                    IsAttedance = true,
                    Date = date,
                    LessonNumber = i});
                }
            }

            var presenceLocalEntity = presenceList.Select(x => new PresenceLocalEntity{
                UserGuid = x.User.Guid,
                IsAttedance = x.IsAttedance,
                LessonNumber = x.LessonNumber,
                Date = x.Date
            }).ToList();

            _repositoryPresenceImpl.SavePresence(presenceLocalEntity);

            return true;
        }

        public bool GenerateWeekPresence(int firstLesson, int lastLesson, int groupId, DateOnly date){
            for (int i = 0; i < 8; i++){
                GeneratePresence(firstLesson, lastLesson, groupId, date.AddDays(i));
            }
            return true;
        }
    }
}