using Zurnal.Data.Repository;
using Zurnal.Date.Repository;
using Zurnal.domain.Models;
using Zurnal.RemaDateBase.DateDao;

namespace Zurnal.Domain.UseCase
{
    public class UserUseCase : IGroupRepository
    {
        private readonly UserRepositoryImpl _repositoryUserImpl;
        internal IGroupRepository RepositoryGroupImpl { get; }

        public UserUseCase(UserRepositoryImpl repositoryImpl, GroupRepositoryImpl repositoryGroupImpl)
        {
            _repositoryUserImpl = repositoryImpl;
            RepositoryGroupImpl = (IGroupRepository?)(repositoryGroupImpl ?? throw new ArgumentNullException(nameof(repositoryGroupImpl)));
        }

        public List<User> GetAllUsers() => _repositoryUserImpl.GetAllUsersList()
            .Join(RepositoryGroupImpl.AllGroup,
            user => user.GroupID,
            group => group.Id,
            (user, group) => 
            new User { FIO = user.FIO, 
                Guid = user.Guid, 
                Group = new Group { Id = group.Id, Name = group.GroupName } }
            ).ToList();

        public bool RemoveUserByGuid(Guid userGuid) 
        {
            return _repositoryUserImpl.RemoveUserByGuid(userGuid);
        }

        public User UpdateUser(User user, int groupId)
{
    UserLocalEntity userLocalEntity = new UserLocalEntity { FIO = user.FIO, GroupID = groupId, Guid = user.Guid };
    UserLocalEntity? result = _repositoryUserImpl.UpdateUser(userLocalEntity);
    if (result == null) throw new Exception("User update failed.");
    Group? group = GetAllGroups().FirstOrDefault(it => it.Id == result.GroupID);
    if (group == null) throw new Exception("Group not found.");
    return new User { FIO = user.FIO, Guid = user.Guid, Group = group };
}

        private List<Group> GetAllGroups()
{
    return RepositoryGroupImpl.AllGroup.Select(g => new Group { Id = g.Id, Name = g.GroupName }).ToList();
}

        public User FindUserByGuid(Guid userGuid)
        {
            var user = _repositoryUserImpl.GetAllUsersList().FirstOrDefault(u => u.Guid == userGuid);
            if (user == null) throw new Exception("Пользователь не найден.");
            var group = RepositoryGroupImpl.AllGroup.FirstOrDefault(g => g.Id == user.GroupID);
            return new User { FIO = user.FIO, Guid = user.Guid, Group = group };
        }

        public List<Group> AllGroup => new List<Group>();
        List<GroupDao> IGroupRepository.AllGroup => throw new NotImplementedException();

        IEnumerable<System.Text.RegularExpressions.Group> IGroupRepository.AllGroups()
        {
            return (IEnumerable<System.Text.RegularExpressions.Group>)((IGroupRepository)_repositoryUserImpl).GetAllGroups();
        }

        public bool RemoveGroupById(int groupID)
        {
            throw new NotImplementedException();
        }

        public bool UpdateGroupById(int groupID, GroupDao updatedGroup)
        {
            throw new NotImplementedException();
        }

        public bool AddGroup(GroupDao newGroup)
        {
            throw new NotImplementedException();
        }

        public void AddGroupFromRegex(System.Text.RegularExpressions.Group group)
        {
            throw new NotImplementedException();
        }

        public GroupDao GetGroupById(int id)
        {
            throw new NotImplementedException();
        }

        IEnumerable<GroupDao> IGroupRepository.GetAllGroups()
        {
            throw new NotImplementedException();
        }

        public void UpdateGroup(GroupDao group)
        {
            throw new NotImplementedException();
        }

        public void DeleteGroup(int id)
        {
            throw new NotImplementedException();
        }

        internal class UserLocalEntity 
        {
            public string FIO { get; set; }
            public int GroupID { get; set; }
            public Guid Guid { get; set; }
        }
    }
}