public class TaskService : CrudService<Task, int, TaskReadModel, TaskModel, TaskFilteredPagedQueryModel>,
  ITaskService
{
    private readonly IMapper _mapper;

    public TaskService(CrudServiceDependency dependency, IMapper mapper) : base(dependency)
    {
        _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
    }

    protected override IQueryable<TaskReadModel> BuildReadQuery(TaskFilteredPagedQueryModel model)
    {
        return EntitySet.AsNoTracking()
                    .WhereIf(model.State.HasValue, t => t.State == model.State)
                    .ProjectTo<TaskReadModel>(_mapper.ConfigurationProvider);
    }

    protected override Task MapToEntity(TaskModel model)
    {
        return _mapper.Map<Task>(model);
    }

    protected override TaskModel MapToModel(Task entity)
    {
        return _mapper.Map<TaskModel>(entity);
    }
}

    public class UserModel : MasterModel
    {
        public string UserName { get; set; }
        public string DisplayName { get; set; }
        public string Password { get; set; }
        public bool IsActive { get; set; }
        public ICollection<UserRoleModel> Roles { get; set; } = new HashSet<UserRoleModel>();
        public ICollection<PermissionModel> Permissions { get; set; } = new HashSet<PermissionModel>();
        public ICollection<PermissionModel> IgnoredPermissions { get; set; } = new HashSet<PermissionModel>();
    }

public class PermissionModel : DetailModel<int>
{
    public string Name { get; set; }
}

public class UserRoleModel : DetailModel<int>
{
    public long RoleId { get; set; }
}

public class UserValidator : FluentModelValidator<UserModel>
{
    private readonly IUnitOfWork _uow;

    public UserValidator(IUnitOfWork uow, IMessageLocalizer localizer)
    {
        _uow = uow ?? throw new ArgumentNullException(nameof(uow));

        RuleFor(m => m.DisplayName).NotEmpty()
            .WithMessage(localizer["User.Fields.DisplayName.Required"])
            .MinimumLength(3)
            .WithMessage(localizer["User.Fields.DisplayName.MinimumLength"])
            .MaximumLength(User.MaxDisplayNameLength)
            .WithMessage(localizer["User.Fields.DisplayName.MaximumLength"])
            .Matches(@"^[\u0600-\u06FF,\u0590-\u05FF,0-9\s]*$")
            .WithMessage(localizer["User.Fields.DisplayName.RegularExpression"])
            .DependentRules(() =>
            {
                RuleFor(m => m).Must(model =>
                     !CheckDuplicateDisplayName(model.DisplayName, model.Id))
                    .WithMessage(localizer["User.Fields.DisplayName.Unique"])
                    .OverridePropertyName(nameof(UserModel.DisplayName));
            });

        RuleFor(m => m.UserName).NotEmpty()
            .WithMessage(localizer["User.Fields.UserName.Required"])
            .MinimumLength(3)
            .WithMessage(localizer["User.Fields.UserName.MinimumLength"])
            .MaximumLength(User.MaxUserNameLength)
            .WithMessage(localizer["User.Fields.UserName.MaximumLength"])
            .Matches("^[a-zA-Z0-9_]*$")
            .WithMessage(localizer["User.Fields.UserName.RegularExpression"])
            .DependentRules(() =>
            {
                RuleFor(m => m).Must(model =>
                     !CheckDuplicateUserName(model.UserName, model.Id))
                    .WithMessage(localizer["User.Fields.UserName.Unique"])
                    .OverridePropertyName(nameof(UserModel.UserName));
            });

        RuleFor(m => m.Password).NotEmpty()
            .WithMessage(localizer["User.Fields.Password.Required"])
            .When(m => m.IsNew, ApplyConditionTo.CurrentValidator)
            .MinimumLength(6)
            .WithMessage(localizer["User.Fields.Password.MinimumLength"])
            .MaximumLength(User.MaxPasswordLength)
            .WithMessage(localizer["User.Fields.Password.MaximumLength"]);

        RuleFor(m => m).Must(model => !CheckDuplicateRoles(model))
            .WithMessage(localizer["User.Fields.Roles.Unique"])
            .When(m => m.Roles != null && m.Roles.Any(r => !r.IsDeleted));
    }

    private bool CheckDuplicateUserName(string userName, long id)
    {
        var normalizedUserName = userName.ToUpperInvariant();
        return _uow.Set<User>().Any(u => u.NormalizedUserName == normalizedUserName && u.Id != id);
    }

    private bool CheckDuplicateDisplayName(string displayName, long id)
    {
        var normalizedDisplayName = displayName.NormalizePersianTitle();
        return _uow.Set<User>().Any(u => u.NormalizedDisplayName == normalizedDisplayName && u.Id != id);
    }

    private bool CheckDuplicateRoles(UserModel model)
    {
        var roles = model.Roles.Where(a => !a.IsDeleted);
        return roles.GroupBy(r => r.RoleId).Any(r => r.Count() > 1);
    }
}

private bool CheckDuplicateRoles(UserModel model)
{
    var roles = model.Roles.Where(a => !a.IsDeleted);
    return roles.GroupBy(r => r.RoleId).Any(r => r.Count() > 1);
}

public interface IUserService : ICrudService<long, UserReadModel, UserModel>
{
}

public class UserService : CrudService<User, long, UserReadModel, UserModel>, IUserService
{
    private readonly IUserManager _manager;

    public UserService(CrudServiceDependency dependency, IUserManager manager) : base(dependency)
    {
        _manager = manager ?? throw new ArgumentNullException(nameof(manager));
    }

    protected override IQueryable<User> BuildFindQuery()
    {
        return base.BuildFindQuery()
            .Include(u => u.Roles)
            .Include(u => u.Permissions);
    }

    protected override IQueryable<UserReadModel> BuildReadQuery(FilteredPagedQueryModel model)
    {
        return EntitySet.AsNoTracking().Select(u => new UserReadModel
        {
            Id = u.Id,
            RowVersion = u.RowVersion,
            IsActive = u.IsActive,
            UserName = u.UserName,
            DisplayName = u.DisplayName,
            LastLoggedInDateTime = u.LastLoggedInDateTime
        });
    }

    protected override User MapToEntity(UserModel model)
    {
        return new User
        {
            Id = model.Id,
            RowVersion = model.RowVersion,
            IsActive = model.IsActive,
            DisplayName = model.DisplayName,
            UserName = model.UserName,
            NormalizedUserName = model.UserName.ToUpperInvariant(),
            NormalizedDisplayName = model.DisplayName.NormalizePersianTitle(),
            Roles = model.Roles.Select(r => new UserRole
                {Id = r.Id, RoleId = r.RoleId, TrackingState = r.TrackingState}).ToList(),
            Permissions = model.Permissions.Select(p => new UserPermission
            {
                Id = p.Id,
                TrackingState = p.TrackingState,
                IsGranted = true,
                Name = p.Name
            }).Union(model.IgnoredPermissions.Select(p => new UserPermission
            {
                Id = p.Id,
                TrackingState = p.TrackingState,
                IsGranted = false,
                Name = p.Name
            })).ToList()
        };
    }

    protected override UserModel MapToModel(User entity)
    {
        return new UserModel
        {
            Id = entity.Id,
            RowVersion = entity.RowVersion,
            IsActive = entity.IsActive,
            DisplayName = entity.DisplayName,
            UserName = entity.UserName,
            Roles = entity.Roles.Select(r => new UserRoleModel
                {Id = r.Id, RoleId = r.RoleId, TrackingState = r.TrackingState}).ToList(),
            Permissions = entity.Permissions.Where(p => p.IsGranted).Select(p => new PermissionModel
            {
                Id = p.Id,
                TrackingState = p.TrackingState,
                Name = p.Name
            }).ToList(),
            IgnoredPermissions = entity.Permissions.Where(p => !p.IsGranted).Select(p => new PermissionModel
            {
                Id = p.Id,
                TrackingState = p.TrackingState,
                Name = p.Name
            }).ToList()
        };
    }

    protected override Task BeforeSaveAsync(IReadOnlyList<User> entities, List<UserModel> models)
    {
        ApplyPasswordHash(entities, models);
        ApplySerialNumber(entities, models);
        return base.BeforeSaveAsync(entities, models);
    }

    private void ApplySerialNumber(IEnumerable<User> entities, IReadOnlyList<UserModel> models)
    {
        var i = 0;
        foreach (var entity in entities)
        {
            var model = models[i++];

            if (model.IsNew || !model.IsActive || !model.Password.IsEmpty() ||
                model.Roles.Any(a => a.IsNew || a.IsDeleted) ||
                model.IgnoredPermissions.Any(p => p.IsDeleted || p.IsNew) ||
                model.Permissions.Any(p => p.IsDeleted || p.IsNew))
            {
                entity.SerialNumber = _manager.NewSerialNumber();
            }
            else
            {
                //prevent include SerialNumber in update query
                UnitOfWork.Entry(entity).Property(a => a.SerialNumber).IsModified = false;
            }
        }
    }

    private void ApplyPasswordHash(IEnumerable<User> entities, IReadOnlyList<UserModel> models)
    {
        var i = 0;
        foreach (var entity in entities)
        {
            var model = models[i++];
            if (model.IsNew || !model.Password.IsEmpty())
            {
                entity.PasswordHash = _manager.HashPassword(model.Password);
            }
            else
            {
                //prevent include PasswordHash in update query
                UnitOfWork.Entry(entity).Property(a => a.PasswordHash).IsModified = false;
            }
        }
    }
}

private void ApplySerialNumber(IEnumerable<User> entities, IReadOnlyList<UserModel> models)
{
    var i = 0;
    foreach (var entity in entities)
    {
        var model = models[i++];

        if (model.IsNew || !model.IsActive || !model.Password.IsEmpty() ||
            model.Roles.Any(a => a.IsNew || a.IsDeleted) ||
            model.IgnoredPermissions.Any(p => p.IsDeleted || p.IsNew) ||
            model.Permissions.Any(p => p.IsDeleted || p.IsNew))
        {
            entity.SerialNumber = _manager.NewSerialNumber();
        }
        else
        {
            //prevent include SerialNumber in update query
            UnitOfWork.Entry(entity).Property(a => a.SerialNumber).IsModified = false;
        }
    }
}

interface IContact
{
}

class PhoneNumber : IContact
{

    private string AreaCode { get; }
    private string Number { get; }

    public PhoneNumber(string areaCode, string number)
    {

        if (string.IsNullOrEmpty(areaCode))
            throw new ArgumentException(nameof(areaCode));
        if (string.IsNullOrEmpty(number))
            throw new ArgumentException(nameof(number));

        this.AreaCode = areaCode;
        this.Number = number;
    }
}

class EmailAddress : IContact
{
    private string Address { get; }

    public EmailAddress(string address)
    {
        if (string.IsNullOrEmpty(address))
            throw new ArgumentException(nameof(address));   

        this.Address = address;
    }
}