class NewSupplier
  include ActiveAttr::Model
  attr_accessor :current_employee
  attr_reader :employee, :supplier

  attribute :supplier_name
  attribute :email
  attribute :password
  attribute :password_confirmation

  without_current_employee = { unless: 'current_employee.present?' }
  validates :supplier_name, presence: true
  validates :email, email: without_current_employee
  validates :password, presence: without_current_employee, confirmation: without_current_employee

  validate :supplier_name_uniqueness
  validate :employee_uniqueness_or_existence

  def save
    if valid?
      persist!
      true
    else
      false
    end
  end

  private

  def persist!
    @employee ||= Employee.new email: email, password: password, password_confirmation: password_confirmation
    raise "Cannot create employee with #{attributes.inspect}" unless employee.save
    @supplier = Supplier.create name: supplier_name
    supplier.add_manager employee
  end

  def employee_uniqueness_or_existence
    return if current_employee.present?
    if Employee.count_by_email(email) > 0
      employee = Employee.find_by_email(email)
      if employee.valid_password? password
        @employee = employee
      else
        errors.add :email, :taken
      end
    end
  end

  def supplier_name_uniqueness
    return unless current_employee.present? and supplier_name.present?
    current_suppliers = current_employee.suppliers
    errors.add :base, 'You already have a supplier with that name' if current_suppliers.map(&:name).include? supplier_name
  end
end