base_class.rb

require 'pry'

# TASK: Implement this class to make tests pass
class BaseClass
  attr_reader :errors
  VALIDATORS = %i[presence_of_validator numericality_validator].freeze

  def self.validates_presence_of(name)
    @presence_of_attr = name
  end

  def self.validates_numericality_of(name)
    @numericality_of_attr = name
  end

  def valid?
    @errors = []
    invoke_all_validators
    @errors.empty?
  end

  private

  def invoke_all_validators
    VALIDATORS.each { |validator_method |self.send(validator_method)}
  end

  def presence_of_validator
    attr_name = self.class.instance_variable_get(:@presence_of_attr)
    @errors.push("#{attr_name} can't be blank") if self.public_send(attr_name).nil? || self.public_send(attr_name).empty?
  end

  def numericality_validator
    attr_name = self.class.instance_variable_get(:@numericality_of_attr)
    @errors.push("#{attr_name} must be number") if !self.public_send(attr_name).is_a? Numeric
  end

end