module Model
  def self.included(base)
    base.extend(ClassMethods)
  end

  def self.my_attr_accessor(*attributes)
    attributes.each do |attribute|
      # Getter
      define_method attribute do
        instance_variable_get "@#{attribute}"
      end
      ########

      # Setter
      define_method "#{attribute}=" do |value|
        instance_variable_set "@#{attribute}", value
      end
      ########
    end
  end

  my_attr_accessor :id, :title, :body, :created_at, :published

  def initialize(params = {})
    @attributes = {}
    params.each do |key, value|
      key = key.to_sym
      @attributes[key] = value
    end
  end

  def attributes
    hash = {}
    @attributes.map do |key, value|
      hash[key] = value
    end
    hash
  end

  def attributes=(attributes)
    attributes.each do |key, value|
      @attributes[key.to_sym] = value
    end
  end

  module ClassMethods
    def attribute(name, *_options)
      case _options[0][:type]
      when :string
        define_method("#{name}=") do
          instance_variable_set "@#{name}", "@#{name}".to_s
        end
      when :integer
        define_method("#{name}=") do
          instance_variable_set "@#{name}", "@#{name}".to_i
        end
      when :boolean
        define_method("#{name}=") do
          instance_variable_set "@#{name}", !!"@#{name}"
        end
      when :datetime
        define_method("#{name}=") do
          instance_variable_set "@#{name}", DateTime.parse("@#{name}")
        end
      end
    end
  end
end