require 'ostruct'

class Column
  attr_accessor :name, :type, :limit#, :precision, :scale

  def initialize(attrs={})
    self.name  = attrs[:name]
    self.type  = attrs[:type]
    self.limit = attrs[:limit]
  end
end

class User < OpenStruct
  attr_reader :id

  def initialize(attributes={})
    @id = attributes.delete(:id)
    super
  end

  def new_record!
    @new_record = true
  end

  def new_record?
    @new_record || false
  end

  def column_for_attribute(attribute)
    column_type, limit = case attribute.to_sym
      when :name, :status, :password then [:string, 100]
      when :description   then :text
      when :age           then :integer
      when :credit_limit  then [:decimal, 15]
      when :active        then :boolean
      when :born_at       then :date
      when :delivery_time then :time
      when :created_at    then :datetime
      when :updated_at    then :timestamp
    end
    Column.new(:name => attribute, :type => column_type, :limit => limit)
  end

  def self.human_attribute_name(attribute)
    case attribute
      when 'name' then 'Super User Name!'
      when 'description' then 'User Description!'
      else nil
    end
  end

  def self.human_name
    "User"
  end

  def errors
    @errors ||= {
      :name => "can't be blank",
      :description => "must be longer than 15 characters",
      :age => ["is not a number", "must be greater than 18"],
    }
  end
end