require 'test_helper'

class Character < ActiveRecord::Base

  ABILITIES = ['Strength', 'Dexterity', 'Constitution', 'Intelligence', 'Wisdom', 'Charisma']

  # Automatically generate xxx_modifier methods for each ability
  ABILITIES.map{|ability| ability.downcase}.each do |a|
    Character.send(:define_method, "#{a}_modifier") do
      score = read_attribute(a.to_sym)
      Character.ability_modifier_for(score)
    end
  end

  def self.ability_modifier_for(ability_score)
    (ability_score - 10) / 2
  end

end


class CharacterTest < ActiveSupport::TestCase

  def test_ability_modifier
    assert_equal(-3, Character.ability_modifier_for(4))
    assert_equal(-1, Character.ability_modifier_for(8))
    assert_equal(-1, Character.ability_modifier_for(9))
    assert_equal(0, Character.ability_modifier_for(10))
    assert_equal(0, Character.ability_modifier_for(11))
    assert_equal(1, Character.ability_modifier_for(12))
    assert_equal(1, Character.ability_modifier_for(13))
    assert_equal(4, Character.ability_modifier_for(18))
  end

  def test_generated_ability_modifier_methods
    c = Character.new
    Character::ABILITIES.map {|a| a.downcase }.each do |ability|
      c.instance_eval("#{ability}= 12")
      assert_equal(12, c.instance_eval("#{ability}"))
      puts c.instance_eval("#{ability}")
      assert_equal(1, c.send("#{ability}_modifier".to_sym))
    end
  end

end