module FantasyIdentifiable

# File lib/fantasy_identifiable.rb, line 64
def friendly_token(length = 20)
  # To calculate real characters, we must perform this operation.
  # See SecureRandom.urlsafe_base64
  rlength = (length * 3) / 4
  SecureRandom.urlsafe_base64(rlength).tr('lIO0', 'sxyz')
end

# File lib/fantasy_identifiable.rb, line 15
def generate_identifiers
  self.class.identifier_fields.each do |field_name, field_type|
    case field_type
    when :friendly
      set_friendly_identifier field_name
    when :fantasy
      set_fantasy_identifier field_name
    else
      set_uuid_identifier field_name
    end
  end
end

# File lib/fantasy_identifiable.rb, line 31
def identifiable(fields)
  @identifier_fields = fields
end

# File lib/fantasy_identifiable.rb, line 36
def identifier_with(field_name, &block)
  loop do
    new_id = block.call
    if self.class.where("#{field_name} LIKE ?", new_id).empty?
      send("#{field_name}=", new_id)
      break
    end
  end
end

# File lib/fantasy_identifiable.rb, line 71
def random_fantasy_identifier
  (
    (
      Faker::Hipster.words(number: 4) +
      [
        Faker::TvShows::Stargate.planet,
        Faker::TvShows::GameOfThrones.city,
        Faker::TvShows::GameOfThrones.dragon,
        Faker::Movies::HitchhikersGuideToTheGalaxy.planet,
        Faker::Creature::Animal.name,
        Faker::Creature::Cat.name,
        Faker::Creature::Dog.name,
        Faker::Fantasy::Tolkien.race,
        Faker::Books::Dune.city,
        Faker::Books::Dune.planet,
        Faker::Verb.past,
        Faker::Science.element,
        Faker::Name.first_name,
        Faker::Job.key_skill,
        Faker::Hacker.noun
      ]
    ).sample(3) +
    [friendly_token(3).downcase.tr("-_", "ab")]
  ).join("-").delete(" ").downcase.gsub(/[^\-0-9A-Za-z]/, '')
end

# File lib/fantasy_identifiable.rb, line 46
def set_fantasy_identifier field_name
  identifier_with(field_name) do
    random_fantasy_identifier
  end
end

# File lib/fantasy_identifiable.rb, line 52
def set_friendly_identifier field_name
  identifier_with(field_name) do
    friendly_token(20).downcase.tr("-_", "ab")
  end
end

# File lib/fantasy_identifiable.rb, line 58
def set_uuid_identifier field_name
  identifier_with(field_name) do
    SecureRandom.uuid
  end
end