class Locale < ActiveRecord::Base
  validates_presence_of :code
  validates_uniqueness_of :code

  has_many :translations, :dependent => :destroy
  named_scope :non_defaults, :conditions => ["code != ?", I18n.default_locale.to_s]

  @@default_locale = nil

  def self.default_locale
    @@default_locale ||= self.find(:first, :conditions => {:code => I18n.default_locale.to_s})
  end

  def self.reset_default_locale
    @@default_locale = nil
  end

  def translation_from_key(key)
    self.translations.find(:first, :conditions => {:key => Translation.hk(key)})
  end

  def create_translation(key, value, pluralization_index=1)
    conditions = {:key => key, :raw_key => key.to_s, :pluralization_index => pluralization_index}

    # set the key as the value if we're using the default locale and the key is a string
    conditions.merge!({:value => value}) if (self.code == I18n.default_locale.to_s && key.is_a?(String))
    translation = self.translations.create(conditions)

    # hackity hack.  bug #922 maybe?
    self.connection.commit_db_transaction unless RAILS_ENV['test']
    translation
  end

  def find_translation_or_copy_from_default_locale(key, pluralization_index)
    self.translations.find_by_key_and_pluralization_index(Translation.hk(key), pluralization_index) || copy_from_default(key, pluralization_index)
  end

  def copy_from_default(key, pluralization_index)
    if !self.default_locale? && Locale.default_locale.has_translation?(key, pluralization_index)
      create_translation(key, key, pluralization_index)
    end
  end

  def has_translation?(key, pluralization_index=1)
    self.translations.exists?(:key => Translation.hk(key), :pluralization_index => pluralization_index)
  end

  def percentage_translated
    (self.translations.translated.count.to_f / self.translations.count.to_f * 100).round rescue 100
  end

  def self.available_locales
    all.map(&:code).map(&:to_sym) rescue []
  end

  def default_locale?
    self == Locale.default_locale
  end

  def to_param
    self.code
  end
end
