foodcoop-adam/foodsoft

# -*- encoding : utf-8 -*-
module Foodsoft::ControllerExtensions
  module Locale
    extend ActiveSupport::Concern

    included do
      before_filter :set_locale
    end

    def explicitly_requested_language
      params[:locale]
    end

    def user_settings_language
      current_user.locale if current_user
    end

    def session_language
      session[:locale]
    end

    def browser_language
      request.env['HTTP_ACCEPT_LANGUAGE'] ? request.env['HTTP_ACCEPT_LANGUAGE'].scan(/^[a-z]{2}/).first : nil
    end

    def default_language
      FoodsoftConfig[:default_locale] or ::I18n.default_locale
    end

    protected

    def select_language_according_to_priority
      language = explicitly_requested_language || session_language || user_settings_language
      language ||= browser_language unless FoodsoftConfig[:ignore_browser_locale]
      language.to_sym unless language.blank?
    end

    def available_locales
      ::I18n.available_locales
    end

    def set_locale
      if available_locales.include?(select_language_according_to_priority)
        ::I18n.locale = select_language_according_to_priority
      else
        ::I18n.locale = default_language
      end

      locale = session[:locale] = ::I18n.locale
      logger.info("Set locale to #{locale}")
    end

  end
end