require "rails_connector/blob"

module RailsConnector

  # @api public
  class Configuration
    #
    # Default path of a CA certification file in PEM format.
    #
    # @api public
    DEFAULT_CA_FILE = File.expand_path('../../../config/ca-bundle.crt', __FILE__)

    class << self

      # Determine if current visitor is permitted to edit content.
      attr_accessor :editing_auth_callback

      # Configure a callback to be invoked when the rails connector determines,
      # if current visitor is permitted to edit content.
      # Default is <code>false</code>.
      #
      # Example Usage:
      #     RailsConnector::Configuation.editing_auth do |env|
      #       request = Rack::Request.new(env)
      #       # return truey if current visitor is permitted to edit content, falsy otherwise
      #     end
      # @api public
      def editing_auth(&block)
        if block.respond_to?(:arity) && block.arity == 1
          self.editing_auth_callback = block
        else
          raise ArgumentError, 'editing_auth should have only one attribute!'
        end
      end

      # TODO: Legacy compatiblity. Remove when DisplayHelper gets removed.
      def editor_interface_enabled?
        false
      end

      # The +RailsConnector+ makes heavy use of filesystem caching.
      # Use this method to configure the directory that should be used to store cached data.
      # By default, +RAILS_ROOT/tmp/infopark_cache+ will be used.
      # @param path [String] Path to directory that should be used to store cached data.
      # @example Configure +RailsConnector+ to store its cache under +/tmp/my_cache+.
      #     RailsConnector::Configuration.cache_path = '/tmp/my_cache'
      # @api public
      def cache_path=(path)
        CmsCacheStorage.backend_cache = ActiveSupport::Cache::FileStore.new(path)
      end

      # Gets path of a CA certification file in PEM format.
      # @api public
      attr_reader :ca_file

      # Sets path of a CA certification file in PEM format.
      # The file can contain several CA certificates.
      # Certifications will be used for endpoint peer verification of various Infopark services
      # e.g. Content Read Service.
      # @api public
      def ca_file=(path)
        File.read(path) if path # Try to read the given file and fail if it doesn't exist or is not readable.
        @ca_file = path
      end

      # Configuration for Content Read Service API.
      # @api public
      def content_service_url
        content_service.url
      end

      # Set url configuration for Content Read Service API.
      # @api public
      def content_service_url=(value)
        content_service.url = value
      end

      # Configuration for Content Read Service API.
      # @api public
      def content_service_login
        content_service.login
      end

      # Set login configuration for Content Read Service API.
      # @api public
      def content_service_login=(value)
        content_service.login = value
      end

      # Configuration for Content Read Service API.
      # @api public
      def content_service_api_key
        content_service.api_key
      end

      # Set API key configuration for Content Read Service API.
      # @api public
      def content_service_api_key=(value)
        content_service.api_key = value
      end

      # Url configuration for CMS Rest API.
      # @api public
      def cms_url
        cms_api.url
      end

      # Set url configuration for CMS Rest API.
      # @api public
      def cms_url=(value)
        cms_api.url = value
      end

      # Login configuration for CMS Rest API.
      # @api public
      def cms_login
        cms_api.login
      end

      # Set login configuration for CMS Rest API.
      # @api public
      def cms_login=(value)
        cms_api.login = value
      end

      # API key configuration for CMS Rest API.
      # @api public
      def cms_api_key
        cms_api.api_key
      end

      # Set API key configuration for CMS Rest API.
      # @api public
      def cms_api_key=(value)
        cms_api.api_key = value
      end

      def to_prepare
        unless Rails.configuration.cache_classes
          NamedLink.reset_cache
          BasicObj.reset_type_computer!
          BasicWidget.reset_type_computer!
          ::ApplicationController.__send__(:helper, :cms)
        end
      end

      def configure_cms_database
      end

      attr_accessor :choose_homepage_callback

      # Configure a callback to be invoked when the rails connector delivers the homepage.
      # The given callback will receive the rack env
      # and must return an {BasicObj Obj} to be used as the homepage.
      # If no callback is configured, {BasicObj.homepage Obj.homepage} will be used as the default.
      # @api public
      def choose_homepage(&block)
        self.choose_homepage_callback = block
      end

      def cms_routes(*args)
        raise <<-EOS.gsub(/\s+/, ' ')
        Calling RailsConnector::Configuration.cms_routes is not needed anymore.
        Please remove it from config/routes.rb
        EOS
      end

      def use_x_sendfile=(value)
        raise 'Configuration.use_x_sendfile is now available as Rails configuration:'\
              ' config.action_dispatch.x_sendfile_header = "X-Sendfile"'
      end

      private

      def content_service
        RailsConnector::ContentService.configuration
      end

      def cms_api
        RailsConnector::CmsRestApi.configuration
      end
    end

    # defaults
    self.ca_file = DEFAULT_CA_FILE
    self.editing_auth{ |env| false }
  end

  class ConfigurationError < StandardError
  end
end