require 'erb'
module Exlibris
  module Primo
    #
    # Specify global configuration settings for
    #
    module Config
      class << self
        include WriteAttributes
        attr_accessor :base_url, :proxy_url, :institution, :institutions, :libraries, :availability_statuses, :sources,
          :facet_labels, :facet_top_level, :facet_collections, :facet_resource_types, :load_time

        def load_yaml file
          write_attributes YAML.load(ERB.new(File.read(file)).result)
          self.load_time = Time.now
        end
      end

      #
      # These attributes default to the global config settings if not
      # specified locally.
      #
      module Attributes
        def config
          @config ||= Config
        end

        def base_url
          @base_url ||= String.new config.base_url.to_s
        end

        def proxy_url
          @proxy_url ||= config.proxy_url
        end

        def institution
          @institution ||= String.new config.institution.to_s
        end

        def institutions
          @institutions ||= (config.institutions) ? config.institutions.dup : {}
        end

        def libraries
          @libraries ||= (config.libraries) ? config.libraries.dup : {}
        end

        def availability_statuses
          @availability_statuses ||= (config.availability_statuses) ? config.availability_statuses.dup : {}
        end

        def sources
          @sources ||= (config.sources) ? config.sources.dup : {}
        end

        def facet_labels
          @facet_labels ||= (config.facet_labels) ? config.facet_labels.dup : {}
        end

        def facet_top_level
          @facet_top_level ||= (config.facet_top_level) ? config.facet_top_level.dup : {}
        end

        def facet_collections
          @facet_collections ||= (config.facet_collections) ? config.facet_collections.dup : {}
        end

        def facet_resource_types
          @facet_resource_types ||= (config.facet_resource_types) ? config.facet_resource_types.dup : {}
        end
      end
    end
  end
end