require 'rdf/4store'
require 'spira'

module R2RDF
  module ORM

    # class Person < Spira::Base
    # configure :base_uri => "http://example.org/example/people"

    # property :name, :predicate => FOAF.name, :type => String

    # end

    # class Observation < Spira::Base
    #   type RDF::URI.new('http://purl.org/linked-data/cube#Observation')
    #   property :label, predicate: RDFS.label

    # end
    QB ||= RDF::Vocabulary.new(RDF::URI.new('http://purl.org/linked-data/cube#'))

    class Component < Spira::Base
      type QB.ComponentSpecification
      property :dimension, predicate: QB.dimension # RDF::URI.new('http://purl.org/linked-data/cube#dimension')
      property :measure, predicate: QB.measure # RDF::URI.new('http://purl.org/linked-data/cube#measure')
    end

    class DataStructureDefinition < Spira::Base
      type QB.DataStructureDefinition
      has_many :component, predicate: QB.component
    end

    class DataSet < Spira::Base
      type QB.DataSet
      property :label, predicate: RDFS.label

    end

    class Dimension < Spira::Base
      type QB.DimensionProperty
      property :range, predicate: RDFS.range
      property :label, predicate: RDFS.label
    end

    class Measure < Spira::Base
      type QB.MeasureProperty
      property :label, predicate: RDFS.label
    end


    def load_repo(repo)
      raise "Not an RDF::Repository - #{repo}" unless repo.is_a? RDF::Repository
      Spira.add_repository :default, repo
    end

    def observation
      unless R2RDF::ORM.const_defined?("Observation")
        obs = Class.new(Spira::Base) do
          type RDF::URI.new('http://purl.org/linked-data/cube#Observation')

          property :structure, predicate: QB.dataSet

          ((Dimension.each.to_a | Measure.each.to_a) || []).each{|component|
            property strip_uri(component.subject.to_s), predicate: component.subject
          }
        end
        R2RDF::ORM.const_set("Observation",obs)
      end
      Observation
    end

    def reload_observation
      R2RDF::ORM.send(:remove_const, "Observation")
      observation
    end

    def strip_uri(uri)
      uri = uri.to_s.dup
      uri[-1] = '' if uri[-1] == '>'
      uri.to_s.split('/').last.split('#').last
    end
  end
end