require 'spec_helper'

module DbdDataEngine
  describe Context do

    def assert_context_has_object(context, object)
      context.select{ |cf| cf.object.to_s == object }.size.should == 1
    end

    context 'default context does not yet exist' do

      let(:current_graph) do
        Dbd::Graph.new << Dbd::ContextFact.new(
          subject: Dbd::ContextFact.factory.new_subject,
          predicate: 'foo',
          object_type: 's',
          object: 'bar')
      end

      context 'default_from_params' do
        it 'returns public_today' do
          context = described_class.default_from_params('public today', current_graph)
          assert_context_has_object(context, 'public')
        end

        it 'returns personal_today' do
          context = described_class.default_from_params('personal today', current_graph)
          assert_context_has_object(context, 'personal')
        end

        it 'returns business_today' do
          context = described_class.default_from_params('business today', current_graph)
          assert_context_has_object(context, 'business')
        end

        it 'raises for inexisting param' do
          lambda{ described_class.default_from_params('foo', current_graph) }.should raise_error(/foo/)
        end
      end

      context 'public_today' do

        let(:context) { described_class.public_today }

        it 'exists' do
          context
        end

        it 'has 6 context_facts' do
          context.select{ |cf| cf.class == Dbd::ContextFact }.size.should == 6
        end

        it 'has a public object' do
          assert_context_has_object(context, 'public')
        end
      end

      context 'personal_today' do

        let(:context) { described_class.personal_today }

        it "exists" do
          context
        end

        it "has 6 context_facts" do
          context.select{ |cf| cf.class == Dbd::ContextFact}.size.should == 6
        end

        it 'has a personal object' do
          assert_context_has_object(context, 'personal')
        end
      end

      context 'business_today' do

        let(:context) { described_class.business_today }

        it "exists" do
          context
        end

        it "has 6 context_facts" do
          context.select{ |cf| cf.class == Dbd::ContextFact}.size.should == 6
        end

        it 'has a business object' do
          assert_context_has_object(context, 'business')
        end
      end
    end

    context 'default context does already exist' do

      let(:public_today)   { described_class.public_today }
      let(:personal_today) { described_class.personal_today }
      let(:business_today) { described_class.business_today }

      let(:current_graph) do
        Dbd::Graph.new.tap do |graph|
          graph << public_today
          graph << personal_today
          graph << business_today
        end
      end

      context 'default_from_params' do
        it 'returns the _existing_ public_today' do
          context = described_class.default_from_params('public today', current_graph)
          context.subject.should == public_today.subject
        end
        it 'returns the _existing_ personal_today' do
          context = described_class.default_from_params('personal today', current_graph)
          context.subject.should == personal_today.subject
        end
        it 'returns the _existing_ business_today' do
          context = described_class.default_from_params('business today', current_graph)
          context.subject.should == business_today.subject
        end
      end
    end
  end
end