require 'test_helper'

module Vedeu

  describe Buffer do

    let(:described)  { Vedeu::Buffer }
    let(:instance)   { described.new(attributes) }
    let(:attributes) {
      {
        name:     _name,
        back:     back,
        front:    front,
        previous: previous,
      }
    }
    let(:_name)     { 'krypton' }
    let(:back)      {}
    let(:front)     {}
    let(:previous)  {}
    let(:interface) {}

    describe '#initialize' do
      it { instance.must_be_instance_of(described) }
      it { instance.instance_variable_get('@name').must_equal(_name) }
      it { instance.instance_variable_get('@back').must_equal(back) }
      it { instance.instance_variable_get('@front').must_equal(front) }
      it { instance.instance_variable_get('@previous').must_equal(previous) }
      it do
        instance.instance_variable_get('@repository').must_equal(Vedeu.buffers)
      end
    end

    describe 'accessors' do
      it { instance.must_respond_to(:back) }
      it { instance.must_respond_to(:back=) }
      it { instance.must_respond_to(:front) }
      it { instance.must_respond_to(:front=) }
      it { instance.must_respond_to(:previous) }
      it { instance.must_respond_to(:previous=) }
      it { instance.must_respond_to(:name) }
    end

    describe '#add' do
      let(:back) {
        Vedeu.interface 'buffer' do
          lines do
            line 'old_back'
          end
        end
      }
      let(:content) {
        Vedeu.interface 'buffer' do
          lines do
            line 'new_back'
          end
        end
      }

      before { Vedeu.stubs(:trigger) }
      after { Vedeu.interfaces.reset }

      subject { instance.add(content) }

      it { subject.must_equal(true) }

      it 'replaces the back buffer with the content' do
        instance.back.must_equal(back)

        subject

        instance.back.must_equal(content)
      end
    end

    describe '#back?' do
      before { Vedeu.stubs(:trigger) }
      after { Vedeu.interfaces.reset }

      subject { instance.back? }

      context 'with content' do
        let(:back) {
          Vedeu.interface 'back' do
            lines do
              line 'back content'
            end
          end
        }

        it { subject.must_equal(true) }
      end

      context 'without content' do
        it { subject.must_equal(false) }
      end
    end

    describe '#front?' do
      before { Vedeu.stubs(:trigger) }
      after { Vedeu.interfaces.reset }

      subject { instance.front? }

      context 'with content' do
        let(:front) {
          Vedeu.interface 'front' do
            lines do
              line 'front content'
            end
          end
        }
        it { subject.must_equal(true) }
      end

      context 'without content' do
        it { subject.must_equal(false) }
      end
    end

    describe '#previous?' do
      before { Vedeu.stubs(:trigger) }
      after { Vedeu.interfaces.reset }

      subject { instance.previous? }

      context 'with content' do
        let(:previous) {
          Vedeu.interface 'previous' do
            lines do
              line 'previous content'
            end
          end
        }

        it { subject.must_equal(true) }
      end

      context 'without content' do
        it { subject.must_equal(false) }
      end
    end

    describe '#hide' do
      before { Vedeu::Output.stubs(:render) }

      subject { instance.hide }

      it {
        Vedeu::Output.expects(:render)
        subject
      }
    end

    describe '#show' do
      before { Vedeu::Output.stubs(:render) }

      subject { instance.show }

      it {
        Vedeu::Output.expects(:render)
        subject
      }
    end

    describe '#render' do
      before { Vedeu::Output.stubs(:render) }

      subject { instance.render }

      it {
        Vedeu::Output.expects(:render)
        subject
      }

      # @todo Add more tests.
      # it { skip }
      # it { subject.must_be_instance_of(Array) }

      # context 'when there is content on the back buffer' do
      #   let(:back) {
      #     Vedeu.interface 'buffer' do
      #       lines do
      #         line 'old_back'
      #       end
      #     end
      #   }
      #   let(:front) {
      #     Vedeu.interface 'buffer' do
      #       lines do
      #         line 'front'
      #       end
      #     end
      #   }
      #   let(:previous) {
      #     Vedeu.interface 'buffer' do
      #       lines do
      #         line 'previous'
      #       end
      #     end
      #   }
      #   let(:buffer) { :back }

      #   it { subject.must_equal([back]) }

      #   it 'replaces the previous buffer with the front buffer' do
      #     subject
      #     instance.previous.must_equal(front)
      #   end

      #   it 'replaces the front buffer with the back buffer' do
      #     subject
      #     instance.front.must_equal(back)
      #   end

      #   it 'replaces the back buffer with an empty buffer' do
      #     subject
      #     instance.back.must_equal(nil)
      #   end
      # end

      # context 'when there is no content on the back buffer' do
      #   let(:buffer) { :back }

      #   it { subject.must_equal([]) }
      # end

      # context 'when there is content on the front buffer' do
      #   let(:buffer) { :front }
      #   let(:front) {
      #     Vedeu.interface 'buffer' do
      #       lines do
      #         line 'front'
      #       end
      #     end
      #   }

      #   it { subject.must_equal([front]) }
      # end

      # context 'when there is no content on the front buffer' do
      #   let(:buffer) { :front }

      #   it { subject.must_equal([]) }
      # end

      # context 'when there is content on the previous buffer' do
      #   let(:buffer) { :previous }
      #   let(:previous) {
      #     Vedeu.interface 'buffer' do
      #       lines do
      #         line 'old_back'
      #       end
      #     end
      #   }

      #   it { subject.must_equal([previous]) }
      # end

      # context 'when there is no content on the previous buffer' do
      #   let(:buffer) { :previous }

      #   it { subject.must_equal([]) }
      # end
    end

  end # Buffer

end # Vedeu