require 'spec_helper'

describe Banzai::ReferenceParser::IssueParser do
  include ReferenceParserHelpers

  let(:project) { create(:project, :public) }
  let(:user)    { create(:user) }
  let(:issue)   { create(:issue, project: project) }
  let(:link)    { empty_html_link }
  subject       { described_class.new(Banzai::RenderContext.new(project, user)) }

  describe '#nodes_visible_to_user' do
    context 'when the link has a data-issue attribute' do
      before do
        link['data-issue'] = issue.id.to_s
      end

      it_behaves_like "referenced feature visibility", "issues"

      it 'returns the nodes when the user can read the issue' do
        expect(Ability).to receive(:issues_readable_by_user)
                             .with([issue], user)
                             .and_return([issue])

        expect(subject.nodes_visible_to_user(user, [link])).to eq([link])
      end

      it 'returns an empty Array when the user can not read the issue' do
        expect(Ability).to receive(:issues_readable_by_user)
                             .with([issue], user)
                             .and_return([])

        expect(subject.nodes_visible_to_user(user, [link])).to eq([])
      end

      context 'when the user cannot read cross project' do
        let(:issue) { create(:issue) }

        before do
          allow(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
          allow(Ability).to receive(:allowed?).with(user, :read_cross_project, :global) { false }
        end

        it 'returns the nodes when the user can read the issue' do
          expect(Ability).to receive(:allowed?)
                               .with(user, :read_issue_iid, issue)
                               .and_return(true)

          expect(subject.nodes_visible_to_user(user, [link])).to eq([link])
        end

        it 'returns an empty Array when the user can not read the issue' do
          expect(Ability).to receive(:allowed?)
                               .with(user, :read_issue_iid, issue)
                               .and_return(false)

          expect(subject.nodes_visible_to_user(user, [link])).to eq([])
        end

        context 'when the issue is not cross project' do
          let(:issue) { create(:issue, project: project) }

          it 'does not check `can_read_reference` if the issue is not cross project' do
            expect(Ability).to receive(:issues_readable_by_user)
                                 .with([issue], user)
                                 .and_return([])

            expect(subject).not_to receive(:can_read_reference?).with(user, issue)

            expect(subject.nodes_visible_to_user(user, [link])).to eq([])
          end
        end
      end
    end

    context 'when the link does not have a data-issue attribute' do
      it 'returns an empty Array' do
        expect(subject.nodes_visible_to_user(user, [link])).to eq([])
      end
    end
  end

  describe '#referenced_by' do
    context 'when the link has a data-issue attribute' do
      context 'using an existing issue ID' do
        before do
          link['data-issue'] = issue.id.to_s
        end

        it 'returns an Array of issues' do
          expect(subject.referenced_by([link])).to eq([issue])
        end

        it 'returns an empty Array when the list of nodes is empty' do
          expect(subject.referenced_by([link])).to eq([issue])
          expect(subject.referenced_by([])).to eq([])
        end
      end

      context 'when issue with given ID does not exist' do
        before do
          link['data-issue'] = '-1'
        end

        it 'returns an empty Array' do
          expect(subject.referenced_by([link])).to eq([])
        end
      end
    end
  end

  describe '#records_for_nodes' do
    it 'returns a Hash containing the issues for a list of nodes' do
      link['data-issue'] = issue.id.to_s
      nodes = [link]

      expect(subject.records_for_nodes(nodes)).to eq({ link => issue })
    end
  end

  context 'when checking multiple merge requests on another project' do
    let(:other_project) { create(:project, :public) }
    let(:other_issue) { create(:issue, project: other_project) }

    let(:control_links) do
      [issue_link(other_issue)]
    end

    let(:actual_links) do
      control_links + [issue_link(create(:issue, project: other_project))]
    end

    def issue_link(issue)
      Nokogiri::HTML.fragment(%Q{<a data-issue="#{issue.id}"></a>}).children[0]
    end

    before do
      project.add_developer(user)
    end

    it_behaves_like 'no N+1 queries'
  end
end
