require 'spec_helper'
require 'html/pipeline'

describe Banzai::Filter::LabelReferenceFilter, lib: true do
  include FilterSpecHelper

  let(:project)   { create(:empty_project, :public) }
  let(:label)     { create(:label, project: project) }
  let(:reference) { label.to_reference }

  it 'requires project context' do
    expect { described_class.call('') }.to raise_error(ArgumentError, /:project/)
  end

  %w(pre code a style).each do |elem|
    it "ignores valid references contained inside '#{elem}' element" do
      exp = act = "<#{elem}>Label #{reference}</#{elem}>"
      expect(reference_filter(act).to_html).to eq exp
    end
  end

  it 'includes default classes' do
    doc = reference_filter("Label #{reference}")
    expect(doc.css('a').first.attr('class')).to eq 'gfm gfm-label'
  end

  it 'includes a data-project attribute' do
    doc = reference_filter("Label #{reference}")
    link = doc.css('a').first

    expect(link).to have_attribute('data-project')
    expect(link.attr('data-project')).to eq project.id.to_s
  end

  it 'includes a data-label attribute' do
    doc = reference_filter("See #{reference}")
    link = doc.css('a').first

    expect(link).to have_attribute('data-label')
    expect(link.attr('data-label')).to eq label.id.to_s
  end

  it 'supports an :only_path context' do
    doc = reference_filter("Label #{reference}", only_path: true)
    link = doc.css('a').first.attr('href')

    expect(link).not_to match %r(https?://)
    expect(link).to eq urls.namespace_project_issues_path(project.namespace, project, label_name: label.name)
  end

  it 'adds to the results hash' do
    result = reference_pipeline_result("Label #{reference}")
    expect(result[:references][:label]).to eq [label]
  end

  describe 'label span element' do
    it 'includes default classes' do
      doc = reference_filter("Label #{reference}")
      expect(doc.css('a span').first.attr('class')).to eq 'label color-label'
    end

    it 'includes a style attribute' do
      doc = reference_filter("Label #{reference}")
      expect(doc.css('a span').first.attr('style')).to match(/\Abackground-color: #\h{6}; color: #\h{6}\z/)
    end
  end

  context 'Integer-based references' do
    it 'links to a valid reference' do
      doc = reference_filter("See #{reference}")

      expect(doc.css('a').first.attr('href')).to eq urls.
        namespace_project_issues_url(project.namespace, project, label_name: label.name)
    end

    it 'links with adjacent text' do
      doc = reference_filter("Label (#{reference}.)")
      expect(doc.to_html).to match(%r(\(<a.+><span.+>#{label.name}</span></a>\.\)))
    end

    it 'ignores invalid label IDs' do
      exp = act = "Label #{invalidate_reference(reference)}"

      expect(reference_filter(act).to_html).to eq exp
    end
  end

  context 'String-based single-word references' do
    let(:label)     { create(:label, name: 'gfm', project: project) }
    let(:reference) { "#{Label.reference_prefix}#{label.name}" }

    it 'links to a valid reference' do
      doc = reference_filter("See #{reference}")

      expect(doc.css('a').first.attr('href')).to eq urls.
        namespace_project_issues_url(project.namespace, project, label_name: label.name)
      expect(doc.text).to eq 'See gfm'
    end

    it 'links with adjacent text' do
      doc = reference_filter("Label (#{reference}.)")
      expect(doc.to_html).to match(%r(\(<a.+><span.+>#{label.name}</span></a>\.\)))
    end

    it 'ignores invalid label names' do
      exp = act = "Label #{Label.reference_prefix}#{label.name.reverse}"

      expect(reference_filter(act).to_html).to eq exp
    end
  end

  context 'String-based multi-word references in quotes' do
    let(:label)     { create(:label, name: 'gfm references', project: project) }
    let(:reference) { label.to_reference(:name) }

    it 'links to a valid reference' do
      doc = reference_filter("See #{reference}")

      expect(doc.css('a').first.attr('href')).to eq urls.
        namespace_project_issues_url(project.namespace, project, label_name: label.name)
      expect(doc.text).to eq 'See gfm references'
    end

    it 'links with adjacent text' do
      doc = reference_filter("Label (#{reference}.)")
      expect(doc.to_html).to match(%r(\(<a.+><span.+>#{label.name}</span></a>\.\)))
    end

    it 'ignores invalid label names' do
      exp = act = %(Label #{Label.reference_prefix}"#{label.name.reverse}")

      expect(reference_filter(act).to_html).to eq exp
    end
  end

  describe 'edge cases' do
    it 'gracefully handles non-references matching the pattern' do
      exp = act = '(format nil "~0f" 3.0) ; 3.0'
      expect(reference_filter(act).to_html).to eq exp
    end
  end

  describe 'referencing a label in a link href' do
    let(:reference) { %Q{<a href="#{label.to_reference}">Label</a>} }

    it 'links to a valid reference' do
      doc = reference_filter("See #{reference}")

      expect(doc.css('a').first.attr('href')).to eq urls.
        namespace_project_issues_url(project.namespace, project, label_name: label.name)
    end

    it 'links with adjacent text' do
      doc = reference_filter("Label (#{reference}.)")
      expect(doc.to_html).to match(%r(\(<a.+>Label</a>\.\)))
    end

    it 'includes a data-project attribute' do
      doc = reference_filter("Label #{reference}")
      link = doc.css('a').first

      expect(link).to have_attribute('data-project')
      expect(link.attr('data-project')).to eq project.id.to_s
    end

    it 'includes a data-label attribute' do
      doc = reference_filter("See #{reference}")
      link = doc.css('a').first

      expect(link).to have_attribute('data-label')
      expect(link.attr('data-label')).to eq label.id.to_s
    end

    it 'adds to the results hash' do
      result = reference_pipeline_result("Label #{reference}")
      expect(result[:references][:label]).to eq [label]
    end
  end
end
