# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Banzai::Renderer, feature_category: :markdown do
  let(:renderer) { described_class }

  def fake_object(fresh:)
    object = double('object')

    allow(object).to receive(:respond_to?).with(:cached_markdown_fields).and_return(true)
    allow(object).to receive(:cached_html_up_to_date?).with(:field).and_return(fresh)
    allow(object).to receive(:cached_html_for).with(:field).and_return('field_html')

    object
  end

  def fake_cacheless_object
    object = double('cacheless object')

    allow(object).to receive(:respond_to?).with(:cached_markdown_fields).and_return(false)

    object
  end

  describe '#cache_collection_render' do
    let(:merge_request) { fake_object(fresh: true) }
    let(:context) { { cache_key: [merge_request, 'field'], rendered: merge_request.field_html } }

    context 'when an item has a rendered field' do
      before do
        allow(merge_request).to receive(:field).and_return('This is the field')
        allow(merge_request).to receive(:field_html).and_return('This is the field')
      end

      it 'does not touch redis if the field is in the cache' do
        expect(Rails).not_to receive(:cache)

        described_class.cache_collection_render([{ text: merge_request.field, context: context }])
      end
    end
  end

  describe '#render_field' do
    context 'without cache' do
      let(:commit) { fake_cacheless_object }

      it 'returns cacheless render field' do
        expect(renderer).to receive(:cacheless_render_field).with(commit, :field, {})

        renderer.render_field(commit, :field)
      end
    end

    context 'with cache' do
      subject { renderer.render_field(object, :field) }

      context 'with a stale cache' do
        let(:object) { fake_object(fresh: false) }

        it 'caches and returns the result' do
          expect(object).to receive(:refresh_markdown_cache!)

          is_expected.to eq('field_html')
        end

        it "skips database caching on a GitLab read-only instance" do
          allow(Gitlab::Database).to receive(:read_only?).and_return(true)
          expect(object).to receive(:refresh_markdown_cache!)

          is_expected.to eq('field_html')
        end
      end

      context 'with an up-to-date cache' do
        let(:object) { fake_object(fresh: true) }

        it 'uses the cache' do
          expect(object).not_to receive(:refresh_markdown_cache!)

          is_expected.to eq('field_html')
        end
      end
    end
  end

  describe '#cacheless_render' do
    context 'without cache' do
      let(:object) { fake_object(fresh: false) }

      it 'returns cacheless render field' do
        allow(renderer).to receive(:render_result).and_return(output: 'test')

        expect(renderer).to receive(:render_result).with('test', {})

        renderer.cacheless_render('test')
      end
    end
  end

  describe '#post_process' do
    let(:context_options) { {} }
    let(:html) { 'Consequatur aperiam et nesciunt modi aut assumenda quo id. ' }
    let(:post_processed_html) { double(html_safe: 'safe doc') }
    let(:doc) { double(to_html: post_processed_html) }

    subject { renderer.post_process(html, context_options) }

    context 'when xhtml' do
      let(:context_options) { { xhtml: ' ' } }

      context 'without :post_process_pipeline key' do
        it 'uses PostProcessPipeline' do
          expect(::Banzai::Pipeline::PostProcessPipeline).to receive(:to_document).and_return(doc)

          subject
        end
      end

      context 'with :post_process_pipeline key' do
        let(:context_options) { { post_process_pipeline: Object, xhtml: ' ' } }

        it 'uses passed post process pipeline' do
          expect(Object).to receive(:to_document).and_return(doc)

          subject
        end
      end
    end

    context 'when not xhtml' do
      context 'without :post_process_pipeline key' do
        it 'uses PostProcessPipeline' do
          expect(::Banzai::Pipeline::PostProcessPipeline).to receive(:to_html)
            .with(html, { only_path: true, disable_asset_proxy: true })
            .and_return(post_processed_html)

          subject
        end
      end

      context 'with :post_process_pipeline key' do
        let(:context_options) { { post_process_pipeline: Object } }

        it 'uses passed post process pipeline' do
          expect(Object).to receive(:to_html).and_return(post_processed_html)

          subject
        end
      end
    end
  end

  describe '#full_cache_key' do
    it 'returns nil when no cache_key' do
      expect(described_class.full_cache_key(nil, :full)).to be_nil
    end

    it 'returns a valid full cache key' do
      cache_key = described_class.full_cache_key('my_cache_key', :emoji)
      markdown_version = Gitlab::MarkdownCache.latest_cached_markdown_version(local_version: nil)

      expect(cache_key).to eq ["banzai", "my_cache_key", :emoji, markdown_version]
    end

    it 'pipeline name defaults to :full' do
      cache_key = described_class.full_cache_key('my_cache_key', nil)
      markdown_version = Gitlab::MarkdownCache.latest_cached_markdown_version(local_version: nil)

      expect(cache_key).to eq ["banzai", "my_cache_key", :full, markdown_version]
    end
  end

  describe 'instrumentation in render_result' do
    let(:subscription_name) { "call_filter.html_pipeline_#{Thread.current.object_id}" }

    it 'calculates pipeline timing' do
      expect(ActiveSupport::Notifications).to receive(:monotonic_subscribe).with(subscription_name)
                                                                           .and_call_original.at_least(:once)
      expect(ActiveSupport::Notifications).to receive(:unsubscribe).and_call_original.at_least(:once)
      expect(Rainbow).not_to receive(:new)

      result = renderer.render_result('test', pipeline: :plain_markdown, project: nil)

      expect(result[:pipeline_timing]).not_to be_nil
    end

    it 'enables debug output' do
      expect(ActiveSupport::Notifications).to receive(:monotonic_subscribe).with(subscription_name)
                                                                           .and_call_original.at_least(:once)
      expect(ActiveSupport::Notifications).to receive(:unsubscribe).and_call_original.at_least(:once)
      expect(Rainbow).to receive(:new).and_call_original.at_least(:once)
      expect(described_class).to receive(:color_for_duration).and_call_original.at_least(:twice)

      renderer.render_result('test', pipeline: :plain_markdown, project: nil, debug: true)
    end

    it 'enables debug_timing output' do
      expect(ActiveSupport::Notifications).to receive(:monotonic_subscribe).with(subscription_name)
                                                                           .and_call_original.at_least(:once)
      expect(ActiveSupport::Notifications).to receive(:unsubscribe).and_call_original.at_least(:once)
      expect(Rainbow).to receive(:new).and_call_original.at_least(:once)
      expect(described_class).to receive(:color_for_duration).and_call_original.at_least(:twice)

      renderer.render_result('test', pipeline: :plain_markdown, project: nil, debug_timing: true)
    end

    it 'generates a color for the duration' do
      expect(described_class.color_for_duration(0.5)).to eq :green
      expect(described_class.color_for_duration(1.5)).to eq :orange
      expect(described_class.color_for_duration(2.5)).to eq :red
    end

    it 'formats duration' do
      expect(described_class.formatted_duration(0.5)).to eq '0.500000_s'
      expect(described_class.formatted_duration(1.5)).to eq '1.500000_s'
      expect(described_class.formatted_duration(2.5)).to eq '2.500000_s'
    end
  end
end
