# frozen_string_literal: true

require 'spec_helper'

RSpec.describe EventCollection do
  include DesignManagementTestHelpers

  describe '#to_a' do
    let_it_be(:group) { create(:group) }
    let_it_be(:project) { create(:project_empty_repo, group: group) }
    let_it_be(:projects) { Project.where(id: project.id) }
    let_it_be(:user) { create(:user) }
    let_it_be(:merge_request) { create(:merge_request) }

    before do
      enable_design_management
    end

    context 'with project events' do
      let_it_be(:push_event_payloads) do
        Array.new(9) do
          create(:push_event_payload, event: create(:push_event, project: project, author: user))
        end
      end

      let_it_be(:merge_request_events) { create_list(:event, 10, :merged, project: project, target: merge_request) }
      let_it_be(:closed_issue_event) { create(:closed_issue_event, project: project, author: user) }
      let_it_be(:wiki_page_event) { create(:wiki_page_event, project: project) }
      let_it_be(:design_event) { create(:design_event, project: project) }

      let(:push_events) { push_event_payloads.map(&:event) }

      it 'returns an Array of all event types when no filter is passed', :aggregate_failures do
        most_recent_20_events = [
          wiki_page_event,
          design_event,
          closed_issue_event,
          *push_events,
          *merge_request_events
        ].sort_by(&:id).reverse.take(20)
        events = described_class.new(projects).to_a

        expect(events).to be_an_instance_of(Array)
        expect(events).to match_array(most_recent_20_events)
      end

      it 'includes the wiki page events when using to_a' do
        events = described_class.new(projects).to_a

        expect(events).to include(wiki_page_event)
      end

      it 'includes the design events' do
        collection = described_class.new(projects)

        expect(collection.to_a).to include(design_event)
        expect(collection.all_project_events).to include(design_event)
      end

      it 'includes the wiki page events when using all_project_events' do
        events = described_class.new(projects).all_project_events

        expect(events).to include(wiki_page_event)
      end

      it 'applies a limit to the number of events' do
        events = described_class.new(projects).to_a

        expect(events.length).to eq(20)
      end

      it 'can paginate through events' do
        events = described_class.new(projects, limit: 5, offset: 15).to_a

        expect(events.length).to eq(5)
      end

      it 'returns an empty Array when crossing the maximum page number' do
        events = described_class.new(projects, limit: 1, offset: 15).to_a

        expect(events).to be_empty
      end

      it 'allows filtering of events using an EventFilter, returning single item' do
        filter = EventFilter.new(EventFilter::ISSUE)
        events = described_class.new(projects, filter: filter).to_a

        expect(events).to contain_exactly(closed_issue_event)
      end

      context 'when there are multiple issue events' do
        let!(:work_item_event) do
          create(
            :event,
            :created,
            project: project,
            target: create(:work_item, :task, project: project),
            target_type: 'WorkItem'
          )
        end

        it 'includes work item events too' do
          filter = EventFilter.new(EventFilter::ISSUE)
          events = described_class.new(projects, filter: filter).to_a

          expect(events).to contain_exactly(closed_issue_event, work_item_event)
        end
      end

      it 'allows filtering of events using an EventFilter, returning several items' do
        filter = EventFilter.new(EventFilter::MERGED)
        events = described_class.new(projects, filter: filter).to_a

        expect(events).to match_array(merge_request_events)
      end

      it 'allows filtering of events using an EventFilter, returning pushes' do
        filter = EventFilter.new(EventFilter::PUSH)
        events = described_class.new(projects, filter: filter).to_a

        expect(events).to match_array(push_events)
      end
    end

    context 'with multiple projects' do
      let_it_be(:project_1) { create(:project_empty_repo, name: 'Project Z') }
      let_it_be(:project_1_event) { create(:wiki_page_event, project: project_1) }

      let_it_be(:project_2) { create(:project_empty_repo, name: 'Project A') }
      let_it_be(:project_2_event) { create(:wiki_page_event, project: project_2) }

      context 'when projects param has an order by clause' do
        let_it_be(:projects_sorted_by_name) do
          Project.where(id: [project_1.id, project_2.id]).limit(1).order(:name)
        end

        context 'when preserve_projects_order is true' do
          subject(:events) do
            described_class.new(
              projects_sorted_by_name,
              preserve_projects_order: true
            ).to_a
          end

          it 'returns events from the first project with respect to the order by column' do
            expect(events).to contain_exactly(project_2_event)
          end
        end
      end
    end

    context 'with group events' do
      let(:groups) { group.self_and_descendants.public_or_visible_to_user(user) }
      let(:subject) { described_class.new(projects, groups: groups).to_a }

      it 'includes also group events' do
        subgroup = create(:group, parent: group)
        event1 = create(:event, project: project, author: user)
        event2 = create(:event, project: nil, group: group, author: user)
        event3 = create(:event, project: nil, group: subgroup, author: user)

        expect(subject).to eq([event3, event2, event1])
      end

      it 'does not include events from inaccessible groups' do
        subgroup = create(:group, :private, parent: group)
        event1 = create(:event, project: nil, group: group, author: user)
        create(:event, project: nil, group: subgroup, author: user)

        expect(subject).to match_array([event1])
      end

      context 'with pagination through events' do
        let_it_be(:project_events) { create_list(:event, 10, project: project) }
        let_it_be(:group_events) { create_list(:event, 10, group: group, author: user) }

        let(:subject) { described_class.new(projects, limit: 10, offset: 5, groups: groups).to_a }

        it 'returns recent groups and projects events' do
          recent_events_with_offset = (project_events[5..] + group_events[..4]).reverse

          expect(subject).to eq(recent_events_with_offset)
        end
      end

      context 'with project exclusive event types' do
        using RSpec::Parameterized::TableSyntax

        where(:filter, :event) do
          EventFilter::PUSH | lazy { create(:push_event, project: project) }
          EventFilter::MERGED | lazy { create(:event, :merged, project: project, target: merge_request) }
          EventFilter::TEAM | lazy { create(:event, :joined, project: project) }
          EventFilter::ISSUE | lazy { create(:closed_issue_event, project: project) }
          EventFilter::DESIGNS | lazy { create(:design_event, project: project) }
        end

        with_them do
          let(:subject) do
            described_class.new(projects, groups: Group.where(id: group.id), filter: EventFilter.new(filter))
          end

          it "queries only project events" do
            expected_event = event # Forcing lazy evaluation
            expect(subject).to receive(:project_events).with(no_args).and_call_original
            expect(subject).not_to receive(:group_events)

            expect(subject.to_a).to match_array(expected_event)
          end
        end
      end
    end

    it 'returns no events if no projects are passed' do
      events = described_class.new(Project.none).to_a

      expect(events).to be_empty
    end
  end
end
