# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Labels::TransferService do
  shared_examples 'transfer labels' do
    describe '#execute' do
      let_it_be(:user) { create(:user) }

      let_it_be(:old_group_ancestor) { create(:group) }
      let_it_be(:old_group) { create(:group, parent: old_group_ancestor) }

      let_it_be(:new_group) { create(:group) }

      let_it_be(:project) { create(:project, :repository, group: new_group) }

      subject(:service) { described_class.new(user, old_group, project) }

      before do
        old_group_ancestor.add_developer(user)
        new_group.add_developer(user)
      end

      it 'recreates missing group labels at project level and assigns them to the issuables' do
        old_group_label_1 = create(:group_label, group: old_group)
        old_group_label_2 = create(:group_label, group: old_group)

        labeled_issue = create(:labeled_issue, project: project, labels: [old_group_label_1])
        labeled_merge_request = create(:labeled_merge_request, source_project: project, labels: [old_group_label_2])

        expect { service.execute }.to change(project.labels, :count).by(2)
        expect(labeled_issue.reload.labels).to contain_exactly(project.labels.find_by_title(old_group_label_1.title))
        expect(labeled_merge_request.reload.labels).to contain_exactly(project.labels.find_by_title(old_group_label_2.title))
      end

      it 'recreates missing ancestor group labels at project level and assigns them to the issuables' do
        old_group_ancestor_label_1 = create(:group_label, group: old_group_ancestor)
        old_group_ancestor_label_2 = create(:group_label, group: old_group_ancestor)

        labeled_issue = create(:labeled_issue, project: project, labels: [old_group_ancestor_label_1])
        labeled_merge_request = create(:labeled_merge_request, source_project: project, labels: [old_group_ancestor_label_2])

        expect { service.execute }.to change(project.labels, :count).by(2)
        expect(labeled_issue.reload.labels).to contain_exactly(project.labels.find_by_title(old_group_ancestor_label_1.title))
        expect(labeled_merge_request.reload.labels).to contain_exactly(project.labels.find_by_title(old_group_ancestor_label_2.title))
      end

      it 'recreates label priorities related to the missing group labels' do
        old_group_label = create(:group_label, group: old_group)
        create(:labeled_issue, project: project, labels: [old_group_label])
        create(:label_priority, project: project, label: old_group_label, priority: 1)

        service.execute

        new_project_label = project.labels.find_by(title: old_group_label.title)
        expect(new_project_label.id).not_to eq old_group_label.id
        expect(new_project_label.priorities).not_to be_empty
      end

      it 'does not recreate missing group labels that are not applied to issues or merge requests' do
        old_group_label = create(:group_label, group: old_group)

        service.execute

        expect(project.labels.where(title: old_group_label.title)).to be_empty
      end

      it 'does not recreate missing group labels that already exist in the project group' do
        old_group_label = create(:group_label, group: old_group)
        labeled_issue = create(:labeled_issue, project: project, labels: [old_group_label])

        new_group_label = create(:group_label, group: new_group, title: old_group_label.title)

        service.execute

        expect(project.labels.where(title: old_group_label.title)).to be_empty
        expect(labeled_issue.reload.labels).to contain_exactly(new_group_label)
      end

      it 'updates only label links in the given project' do
        old_group_label = create(:group_label, group: old_group)
        other_project = create(:project, group: old_group)

        labeled_issue = create(:labeled_issue, project: project, labels: [old_group_label])
        other_project_labeled_issue = create(:labeled_issue, project: other_project, labels: [old_group_label])

        service.execute

        expect(labeled_issue.reload.labels).not_to include(old_group_label)
        expect(other_project_labeled_issue.reload.labels).to contain_exactly(old_group_label)
      end

      context 'when moving within the same ancestor group' do
        let(:other_subgroup) { create(:group, parent: old_group_ancestor) }
        let(:project) { create(:project, :repository, group: other_subgroup) }

        it 'does not recreate ancestor group labels' do
          old_group_ancestor_label_1 = create(:group_label, group: old_group_ancestor)
          old_group_ancestor_label_2 = create(:group_label, group: old_group_ancestor)

          labeled_issue = create(:labeled_issue, project: project, labels: [old_group_ancestor_label_1])
          labeled_merge_request = create(:labeled_merge_request, source_project: project, labels: [old_group_ancestor_label_2])

          expect { service.execute }.not_to change(project.labels, :count)
          expect(labeled_issue.reload.labels).to contain_exactly(old_group_ancestor_label_1)
          expect(labeled_merge_request.reload.labels).to contain_exactly(old_group_ancestor_label_2)
        end
      end
    end
  end

  it_behaves_like 'transfer labels'
end