# frozen_string_literal: true

require 'spec_helper'

RSpec.describe TodosFinder do
  describe '#execute' do
    let_it_be(:user) { create(:user) }
    let_it_be(:group) { create(:group) }
    let_it_be(:project) { create(:project, :repository, namespace: group) }
    let_it_be(:issue) { create(:issue, project: project) }
    let_it_be(:merge_request) { create(:merge_request, source_project: project) }

    let(:finder) { described_class }

    before_all do
      group.add_developer(user)
    end

    describe '#execute' do
      it 'returns no todos if user is nil' do
        expect(described_class.new(nil, {}).execute).to be_empty
      end

      context 'filtering' do
        let!(:todo1) { create(:todo, user: user, project: project, target: issue) }
        let!(:todo2) { create(:todo, user: user, group: group, target: merge_request) }

        it 'returns correct todos when filtered by a project' do
          todos = finder.new(user, { project_id: project.id }).execute

          expect(todos).to match_array([todo1])
        end

        it 'returns correct todos when filtered by a group' do
          todos = finder.new(user, { group_id: group.id }).execute

          expect(todos).to match_array([todo1, todo2])
        end

        context 'when filtering by type' do
          it 'returns todos by type when filtered by a single type' do
            todos = finder.new(user, { type: 'Issue' }).execute

            expect(todos).to match_array([todo1])
          end

          it 'returns todos by type when filtered by multiple types' do
            design_todo = create(:todo, user: user, group: group, target: create(:design))

            todos = finder.new(user, { type: %w[Issue MergeRequest] }).execute

            expect(todos).to contain_exactly(todo1, todo2)
            expect(todos).not_to include(design_todo)
          end

          it 'returns all todos when type is nil' do
            todos = finder.new(user, { type: nil }).execute

            expect(todos).to contain_exactly(todo1, todo2)
          end

          it 'returns all todos when type is an empty collection' do
            todos = finder.new(user, { type: [] }).execute

            expect(todos).to contain_exactly(todo1, todo2)
          end

          it 'returns all todos when type is blank' do
            todos = finder.new(user, { type: '' }).execute

            expect(todos).to contain_exactly(todo1, todo2)
          end

          it 'returns todos by type when blank type is in type collection' do
            todos = finder.new(user, { type: ['', 'MergeRequest'] }).execute

            expect(todos).to contain_exactly(todo2)
          end

          it 'returns todos of all types when only blanks are in a collection' do
            todos = finder.new(user, { type: ['', ''] }).execute

            expect(todos).to contain_exactly(todo1, todo2)
          end

          it 'returns all todos when no type param' do
            todos = finder.new(user).execute

            expect(todos).to contain_exactly(todo1, todo2)
          end

          it 'raises an argument error when invalid type is passed' do
            todos_finder = finder.new(user, { type: %w[Issue MergeRequest NotAValidType] })

            expect { todos_finder.execute }.to raise_error(ArgumentError)
          end
        end

        context 'when filtering for actions' do
          let!(:todo1) { create(:todo, user: user, project: project, target: issue, action: Todo::ASSIGNED) }
          let!(:todo2) { create(:todo, user: user, group: group, target: merge_request, action: Todo::DIRECTLY_ADDRESSED) }

          context 'by action ids' do
            it 'returns the expected todos' do
              todos = finder.new(user, { action_id: Todo::DIRECTLY_ADDRESSED }).execute

              expect(todos).to match_array([todo2])
            end

            it 'returns the expected todos when filtering for multiple action ids' do
              todos = finder.new(user, { action_id: [Todo::DIRECTLY_ADDRESSED, Todo::ASSIGNED] }).execute

              expect(todos).to match_array([todo2, todo1])
            end
          end

          context 'by action names' do
            it 'returns the expected todos' do
              todos = finder.new(user, { action: :directly_addressed }).execute

              expect(todos).to match_array([todo2])
            end

            it 'returns the expected todos when filtering for multiple action names' do
              todos = finder.new(user, { action: [:directly_addressed, :assigned] }).execute

              expect(todos).to match_array([todo2, todo1])
            end
          end
        end

        context 'when filtering by author' do
          let_it_be(:author1) { create(:user) }
          let_it_be(:author2) { create(:user) }

          let!(:todo1) { create(:todo, user: user, author: author1) }
          let!(:todo2) { create(:todo, user: user, author: author2) }

          it 'returns correct todos when filtering by an author' do
            todos = finder.new(user, { author_id: author1.id }).execute

            expect(todos).to match_array([todo1])
          end

          context 'querying for multiple authors' do
            it 'returns the correct todo items' do
              todos = finder.new(user, { author_id: [author2.id, author1.id] }).execute

              expect(todos).to match_array([todo2, todo1])
            end
          end
        end

        context 'by groups' do
          context 'with subgroups' do
            let_it_be(:subgroup) { create(:group, parent: group) }

            let!(:todo3) { create(:todo, user: user, group: subgroup, target: issue) }

            it 'returns todos from subgroups when filtered by a group' do
              todos = finder.new(user, { group_id: group.id }).execute

              expect(todos).to match_array([todo1, todo2, todo3])
            end
          end

          context 'filtering for multiple groups' do
            let_it_be(:group2) { create(:group) }
            let_it_be(:group3) { create(:group) }
            let_it_be(:subgroup1) { create(:group, parent: group) }
            let_it_be(:subgroup2) { create(:group, parent: group2) }

            let!(:todo1) { create(:todo, user: user, project: project, target: issue) }
            let!(:todo2) { create(:todo, user: user, group: group, target: merge_request) }
            let!(:todo3) { create(:todo, user: user, group: group2, target: merge_request) }
            let!(:todo4) { create(:todo, user: user, group: subgroup1, target: issue) }
            let!(:todo5) { create(:todo, user: user, group: subgroup2, target: issue) }
            let!(:todo6) { create(:todo, user: user, group: group3, target: issue) }

            it 'returns the expected groups' do
              todos = finder.new(user, { group_id: [group.id, group2.id] }).execute

              expect(todos).to match_array([todo1, todo2, todo3, todo4, todo5])
            end
          end
        end

        context 'by state' do
          let!(:todo1) { create(:todo, user: user, group: group, target: issue, state: :done) }
          let!(:todo2) { create(:todo, user: user, group: group, target: issue, state: :pending) }

          it 'returns the expected items when no state is provided' do
            todos = finder.new(user, {}).execute

            expect(todos).to match_array([todo2])
          end

          it 'returns the expected items when a state is provided' do
            todos = finder.new(user, { state: :done }).execute

            expect(todos).to match_array([todo1])
          end

          it 'returns the expected items when multiple states are provided' do
            todos = finder.new(user, { state: [:pending, :done] }).execute

            expect(todos).to match_array([todo1, todo2])
          end
        end

        context 'by project' do
          let_it_be(:project1) { create(:project) }
          let_it_be(:project2) { create(:project) }
          let_it_be(:project3) { create(:project) }

          let!(:todo1) { create(:todo, user: user, project: project1, state: :pending) }
          let!(:todo2) { create(:todo, user: user, project: project2, state: :pending) }
          let!(:todo3) { create(:todo, user: user, project: project3, state: :pending) }

          it 'returns the expected todos for one project' do
            todos = finder.new(user, { project_id: project2.id }).execute

            expect(todos).to match_array([todo2])
          end

          it 'returns the expected todos for many projects' do
            todos = finder.new(user, { project_id: [project2.id, project1.id] }).execute

            expect(todos).to match_array([todo2, todo1])
          end
        end

        context 'when filtering by target id' do
          it 'returns the expected todos for the target' do
            todos = finder.new(user, { type: 'Issue', target_id: issue.id }).execute

            expect(todos).to match_array([todo1])
          end

          it 'returns the expected todos for multiple target ids' do
            another_issue = create(:issue, project: project)
            todo3 = create(:todo, user: user, project: project, target: another_issue)

            todos = finder.new(user, { type: 'Issue', target_id: [issue.id, another_issue.id] }).execute

            expect(todos).to match_array([todo1, todo3])
          end

          it 'returns the expected todos for empty target id collection' do
            todos = finder.new(user, { target_id: [] }).execute

            expect(todos).to match_array([todo1, todo2])
          end
        end
      end

      context 'external authorization' do
        it_behaves_like 'a finder with external authorization service' do
          let!(:subject) { create(:todo, project: project, user: user) }
          let(:project_params) { { project_id: project.id } }
        end
      end
    end

    describe '#sort' do
      context 'by date' do
        let!(:todo1) { create(:todo, user: user, project: project) }
        let!(:todo2) { create(:todo, user: user, project: project) }
        let!(:todo3) { create(:todo, user: user, project: project) }

        it 'sorts with oldest created first' do
          todos = finder.new(user, { sort: 'id_asc' }).execute

          expect(todos.first).to eq(todo1)
          expect(todos.second).to eq(todo2)
          expect(todos.third).to eq(todo3)
        end

        it 'sorts with newest created first' do
          todos = finder.new(user, { sort: 'id_desc' }).execute

          expect(todos.first).to eq(todo3)
          expect(todos.second).to eq(todo2)
          expect(todos.third).to eq(todo1)
        end
      end

      it "sorts by priority" do
        project_2 = create(:project)

        label_1         = create(:label, title: 'label_1', project: project, priority: 1)
        label_2         = create(:label, title: 'label_2', project: project, priority: 2)
        label_3         = create(:label, title: 'label_3', project: project, priority: 3)
        label_1_2       = create(:label, title: 'label_1', project: project_2, priority: 1)

        issue_1         = create(:issue, title: 'issue_1', project: project)
        issue_2         = create(:issue, title: 'issue_2', project: project)
        issue_3         = create(:issue, title: 'issue_3', project: project)
        issue_4         = create(:issue, title: 'issue_4', project: project)
        merge_request_1 = create(:merge_request, source_project: project_2)

        merge_request_1.labels << label_1_2

        # Covers the case where Todo has more than one label
        issue_3.labels         << label_1
        issue_3.labels         << label_3

        issue_2.labels         << label_3
        issue_1.labels         << label_2

        todo_1 = create(:todo, user: user, project: project, target: issue_4)
        todo_2 = create(:todo, user: user, project: project, target: issue_2)
        todo_3 = create(:todo, user: user, project: project, target: issue_3, created_at: 2.hours.ago)
        todo_4 = create(:todo, user: user, project: project, target: issue_1)
        todo_5 = create(:todo, user: user, project: project_2, target: merge_request_1, created_at: 1.hour.ago)

        project_2.add_developer(user)

        todos = finder.new(user, { sort: 'priority' }).execute

        expect(todos).to eq([todo_3, todo_5, todo_4, todo_2, todo_1])
      end
    end
  end

  describe '.todo_types' do
    it 'returns the expected types' do
      expected_result =
        if Gitlab.ee?
          %w[Epic Issue MergeRequest DesignManagement::Design AlertManagement::Alert]
        else
          %w[Issue MergeRequest DesignManagement::Design AlertManagement::Alert]
        end

      expect(described_class.todo_types).to contain_exactly(*expected_result)
    end
  end

  describe '#any_for_target?' do
    it 'returns true if there are any todos for the given target' do
      todo = create(:todo, :pending)
      finder = described_class.new(todo.user)

      expect(finder.any_for_target?(todo.target)).to eq(true)
    end

    it 'returns false if there are no todos for the given target' do
      issue = create(:issue)
      finder = described_class.new(issue.author)

      expect(finder.any_for_target?(issue)).to eq(false)
    end
  end
end